We can find hostname from ip-address in multiple ways but some of useful and short commands are mentioned below:
$ nslookup <ip> or $ host <ip>
test1@dev[~]$ nslookup 22.214.171.124 Server: 126.96.36.199 Address: 188.8.131.52#53 184.108.40.206.in-addr.arpa name = oradev.testenv.com. or test1@dev[~]$ host 220.127.116.11 18.104.22.168.in-addr.arpa domain name pointer oradev.testenv.com.
Above marked in green is hostname