| ADNS | Authoritative Domain Name Server |
| AERO | AEROnautical Industry Sites |
| ARIN | American Registry of Internet Numbers |
| ATXI | Alliance Tournament NUMBER. 11 |
| AU | Australia |
| BB | Barbados |
| BE | Sites in Belgium |
| BFL | Bolt Face Logo |
| BGG | BoardGameGeek.com |
| BIND | Berkeley Internet Name Daemon |
| BIZ | Business sites |
| BR | Boys Respect |
| BSD | Branded Short Domain |
| BSDP | Boot Service Discovery Protocol |
| BX | Beirux |
| CC | Cocos (Keeling) Islands |
| ccTLD | country code Top Level Domain |
| ccTLDs | Country Code Top-Level Domains |
| CDNC | Chinese Domain Name Consortium |
| ch | sites in Switzerland (Confederation of Helvetia) |