Internet properties established in 1988

.at is the Internet country code top-level domain (ccTLD) for Austria. It was introduced on 20 January 1988 and initially administered by the University of Vienna, before being taken over in 1998 by nic.at, based in Salzburg.

.es is the country code top-level domain (ccTLD) for Spain administered by the Network Information Centre of Spain.

.sg is the Internet country code top-level domain (ccTLD) for Singapore. It was first registered in September 1988. It is administered by the Singapore Network Information Centre (SGNIC). Registrations are processed via accredited registrars.

.be is the Internet country code top-level domain (ccTLD) for Belgium. In November 2022, there were 1,746,459 registered domain names using it.

.ie is the country code top-level domain (ccTLD) which corresponds with the ISO 3166-1 alpha-2 code for Ireland. The Internet Assigned Numbers Authority (IANA) list the Computing Services Computer Centre of University College Dublin as its sponsoring organisation for the .ie domain. Since 2000 the business of administrating the domain registry has been handled by IE Domain Registry Limited. Domain name registration is open to individuals located in, or with a significant connection with, any part of the island of Ireland.

.th is the Internet country code top-level domain (ccTLD) for Thailand.

.pt is the Internet country code top-level domain (ccTLD) for Portugal and is managed by Associação DNS.PT. It has the following second-level domains:

thumb|upright|The first IRC server, tolsun.oulu.fi, a Sun-3 server on display near the [[University of Oulu computer centre]]

The domain name int is a sponsored top-level domain (sTLD) in the Domain Name System of the Internet. Its name is derived from the word international, characterizing its use for international organizations and treaty-related purposes. The first use of this domain was by NATO, which had previously been assigned the top-level domain .nato.