.su
Top-level domain
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.su is an Internet country code top-level domain that was designated for the Union of Soviet Socialist Republics on 19 September 1990. Even though the Soviet Union itself was dissolved 15 months later, the .su top-level domain remains in use to... Wikipedia
Actual use: Mostly used by entities connected with post-Soviet states
Intended use: Entities connected with the Soviet Union
Registered domains: 105,884 (7 December 2021)
Registration restrictions: Passport required