About protocols.page

The definitive reference for every communication protocol in computing. Built for developers. Backed by standards.

Mission

Every developer encounters protocol documentation scattered across hundreds of RFCs, vendor docs, and Wikipedia pages. protocols.page consolidates that knowledge into a single, structured, developer-friendly reference.

Every page is grounded in the original specification. Status codes cite their RFC section. Protocol behaviors trace back to the standards document. Nothing is paraphrased from secondary sources.

What we cover

Documented

Internet Protocols

HTTP, DNS, TCP, TLS, UDP, SSH, QUIC, ICMP, IP, NTP, SNMP, DHCP, BGP, gRPC

14 fully documented

Reference

HTTP Status Codes

1xx through 5xx – every standard and Cloudflare extended code with RFC citations

72 status codes

Reference

HTTP Headers

Request, response, and CORS headers with syntax, directives, and security notes

51 headers

Reference

DNS Record Types

A, AAAA, MX, CNAME, TXT, NS, SOA, DNSSEC, and more with wire format examples

20 record types

Reference

Well-known Ports

IANA-registered TCP/UDP ports with security notes and service context

36 ports

Reference

Codes & Types

HTTP status codes, DNS records, gRPC codes, HTTP headers, HTTP methods

230+ entries

Data sources

IETF RFCs

The authoritative source for internet protocol specifications.

IANA Registries

Official registries for port numbers, protocol numbers, HTTP status codes, and more.

W3C Standards

Web standards including HTTP headers, CORS, and CSP.

IEEE Standards

Ethernet, Wi-Fi (802.11), and related standards.

Open source

Found an error or want to suggest a protocol? All feedback is welcome.