.CA

.CA (.ca) is the Internet country code top-level domain (ccTLD) for Canada. The domain name registry that operates it is the Canadian Internet Registration Authority (CIRA).

Registrants can register domains at the second level (e.g., example.ca). Third-level registrations in one of the geographic third-level domains defined by the registry (e.g. example.ab.ca) were discontinued on October 12, 2010, but existing third-level domain names continue to be supported.

Third-level (provincial) and fourth-level (municipal) domains
UBC's registry operations once favoured fourth-level names (such as (such as city.toronto.on.ca)) for purely local entities or third-level names for entities operating solely within one province. Nationally incorporated companies could have a .CA domain, while provincially incorporated companies required the letters of their province, like .MB.CA. Only an entity with presence in two or more provinces was typically registered directly under .CA; this complex structure (and the long delays in getting .CA registration) caused many Canadian entities to favour the .com, .org and .net

The second-level domain name '.GC.CA' (Government of Canada) is commonly mistaken as one of the regional domains under which CIRA will allow Government of Canada registrations. .GC.CA is actually a standard domain like all other .CA domain names. CIRA does not register domain names under .GC.CA directly.

The .MIL.CA second-level domain name is also a standard domain and is registered to the Department of National Defence (DND). The .MIL.CA suffix is used internally by DND on its intranet, the Defence Information Network (DIN) or Defence Wide Area Network (DWAN), to distinguish intranet-only websites. registrations, despite the then-higher cost.