What is .sx?
IANA's records date the delegation of .sx to December 9, 2011.
A little context on Sint Maarten: the capital is Philipsburg, languages include English, French and Dutch, the currency is the Netherlands Antillean guilder (ANG) and the international dialing code is +1721.
IANA lists SX Registry SA B.V. as the manager of .sx, with an address in Sint Maarten (Dutch part). The registry's website is http://registry.sx. ccTLD managers set their own policies — who can register, which second-level names exist, pricing to registrars — so those rules differ from country to country.
On the technical side, .sx is served by 4 authoritative name servers, every one of them reachable over IPv6. It is also DNSSEC-signed: the root zone carries a DS record for .sx, which lets validating resolvers check its answers cryptographically. Registration data is published over WHOIS (the WHOIS server is whois.sx).
.sx FAQ
What country is .sx?
.sx is the country-code top-level domain for Sint Maarten, in Caribbean.
What is Sint Maarten's domain extension?
Sint Maarten's website extension is .sx, its country-code top-level domain. "SX" is its ISO 3166-1 alpha-2 code.
Who owns the .sx domain?
IANA lists SX Registry SA B.V. as the manager of .sx: it runs the registry and sets the rules for Sint Maarten's ccTLD. Individual .sx names belong to whoever registers them.
Can I register a .sx domain from the US?
It depends on SX Registry SA B.V.'s policy. Some ccTLDs are open to anyone in the world, while others require a local address, company or trademark. Check the registry (http://registry.sx) or an accredited registrar before you buy.
Is .sx DNSSEC-signed?
Yes. The root zone has a DS record for .sx, so DNSSEC validation works all the way down from the root.
How do I look up who owns a .sx domain?
Query the registry's registration data service: the WHOIS server is whois.sx. Many registrants use privacy services, so personal details may be hidden.
Sources
Data from IANA root zone version 2026102000. Last changed January 26, 2026. Spotted something wrong? Tell us.
