Updated: 09/12/2023 by Computer Hope

ARPA may refer to any of the following:

ARPA logo

1. Short for Advanced Research Projects Agency, ARPA is a US agency first led by Dr. J.C.R. Licklider to help fund and promote research after the Soviet Union launched Sputnik in 1957. This agency helped make ARPANET (Advanced Research Projects Agency Network) and was later renamed to DARPA (Defense Advanced Research Projects Agency) in 1972.

2. Short for address and routing parameter area, .arpa is a TLD (top-level domain) created for transitions from ARPANET hostnames to the newer DNS (domain name system) Type names in the late 1980s.

3. The Internet domain suffix .arpa is short for Internet infrastructure TLD.

ARPANET, Computer abbreviations, IPTO, Network terms