| Introduced | 1997 |
|---|---|
| TLD type | Country code top-level domain |
| Status | Active |
| Registry | Ascension Island Network Information Centre (run by Internet Computer Bureau) |
| Sponsor | Cable and Wireless (Ascension Island) |
| Intended use | Entities connected with  Ascension Island |
| Actual use | Various uses, sometimes connected to education and academia; a few sites actually on Ascension Island |
| Registration restrictions | 2nd-level registrant must have professional or academic qualification (apparently not actually enforced); 3rd level registrant must be resident on Ascension Island |
| Structure | Registrations are taken directly at the second level or at third level beneath various 2nd-level labels |
| Documents | Terms & Conditions; Rules |
| Dispute policies | Dispute Resolution Policy |
| Web site | NIC.AC |
.ac is the Internet country code top-level domain (ccTLD) for Ascension Island. It is administered by NIC.AC, a subsidiary of the Internet Computer Bureau based in the United Kingdom. Registration for this domain is open to anyone. .ac is also a second level domain for academic establishments in a number of countries; see .ac (second level). Registrations of internationalized domain names are accepted according to the following instructions.
