All Categories

Browse protocols by category and layer. From the foundational internet protocols to emerging AI & agent protocols.

662

Total Protocols

Layers of Coverage

Internet Protocols

Layer 1

The foundational protocols that power the internet. Core networking, transport, and network layer protocols.

BGPDHCPDNSHTTPICMPIP+ 8 more

156

Protocols

2,847

Codes & Types

Application Protocols

Layer 2

High-level protocols used by applications and services. Modern protocols for web, APIs, messaging, and more.

GRPCWEBSOCKETMQTTAMQPGRAPHQLSMTP

248

Protocols

4,156

Codes & Types

Data Formats & Standards

Layer 3

Data formats, MIME types, headers, and standards that ensure interoperability.

JSONMIMECORSCSPISO-8601

198

Protocols

6,304

Codes & Types

AI & Agent Protocols

Layer 4

Protocols for AI systems, agents, and emergent intelligent communication.

MCPA2AAGENT-IDENTITYAI-GOVERNANCE

Protocols

381

Codes & Types

Future Protocols

Layer 5

Emerging and experimental protocols that define the future of communication.

QUIC-V2WEBTRANSPORTMASQUE

Protocols

127

Codes & Types

About Our Categorization

Protocols are organized into 5 layers based on the OSI model and modern computing architecture. Each protocol may span multiple layers.

Learn more about our methodology

Layer 5---Future Protocols

Layer 4---AI & Agent Protocols

Layer 3---Data Formats & Standards

Layer 2---Application Protocols

Layer 1---Internet Protocols