Primary DNS servers are sometimes called preferred DNS servers and secondary DNS servers sometimes alternate DNS servers. A DNS server has a very powerful function in network topology. I have roughly 6 dns servers for 3 sites. Once the IP address conversion is done, the websites files and resources are loaded … 1.3. Alternate DNS server. DNS servers in Czech Republic. Lolku, co to meleš o O2 DNS serverech :-D :-D :-D Podívej se na mojí část IP, pak na svojí část IP a vsadím boty, že seš u Nextry tedy pardón dnes GTS Novery přes bývalou platformu Telenor - tedy dnes GTS Novera. 2a00:aa40:0:225::2 ns.oberberg-online.de. dig : dig is a tool that is used for querying DNS nameservers for information about host addresses, mail exchanges, nameservers, and related information. What it basically does is translating domain names into machine readable IP addresses. Verizon DNS servers are often listed elsewhere as 4.2.2.1, 4.2.2.2, 4.2.2.3, 4.2.2.4, and/or 4.2.2.5, but those are actually alternatives to the CenturyLink/Level 3 DNS server addresses shown in the table above. As per the above, priority is given to 10.0.80.11 and only if it is unable to retrieve the relevant information, details are passed to 10.0.80.12 to perform a DNS query. Therefore DNS server details can be viewed as below by using it. for an example, in an Ubuntu machine Terminal can be opened by searching for it on the Search bar, 1.4 Then type 'ip r | grep default' on the Terminal to view Network details. Je to údaj, pomocí kterého DNS server překládá ve směru IP adresa -> doménové jméno. Google Public DNS. Many people complain that their ISP-maintained DNS servers are sluggish and contribute to a slower overall browsing experience. IP Location lookup tool provides you information about a person's real IP address location. Quad9. The offer two sets of free public DNS servers, one of which is just for parental controls with dozens of filtering options. All the provided DNS servers are public DNS servers and not in any way affiliated with DNSchecker.org. Read how to change your DNS server … Why DNS server is crucial and DNS priority works? Quad9 also has an unsecured IPv4 public DNS at 9.9.9.10 (2620:fe::10 for IPv6). I had kind of figured out that the router acts as the DNS server for my IP phone before reading this page, but it was great to hear such a thoughtful explanation. Secondary DNS: 87.194.0.52. Verizon, like most ISPs, prefers to balance their DNS server traffic via local, automatic assignments. An easy way to test for a DNS server issue is by typing a website's IP address into the browser. Google Public DNS promises three core benefits: a faster browsing experience, improved security, and accurate results without redirects. A MikroTik router with DNS feature enabled can be set as a DNS server for any DNS-compliant client. After reading the DNS server IP address parameters, I take the output through several tests to ensure that it is not empty (because it is quite possible that we configured static IP addresses and left the DNS server fields empty, either intentionally or by mistake) and to determine whether just one DNS server IP is configured. The company also offers DNS servers that block adult content, called OpenDNS FamilyShield: 208.67.222.123 and 208.67.220.123 (shown here). Slouží k ověření autentičnosti IP adresy. Na komputerach, we właściwościach TCP/IP ustaw automatyczne pobieranie adresu IP i DNS, wyczyść bufor DNS poleceniem w wierszu poleceń. While some websites can be accessed using their IP addresses, it is a lot easier for a human to memorize words instead of numbers, hence the use of the domain names. Download all 13 valid servers: This list of public and free DNS servers is checked continuously. Chris Selph is a CompTIA-certified technology and vocational IT teacher. In this video, we will tell you guys how to fix the internet problem that Server IP Address Could Not Be Found. If, on the other hand, you want to use the DNS servers that your specific ISP, like Verizon, AT&T, Comcast/XFINITY, etc., has determined is best, then don't manually set DNS server addresses at all—just let them auto assign. Each machine, which is connected to the Internet, has its own IP address. In order to take a packet dump of the current network traffic, tcpdump command can be used. Currently there are 1,809 Nameservers from 128 countries in the database. Default IP Address: 192.164.1.254 Default … Default IP Address: 192.164.1.254 Default … The basic set of DNS servers are called the "Default" servers, and block not only ads but also malware and phishing websites: There are also "Family protection" servers (94.140.14.15 and 2a10:50c0::bad1:ff) that block adult content plus everything included in the "Default" servers. There are lots of reasons you might want to try alternative ones (we get into many of them in Why Use Different DNS Servers? OpenNIC