General
- Extension
- .ac.cn
- Type
- Second-level extension
- Meaning
- Second-level zone under .cn (China)
- Parent extension
- .cn
- Registry
- China Internet Network Information Center (CNNIC)
- Registry website
- www.cnnic.cn
- Registered since
- 28 November 1990 (.cn)
Properties
- DNSSEC in the root zone
- .cn: yes
- Name servers
- .cn: 6 (5 with IPv6)
- WHOIS server
- whois.cnnic.cn
- RDAP server
- none reported to IANA
- At 1blu
- on request via kissdomain
Registration conditions
The registration conditions for this extension are set by the responsible registry. The current rules are on its website: www.cnnic.cn.
Sources: Registry China Internet Network Information Center (CNNIC) · IANA Root Zone Database: .cn · As of 25 October 2026