Eugene Dvurechenski <jno@glas.net> says:

warsaw · warsaw · commit a20fdcdd14a6 · 1999-05-26T04:02:18.000Z
there is "su" top level domain still maintained in ex-USSR.  at
    least "*.msk.su" zone (Moscow, USSR) is still in use.
diff --git a/Tools/world/world b/Tools/world/world
@@ -291,6 +291,7 @@ nameorgs = {
     #
     # See <url:http://www.ripe.net/docs/ripe-159.html#222123>
     "uk": "United Kingdom (common practice)",
+    "su": "Soviet Union (still in limited use)",
     }
 
 

Original file line number	Diff line number	Diff line change
`@@ -291,6 +291,7 @@ nameorgs = {`
`291`	`291`	`#`
`292`	`292`	`# See <url:http://www.ripe.net/docs/ripe-159.html#222123>`
`293`	`293`	`"uk": "United Kingdom (common practice)",`
	`294`	`+ "su": "Soviet Union (still in limited use)",`
`294`	`295`	`}`
`295`	`296`
`296`	`297`