.int is for "International" which is a Generic Top Level Domain (gTLD) - Not associated with a country.
Registration web site:
Second Level Domains Registered
Notes: The .int domain is used for registering organizations established by international treaties between or among national governments. Only one registration is allowed for each organization. Qualified organizations for domain names under the .int top-level domain are the "specialized agencies" of the UN (currently there are 14 of these) and the organizations having "observer status" at the UN (currently 16).
Domain Registration Rules: