Is there any free reverse DNS lookup service (DNS replication)? [closed]

"The one I find most effective in returning the largest number of domains at the moment is yougetsignal's. RUS-CERT's used to be better but has been moved and doesn't seem to return so much now.

(My emphasis is tracking malware domains, so I don't know if they are more or less effective for other sorts of job.)

This functionality (storing previously-looked-up domains for reverse lookup later) is sometimes known as ‘DNS replication’. ‘Reverse DNS’ generally refers to rDNS (PTR lookups), which only give you a single canonical name for an IP."

Try http://www.domaintools.com/reverse-ip/