How to check reverse DNS
The DNS is used to determine what IP address is associated with a given host name, so to reverse resolve a known IP address is to lookup what the associated host name for it. A reverse lookup is often referred to simply as reverse resolving, or more specifically reverse DNS lookups.
Use of reverse DNS.
Check reverse DNS for given IP address under Linux or Windows XP/Server 2003.
You can use standard UNIX / Linux utilities such as nslookup, dig or hosts to find out reverse DNS of a given IP address.
eg; under Linux/UNIX/
$ host 66.65.123.34
or
dig -x IP (66.65.123.34)
and under Linux/UNIX/Windows
nslookup 66.65.123.34
Use of reverse DNS.
Anti-spam
Network troubleshooting
Avoid spammers and phishers using a forward confirmed reverse DNS etc
Check reverse DNS for given IP address under Linux or Windows XP/Server 2003.
You can use standard UNIX / Linux utilities such as nslookup, dig or hosts to find out reverse DNS of a given IP address.
eg; under Linux/UNIX/
$ host 66.65.123.34
or
dig -x IP (66.65.123.34)
and under Linux/UNIX/Windows
nslookup 66.65.123.34
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