Reference Tables

Eight filterable lookup tables covering character encoding, the web platform and CSS, generated from data so the values are complete and consistent.

A heavy reference volume open on a desk — Eight lookup tables, generated from data rather than typed by hand, so the values are the values. Photo: Arturo Añez. on Pexels

Updated: 2 August 2026Read: 3 minRuns: 100% in your browser

All reference tables

Lookup tables built from data rather than typed by hand, so the values are consistent and complete. Every table is filterable, type in the filter box to narrow hundreds of rows to the one you need.

ASCII Table

The complete ASCII character set with decimal, binary, hex, octal and HTML values.

Binary Conversion Chart (0-255)

Every value from 0 to 255 in binary, decimal, hexadecimal, octal and ASCII.

HTML Entities Reference

Named and numeric HTML character references with copy-ready code.

Unicode Blocks Reference

Unicode planes and blocks with code point ranges and UTF-8 byte lengths.

HTTP Status Codes

Every HTTP response code, what it means and how it affects SEO.

MIME Types Reference

Common media types mapped to file extensions and typical usage.

Regex Cheat Sheet

Regular expression syntax, character classes, quantifiers and lookarounds.

CSS Named Colors

All 148 CSS colour keywords with HEX, RGB and HSL values.

Which table do I need?

You are looking for…	Go to
The code for a character, or what a control character does	ASCII Table
A value in binary, hex and octal at once	Conversion Chart
How to write a symbol in HTML	HTML Entities
Which script a code point belongs to, or its UTF-8 byte count	Unicode Blocks
What a 3xx or 4xx response means for SEO	HTTP Status Codes
The right Content-Type for a file	MIME Types
Regex syntax you half remember	Regex Cheat Sheet
A CSS colour keyword and whether text will be readable on it	CSS Named Colors

For definitions rather than values, see the glossary. For explanations, see the guides.