Certificate Transparency Monitor — AI Agent Recon API

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.

Subdomain Finder — Certificate Transparency (crt.sh)

bgfc97/crtsh-subdomain-finder

Discover subdomains of any domain from public Certificate Transparency logs (crt.sh). Attack-surface mapping and recon with first/last-seen dates. No key, no proxy.

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.

crt.sh Certificate Transparency Scraper

parseforge/crtsh-certificate-transparency-scraper

Search the crt.sh certificate transparency logs for any domain you control and surface the hosts behind it. Each record carries the common name, every subject alternative name, the issuing authority, serial number, and validity window. Built for attack surface mapping and asset inventory.

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.

Input: a domain. Output: JSON records of subdomains found in public Certificate Transparency logs (crt.sh), each with a live DNS resolution check. Passive recon — no active scanning of the target. Cheap pay-per-result pricing: $0.03 per domain checked.

SSL Certificate Monitor

blackfalcondata/ssl-certificate-monitor

Bulk SSL/TLS certificate monitor: issuer, validity window, days-to-expiry, chain validity, SANs and protocol for every domain, plus HTTP/HTTPS status, with expiring-soon and invalid-certificate flags and incremental change tracking. $1 per 1,000 domains.

SSL Certificate Monitor — Bulk Expiry & Chain Checker

accurate_pouch/ssl-monitor

Monitor SSL/TLS certificates in bulk. Expiry dates, issuer, protocol version, key size, certificate chain, SAN list. Webhook alerts for expiring certs. 5 domains free.

SSL Certificate Checker

perryay/ssl-certificate-checker

Check SSL/TLS certificate details for one or more domains. Retrieves issuer, subject, validity dates, cipher info, and chain analysis.

Domain OSINT Recon

prooflio/domain-osint-recon

Aggregates WHOIS, DNS records, certificate-transparency subdomains and PTR records for a domain into one structured report.