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    • .si

    Country-code top-level domainsIDNDNSSEC

    Overview

    • .si is the Internet country code top-level domain (ccTLD) for Slovenia.
    • Introduced on 1 April 1992 and administered by ARNES (Academic and Research Network of Slovenia).
    • Intended for entities connected with Slovenia; registrations are taken directly at the second level.

    History

    • Introduced: 1 April 1992.
    • Registry/operator: ARNES; sponsor: Republic of Slovenia.
    • Growth milestones:
      • 2010: registry hosted around 80,000 domain names.
      • 2012: reached 100,000 registered domains.
      • 2022: crossed 150,000 registered domains.
      • May 2024: 155,464 registered domains.
    • Governing documents and policies include SI TLD regulations and an ADR dispute policy.

    Usage and Audience

    • Typical users: Slovenian organizations, businesses, public institutions, and individuals.
    • Widely used for domain hacks because "si" is the second-person singular of the verb "to be" in Slovene and some other Slavic languages.
    • Also adopted by Spanish-language sites because "sí" means "yes" in Spanish.
    • Examples of uses and communities:
      • Local and national institutions in Slovenia.
      • Brand and service short URLs.
      • Political parties and international groups using a memorable .si domain.

    Registration Rules

    • General restrictions: Wikipedia notes "None" for general restrictions; registry terms require applicants to submit in good faith and for lawful purposes and not infringe third-party rights.
    • Reserved names:
      • 113.si reserved for the police.
      • 112.si reserved for Civil Protection and Disaster Relief administration.
      • si.si and rs.si reserved for needs of the Slovenian government.
    • Structure and character rules:
      • Registrations are at the second level.
      • Minimum length: 2 characters (for IDNs the minimum relates to the IDN itself).
      • Maximum length: 63 characters (for IDNs the maximum relates to the ACE string).
      • Neither first nor last character may be a hyphen.
      • A domain may not contain consecutive hyphens in the third and fourth positions unless it is an ACE string of an allowed IDN.
    • Dispute resolution: an ADR dispute policy is used for domain name disputes.

    SEO and Brand Impact

    • Security/trust: McAfee research in 2010 ranked the Slovenian TLD among the more secure TLDs (tenth most secure in that study), which can support trustworthiness claims.
    • Branding: .si can be used creatively for memorable domain hacks and short, brandable URLs (including use by non-Slovenian entities leveraging the Spanish meaning "sí").

    Notable Cases or Examples

    • zadovoljna.si — an example of a Slovene-language domain hack (means "You are pleased", feminine form).
    • morena.si — used by the Mexican political party MORENA.
    • sinistraitaliana.si — used by the Italian Left (Sinistra Italiana) political party.
    • pep.si — used by Pepsi as a URL shortener.
    • jit.si — hosts the Jitsi video conferencing software.

    Operator

    Academic and Research Network of Slovenia (ARNES)

    Whois

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

domain:       SI

organisation: Academic and Research Network of Slovenia (ARNES)
address:      Tehnološki park 18
address:      Ljubljana 1000
address:      Slovenia

contact:      administrative
name:         Barbara Povše
organisation: Academic and Research Network of Slovenia (ARNES)
address:      Tehnološki park 18
address:      Ljubljana 1000
address:      Slovenia
phone:        +386 1 4798800
fax-no:       +386 1 4798899
e-mail:       barbara.povse@register.si

contact:      technical
name:         Benjamin Zwittnig
organisation: Academic and Research Network of Slovenia (ARNES)
address:      Tehnološki park 18
address:      Ljubljana 1000
address:      Slovenia
phone:        +386 1 4798800
fax-no:       +386 1 4798899
e-mail:       benjamin.zwittnig@register.si

nserver:      B.DNS.SI 153.5.81.140 2001:1470:8000:53:0:0:0:44
nserver:      F.DNS.SI 194.146.106.62 2001:67c:1010:15:0:0:0:53
nserver:      H.DNS.SI 2001:500:14:6054:ad:0:0:1 204.61.216.54
nserver:      I.DNS.SI 194.0.25.22 2001:678:20:0:0:0:0:22
nserver:      K.DNS.SI 185.159.197.11 2620:10a:80aa:0:0:0:0:11
nserver:      L.DNS.SI 185.159.198.11 2620:10a:80ab:0:0:0:0:11
ds-rdata:     1635 13 2 c2977306e3439d4f8d40a1a7f5dea9e93a408c9fb3c5aa32bad08febf0eb848b

whois:        whois.register.si

status:       ACTIVE
remarks:      Registration information: https://www.registry.si/

created:      1992-04-01
changed:      2025-03-26
source:       IANA

    Registrars