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Why?
- Information gathering gives bigger surface for attacks and helps to find vulnerable systems easily.
Subdomain Enumeration
- subdomains may have outdated or buggy software which can help us to get access to main domain
- Forgotten subdomain are rarely maintained so chances of being easy targets.
How to find ?
- Google things like
site : example.com
- virustotal.com
- dnsdumpster.com
- crt.sh
- sublist3r tool
- amass
Sources :