Reference
Lookup tables you can check without opening a spec: HTTP status codes, TCP/UDP ports, the ASCII table, HTML entities, and emoji shortcodes — each with notes worth having.
5 tools
Reference
-
HTTP Status Code Reference
Search HTTP status codes by number, phrase, category, source, and troubleshooting context for APIs, websites, proxies, CDNs, redirects, authentication errors, rate limits, and gateway failures.
Open tool -
Port Reference
Search common TCP and UDP ports by number, protocol, service name, risk level, and exposure guidance for network configuration, firewall review, debugging, and security auditing.
Open tool -
ASCII Table
A complete, searchable ASCII and Latin-1 reference with decimal, hex, octal, binary, glyph, HTML entity, escape sequence, and plain-language explanations for every control character.
Open tool -
HTML Entity Reference
A searchable grid of every HTML named character reference, deduplicated to one card per character, with the glyph, code point, and one-click copy of the name, character, or numeric reference.
Open tool -
Emoji Cheat Sheet
A searchable cheat sheet of 1,870 emoji with GitHub shortcodes, names, tags, and code points, plus one-click copy of the emoji, shortcode, Unicode, or HTML entity.
Open tool
About this category
Some answers you just need to look up. Which HTTP status code is right for a stale resource? What port does PostgreSQL listen on? Which well-known ports should never be exposed to the public internet? What is the hex value for a backspace? What is the entity name for a non-breaking space? What is the shortcode for that emoji?
These references answer those questions in a few seconds, and give you more than a bare number or name: status codes come with common scenarios and recommended fixes, ports with protocol notes and exposure risk, code points and entities with every base and a copyable form — and each entry traces back to the standard it came from.
What you can do here
-
HTTP status reference
Every HTTP status code with a one-line meaning, common scenarios, recommended fixes, retry semantics, and links to the spec.
-
TCP/UDP port reference
Well-known and registered ports with the service they belong to, protocol notes, risk level, and exposure recommendations.
-
ASCII and HTML entities
All 128 ASCII code points plus the Latin-1 extension, each with its decimal, hex, octal, and binary value, its glyph, and a C escape where one exists — alongside more than fifteen hundred HTML entities, grouped by category and ready to copy.
-
Emoji shortcodes
More than eighteen hundred emoji across nine categories, searchable, with the emoji itself, its GitHub shortcode, code point, or HTML entity a click away.