What is .sk?
A little context on Slovakia: the capital is Bratislava, the main language is Slovak, the currency is the Euro (EUR) and the international dialing code is +421. It's landlocked.
Next door on the map, you'll find .at for Austria, .cz for Czechia, .hu for Hungary, .pl for Poland and .ua for Ukraine.
IANA lists SK-NIC, a.s. as the manager of .sk, with an address in Slovakia. The registry's website is http://www.sk-nic.sk. 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.
Under the hood, the root zone points to 4 name servers for .sk, every one of them reachable over IPv6. The delegation is DNSSEC-signed, so resolvers can verify that answers for .sk haven't been tampered with on the way. Registration data is published over WHOIS (the WHOIS server is whois.sk-nic.sk).
.sk FAQ
What country is .sk?
.sk is the country-code top-level domain for Slovakia, in Central Europe.
What is Slovakia's domain extension?
Slovakia's website extension is .sk, its country-code top-level domain. "SK" is its ISO 3166-1 alpha-2 code.
Who owns the .sk domain?
IANA lists SK-NIC, a.s. as the manager of .sk: it runs the registry and sets the rules for Slovakia's ccTLD. Individual .sk names belong to whoever registers them.
Can I register a .sk domain from the US?
It depends on SK-NIC, a.s.'s policy. Some ccTLDs are open to anyone in the world, while others require a local address, company or trademark. Check the registry (http://www.sk-nic.sk) or an accredited registrar before you buy.
Is .sk DNSSEC-signed?
Yes. The root zone has a DS record for .sk, so DNSSEC validation works all the way down from the root.
How do I look up who owns a .sk domain?
Query the registry's registration data service: the WHOIS server is whois.sk-nic.sk. Many registrants use privacy services, so personal details may be hidden.
Sources
Data from IANA root zone version 2026102000. Last changed March 16, 2026. Spotted something wrong? Tell us.
