Certificate Transparency Logs Subdomain & SSL/TLS Asset Finder

Subdomain Finder

happitap/subdomain-finder

Subdomain Finder is a high-speed intelligence tool that uncovers subdomains for any target domain using Certificate Transparency (CT) logs. Unlike traditional brute-force tools, it requires no heavy traffic and provides results in seconds.

Scrape SSL/TLS certificate transparency logs from crt.sh for any domain. Great for security audits and subdomain discovery. Returns common name, subdomains (SANs), issuer and validity. Pay per certificate; empty runs free.

Check SSL/TLS certificates for any website: expiration date, issuer, subject, hostname match (SNI), chain/authorization status, and common HTTPS misconfigurations. Useful for SEO audits, security checks, and uptime monitoring.

Subdomain Finder & Recon Tool

andok/subdomain-finder

Discover subdomains for any target via passive OSINT sources. Ideal for security bug bounties and attack surface mapping.

Subdomain Finder - Discover Subdomains via CT Logs

logiover/subdomain-finder

Discover every subdomain of any domain using Certificate Transparency logs (crt.sh). Fast bulk subdomain enumeration for security recon, attack-surface mapping, asset discovery and SEO. No API key — export to CSV or JSON.

SSL Certificate Inspector - TLS Audit & Expiry Monitor

santamaria-automations/ssl-certificate-inspector

Inspect SSL/TLS certificates for any domain: chain validation, expiry dates, cipher suites, TLS versions, subject alt names, issuer details, and security scoring. Export data, run via API, schedule and monitor runs, or integrate with other tools.

crt.sh Subdomain Finder - Certificate Search

dataio/crtsh-subdomain-finder

Find every subdomain of a domain from public Certificate Transparency logs (crt.sh), one row per host: days until certificate expiry, issuer, environment inferred from the name (staging, dev, production) and first-seen date. Asset inventory, no API key.

Subdomain Enumeration via Certificate Transparency

perryay/subdomain-enumeration-ct-logs

Discover subdomains from Certificate Transparency logs using crt.sh and CertSpotter. Supports multi-source aggregation, deduplication, diff reporting, continuous monitoring, wildcard detection, and batch scanning — ideal for penetration testing, attack surface mapping, and security monitoring.

SSL Certificate Checker

bgfc97/ssl-certificate-checker

Check TLS/SSL certificates for many hosts: issuer, valid-from/to, days until expiry, expired/expiring-soon flags, SAN domains and trust status. For uptime & certificate-expiry monitoring. No key, no proxy.

Subdomain Finder - All Subdomains via CT Logs + Live DNS

eliai/subdomain-finder

Finds a domain's subdomains from Certificate Transparency logs, with an optional live DNS check of each, for one domain or up to 100. Returns one record per domain with the deduplicated subdomains, which ones resolve and their IPs. For bug bounty hunters, pentesters and security teams.