Subdomain Center

What it does

Free subdomain finder — no signup, no API key. Search 10 billion+ subdomains across 1 billion+ domains, including hosts behind Cloudflare that DNS brute-force and certificate logs miss. Find all domains associated with Bitrix or Grafana in seconds. Subdomain Center scours the web, gathering and interpreting data from across the Internet to map the world's shadow IT. Three engines: cuttlefish finds subdomains of a domain, octopus clusters a brand, and ammonites hunts a keyword across every host.

Free subdomain finder — no signup, no API key. Search 10 billion+ subdomains across 1 billion+ domains, including hosts behind Cloudflare that DNS brute-force and certificate logs miss. The world

The world's largest Subdomain & Shadow IT Intelligence database. Freely accessible — up to 500 results per query, in random order. Add an API key for full, sorted results. In an independent subdomain-enumeration benchmark against delta.com , Subdomain Center returned more than double the next-best free API. The reviewer noted the data contains “strange and complex (but totally valid) subdomains that don't seem to show up anywhere else” — hosts that brute-force and Certificate Transparency alone do not surface. Read the benchmark . The same dataset powers subdomain discovery inside BBOT , theHarvester and OWASP Amass . Most subdomain tools resolve a wordlist or replay Certificate…from subdomain.center

• 
  Subdomains Lookup2021 · subdomains.whoisxmlapi.com · ▲7

  Instantly returns the subdomains of 582 million domain names

• 
  SEO Domain Finder2023 · niteo.co · ▲66

  Easily find high-authority expired and deleted domains

• 
  Fast subdomain enumerator written in Rust2022 · github.com · ▲23

  Hello! I'm learning Rust and also information security, so what better way to learn than to put a tool together practicing both skills? I've tried to use a couple of different tools for subdomain enumeration (part of the Discovery-party when it comes to penetration testing), but none of them were very fast, even if the DNS resolver I pointed them towards is, so I wrote my own tool that leverages concurrency to check a lot of subdomains, fast! It's written in Rust, main parts being using Tokio and async_channels, and I think it works good enough for a first release. I wanted to get recursive…

• 
  Subdomain Enumeration CLI2024 · github.com · ▲11

  Discover and enumerate all subdomains associated with a website, including those not publicly advertised. Use this tool to conduct thorough security assessments, validate your organization's digital footprint, or enhance your reconnaissance capabilities for penetration testing and bug bounty hunting

• 
  is-a.softwareNov 2025 · is-a.software · ▲7

  Free subdomains for developers to use in their projects

• 
  Biggest Internet Domains Database2021 · domdb.com · ▲5

  All Internet Domains (199 million+) – 1Gb

• 
  Run full iOS 16.5 firmware on Android Devices▲536

  Contribute to oosexgang/hackios-xnu-kernel development by creating an account on GitHub.

  Dev tools · 5d ago · github.com

• 
  /dev/null▲503

  a social network for devs

  Dev tools · 8d ago · dev-null.sh

• 
  OpenBot▲362

  Grok Bot alternative: free, local, open-source, multiplayer

  Dev tools · 28d ago · openbot.run

• 
  Talanoa▲346

  Hi HN, I’m a fullstack developer, and honestly, I’ve lost count of how many side projects I’ve worked on over the years. But one idea kept coming back to me: a different kind of email client. It first came to me in 2014: “What if we could handle emails more like conversations?” Every year, I’d revisit this concept in my “Build Notes.” Ten years later, no one had built exactly what I had in mind — so I finally decided to do it myself. That’s how Talanoa was born. I wanted something focused on people, not timelines. I was tired of marking messages as unread just to remember to reply later, or…

  Dev tools · 26d ago · talanoa.email

• 
  myPip▲273

  Vibe code, publish, and monetize games with AI

  Dev tools · 12d ago · mypip.dev

• 
  Doneas▲272

  A daily accountability call with other entrepreneurs.

  Dev tools · 19d ago · doneas.com

• TL
  The load-bearing vocabulary of Claude▲710

  Life & fun · Aug 2026 · louisabraham.github.io

• 
  Hey Noah▲656

  A proactive AI executive assistant for founders

  AI · Aug 2026 · heynoah.io

• 
  Clipto MCP▲655

  Hey HN, We recently built Clipto. It’s a tool that lets you search over terabytes of video, audio, and images on your computer, without relying on the cloud. Motivation: we probably all had this similar experience, we know a moment exists in a video or audio, but finding it takes hours scrubbing the timeline. You can send all the media to process in the cloud, but it’s slow, expensive and raises privacy concerns. So we decided to build our own on-device media search engine. How it works (high level): 1. We ingest video, audio, image; normalize formats via ffmpeg; run content analysis to…

  Work · Aug 2026 · clipto.com

• 
  Simple algorithm and color space to generate diverse skin tones▲627

  Hello HN! I found that picking out plausible but diverse skin tones for my digital art and game development projects was kind of difficult, and I got curious about if there was a way to define a color space that made it easy. I've built a color picker and procedural generation algorithm based on the space as well as a bunch of other fun js features and demos throughout the page that use the equations. If you find it interesting, I have lots of explanations of how I built it and what properties the space has. The methodology might be a bit shaky, but hopefully the result is as helpful for…

  Life & fun · Aug 2026 · toneyalexander.github.io

• 
  AdAnt AI▲620

  Claude for viral, high-converting social ads

  AI · Aug 2026 · adant.ai

• 
  Astute▲606

  Automate your B2B brand going viral, with new media creators

  AI · Aug 2026 · company-app.joinastute.com