Enter any domain name, or host ip address you would like to perform a DNS Blacklist check on. (i.e. mail.google.com or 22.214.171.124)
A DNS Blacklist, or DNSBL, is a means by which an Internet site may publish a list of IP addresses that some people may want to avoid and in a format which can be easily queried by computer programs on the Internet.
The technology is built on top of the Internet Domain Name System, or DNS. DNSBLs are chiefly used to publish lists of addresses linked to spamming. Most mail transport agent (mail server) software can be configured to reject or flag messages which have been sent from a site listed on one or more such lists.
When a mail server receives a connection from a client, and wishes to check that client against a DNSBL (let's say, dnsbl.example.net), it does more or less the following:
Looking up an address in a DNSBL is thus similar to looking it up in reverse-DNS. The differences are that a DNSBL lookup uses the "A" rather than "PTR" record type, and uses a forward domain (such as dnsbl.example.net above) rather than the special reverse domain in-addr.arpa.
This tool is intended can be used to lookup IP Addresses in the w3dt Blacklsit/Whitelist Database.
The w3dt DNS Blacklist Tool was written by David Nedved in 2012 for lab testing purposes.