MultiRBL

Is this address on a blacklist?

Enter an IP address or a domain. I check it against many spam and bot blocklists, plus its reverse DNS.

Tip: press / to jump to the field.

How to read the result and what this site does not check

What the results mean

Listed
The address or domain has an entry on this list. Some mail servers may reject or flag mail from it as spam.
Clean
The list has no entry for this address.
Refused
The list refused to answer because the query came from a public DNS resolver. This is not a listing, just missing information.
Error
No answer was received (timeout or DNS error). Try again.

Collateral lists

UCEPROTECT L2 and L3 cover whole subnets or autonomous systems (ASNs). A listing there can be caused by neighbours, so it is informational only and does not affect the verdict.

Outlook / Microsoft

Microsoft does not publish a DNSBL, so it cannot be queried over DNS. A clean result here does not rule out a block at Microsoft. Check and request removal in the Microsoft delist portal.

Reverse DNS

The hostname assigned to an IP address (PTR record). Mail servers expect an address to have one and that name to resolve back to the same address (forward-confirmed reverse DNS, FCrDNS). A missing or mismatched record raises the risk of landing in spam.