RDNS PTR records check

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To check is your ptr/rDNS records active you should simply run the next command in linux shell:

host -t PTR <ipaddress>

This command check the dns assignment :

host -a <hostname> 

From Windows you can use nslookup

nslookup <ipaddress>

ALso you can use dig for MX records (and not only) check:

dig www.yourdomain.com

If you want to be sure that you check it directly, not from cache use dig + trace:

dig + trace www.yourdomain.com