IP Blacklist Checker
Herramientas de RedHow to use this blacklist checker
- Enter an IPv4 address.
- It's checked against several major email blacklists (DNSBLs) at once.
- A listing means mail servers may reject or flag email from that IP as spam.
How does a DNSBL check work?
Each blacklist publishes its list as a special DNS zone, checking an IP means querying a reversed version of it against that zone. A response means the IP is listed; no response means it's clean, at least for that particular list.
My IP is listed, what do I do?
Each blacklist has its own delisting process, usually a form on their website, search for the specific list's name plus "delisting" or "removal request" to find it.
Does this check every blacklist that exists?
No, there are dozens of DNSBLs in existence. This checks several of the most widely used ones, which cover the majority of real-world impact, but a clean result here doesn't guarantee a clean result everywhere.