Troubleshooting Reverse DNS
Troubleshooting Reverse DNS can be tricky, but here are a few ways to test it out.
Linux/UNIX utilities
To find Reverse DNS for IP 208.94.147.96
Using Host -
$ host 208.94.147.96
Output:
96.147.94.208.in-addr.arpa domain name pointer www.dnsmadeeasy.com.
The reverse of the IP 208.94.147.96 is correctly pointing to the domain name assigned to it.
Using nslookup -
nslookup 208.94.147.96
Output
Server: 208.94.146.229 Address: 208.94.146.229#53 Non-authoritative answer: 96.147.94.208.in-addr.arpa name = www.dnsmadeeasy.com. Authoritative answers can be found from: 147.94.208.in-addr.arpa nameserver = ns4.dnsmadeeasy.com. 147.94.208.in-addr.arpa nameserver = ns2.dnsmadeeasy.com. 147.94.208.in-addr.arpa nameserver = ns0.dnsmadeeasy.com. 147.94.208.in-addr.arpa nameserver = ns1.dnsmadeeasy.com. 147.94.208.in-addr.arpa nameserver = ns3.dnsmadeeasy.com.
Using DIG (Will not work in all environments) -
dig -x 208.94.147.96 +trace
Output
; <<>> DiG 9.5.1 <<>> -x 208.94.147.96 +trace ;; global options: printcmd . 3600000 IN NS B.ROOT-SERVERS.NET. . 3600000 IN NS C.ROOT-SERVERS.NET. . 3600000 IN NS D.ROOT-SERVERS.NET. . 3600000 IN NS E.ROOT-SERVERS.NET. . 3600000 IN NS F.ROOT-SERVERS.NET. . 3600000 IN NS G.ROOT-SERVERS.NET. . 3600000 IN NS H.ROOT-SERVERS.NET. . 3600000 IN NS I.ROOT-SERVERS.NET. . 3600000 IN NS J.ROOT-SERVERS.NET. . 3600000 IN NS K.ROOT-SERVERS.NET. . 3600000 IN NS L.ROOT-SERVERS.NET. . 3600000 IN NS M.ROOT-SERVERS.NET. . 3600000 IN NS A.ROOT-SERVERS.NET. ;; Received 288 bytes from 63.219.151.25#53(63.219.151.25) in 0 ms 208.in-addr.arpa. 86400 IN NS X.ARIN.NET. 208.in-addr.arpa. 86400 IN NS Y.ARIN.NET. 208.in-addr.arpa. 86400 IN NS INDIGO.ARIN.NET. 208.in-addr.arpa. 86400 IN NS BASIL.ARIN.NET. 208.in-addr.arpa. 86400 IN NS CHIA.ARIN.NET. 208.in-addr.arpa. 86400 IN NS Z.ARIN.NET. 208.in-addr.arpa. 86400 IN NS HENNA.ARIN.NET. 208.in-addr.arpa. 86400 IN NS DILL.ARIN.NET. ;; Received 199 bytes from 128.8.10.90#53(D.ROOT-SERVERS.NET) in 3 ms 147.94.208.in-addr.arpa. 86400 IN NS NS1.DNSMADEEASY.COM. 147.94.208.in-addr.arpa. 86400 IN NS NS2.DNSMADEEASY.COM. 147.94.208.in-addr.arpa. 86400 IN NS NS4.DNSMADEEASY.COM. 147.94.208.in-addr.arpa. 86400 IN NS NS0.DNSMADEEASY.COM. 147.94.208.in-addr.arpa. 86400 IN NS NS3.DNSMADEEASY.COM. ;; Received 149 bytes from 192.26.92.32#53(HENNA.ARIN.NET) in 6 ms 96.147.94.208.in-addr.arpa. 1800 IN PTR www.dnsmadeeasy.com. 147.94.208.in-addr.arpa. 86400 IN NS ns0.dnsmadeeasy.com. 147.94.208.in-addr.arpa. 86400 IN NS ns1.dnsmadeeasy.com. 147.94.208.in-addr.arpa. 86400 IN NS ns3.dnsmadeeasy.com. 147.94.208.in-addr.arpa. 86400 IN NS ns2.dnsmadeeasy.com. 147.94.208.in-addr.arpa. 86400 IN NS ns4.dnsmadeeasy.com. ;; Received 167 bytes from 208.80.124.2#53(NS1.DNSMADEEASY.COM) in 3 ms