Check the reputation of an IP address, domain name or URL against a comprehensive list of blacklists and blocklists.
The majority of the lists we check are geared towards filtering hosts involved in the sending or operation of spam however
some of the lists are more specialized and will list hosts involved in other forms of cybercrime too.
These lists are most commonly known as DNSBLs (Domain Name System Blackhole Lists) or RBLs (Real-time Blackhole Lists)
and work using DNS based lookups. All DNSBLs have different listing and removal criteria, if you are trying to delist a host you'll need to do
this directly with the DNSBL operator. You can usually find more details about an active listing in the 'txt-record' response field.
If you want to only check some specific DNSBLs you can supply those using the 'zones' option or you can use the 'list-rating' option
to check a range of different lists using our built-in rating system.
This API currently checks more than 150 different DNSBLs.
If you are looking to filter IP addresses specifically used by Tor, VPNs, proxies, bots and other malicious activities
check out the IP blocklist and IP Probe APIs.
This API performs realtime lookups against external servers and may take up to 30 seconds to execute
depending on the current status of the DNSBLs. However, on average this API will complete in under 7 seconds.
Our DNS record caching policy is fixed at a 6 hour TTL.