FOR DEVELOPERS
The NetSH API
Every check on netsh.io — DNS, SSL, WHOIS, mail health, and more — is also a JSON API endpoint. 23 endpoints, one consistent response contract, a free tier to build against right away.
Base URL
https://netsh.io/api/v1Authentication
An x-api-key header, or an api_key query parameter.
Free tier
300 requests/day, no credit card required.
Endpoints
23 network diagnostic checks, all under one stable v1 contract.
Try it
Every endpoint returns the same shape and works with a single curl request:
curl "https://netsh.io/api/v1/whois?domain=example.com" \ -H "x-api-key: YOUR_API_KEY"