Dig Domains
; <<>> DiG Dig.Domains <<>> any 54.105.97.99.in-addr.arpa
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 19165
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 512
;; QUESTION SECTION:
;54.105.97.99.in-addr.arpa. IN ANY

;; ANSWER SECTION:
54.105.97.99.in-addr.arpa. 7199	IN PTR mail.ibew150.com.

;; Query time: 52 msec
;; SERVER: 8.8.8.8#53(8.8.8.8)
;; WHEN: Fri Apr 20 21:45:48 EDT 2018
;; MSG SIZE  rcvd: 84


Check the DNS Propagation for 54.105.97.99.in-addr.arpa