What is the whois server for .arpa?
By default, whois server for .arpa TLD is whois.iana.org. This can be used to fetch the .arpa domain/website whois information. Extension .arpa sponsoring organisation is Internet Architecture Board (IAB) and its registered on 01-01-1985.
Sponsoring Organisation Details
Internet Architecture Board (IAB).
c/o IETF Administrative Support Activity, ISOC.
1775 Wiehle Ave..
Suite 102.
Reston, Virginia 20190 5108.
United States.
Usage
whois -h <whois server> <domain name>
For example
whois -h whois.iana.org hiox.arpa