Daygle.net maintains an IP blocklist identifying IP addresses that target mail and web servers. Separate lists are available for all IPs, IPv4-only, and IPv6-only addresses.

The blocklists can be downloaded here:

• blocklist.txt - Combined IPv4 and IPv6 addresses.
• blocklist_ipv4.txt - IPv4 addresses only.
• blocklist_ipv6.txt - IPv6 addresses only.