Network tools.
// Quiet utilities for the everyday network questions — what’s my IP, is this a /24 or a /27, what runs on port 8080, what does 422 mean. No signup, no tracking, no ad interruptions on the calculator itself.
// ALL NETWORK TOOLS
What is my IP
/whats-my-ip →Your public IPv4/IPv6 address plus the request metadata your browser sends.
// No input needed — just open the page.
Network Class Lookup
/network-class →Classify an IPv4 address — Class A/B/C/D/E plus public/private/loopback flags.
// e.g. 10.0.0.1 → Class A, RFC 1918 private.
CIDR / Subnet Calculator
/cidr-calculator →Network address, broadcast, mask, wildcard, host range, and a binary breakdown.
// e.g. 192.168.1.0/24 → 254 usable hosts, mask 255.255.255.0.
Port Number Lookup
/port-lookup →Find a TCP/UDP service by port number or vice versa. Well-known + common dev ports.
// e.g. 5432 → PostgreSQL.
HTTP Status Codes
/http-status-codes →Searchable reference for every HTTP status — RFC 9110, WebDAV, Cloudflare 5xx.
// e.g. 422 → Unprocessable Content.
Built for the everyday.
These are the tools you reach for when something’s broken at 11pm — when you need to confirm your public IP because a corporate firewall is blocking you, when you can’t remember if a /27 has 30 or 32 hosts, when an API returns a 502 and you want to triple-check it’s upstream and not your code.
// THE PHILOSOPHY
- Client-side first. CIDR math, status codes, port lookup all run in your browser. No round-trips, no rate limits.
- One server endpoint. Only "What is my IP" needs the server (to read your request headers). Nothing else phones home.
- No history, no logs. Your inputs stay in your browser. We don’t track which IPs you look up or which subnets you carve.
- Practical over pedantic. Port lookup includes 3000/8080/8000 for dev servers, even though IANA hasn’t blessed them. HTTP codes include Cloudflare’s 5xx range and the Teapot.
// MORE COMING
We’re thinking about: MAC address vendor lookup (OUI database), IP-to-binary converter, MAC address generator, UUID generator, JWT decoder, DNS lookup (via DoH), and an HTTP headers viewer. If there’s one you want, send a note via contact.