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Shodan is used by blackhats and whitehats to quickly find open ports and other fingerprints of IP's and servers.
https://www.shodan.io/ Scan for open ports on your router. Any ports below 1024, and you can custom scan other ports as well. https://www.grc.com/x/ne.dll?bh0bkyd2 | |
Cyber Hygiene Services | CISA - Automated Free External Network Scan |