Finding subdomains

There are several ways to attempt to find subdomains for a given domain.

1. The methods listed on Site exploration
2. Use Merklemap: https://www.merklemap.com/ (CLI, paid API)
3. Use SecurityTrails: https://securitytrails.com/ (Cloudflare JS)
   1. Browser console based API scraper: securitytrails-domain-scraper.js (useful when there is more than one page)
4. Use Subdomain Finder: https://subdomainfinder.c99.nl/ Paid API also available.
5. Use Subdomain Center: https://www.subdomain.center/
6. Use DNSdumpster: https://dnsdumpster.com/
7. Search Chrome User Experience Report origin lists, which contain domains collected using telemetry in the Chrome browser. See https://archive.org/details/crux_origin_list
8. Use Cisco Umbrella (OpenDNS) top domains lists: http://s3-us-west-1.amazonaws.com/umbrella-static/index.html
9. https://osint.sh/subdomain/ (Cloudflare JS)
10. Certificate transparency logs: https://crt.sh/ as well as https://www.merklemap.com/
11. Software options:
    1. Subfinder, which includes several of the above methods: https://github.com/projectdiscovery/subfinder
    2. assetfinder: https://github.com/tomnomnom/assetfinder
    3. Knockpy: https://github.com/guelfoweb/knock
    4. dnsenum2: https://github.com/SparrowOchon/dnsenum2
    5. dnsmap: https://github.com/resurrecting-open-source-projects/dnsmap
    6. gobuster: https://github.com/OJ/gobuster
    7. Sublist3r: https://github.com/aboul3la/Sublist3r
    8. Altdns: https://github.com/infosec-au/altdns
    9. Subenum: https://github.com/42zen/subenum
    10. AMASS: https://github.com/OWASP/Amass — A powerful tool for in-depth subdomain enumeration, leveraging various APIs, web scraping, and DNS resolution
    11. The Harvester: https://github.com/laramies/theHarvester — Gathers subdomains using search engines, Shodan, and other OSINT sources
    12. subdomains-top1million-110000.txt: A wordlist of popular subdomains for brute-force enumeration. Use with tools like gobuster or Sublist3r for effective DNS brute-forcing
12. Twitter search
13. Archive.Today, with asterisk: https://archive.today/*.example.org
14. Additional methods: https://blog.appsecco.com/a-penetration-testers-guide-to-sub-domain-enumeration-7d842d5570f6 https://en.wikipedia.org/wiki/DNS_zone_transfer https://www.domaintools.com/resources/blog/zone-walking-zone-enumeration-via-dnssec-nsec-records/