6 useful DNS tools for network troubleshooting 6 useful DNS tools for ne...

6 useful DNS tools for network troubleshooting


When troubleshooting problems using our dynamic DNS service to host a website at home, connect to your work computer remotely or other online services, it can be very useful to have access to online tools that can help you narrow down the problems. Luckily, we provide these tools for free on the same site where you use the service.

Online DNS Tools

Port Check

Port check is useful to users who wish to verify port forwarding and check to see if a server is running or a firewall or ISP is blocking certain ports. It is the most useful tool when it comes to troubleshooting problems such as remote desktop, viewing DVR remotely and hosting websites on a dynamic IP. It is for remotely verifying if a port is open or closed. We receive lots of support tickets from our users saying that dynamic DNS service is not working for them since they cannot connect to a remote computer using the hostname signed up with us. 8 out 10 of those cases are due to port forwarding not being set up in their router.

If you are setting up dynamic DNS service to view your home security camera online remotely, or reach your web server hosted at home, or remote desktop into your computers in remote locations and the hostname does not conenct. The first thing you can do is open our Port Check page, put in your IP address and the port the application is running on to check if the port is open or not. Remote desktop port is 3389, DVR/Cam port is normally 80 or whichever port you have set up in your camera, and web server runs on port 80 by default. In case you get a 'Fail' result, you can refer to our port forwarding tutorial to set it up in your router.

DNS Lookup

DNS Lookup is a great tool to check DNS records for a domain name like A, AAAA, HINFO, SPF, MX, TXT, PTR and other advanced DNS records. Even though you can do these things from your own computers with Dig and Nslookup, it can often be useful to be able to perform DNS lookups from different locations to verify consistent DNS behavior and settings.


A ping test determines whether your computer can communicate with another computer over the network. Then, if network communication is established, ping tests also determine the connection latency (technical term for delay) between the two computers. Basic network connectivity tests can be useful to do from different locations to help you narrow down a problem. For that reason it’s useful to have access to several different services that can perform ping.

Location By IP

Location By IP can help you to identify visitor's geographical location. This tool displays the geophysical location of the network address on a Google Map. A public IP address is one that is assigned, technically, to an ISP rather than to an end user. It typically locates the endpoint of the ISP’s distribution equipment. What that means is the closest that they often get is the location of your ISP’s router – which could be next door, or it could be many miles away, depending on exactly how the ISP has configured their network, and where their equipment resides. The geolocation of an IP address can get close – perhaps identifying the city in which an IP address might be located, but it won't be so accurate as to providing exact street addresses.

SPF Generator

SPF (Sender Policy Framework) is a sender authentication method through which the administrator can specify which hosts are allowed to send email on behalf of a domain. The sending domain adds a specially formatted record into its DNS zone file identifying all authorized mail servers. The receiving mail server checks the sending domain's DNS zone file to see if the IP address from which the message originates matches one of the authorized IP addresses. Our SPF Generator walks you through creating SPF DNS records for domains to help try and cut down on outgoing spam and backscatter.

David Baker
June 23, 2017 AT 13:33

Port check is a GREAT tool. I used it a lot while setting up my website and Remote Desktop. Thank you!


Derek Manning
June 28, 2017 AT 12:15

Thank you for the feedback! Many of our customers have mentioned that the port check tool is very useful during their configuration process. Please feel free to suggest some more tools that you may find useful and we will try to have them added to the network tools list.


David Baker
June 28, 2017 AT 12:27

I noticed that you have MD5 hash tool. Would be nice if you also make a tool for SHA256 hash.


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