Email blacklists, indexed.

Aggregate of Spamhaus SBL, XBL, and PBL — the single most consulted IP blocklist in email.

zen.spamhaus.org

Manually curated list of verified spam sources and snowshoe operators.

sbl.spamhaus.org

IPs running exploits, open proxies, worms, or compromised mail relays.

xbl.spamhaus.org

End-user / dynamic IP ranges that should not deliver mail directly.

pbl.spamhaus.org

Domain-based block list for URLs and sender domains used in spam, phishing, and malware.

dbl.spamhaus.org

Reputation list powering Barracuda Email Security appliances and ESS.

b.barracudacentral.org

Spamtrap-driven RBL widely used by ISPs and small MTAs.

bl.spamcop.net

Composite list combining spam, dynamic, proxy, and web sub-zones.

dnsbl.sorbs.net

Individual IPs caught sending spam to UCEPROTECT's spamtrap network.

dnsbl-1.uceprotect.net

Blocks neighbouring IPs of Level 1 listings — collateral by netblock.

dnsbl-2.uceprotect.net

ASN-level listing — extreme and rarely used by mainstream MTAs.

dnsbl-3.uceprotect.net

Spamtrap-driven, auto-expiring RBL.

psbl.surriel.com

Reputation list focused on aggressive snowshoe and bulk patterns.

bl.mailspike.net

Reputation scoring zone — returns a level rather than a block.

rep.mailspike.net

Hobbyist spamtrap RBL with quick expiry.

all.s5h.net

German-language spamtrap-driven RBL used by many DE/EU MTAs.

ix.dnsbl.manitu.net

Multi-list of domains observed in spam, phishing, malware, and abuse.

multi.surbl.org

URI blocklist queried for domains found inside message bodies.

multi.uribl.com

SORBS sub-zone for IPs observed sending spam directly.

spam.dnsbl.sorbs.net

Commercial RBL targeting hard-to-list snowshoe spammers.

sip.invaluement.com

Domain reputation list paired with ivmSIP, focused on spam URLs.

uri.invaluement.com

Reputation list tied to SPF behaviour and DKIM presence.

dnsbl.spfbl.net

German hobbyist RBL focusing on snowshoe and bulk spam.

spam.dnsbl.anonmails.de

Composite RBL covering several sub-lists for IPs and URIs.

bl.0spam.org

Commercial reputation feed used by many MSPs and ESPs.

combined.mail.abusix.zone

Identifies dynamic / consumer IPs that look like residential ranges.

dyna.spamrats.com

Lists IPs sending without a valid PTR / rDNS record.

noptr.spamrats.com

IPs caught sending unsolicited mail to Spamrats spamtraps.

spam.spamrats.com

Reputation score (0-100) rather than a hard block.

score.senderscore.com

Reputation list tied to the GBUdb global Bayesian database.

truncate.gbudb.net