Tor匿名网络专用的.onion域名得到了互联网管理机构的正式认可，它被互联网地址分配机构（IANA）列为专用域名。其它的专有域名包括：
| 域名 | RFC |
|---|---|
| 10.in-addr.arpa. | [RFC6761] |
| 16.172.in-addr.arpa. | [RFC6761] |
| 17.172.in-addr.arpa. | [RFC6761] |
| 18.172.in-addr.arpa. | [RFC6761] |
| 19.172.in-addr.arpa. | [RFC6761] |
| 20.172.in-addr.arpa. | [RFC6761] |
| 21.172.in-addr.arpa. | [RFC6761] |
| 22.172.in-addr.arpa. | [RFC6761] |
| 23.172.in-addr.arpa. | [RFC6761] |
| 24.172.in-addr.arpa. | [RFC6761] |
| 25.172.in-addr.arpa. | [RFC6761] |
| 26.172.in-addr.arpa. | [RFC6761] |
| 27.172.in-addr.arpa. | [RFC6761] |
| 28.172.in-addr.arpa. | [RFC6761] |
| 29.172.in-addr.arpa. | [RFC6761] |
| 30.172.in-addr.arpa. | [RFC6761] |
| 31.172.in-addr.arpa. | [RFC6761] |
| 168.192.in-addr.arpa. | [RFC6761] |
| 254.169.in-addr.arpa. | [RFC6762] |
| 8.e.f.ip6.arpa. | [RFC6762] |
| 9.e.f.ip6.arpa. | [RFC6762] |
| a.e.f.ip6.arpa. | [RFC6762] |
| b.e.f.ip6.arpa. | [RFC6762] |
| example. | [RFC6761] |
| example.com. | [RFC6761] |
| example.net. | [RFC6761] |
| example.org. | [RFC6761] |
| invalid. | [RFC6761] |
| local. | [RFC6762] |
| localhost. | [RFC6761] |
| onion. | [RFC-ietf-dnsop-onion-tld] |
| test. | [RFC6761] |
互联网工程任务组(IETF)也批准了《The .onion Special-Use Domain Name》RFC草案。获得认可之后.onion网站可以向证书颁发机构申请SSL证书，确保用户访问网站的真实性。