fmb.la is a free composite blocklist for email classification, weighted from multiple sources so only the worst actors are listed.

Lookup

An IP address of either family, an AS number, or a domain name.

Currently listed
Level 1 186,655
183,322-192,537 | individual IP addresses
Level 2 962
936-973 | netblocks with too many listed addresses
Level 3 63
59-63 | whole autonomous systems
Recently listed ASNs
ASNOperatorListed
AS151391 BD Varendra IT 2026-11-08
AS209605 LT UAB Host Baltic 2026-11-08
AS63844 BD One Net Communication Ltd 2026-11-08
AS30006 US TOP BUSINESS INC 2026-11-06
AS62874 US web2objects GmbH 2026-11-05
AS219329 AE FLASH EDGE INFORMATION TECHNOLOGY LLC 2026-11-05
AS400940 US Railway 2026-11-04
AS208821 TR DURU INTERNET VE BILISIM TEKNOLOJILERI SANAYI TICARET LIMITED SIRKETI 2026-11-02
AS50360 BG Tamatiya EOOD 2026-10-30
AS46635 US AviationAI 2026-10-29