IP

• by domain Bypassing CDN: Across Search like Shodan... https://github.com/m0rtem/CloudFail

• geo wi-fi -- bssid router scan http://3wifi.stascorp.com/

• social engineering ip logging

using

• domain - whois

• geo: geoip

• statistic and logs iknowwhatyoudownload.com

• blacklists & spam databases

• comments on websites and forums

• search engines like Shodan...