https://www.ionos.com/digitalguide/server/know-how/dnsbl/
Feb 20, 2023 - Domain Name System-based Blackhole Lists like the real-time blackhole lists play an important role in fighting spam. We explain how they work.
domain name systemdnsblbasedblackholelist
https://www.spamhaus.org/blocklists/combined-spam-sources/
An SMTP traffic blocklist, listing port-25 based detections due to unsolicited emails, poor list hygiene, or compromised accounts sending malicious emails.
combinedspamsourcescssip
https://www.spamhaus.org/blocklists/spamhaus-blocklist/
Spamhaus Blocklist contains IPs identified as sending spam, hosting malicious content, hijacking IP space, or acting like a bulletproof hosting company.
blocklistipdnsbleffectiveemail
https://www.spamhaus.org/blocklists/exploits-blocklist/
The Exploits Blocklist flags compromised IPv4/IPv6 addresses that have been hijacked to use by third-party exploits.
exploitsblocklistipdnsblemail
https://nic.ua/en/domains/tools
Online tools for domains and IPs: RDAP (WHOIS alternative), DNS record lookup, MX/SPF/DKIM checks, DNSBL spam-list check, and IP geolocation by country and...
ip checkdns recordsdomaintoolsonline
https://www.invaluement.com/
The invaluement anti-spam lists includes 1 URI and 2 IP DNS lists which block evasive spams that slip past most spam filters.
antispamlistsuridnsbl
https://www.spamhaus.org/blocklists/policy-blocklist/
A dataset containing end-user IP address ranges from which email should never be sent directly to the final destination.
policyblocklistpbldnsbleffective