I have been asked to use a .dom extension for an intranet service that I'm working on. I used to think that it was a mistake but the client says it's not.

Can you explain what is a .dom domain and how to use it?

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    Looks like it's been registered but I can't find anything past that. Jan 11, 2017 at 10:05
  • "for an intranet" - on an intranet you can use anything you like, but it's probably a mistake to do so, as you can end up with potential conflicts.
    – MrWhite
    Jan 11, 2017 at 10:49
  • @AndrewLott It is because you are not looking in the official sources. If you look at iana.org/domains/root/db you will see that as of today .DOM is not an existing TLD in IANA root zone, hence it basically does not exist on the Internet as everyone uses this root zone. Feb 25, 2018 at 7:32

1 Answer 1


You know a .com? Well that, but now it says .dom. You just think it's weird because you've heard .com a lot which makes it sound normal, but on a technical level, they're similar.

There used to be only a few extentions, but now you can have almost anything you want (e.g. if you have enough money, you can do www.example.ferdinand).

Internal servers are even easier, it doesn't have to be an existing extention, just set up your internal server to understand that example.dom is as much a domain as example.com, or as the commonly used example.test in a development setting.

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    It is a very bad advice to give. Do not use blindly a TLD to name your internal resources. You will suffer a lot in case of collisions, and it already happened with .dev. Instead register a domain name, say mycompany.example (in a true existing TLD) and use it as base to name your internal resources like int.mycompany.example, etc. Feb 25, 2018 at 7:30

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