Professional Subdomain Monitor

Production-ready subdomain monitoring system with API and CLI for continuous recon.

PlatformWebfreeglobal

Professional Subdomain Monitor is a self-hosted, production-ready system with a REST API and CLI that continuously discovers a target's subdomains from certificate-transparency and threat-intel sources and sends Slack or Telegram notifications the moment a new one appears, with an integrated scheduler for recurring monitoring. It's aimed at bug bounty hunters and security researchers who need to catch attack-surface changes on authorized targets as they happen rather than by manually re-running recon periodically.

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Full match profile

Behind the summary, Matchbox keeps a richer profile of Professional Subdomain Monitor - the signals our matcher actually reads to decide when to surface it. It stays private; claim the listing to see and control it.

Problem & pain-point mapping
Who we surface it to (audience fit)
What it's a strong alternative to
Trust & credibility signals

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