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Subdomain Finder API (Jsmon)

subdomains.jsmon.sh
Visit subdomains.jsmon.sh
Category
Cybersecurity
Rank
No. 2480Tools index

Previous survey · No. 2372 ·

Pricing
Freemium
Type
TOOL
Use case
Security & Identity
Interfaces
API
Date

About

An API that returns every publicly observed subdomain for a given domain, drawing from a database of 3.5 billion subdomains sourced from certificate transparency logs, DNS records, and web crawling. It targets security researchers, red teams, and bug bounty hunters, with a free tier (3 queries/day) and paid tiers up to 50,000 queries/month.

What it does

The landing page frames this as a lookup service: sign up, grab an API key, then send a domain name and get back a list of subdomains discovered from public sources. It's presented as a narrower tool than Jsmon's broader attack-surface platform, which adds vulnerability and secret scanning on top.

Stated on the product site

Pricing
Pricing is tiered by monthly query volume, with a paid Pro tier at $20 a month for a set query allowance.
Interface
The product is built around a single GET request per domain lookup rather than a dashboard or bulk upload flow.
Data sourcing
The site states subdomain data is collected from certificate transparency logs, DNS records, web crawling, and other OSINT sources, updated daily.
Product scope
The page distinguishes this API from Jsmon's broader platform, describing this product specifically as a focused subdomain lookup tool.

Not stated on the site

  • The page does not name the company or team operating the service beyond the Jsmon brand.
  • Exact update mechanics beyond being 'updated daily' and observing subdomains within '24-48 hours' are not detailed.
  • Annual billing is mentioned as not yet offered, but no timeline is given for when it might launch.
  • The page shows only one truncated JSON sample, so the full response schema is not described.

Written from the product site at subdomains.jsmon.sh.

What it can do

  • Return all publicly observed subdomains for a given domain

    Domain name → List of subdomains

Tags

subdomain-enumerationosintapibug-bountyattack-surfacereconsecurity

Media

Subdomain Finder API (Jsmon)

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Editorially curated, with community endorsements as a secondary signal. Corrections welcome.