[skissane]

.int is more exclusive.

.gov is restricted to US government, but consider the immense sprawl that is the US federal government, and then consider that US state and US local governments are allowed in the club too, and it doesn't look so exclusive any more

.mil is restricted to the US military, but that is a gargantuan entity with countless agencies and bases and divisions and whatnot all of whom seem to want to have publicly accessible websites (even for stuff that is obviously only useful for people actually in the US military), and .mil turns out to be a dime a dozen too

.int – under current rules, you need to be an international organization established by international treaty, or else you need observer status with the UN General Assembly. Numerically that is smaller than either of the above two categories. (It also has some random stuff that doesn't belong under current rules, like the YMCA – which wasn't established by treaty, and doesn't have UN General Assembly observer status – but those are grandfathered registrations.)

[GhettoMaestro]

Dot int is basically non-existent compared to mil and gov. Also being attached to the UN makes it uncool instantly.

[rdl]

nato.int is the coolest domain in the world for me.

[skissane]

It is also the first ever .int domain, and indeed the original motivation for creating .int (to replace the short lived .nato)

[mattl]

Remember tpc.int?

[justincormack]

Has it gone now? Yeah I remember it.

[GhettoMaestro]

Maybe that is because NATO actually has capabilities to act, rather than just sitting around writing lofty platitudes ;).