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Reverse DNS

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6 replies

by ssssss2

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How do I check the RDNS entry for my mail servers? Suppose my mail server is test.exapmle.com(ip= 65.34.56.121) what should be my RDNS?

6 replies

by jguasch

Are you talking about MX? or simple reverse lookup?

nslookup "your mail servers fqdn"

by corey1981

you can use NSLOOKUP on windows NT or XP.
nslookup 65.34.56.121
this will give you the PTR (AKA pointer record) for your ip address. if you are running your own mail server, you should get your isp to set up the PTR record for your ip address to point to mail.example.com (if example.com was your domain name) so that you will not have as many problems sending email to aol & getting black-listed. They will usually only change your PTR record if you are a business class customer. then when you run
nslookup 65.34.56.121 you would get mail.example.com instead of the 121-56-34-65.in-addr.arpa

by jwoods3

On Unix, using nslookup you should get:

# nslookup 65.34.56.121

121.56.34.65.in-addr.arpa name = test.exapmle.com.

Hope this helps!!!

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