# Jsmon

Startup, Worldwide.

> A free API to query 3.5B subdomains
>
> — in its own words, from subdomains.jsmon.sh

- Website: https://subdomains.jsmon.sh
- Listed since: 2026
- launched: 2026-09-10
- launch post: https://news.ycombinator.com/item?id=49642517
- hn score: 3
- Last verified: 2026-09-10


## Sources

- Hacker News, "Show HN" — https://news.ycombinator.com/item?id=49642517, read 2026-09-10

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startup.is · https://startup.is/registry/jsmon · open data: /api/v1, /llms.txt