Subdomains and Certificate Transparency

crt.sh, subfinder, Amass, assetfinder, openssl s_client — YOUR domains only.

1. Why Subdomains Matter to Defenders

Part of OSINT — Subdomains and Certificate Transparency.

15 min

+40 XP

2. crt.sh and Certificate Transparency

Part of OSINT — Subdomains and Certificate Transparency.

15 min

+40 XP

3. subfinder Amass and assetfinder on YOUR Domain

Part of OSINT — Subdomains and Certificate Transparency.

15 min

+40 XP

4. Lab — CT and Subdomain Notes YOU Own

Part of OSINT — Subdomains and Certificate Transparency.

25 min

+40 XP

5. Quiz — Subdomains and CT

Part of OSINT — Subdomains and Certificate Transparency.

10 min

+40 XP