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    • .sk

    Country-code top-level domains

    Overview

    • .sk is the Internet country code top-level domain (ccTLD) for Slovakia.
    • Introduced on 29 March 1993 and intended for entities connected with Slovakia.
    • Administered by SK-NIC, a.s.; names may be registered directly at the second level or at the third level beneath various second-level labels.

    History

    • Delegation/Introduction: Implemented 29 March 1993.
    • Registry: Administered by SK-NIC, a.s.; SK-NIC was recognised by IANA in the mid-1990s as the delegated manager of .sk.
    • Name changes: The operator changed its name from EUNET Slovakia to EuroWeb Slovakia in 1999 and to SK-NIC in 2006.
    • Governance: In 2006 SK-NIC transferred some domain-administration competences to the State and established a policy-making committee including internet community and government representatives.
    • Commercial: CentralNic acquired SK-NIC from a private Netherlands-based company in December 2017.
    • Scale: 465,385 registered .sk domains (data recorded 2023-08-20). SK-NIC has reported a very large number of accredited registrars at peak levels.
    • Historical note: Prior to the 1993 split of Czechoslovakia, the former state used the .cs domain.

    Usage and Audience

    • Primary users are businesses, organizations and individuals connected with Slovakia.
    • The TLD is described as "popular in Slovakia" and is commonly used to represent Slovak local identity online.
    • SK-NIC has operated with a broad registrar ecosystem (registry statements cite a high maximum number of resellers/registrars).

    Registration Rules

    • Eligibility: An applicant may be any physical or legal person that has a postal address in any of the following: EU member states, European Economic Area member states, European Free Trade Association member states, or the United Kingdom.
    • Trademark and name prohibitions: A domain name must not use words that are elements of:
      • a trademark registered by the Industrial Property Office of the Slovak Republic;
      • an international trademark with Slovak Republic designation;
      • a European Union trademark;
      • a trademark with a reputation within European Union territory;
      • a mark of common knowledge that became commonly known within Slovak Republic territory or in relation to the Slovak Republic, where the rights belong to someone other than the registrant.
    • Allowed characters and label rules:
      • Maximum label length: 63 characters.
      • Permitted characters: Latin letters (a–z), digits (0–9) and the hyphen (-).
      • Hyphen rules: a hyphen cannot be at the beginning or end of a label; two hyphens cannot appear consecutively.
    • Registration structure: registrations are available at the second level and at third level beneath various second-level labels.

    SEO and Brand Impact

    • As the national ccTLD for Slovakia, .sk signals a Slovak presence or affiliation and is commonly used by local organizations and individuals.
    • The domain is widely adopted within Slovakia, supporting local brand recognition and geographic targeting for Slovak audiences.

    Notable Cases or Examples

    • Corporate change: CentralNic's acquisition of SK-NIC in December 2017 is a notable commercial milestone.
    • Incident noted in external coverage: there are published accounts about a stolen Slovak national domain (reported in external articles linked from registry resources), referenced as a notable incident in public sources.

    Operator

    SK-NIC, a.s.

    Whois

    % IANA WHOIS server
% for more information on IANA, visit http://www.iana.org
% This query returned 1 object

domain:       SK

organisation: SK-NIC, a.s.
address:      Namestie SNP 14
address:      Bratislava 81106
address:      Slovakia

contact:      administrative
name:         GAC delegate
organisation: Ministry of Investments, Regional development and Informatization of the Slovak Republic
address:      Pribinova 25
address:      Bratislava 81109
address:      Slovakia
phone:        +421/2/209 28 888
e-mail:       gac@mirri.gov.sk

contact:      technical
name:         Technical Director
organisation: SK-NIC, a.s.
address:      Namestie SNP 14
address:      Bratislava 81106
address:      Slovakia
phone:        +421 2 350 350 30
fax-no:       +421 2 350 350 39
e-mail:       tech-c@sk-nic.sk

nserver:      A.TLD.SK 194.0.45.1 2001:678:70:0:0:0:0:1
nserver:      B.TLD.SK 2001:678:90:0:0:0:0:1 84.245.96.1
nserver:      C.TLD.SK 195.12.159.1 2001:678:9c:0:0:0:0:1
nserver:      E.TLD.SK 194.169.218.16 2001:67c:13cc:0:0:0:1:16
nserver:      F.TLD.SK 185.24.64.16 2a04:2b00:13cc:0:0:0:1:16
nserver:      G.TLD.SK 212.18.248.16 2a04:2b00:13ee:0:0:0:0:16
nserver:      H.TLD.SK 212.18.249.16 2a04:2b00:13ff:0:0:0:0:16
ds-rdata:     2324 13 2 3e7e4f60eccc4ad8f96c654563265c9a4e56b9f1ac998e88e1cf8150ff1a5205
ds-rdata:     56329 13 2 d76d7cc87d568b76634db673c73ba19e3c87c337efaeeebdce59636d4c73a985

whois:        whois.sk-nic.sk

status:       ACTIVE
remarks:      Registration information: http://www.sk-nic.sk

created:      1993-03-29
changed:      2025-05-10
source:       IANA

    Registrars