$ dig -x 104.27.12.102

; <<>> DiG 9.11.3-1ubuntu1.7-Ubuntu <<>> -x 104.27.12.102
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 54990
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
; COOKIE: ab6247726efaac1fae224db35cc627cc7f8ae9e529597978 (good)
;; QUESTION SECTION:
;102.12.27.104.in-addr.arpa.    IN      PTR

;; Query time: 157 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Sun Apr 28 15:23:08 PDT 2019
;; MSG SIZE  rcvd: 83