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Extensions .cc .org. ab

When you see an extension on a domain do you know what it means?

What is an 'extension' on a domain?

Something like this:

tg = Togo
tk = Tokelau
to = Tonga
tt = Trinidad, Tobago
tn = Tunisia
tr = Turkey
tm = Turkmenistan
tc = Turks and Caicos Islands
tv = Tuvalu

Example: www.any-old-domain.com.tt

Here is a good site to go to:

https://www.iana.org/cctld/cctld-whois.htm

ab org cc Extensions

Now, why does a domain end up with .tt, instead of .com or .org or .net. I understand that these are country designations, but what determines if you use the country designation instead of one of the generic. I not that .gov is for us government and .mil is us military, is .tt only for the Trindad or Tobago government's use?

Extensions .cc .org. ab Gaming Video & Issues Computer

Special extensions are available to people within that country only. For instance you cannot own a .us domain and be setup to do business with it in India.