Developer Reference
Evergreen lookup pages for the things you google mid-task: port numbers, Content-Type strings, ASCII codes. Everything ships with the page — no lookups, no tracking of what you search.
Common TCP/UDP Port Numbers
70+ ports developers actually search — SSH, DNS, HTTPS, every mail port, every major database, Docker, Kubernetes, Prometheus — grouped by category with a live filter, plus how well-known, registered and ephemeral ranges work.
MIME Types (Content-Type) Reference
90+ file extensions mapped to their correct MIME types — documents, images, audio, video, fonts, archives, code — with a filter, and explainers on charset, multipart types and the classic Content-Type mistakes.
ASCII Table & Unicode Basics
The full ASCII table 0–127 in decimal, hex, octal and binary, control characters explained, UTF-8 encoding rules, the BOM — plus a char inspector that shows any character's code point and UTF-8 bytes.
| Tool | What it covers |
|---|---|
| HTTP Status Codes | Every 1xx–5xx status code, searchable, with plain-English debugging notes |
| Git Commands | Git command reference and cheat sheet for everyday and rescue workflows |
| Redis Commands | Redis command reference by data type, with complexity and examples |
About this section
These pages are static reference material — the kind of lookup you do twenty times a year and never memorize. All data is embedded in each page and any filtering runs locally in your browser; nothing you type is sent anywhere. If you spot an error, tell me and I'll fix it.
Looking for interactive utilities instead? Browse all free developer tools.