Blacklist Check
Check an address against DNS blocklists.
A blacklist check queries DNS-based blocklists (DNSBLs) to see whether they have flagged an IP address. Mail servers consult these lists when deciding whether to accept a connection, so a listing often explains rejected or spam-filed mail.
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Public internet targets onlyResults
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How Blacklist Check works
What it does
Check an address against DNS blocklists.
What you get
Listing responses from the checked DNS blocklist providers.
Live data sources
The target is sent to a network provider. Results include their source; timeouts and unavailable data are clearly marked.
What if a check cannot finish?
Confirm your input and try again. A timeout, blocked request, or unavailable provider is not proof that a domain is broken. Internet measurements and third-party services have limits.
Blacklist Check — frequently asked questions
I am listed. How do I get removed?
Go to the listing provider directly — each runs its own delisting page. Fix the cause first (an open relay, a compromised account, a purchased list) or you will simply be relisted.
Does a single listing block my mail?
It depends who uses that list. A major list affects a great many receivers; an obscure one may affect almost none. Weight a listing by the list's actual reach.
Should I check my IP address or my domain?
The sending server's IP is what most blocklists evaluate. Domain-based lists exist too, but IP listings are the usual cause of outright connection refusals.