Favicon Hash Bug Bounty Recon
Passive infrastructure mapping and advanced techniques for 2026.
Why favicon hashing is a top recon technique
- • Zero active scanning — no traffic reaches the target during discovery
- • Finds hosts not in DNS records (forgotten servers, dev instances)
- • Bypasses WAFs by finding origin IP behind CDN via favicon match
- • Works across the entire internet simultaneously via search platforms
- • Reveals technology stack immediately — no scanning needed
The favicon recon workflow
1
Hash target domain → paste https://target.com into FaviconHasher
2
Multi-platform search → use all available platform links for max coverage
3
Identify related infrastructure → hosts sharing the same favicon may be related
4
Cross-reference every finding with the authorized program scope
5
Fingerprint technologies → use our database to identify what's running
6
Validate findings safely and follow the program rules
Multi-platform pivoting strategy
Different platforms have different coverage. Compare results across platforms, then verify each finding against the authorized scope.
Automation with the API
import requests
for url in ["https://target.com", "https://app.target.com"]:
r = requests.get("https://faviconhasher.codejavu.tech/api/v2", params={"url": url})
d = r.json()
print(d["hashes"]["mmh3"], d["technology"], d["links"]["shodan"])