Certificate Transparency Domain Monitor

Website domain name validator

saswave/website-domain-name-validator

Verify if a website is still up and running or if it contains a redirection to a new domain name. Data enrichment at scale.

Monitor public Facebook posts for your keywords on a schedule. Only new posts, no duplicates across keywords, no Facebook account needed. Unofficial.

Expired & Dropped Domains — Daily Feed

nogards95/domain-drop-monitor-scraper

A daily machine-readable feed of expired and dropped domain names for threat-intelligence, brand-protection, and domain-investing workflows. Up to 10,000 fresh domains per feed per day, deduplicated, filterable by TLD, ready in seconds. No login, no API key.

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.

Domain OSINT Recon

prooflio/domain-osint-recon

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

Check domain age, registration date, expiration, registrar, and nameservers for any list of domains. No API key needed — uses the public RDAP standard. Perfect for SEO research, fraud detection, lead enrichment, and domain investing.

Failed Runs Monitor

jannovotny/failed-runs-monitor

This actor will let you know about failed or time outed runs of your actors and tasks via Slack or email. It can also notice you about successful runs with empty dataset, check JSON schema of dataset items, or about runs that are running for too long.

Domain Expiry & SSL Certificate Monitor - DNS Change Alerts

that_red_bird/domain-ssl-monitor

Never lose a domain or serve an expired certificate again. Checks domain expiry via RDAP, live TLS certificate expiry and validity, plus nameserver and DNS record changes. Warns before expiry and alerts when records move. No API key needed.

Track domain expiry, registrar, statuses and nameservers via RDAP (modern WHOIS). Get days-until-expiry alerts. Schedule-ready.

Brand protection monitoring that checks your brand names against every domain actually registered in the last 24 hours plus new TLS certificates. Detects typosquats, homoglyph/IDN impersonation and combosquatting, and scores each domain 0-100 by phishing risk.