The action of finding a HostName given an IP address, using DNS.
bash-2.05b$ host 203.97.10.50 50.10.97.203.IN-ADDR.ARPA domain name pointer hoiho.wlug.org.nz
A ReverseLookup uses PTR ResourceRecords in DNS.
Contrast ForwardLookup.
5 pages link to ReverseLookup: