.arpa
| Rank | Date of registration | Domain | Registered to |
|---|---|---|---|
| 0. | 01-Jan-1985 | arpa | DARPA |
| 1. | 27-Sep-1994 | in-addr.arpa | Internet Assigned Numbers Authority |
| 2. | 14-Sep-2000 | e164.arpa | Internet Architecture Board |
| 3. | 10-Nov-2001 | ip6.arpa | Internet Assigned Numbers Authority |
| 4. | 01-Oct-2002 | uri.arpa | Internet Architecture Board |
| 4. | 01-Oct-2002 | urn.arpa | Internet Architecture Board |
| 6. | 29-Aug-2006 | iris.arpa | Internet Engineering Task Force |
| 7. | 29-Apr-2010 | in-addr-servers.arpa | Internet Assigned Numbers Authority |
| 7. | 29-Apr-2010 | ip6-servers.arpa | Internet Assigned Numbers Authority |
Read more about this topic: List Of The Oldest Currently Registered Internet Domain Names