has several DNS servers. You can sign up for free from their signup page. Be sure that the DNS server is not configured to notify itself: Select the primary zone, click DNS, and then click Properties from the menu. Advantages: Ensures that DNS queries originating from the Domain Controller will be resolved locally if possible. DNS is the acronym for Domain Name System. Following is the list of all DNS servers of United Kingdom available in our database. DNS 1 DNS 2 web UPC : 213.46.172.36 : 213.46.172.37 : www.upc.cz O2 : 160.218.161.54 : 194.228.41.65 : www.o2.cz Now, in the Internet Protocol Version 4 (TCIP/IPv4) Properties, select the radio button next to Use the following DNS server addresses. Quad9 has free public DNS servers that protect your computer and other devices from cyber threats by immediately and automatically blocking access to unsafe websites, without storing your personal data. For example, the primary Verizon DNS server in Atlanta, GA, is 68.238.120.12 and in Chicago, is 68.238.0.12. Say hello to ipconfig /all command 10.0.80.11 is our own dns server located inside our corporate network. Primary DNS server: 87.194.255.154: A simple guide to setting up your static IP address is enclosed. A premium DNS offering is available, too, called OpenDNS VIP. Using NSLookup on this server, I get an old/incorrect SOA record returned as well as old A … When the remote requests are enabled, the MikroTik router responds to TCP and UDP DNS requests on port 53. 2a02:2970:1002::18 dns2.digitalcourage.de. Therefore a new concept named Domain Names were introduced as a solution for this. Each domain name maps to an IP address. Configure the Preferred DNS server in TCP/IP properties on each Domain Controller to use itself as Primary DNS Server. They are simple and easy to remember as they are alphabetical characters. Step3. Launched in December 2009, the Google Public DNS aims to make the internet more reliable and secure. I've been having problems over the last 36 hours or so with the O2 DNS server and I am on the computer at my job. 8 Linux host Commands - Options for DNS Lookup, How to Use Linux Dig Command to Query DNS, 14 tcpdump Commands to Capture Network Traffic in Linux, A Brief Outline of 106 Linux Commands with Examples, How to Configure Static IP Address on Ubuntu 18.04, How to Easy Install Nagios using FAN Tool, How to Install Chef Workstation/Server/Node on CentOS 7. CleanBrowsing has three free public DNS server options: a security filter, adult filter, and family filter. This is usually supplied to you by your ISP (Internet Service Provider). 1. Reply. How to Add a SRV Record to Your Minecraft Server dns server IP address assigned by your ISP or network admin. Alternate DNS is a free public DNS service that blocks ads before they reach your network. He writes troubleshooting content and is the General Manager of Lifewire. DNS servers must not use dynamically assigned IP addresses because a dynamic change of address could cause clients to lose contact with the DNS server. Např. Their new DNS server, the “1.1.1.1” is one of the fastest and privacy-first DNS servers available on the web. Still I have one nagging question. Verisign's public DNS services are centered around stability and security with 100% up-time, as well as privacy, citing that they "will not sell your public DNS data to third parties nor redirect your queries to serve you any ads.". More features can be had at a price: CleanBrowsing Plans. He also serves as network & server administrator and performs computer maintenance and repair for numerous clients. (see below) You can Check what IP address and what DNS address you have been assigned by typing ipconfig/all at the command line. 4, and change X.X.X.X with the IP address of the DNS server … Once the IP address conversion is done, the websites files and resources are loaded … How to Setup and Configure Dynamic DNS (DDNS) in an ASUS Router How to Setup and Configure Dynamic DNS (DDNS) in a TP-Link Router Geek Terms How to Run a Trace Route on Windows, MAC or Linux DNS Host Types and Features How Do I Flush Mac DNS Cache? Click Properties. This is widely used be Linux users for network troubleshooting purposes. You still need an ISP to connect to for access—DNS servers just translate between IP addresses and domain names so that you can access websites with a human-readable name instead of a difficult-to-remember IP address. DNS (Domain Name System) is a system which translates the domain names you enter in a browser to the IP addresses required to access those sites, and the best DNS servers … The name of this public DNS server resembles its IP address, i.e., 9.9.9.9. or if this just wont work with a static IP? However, the online method is slightly erroneous and wouldn’t provide you correct local DNS server IP. As you can see, 192.168.8.1 is the DNS address as per the above