- https://www.wappalyzer.com/
- WayBack Machine
- https://github.com/danielmiessler/SecLists
- https://dnsdumpster.com/
- https://www.shodan.io/
- FoxyProxy
- User-Agent Switcher and Manager
- https://osintframework.com/
- Google Advanced Search
- Google Refine Web Searches
- DuckDuckGo Search Syntax
- Bing Advanced Search Options
- https://viewdns.info/
- Threat Intelligence Platform
- Censys search
- Recon-ng
- Maltego
- https://lookup.icann.org/en
| WHOIS record | whois site.com |
| DNS A records | nslookup -type=A site.com |
| DNS MX records at DNS server | ns lookup -type=MX site.com 1.1.1.1 |
| DNS TXT records | nslookup -type=TXT site.com |
| DNS A records | dig site.com A |
| DNS MX records at DNS server | dig @1.1.1.1 site.com MX |
| DNS TXT records | dig site.com TXT |