Cyber Threat Intelligence Feeds

 https://github.com/TW-NCERT/ctifeeds

Provides an outdated list of different Cyber Thread Intelligence Feeds of other organizations.

Lists of DNS Blacklists

These projects either operate DNS based Real-time Blackhole Lists (RBL) or allow checking if an IP is contained. The Multi-RBL websites are helpful in finding a large quantity of RBLs.

• https://multirbl.valli.org/
  • Contains hundreds of RBLs, including descriptions of them and their return values.
• http://www.anti-abuse.org/multi-rbl-check/
• https://dnsbllookup.com
• https://www.dnsbl.info
• https://www.spamhaus.org/
  • Operates different RBLs such as for spam, exploits, domains with bad reputation, do-no-route ("drop-all-traffic"), and known spam operators.