[root@murloc ~]# host -v 66.117.157.138
Trying "138.157.117.66.in-addr.arpa"
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 52121
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 2, ADDITIONAL: 0
;; QUESTION SECTION:
;138.157.117.66.in-addr.arpa. IN PTR
;; ANSWER SECTION:
138.157.117.66.in-addr.arpa. 837 IN PTR discourse.org.
;; AUTHORITY SECTION:
157.117.66.in-addr.arpa. 84227 IN NS ns2.lmi.net.
157.117.66.in-addr.arpa. 84227 IN NS ns3.lmi.net.
Received 115 bytes from 108.59.15.5#53 in 0 ms