I want to register a domain with the .sea extension, is that possible now that a lot of new extensions are being released?

  • 3
    You can view a list of top-level domains that have been approved here and here. That extension isn't listed, so it's not possible.
    – dan
    Oct 9, 2016 at 5:12

1 Answer 1


The authoritative list of all TLDs is http://www.iana.org/domains/root/db.

The top-level domain .sea is not listed.

It may of course be possible to register it with alternative DNS roots, but that’s probably not what you want, because your visitors would have to configure the list of their DNS servers accordingly.

cesidianroot.net lists .sea as belonging to the Principality of Sealand. I couldn’t find any registration information, so I guess this TLD is not open to the public.

  • Haha Principality of Sealand. Remember hearing an episode about it on This American Life or something.
    – xji
    Oct 14, 2016 at 16:24

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