Subdomain Discovery API

Real Subdomain Finder

onescales/real-subdomain-finder

Discover every subdomain for any domain. Queries 40+ OSINT sources including cert transparency, DNS archives & web scanners. Results enriched with DNS validation, HTTP probing, and subdomain takeover detection. Simple Subdomain Lookup that works!

Subdomain Finder - Discover Every Subdomain Of A Domain

thirdwatch/subdomain-finder

Discover every subdomain for any apex domain. Merges 4 sources: certificate transparency (crt.sh), HackerTarget, RapidDNS, plus DNS bruteforcing of common names. Verifies each is live via DNS + HTTP probe.

Domain Intelligence Scraper | $10/1K | WHOIS+DNS+SSL

apivault_labs/domain-intelligence-scraper

WHOIS + DNS + SSL + subdomain lookup for any domain. Perfect for OSINT, security audits, SEO research, lead generation.

IoC Lookup

crawland/ioc-lookup

Real-time IoC reputation lookups (URL, hash, IP, domain) served from the Crawland threat-intelligence backend.

🔍 Domains, WHOIS, DNS lookup, domain intelligence MCP server for AI agents (Claude Desktop, Cursor, OpenAI Agents SDK, Vercel AI SDK). WHOIS + DNS records + subdomain discovery + SSL + tech stack detection via MCP — for OSINT and SEO AI workflows. Free tier available.

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.

Organization Registered Domain & Subdomain Scraper

lofomachines/organization-registered-domain-subdomain-scraper

Discover all domains registered by any organization by company domain. Find related domains, subdomains, registration dates, expiration dates, and registrar information. Perfect for brand protection, competitive analysis, M&A due diligence, and security research.

Domain WHOIS Lookup - Age, Expiry, Registrar, DNS

george.the.developer/domain-whois-lookup

Look up WHOIS data, domain age, expiration date, registrar, nameservers, and DNS records for any domain. Bulk lookup supported.

Domain WHOIS & DNS Lookup - Bulk Domain Intelligence

santamaria-automations/domain-whois-dns

Bulk domain intelligence — WHOIS records (registrar, dates, contacts), DNS records (A, MX, TXT, NS), and email provider detection. Perfect for B2B prospecting, security audits, domain monitoring, and data enrichment.

Substack Scraper — Newsletters, Posts, Authors & Subscribers

logiover/substack-newsletter-scraper

Discover Substack newsletters by category & leaderboard rank, then pull every post, author and publication. 30+ categories or direct subdomain. Per post: title, audience (free/paid), reactions, restacks. Per pub: subdomain, custom domain, author, subscription tiers. Public Substack API — no auth.