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Reverse Lookup

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by tony 1 view

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Could someone give me how reverse lookup works and how an new ISP should setup this function with it's upstream ISP. Any resources or links you could refer me to would be greatly appreciated. Please be as detailed or general as you want I just need as much info on this topic as I can get. Any input welcomed!!
Thanks,
Tony

3 replies

by Former member

Reverse lookup: IP-to-FQDN (Hostname)
Not really necessary.
Some providers use reverse lookups to verify source of things like emails, sort of used as a SPAM checker, since anyone can forge a source name/IP address, it's not as easy when it is checked against Internet DNS records.

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