Reverse DNS lookup
is generally used when we want to resolve an IP address to a hostname.
There are numerous applications such as in spam filters, networking
looking and monitoring tools, where this finds its use.
this video, we will use the Domain Information Groper (DIG) tool to do
a reverse DNS on various addresses to find the associalted hostnames.
The technique emplyed in this to simply write the IP address in dotted
notation but in reverse order and then append ".in-addr.arpa." to it
and make a DNS PTR (Pointer Record)
query. As an examlple, if the address is 220.127.116.11, in order to do a
reverse DNS lookup, we need to do a DNS PTR lookup for the host
"18.104.22.168.in-addr.arpa." .We use 2 examples in this video to make
sure the procedure is well understood.