Tutorials
Network tutorials for developers
Practical guides for checking public IPs, DNS records, SSL certificates, routes, and IP geolocation APIs.
Get your public IP from the command line
curl, wget, PowerShell, and JSON endpoints for confirming the public IP the internet sees — plus tips for proxies, scripting, and dual stack.
DNS records explained for developers
A, AAAA, CNAME, MX, TXT, NS, and how to verify them before a deployment — including TTL, propagation, and the apex-CNAME trap.
SSL certificate troubleshooting checklist
Hostname match, expiry, chain, TLS versions, redirects, and mixed content — the order to check things in when a browser warning shows up.
Use traceroute to understand network latency
How TTL hops work, why some routers time out, how to identify ISP boundaries, and when to switch from traceroute to MTR.
Build IP geolocation into your app
Calling the ipconf API from JavaScript, Node.js, Python, and Go — with practical caching, VPN handling, and privacy rules.