Subdomains by Jsmon
Query 3.5 billion subdomains with a single API call
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curl -H 'API-Key' https://subdomains.jsmon.sh/api/domain/example.com The world's largest subdomain intelligence API. Sign up, get an API key, and start querying any domain — for free. Built for bug bounty hunters, red teams, and security researchers. One GET request. Every subdomain ever observed.
PH · launched Sep 12, 2026 · 1 upvote (top 69%) · 0 views
Niche: cyber threat intelligence platforms · 66 launches, 4 in the last 7 days ▼ -56% · Explore this niche →
Category and tags
- Security
- Data infrastructure
- Developer
- Not AI
- Commercial product
- API
- Developer Tools
- Hacking
Visit website ↗ Source listing ↗
More like this: all 66 launches in cyber threat intelligence platforms →
Could you build this?
No Aggregating, maintaining, and querying an active database of 3.5 billion subdomains with sub-100ms response times requires massive distributed internet-scale crawling, multi-terabyte DNS/Certificate Transparency log data ingestion pipelines, and specialized search infrastructure.
What it would actually take: The architecture requires high-throughput streaming pipelines (Kafka, Apache Flink) consuming global Certificate Transparency (CT) logs, rapid DNS scanners (massdns/amass clusters), and petabyte-scale columnar or key-value stores (e.g., ClickHouse, ScyllaDB, or RocksDB on NVMe arrays) optimized for suffix/prefix domain index searches. Building and operating this requires dedicated network engineering, petabyte-scale data infrastructure, and constant anti-abuse management across cloud providers.
Competitors
Other products that read as similar to this one : 131 launches clear the similarity bar, closest 8 shown.
Attention rank: #100 of 132 (itself plus its competitors, highest first, normalized so YC and Product Hunt are compared fairly).
Launched 309 days after the earliest competitor.
- Intent · ph · 2026-11-01 · 1 upvotes · similarity 0.53
- A free curl API for IP data (we scan the IPv4 space in <24h) · hn · 2026-07-29 · 10 upvotes · similarity 0.49
- Domain Intelligence API · ph · 2026-09-24 · 1 upvotes · similarity 0.46
- HugeDomains · ph · 2026-11-01 · 1 upvotes · similarity 0.46
- API.SH · ph · 2026-11-10 · 1 upvotes · similarity 0.44
- domain search · ph · 2026-10-24 · 1 upvotes · similarity 0.42
- free-subdomain-aiclub-ai-id · github · 2026-10-23 · 24 upvotes · similarity 0.41
- I built a search engine for all domains on the internet · hn · 2025-11-07 · 5 upvotes · similarity 0.40
The niche, labels, vibe code rating and competitor comparison on this page are analysis by Nicheloom. If you use them, please credit nicheloom.com. How you may use our data.