ulasame90@banana3162:~$ dig -x 206.223.154.230

; <<>> DiG 9.4.2 <<>> -x 206.223.154.230
;; global options: printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 53611
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;230.154.223.206.in-addr.arpa. IN PTR

;; Query time: 211 msec
;; SERVER: 206.223.144.254#53(206.223.144.254)
;; WHEN: Wed Apr 16 00:52:06 2014
;; MSG SIZE rcvd: 46