Pricing

Pay per event

Try for free

Go to Apify Store

Subdomain Finder — Passive Subdomain Enumeration (Subfinder)

Try for free

Discover subdomains of any domain fast using the open-source Subfinder engine — passive enumeration from dozens of public sources (certificate transparency, DNS datasets, search engines). For attack-surface mapping and authorized security research.

Pricing

Pay per event

Rating

0.0

(0)

Developer

daehwan kim

Actor stats

Bookmarked

Total users

Monthly active users

7 days ago

Last modified

OSINT Subdomain Discovery - Find All Subdomains API through CLI

The Apify CLI is the official tool that allows you to use Subdomain Finder — Passive Subdomain Enumeration (Subfinder) locally, providing convenience functions and automatic retries on errors.

Install Apify CLI

Using installation script (macOS/Linux):

$curl -fsSL https://apify.com/install-cli.sh | bash

Using installation script (Windows):

$irm https://apify.com/install-cli.ps1 | iex

Using Homebrew:

$brew install apify-cli

Using npm:

$npm install -g apify-cli

Other API clients include:

Subdomain Finder — Passive Subdomain Enumeration (Subfinder) API in Python

Subdomain Finder — Passive Subdomain Enumeration (Subfinder) API in JavaScript

Subdomain Finder — Passive Subdomain Enumeration (Subfinder) OpenAPI definition

Subdomain Finder — Passive Subdomain Enumeration (Subfinder) API

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.

Logiover

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.

Andok

Sublist3r Subdomain Finder & Takeover Scanner

datacach/sublist3r-subdomain-finder

Subdomain enumeration from passive OSINT sources — certificate transparency logs, passive DNS and public APIs — with optional active HTTP/TLS fingerprinting of every live host, scored for takeover risk. Run it only against domains you are authorized to assess.

DataCach

Subdomain Radar — Passive OSINT Enumeration

saregaa/subdomain-scraper

Discover subdomains silently. No brute-force — pure OSINT from 5 passive sources with DNS resolve, HTTP probing & takeover detection.

Saregaa

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.

Perry AY

Subdomain Finder - CT Log Enumeration + Live DNS Check

eliai/subdomain-finder

Enumerate a domain's subdomains from Certificate Transparency logs, with an optional live DNS resolve. All subdomains in one record. $0.005 per domain (not per subdomain), far cheaper than paid finders; failures are free.

Broke to Built

Certificate Transparency Scraper: Subdomain Discovery

arman-bd/certificate-transparency-scraper

Query certificate transparency logs via crt.sh to enumerate subdomains, issuers, validity windows and certificate history for any domain. Passive attack-surface discovery. no login, no proxy, no browser.

Arman Hossain

Subdomain Discovery API

crawland/subdomain-discovery-api

Paginated subdomain enumeration for any registered domain — DNS records, registrar, WHOIS, vendor reputation, and category labels per subdomain, served from the Crawland threat-intelligence backend.

Crawland

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.

Thirdwatch

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!