netcheck

Network diagnostics tool — check DNS records, SSL certificates, HTTP status, open ports, and IP geolocation from the browser.

Live: netcheck-production.up.railway.app

Features

Tool	Description
DNS Lookup	A, AAAA, MX, NS, TXT, CNAME records
SSL Check	Certificate validity, issuer, expiry, days remaining
HTTP Check	Status code, response time, redirect chain, server header
Port Scan	13 common ports (SSH, HTTP, HTTPS, MySQL, Redis, ...)
IP Info	Geolocation, ASN, timezone, coordinates

Stack

• Backend: Python, FastAPI, dnspython, httpx
• Frontend: Vanilla JS, Tailwind CSS (CDN)
• Deployment: Railway (Docker)

Run locally

pip install -r requirements.txt
uvicorn main:app --reload
# → http://localhost:8000

Deploy to Railway

1. Connect this repo on railway.app
2. Railway auto-detects the Dockerfile and deploys
3. Done — get your public URL

API

All endpoints return JSON and are publicly accessible.

GET /api/dns/{domain}       DNS records
GET /api/ssl/{host}         SSL certificate info
GET /api/http?url={url}     HTTP check
GET /api/ports/{host}       Port scan (common ports)
GET /api/ip/{ip}            IP geolocation