census2012.sourceforge.net
Research paper and dataset about internet-wide scanning and host discovery from 2012.
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islegitsite.com
Islegitsite helps search threat intelligence, IP reputation, domains, and security investigation data.
metadefender.opswat.com
Security lookup platform for scanning files, hashes, URLs, IPs, and domains against threat data.
thingful.net
IoT search and discovery platform for finding connected devices and sensor data sources.