| .edu | Educational organization (most US universities) |
| .k12 | US school site (not all US schools use this) |
| .ac | Academic institution (outside of US) |
| .sch | School site (some schools outside of the US use this) |
| .com | Company (usually .co in the UK) |
| .org | Any organization |
| .gov | Government agency |
| .net | Network |
| .mil | Military institution |
| .biz | Commercial purpose / business |
| .info | Commercial purpose / business |
| .uk | United Kingdom (country specific extension) |
| .jp | Japan (country specific extension) |
| .ca | Canada (country specific extension) |
| .au | Australia (country specific extension) |
(~) Sometimes you might see a “user” reference or tilde (~) symbol in a sub directory, followed by a name. This indicates that you may be on a personal Web page that is being hosted by an ISP (Internet Service Provider).