Subdomains by Jsmon
Query 3.5 billion subdomains with a single API call
Details
- External ID
- 1247306
- Source
- PH
- Company
- —
- Product
- Subdomains by Jsmon
- Website domain
- producthunt.com
- Launched
- Sept. 12, 2026
- Cohort
- —
- Upvotes
- 1
- Upvotes percentile
- 0.30815693820825313
- Tags
- API, Developer Tools, Hacking
- Fetched at
- Sept. 14, 2026, 1:01 a.m.
- Updated at
- Sept. 14, 2026, 1:01 a.m.
Description
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.
Enrichment
- Theme
- OpenAI-compatible AI API gateways
- Vertical
- Security
- Function
- Dev tools
- Audience
- Developer
- AI stance
- Not AI
- Project type
- Commercial product
- Normalized one-liner
- subdomain query api
- Manually corrected
- False
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 — 78 launches clear the similarity bar, closest 8 shown.
Attention rank: #50 of 79 (itself plus its competitors, highest first — normalized so YC and Product Hunt are compared fairly).
Launched 309 days after the earliest competitor.
- 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
- I built a search engine for all domains on the internet · hn · 2025-11-07 · 5 upvotes · similarity 0.39
- D.NIX. · ph · 2026-09-20 · 2 upvotes · similarity 0.38
- digga · hn · 2026-07-02 · 6 upvotes · similarity 0.37
- seedance2.0-seedance-2.0-api · github · 2026-09-24 · 64 upvotes · similarity 0.37
- IP Geolocation API · ph · 2026-09-12 · 2 upvotes · similarity 0.37
- Notify.domains · ph · 2026-09-06 · 249 upvotes · similarity 0.37
Other launches for this product
- No other launches for this product.
Same idea, different domain
Nobody's really built a dev tools tool for Sales yet.