The .aero suffix will create an online community for all sectors of the air transportation industry, and .coop will serve a similar function for cooperative organizations around the world.
The decision Thursday to add seven suffixes culminates a 3 1/2-year effort by leaders of the loose-knit, self-governing Internet community.
The process had been held up by some corporations, which were concerned that the proliferation of new suffixes would make it tougher for them to protect their trademarks, said Internet Society President and Chief Executive Don Heath, whose group represents individual Net users.
"It's been a horrible, ghastly process," Heath said.
Although the new addresses seem like a minor addition to the Internet, they have the potential to add new kinds of functionality of the network.
Some of the proposed suffixes could be used to create novel kinds of services. One company seeks to let people turn their telephone numbers into Internet addresses, and another would use the suffix .yp to designate an international online yellow pages directory.