DIG is a command-line tool for querying DNS Name Server (similar to nslookup utility available in Windows and host utility). dig utility can be used for querying DNS about the host address (both A and AAAA), name server(NS), mail exchange(MX), Pointer Record(PTR), SOA (Start Of Authority) and others. DIG is a part of BIND software package ( BIND package is developed and managed by Internet Systems Consortium ISC). Usage Example :- 1. Ask for a host address :- dig nkn.in 2. Ask from a specific server :- dig nkn.in @8.8.8.8 ; <<>> DiG 9.8.5-P2 <<>> nkn.in @ 8.8.8.8 ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 13527 ;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0 ;; QUESTION SECTION: ;nkn.in. IN A ;; ANSWER SECTION: nkn.in. 14103 IN A 164.100.56.206 ;; Query time: 171 msec ;; SERVER: 8.8.8.8#53 (8.8.8