output. how do i update the script to add new ip server dns, please help me, thanks a lot Nik. 10.0.80.11 is our own dns server located inside our corporate network. Let’s take an example with your net banking website. DNS (Domain Name System) is a fundamental facilitator of several networking technologies such as mail servers, Internet browsing, and streaming services e.g. 167.233.5.204 dns-two-backup.sicher-surfen.de. As per the above output, 10.0.10.11 is the IP address of the DNS server. In case you use third-party DNS providers like Cloudflare DNS or OpenDNS server, you can visit their sites to check your DNS server. Cisco IOS image builds a cache table of hostname-to-address mappings. This video shows you how to use windows Telnet Client to check which DNS severs are being used by your O2 Wireless Box 2. This command provides you with DNS lookup details. "www.example.com" is an example for a domain name. IP Address Location AS Number Software / Version Checked Status Reliability Whois; 217.75.213.19 u217-75-213-19.static.grape.cz. Public DNS Server List. Mention the domain name in my case getlabsdone.local, in your network you have to mention your own DNS domain name ip domain name getlabsdone.local Step4. http://www.o2.co.uk. For IPv6-only: you can use Google Public DNS64 instead of the IPv6 addresses in the previous point. Technically you are typing the domain name of the bank website (onlinesbi.com) in the web browser but to complete the request and load the webpage, the domain name must be converted to its IP address. View all United Kingdom’s DNS Servers. DNS servers are referred to as all sorts of names, like DNS server addresses, internet DNS servers, internet servers, DNS IP addresses, etc. Most client computers/devices will be configured to obtain an IP and a DNS server address automatically. DNS Root Servers . All the provided DNS servers are public DNS servers and not in any way affiliated with DNSchecker.org. Another reason to change DNS servers is if you're looking for better performing service. A DNS server is a computer server that contains a database of public IP addresses and their associated hostnames, and in most cases serves to resolve, or translate, those names to IP addresses as requested. For IPv6: 2001:4860:4860::8888 and/or 2001:4860:4860::8844. There you will be able to see the Default Gateway Address details under Wireless LAN details. DNS servers translate the friendly domain name you enter into a browser (like lifewire.com) into the public IP address that's needed for your device to actually communicate with that site. Tertiary DNS: 87.194.0.66. Know 4 Methods to Check IP Address. Enter 8.8.8.8 as the Preferred DNS Server All the public nameservers. On the server where DNS Server role installed, open Server Manager then navigate to Tools > DNS to open up the DNS Manager. O2 DNS Servers. Zapewnia z jednej strony rejestrację nazw domen internetowych i … Also open browser log into your router and you should find your dns server ip address etc as the xbox is not connecting to your pc so why look for your pc ip dns etc your console is connecting through the router almost a mini pc in its own right . This list of public and free DNS servers is checked continuously. Je to údaj, pomocí kterého DNS server překládá ve směru IP adresa -> doménové jméno. Usually, an IP address is displayed as a group of numbers, separated by dots: Let’s take an example with your net banking website. Already that same day DNS was resolving to the correct server/IP. IPv6 IP addresses use colons. I have an RVO8 linksys router 10.1.2.1 The clients are Windows 7 and windows XP with the gateway address 10.1.2.1 and the DNS address 10.1.2.220. The company has even hired KPMG to audit their systems annually to ensure that they’re delivering on their privacy promises. Primary DNS: 87.194.0.51. nfodiz. Bpascua. Enable DNS lookup on the server ip domain-lookup that way you can check the naming resolution from the server itself. DNS servers translate the friendly domain name you enter into a browser (like lifewire.com) into the public IP address that's needed for your device to actually communicate with that site. Netflix and Spotify, among others.. Domain Name System (DNS, pol. Step2. Your ISP automatically assigns DNS servers when your smartphone or router connects to the internet but you don't have to use those. October 15, 2015, 3:43am #5. thanks all. Google can achieve fast speeds with its public DNS servers because they're hosted in data centers all around the world, meaning that when you attempt to access a web page using the IP addresses above, you're directed to a server that's nearest to you. In the DNS Manager, right click the DNS server hostname on the left-pane and select Properties. Please keep in mind that it might log your queries (which is a huge information leak). Click any ISP to view its DNS servers