Blacklist check
Enter an IP address, or a domain to check its own and its mail servers' addresses. Every list is queried live through our own resolver.
Try 127.0.0.2test point, must be listed 127.0.0.1test point, must not be listed exim.ro
How the check works
Enter an IPv4 or IPv6 address, or a domain.
For a domain we take its own addresses (A/AAAA) and those of its mail servers (MX); domain lists get the domain itself.
Each address is asked on every active list, live, through our own validating resolver.
Only a code the list documents counts as a listing, and only NXDOMAIN as not listed; anything else is reported as unavailable.
Lists checked
Every few minutes each list is asked about its test points: 127.0.0.2 must be listed and 127.0.0.1 not (for domain lists, the test names the list documents). A list that fails is reported as unavailable until it passes again.
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IP addresses
Spamhaus ZEN
zen.dq.spamhaus.netpassing 2026-11-02 06:27:40 UTC
Look up on Spamhaus ZEN -
IP addresses
SpamCop
bl.spamcop.netpassing 2026-11-02 06:27:40 UTC
Look up on SpamCop -
IP addresses
Mailspike
bl.mailspike.netpassing 2026-11-02 06:27:40 UTC
Look up on Mailspike -
domains
Spamhaus DBL
dbl.dq.spamhaus.netpassing 2026-11-02 06:27:40 UTC
Look up on Spamhaus DBL
What the results mean
- Listed
The list answered with a code it documents as a listing. The code and its meaning, in the list's own words, are shown.
- Not listed
The list answered NXDOMAIN, which is the only answer that means "not listed".
- Unavailable
No usable answer: a timeout, a DNS error, a refusal code (some lists refuse queries from certain resolvers or above a volume), or a code the list does not document. Never counted as clean.
Background: DNS blocklists: how they work and how to get delisted