.su
| Introduced | 19 September 1990 |
|---|---|
| TLD type | Country code top-level domain |
| Status | Active |
| Registry | Russian Institute for Public Networks (РосНИИРОС) |
| Sponsor | Russian Institute for Public Networks (РосНИИРОС) |
| Intended use | Entities connected with the Soviet Union |
| Actual use | Mostly used by entities connected with post-Soviet states and websites about the su shell command. |
| Registered domains | 111,695 (3 February 2025) |
| Registration restrictions | Passport required |
| Structure | Registrations are permitted directly at the second level |
| Documents | Documents |
| Dispute policies | None |
| DNSSEC | yes |
| Registry website | ripn |
.su is an Internet country code top-level domain (ccTLD) that was designated for the Soviet Union on 19 September 1990. Even though the Soviet Union itself was dissolved 15 months later, the .su top-level domain remains in use to the present day. It is administered by the Russian Institute for Public Networks (RIPN, or RosNIIROS in Russian transcription).
The .su ccTLD is known for usage by cybercriminals, hackers and scammers.