Hi,
here's another exception I ran into.
If Reverse DNS expert bot runs into IP address which doesn't have DNS PTR record in fqdn form, then it gives exception.
In attachment are logs.
Example: There are cases when DNS gives two records for PTR.
$ nslookup 5.157.80.221 Server: 8.8.8.8 Address: 8.8.8.8#53
Non-authoritative answer: 221.80.157.5.in-addr.arpa name = 5.157.80.221. 221.80.157.5.in-addr.arpa name = aliancys.peopleinc.nl.
--------------------------------------------------------
$ nslookup 121.201.38.118 Server: 8.8.8.8 Address: 8.8.8.8#53
Non-authoritative answer: 118.38.201.121.in-addr.arpa name = 121.201.38.118.
Regards,