present in the different locations and their IP addresses for use in your network or computer. According to the website, Google Public DNS … Firstly, the company never logs your IP address, which is what your ISP uses to track your internet habits. Here are several more public DNS servers. Enter the IP address of the other DNS server (forwarder) then press Enter. The most easiest way to find the DNS server IP address of your router is to check it from the router's web GUI. However, in some cases, you can define the IP addresses of the DNS servers that you need your computer to use and then they can be passed on to your router as well. thanks. The servers above are for OpenDNS Home, which you can make a user account for to set up custom settings. First you need to find out the IP address of your router. These are the DNS servers for the security filter, the most basic of the three that updates hourly to block malware and phishing sites: The CleanBrowsing adult filter (185.228.168.10) prevents access to adult domains, and the family filter (185.228.168.168) blocks proxies, VPNs, and mixed adult content. DNS (Domain Name System) is a system which translates the domain names you enter in a browser to the IP addresses required to access those sites, and the best DNS servers … This IP address consists of several numbers for the ease of computational purposes. To view network traffic, run below command as the root of a separate tab in the terminal tcpdump -n -s 1500 -i eth0 udp port 53, Then on another tab, generate dns traffic using host or dig command as below host www.google.com, Then you will be able to see a similar output to below, in the tcpdump output, In the above sample output, you can clearly see my machine (ip address 192.168.64.140) asking from the DNS server (ip address 192.168.64.2) about the domain name www.google.com, Your email address will not be published. DHCP server and DNS server have static IP. Slouží k ověření autentičnosti IP adresy. pl.wikipedia.org jest tłumaczona na odpowiadający jej adres IP, czyli 91.198.174.192.. DNS to złożony system komputerowy oraz prawny. 205157 Daniel Cid: CleanBrowsing v1.6a - dns-edge-europe-frankfurt-v 2020-12-25 16:30:02 UTC: valid DNSSEC 99 % Whois: 62.40.32.33 dns1.o2.ie. OpenDNS claims 100% reliability and up-time and is used by 90 million users around the world. In this case it is 192.168.1.1. Know, however, that not all DNS servers avoid traffic logging. Dzisiaj chciałbym pokazać jak pod Windows Serwer 2012 dodawać i zarządzać strefami DNS. Search domains. Below are more details on the best free DNS servers you can use instead of the ones assigned. Click the Notify tab. Type 'ipconfig' in order to view network information. Pratik. Step3. They can be defined in the '/etc/resolv.conf' file and the content of it can be viewed as below. To dzięki niemu serwer wie do jakiego systemu wysłać informacje. Your home network typically relies on a DNS Server supplied by your ISP. If you have used Internet there is a pretty good chance that you have used DNS even without realizing it. Yesterday I setup and installed a new Windows Server 2012 R2 box and configured it as a domain controller and DNS Server on my network. You can find all the information you'll need in your Welcome Pack, and we emailed it to you as well. In a multiple server configuration without the DNS round-robin functionality, many programs will use the first host server/IP address for the whole time to live (TTL) of the cache while using the second and third host servers/IP addresses only in the event of host failure. In order to find the IP address of the DNS server that is used by your router, one of the below methods can be used. DNS server. Recently checked. Then enter this IP address into the Address bar of your web browser and you will be prompted to insert username and password in order to get access to the web GUI of your router, 3. Non-filtering servers are available if you're not interested in blocking anything: 94.140.14.140 and 2a10:50c0::1:ff. Brian. Ping the DNS server from the router using its IP address, and make sure that the ip name-server command is used to configure the IP address of the DNS server on the router. Select Use the following DNS server addresses. But these IP addresses are not human friendly, which means it is not easy or possible for humans to keep in mind the IP addresses of all machines that are important to them. If you are using a Linux machine, open the Terminal. Faster than usual DNS servers; Cons: Nothing I could find; IP Addresses for DNS: 1.1.1.1, 1.0.0.1. Quad9 does not filter content—only domains that are phishing or contain malware will be blocked. Here's a quick reference if you know what you're doing, but we get into these services a lot more later in this article: A list of additional free DNS servers can be found in the table near the bottom of