Unverified50% confidenceFactExact time

The name .arpa originates from the Advanced Research Projects Agency (ARPA) of the U.S. Department of Defense, and has since been redefined to stand for Address and Routing Parameter Area.

1

Sources

50%

Confidence

Long-term

Relevance

9/12/2026

First Seen

Sources

What Is a .arpa Domain? Reverse DNS Lookup and How to Get One for Free

Related Entities

.arpaconcept ARPAcompany

Related Claims

Unverifiedin-addr.arpa is used for reverse resolution of IPv4 addresses; for example, the IP address 192.0.2.1 is mapped to 1.2.0.192.in-addr.arpa.70% similar VerifiedarXiv is an academic preprint server maintained by Cornell University.53% similar

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