An IP Blacklist Checker is a free tool that checks an IPv4 address against major DNS blacklists and shows whether it is listed or clean on each one, with no signup needed. It gives a clear total verdict and explains what a listing means and how to request delisting.
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An IP Blacklist Checker is a free online tool that tests an IPv4 address against major DNS based blacklists, often called DNSBLs. It reverses the address, asks each list through DNS, and reports listed or clean for each one. No signup is needed.
Clean means the list returned no record for your address, so it is not listed there. Listed means the list returned a record, so receiving servers that use that list may reject or filter your mail. The total verdict counts how many of the checked lists report a listing.
If you are listed, first find and stop the cause, such as a hacked account, a bad list import, or mail sent without authentication. Then follow the delisting process of that list, because each list has its own form and rules. If you send through a shared service, contact the provider, because the IP may be shared. Also check your domain with the Domain Health and Blacklist Checker style checks on this site and the MX Record Lookup.
A DNS blacklist is a public list of IP addresses linked to spam or abuse. Receiving servers check these lists and may block mail from listed addresses.
No. Each receiver chooses which lists to use and how strictly to act. A listing on a major list is still a serious deliverability problem.
Fix the cause first, then use the delisting page of the list that reports you. Some listings also expire on their own after a set time.
This checker needs an IPv4 address, because blacklists store IPs, not domains. Use the domain tools on this site to find and check your mail setup.
On shared IPs, other senders can damage the reputation of the address. Ask your provider to move you or to act on the abuse, and see the Email Authentication Checker for your domain setup.
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