the page. Step 1: Configure TCP/IP . Expand the network interface name to edit the IP address settings. There's a 1.1.1.1 app for Android here and iOS here, for quick setup on mobile devices. Click any ISP to view its DNS servers present in the different locations and their IP addresses for use in your network or computer. Adres IP jest to ciąg liczb, który jednoznacznie określa komputer w sieci. Best DNS Servers For 2020 [Public and Free] 1. Stąd też pochodzi ich akronim – DNS, czyli Domain Name System (system nazw domenowych). a bit further down the page) but privacy and speed are two big wins you could see from switching. Hi Guys. Domains that you type, are searched in the order you list them, and the search stops when a valid name is found. If you're not sure, use the IPv4 DNS servers listed for a provider. 217.6.131.248 honi.dierichs.de. Google Public DNS service is probably one of the most popular free and public DNS servers on the planet. Step2. Jake IP adresy maji DNS servery O2?? Ugly options include no DNS record and force them to use a public IP to get to the site which you would NAT from your firewall to the internal server. United Kingdom DNS Servers. In most cases this is 192.168.1.1. The IP address is used to identify it to the world and plays an important part in the TCP/IP protocol. IP address of the preferred DNS server. Technically you are typing the domain name of the bank website (onlinesbi.com) in the web browser but to complete the request and load the webpage, the domain name must be converted to its IP address. The first 2 lines of the output provide you with the DNS server details. Has anyone with O2 broadband been having problems with the O2 DNS server or do they know anyone whos been having problems with the O2 DNS server. In the first step, you assign this server a static Internet Protocol (IP) address. Pokud potřebujete zajistit autentičnost pevné IP adresy, objednejte si reverzní záznam (známý také jako Pointer, PTR Record). Paul Ireland says: January 16, 2019 at 5:38 pm. 1.2. Replace those addresses with the IP addresses of the Google DNS servers: For IPv4: 8.8.8.8 and/or 8.8.4.4. Jon Jan 31, 2009 @ 23:40. DNS servers run special software and communicate with each other using special protocols. The Zone properties, the Name server tab list out the IP addresses of interfaces present on the DC. Reply Link. Further, not all of the DNS servers listed above return correct answers in any case. The most easiest way to find the DNS server IP address of your router is to check it from the router's web GUI. For IPv6: 2001:4860:4860::8888 and/or 2001:4860:4860::8844. Secondary DNS: 87.194.0.52. Either you changed your server's location, or you are using VPN and want to confirm either your active internet connection is your VPN or your home or office wifi, then this tool is … Finally, in case there was any confusion, free DNS servers do not give you free internet access. Another option would be the same as I just mentioend but adding a host file entry so they can use a hostname instead of the just the public IP. There is an art to explaining what others take for granted. 1. The gateway and dns server would be the ip address you access your router at. (In most cases the default IP address is 192.168.1.1). If that's what you're interested in, make sure you read through the FAQs on the DNS provider's site to make sure it's going to do (or not do) what you're after. Restricts the domain when looking up an address. 1. Moreover, MikroTik router can be specified as a primary DNS server under its dhcp-server settings. This video shows you how to use windows Telnet Client to check which DNS severs are being used by your O2 Wireless Box 2. Following is the list of all DNS servers of United Kingdom available in our database. This database contains public DNS Servers that are reachable by IPv4 or IPv6. Tertiary DNS: 87.194.0.66. Yet another common reason to use DNS servers from a third party is to prevent logging of your web activity and to circumvent the blocking of certain websites. The best free public DNS servers include Google, Quad9, OpenDNS, Cloudflare, CleanBrowsing, Verisign, Alternate DNS, and AdGuard DNS. Visit its website and select one that's geographically nearby for the optimal performance. I have IP and Netmask correct but I am not sure if either of the oter two will help? Therefore, DNS servers serve a vital role in operating a sort of phone book to lookup public websites’ IP addresses so that the end users can read the contents of those websites. Get the Latest Tech News Delivered Every Day, Best Free & Public DNS Servers (Valid December 2020), CleanBrowsing: 185.228.168.9 & 185.228.169.9, Alternate DNS: 198.101.242.72 & 23.253.163.53, Verizon DNS Servers & Other ISP Specific DNS Servers, A List of Every IP Address Used by Google, How to Fix DNS Server Not Responding Errors, How to Change DNS Server Settings on Home Computer Networks, How to Change DNS Servers on Most Popular Routers, How to Find Your Xbox Series X or S IP Address, Availability Concepts for Networks and Systems, How to Fix It When Your PS5 Wi-Fi Is Slow, How to Test for and Fix a DNS Leak in a VPN. For more issues or concerns, let me know in the comments below. If there are any IP addresses listed in the Preferred DNS server or Alternate DNS server, write them down for future reference. 167.233.5.203 dns-two.sicher-surfen.de. Required fields are marked *, Here is a simpler method: load a DNS leak checker tool like https://ipleak.net/ or https://www.xmyip.com/. (In most cases the default IP address is 192.168.1.1) For Windows Machines : 1.1. 194.172.160.4 mci004.btnet.de. Žatec 47232 ISP Alliance a.s. 2020-12-25 11:31:28 UTC: valid 74 % Whois: 5.102.56.177 In the command, remember to change ADAPTER-NAME with the name of your network adapter you identified on step No. CSV; Plaintext; JSON; IP Address Location AS Number Software / Version Checked Status Reliability Whois; 217.75.213.19 u217-75-213-19.static.grape.cz. Your DNS server for this would need to be public facing and would be purely for lookup, the domain itself, the web/content would be hosted on an alternative server, if this DNS server went down, no one could resolve your domain name. For changing IP addresses of DNS servers: Go to Control Panel and click on Network and Sharing Center; Click on the Internet connection that you’re using; Open Properties of your Internet connection; Double click on the Internet Protocol Version 4 (as shown in the above image) A new box will open. If it has listed both the IPs, then DNS server will register Host A record for both the IP addresses. Cloudflare built 1.1.1.1 to be the "fastest DNS service in the world" and will never log your IP address, never sell your data, and never use your data to target ads. It helps to translate web addresses (like ps4dns.com) to their IP addresses (like 103.168.0.1). Primary DNS : 87.194.0.51. dns server IP address assigned by your ISP or network admin. Primary and secondary DNS servers can be "mixed and matched" from different providers to protect you if the primary provider has problems. 2.2. Click Apply to save the change. As shown above this command provides you the IP address of the DNS server that is used by your router. https://www.o2.co.uk. W poprzedniej części opisałem jak działa system DNS oraz jak zainstalować rolę serwera DNS w Windows Server 2012. It will then display the default gateway details, In here there are 2 IP addresses and the one with the lowest metric is selected as the default IP address, which is 10.8.0.1 in this case, 2. Saying it is a second DNS server confuses it. DNS Cache Setup. First you need to find out the IP address of your router. What DNS service does is performing the conversion between these domain names and IP addresses. We'd love to connect with you on any of the following social media platforms. October 15, 2015, 3:43am #4. Ten of these servers are in the US, one in London, one in Stockholm, and one in Japan. These top-tier DNS servers are named A through M for the first 13 letters of the alphabet. The purpose of this document is to bring together certain points about Domain Name System (DNS) use by Cisco routers. The DNS recursor (also referred to as the DNS resolver) is a server that receives the query from the DNS client, and then interacts with other DNS servers to hunt down the correct IP. 88.79.149.4 ns.compra.de. All machines which are connected to the internet has an address named the IP address in order to find them over the internet by other machines on the internet. IP Address Location AS Number Software / Version Checked Status Reliability Whois; 185.228.168.9 security-filter-dns.cleanbrowsing.org. There are 13 important DNS root servers on the internet that store a complete database of domain names and their associated public IP addresses. ipconfig /flushdns Zaloguj się do routera (adres routera, to adres bramy domyślnej), jeśli dostajesz od ISP adres IP z serwera DHCP, to nie musisz nic zmieniać. In the DNS servers field, enter the Google Public DNS IP addresses, separated by a comma: For IPv4: 8.8.8.8 and/or 8.8.4.4. If you are using a Windows machine, open the Command prompt by typing 'cmd' into your Windows machine's search bar. Serwery DNS to swoiste książki telefoniczne internetu. The second method is to use the 'ipconfig /all' command in the command prompt. Humenné 20581 Ing.Jan Mindzak - Maximal Net — 2020-12-25 06:32:38 UTC Answer: The Domain Name System (DNS) is a distributed database in which you can map hostnames to IP addresses through the DNS protocol from a DNS server. 192.0.2.1 is an example for an IP address. Enable DNS lookup on the server ip domain-lookup that way you can check the naming resolution from the server itself.