Network Protocol Visualizer

Step through animated sequence diagrams of TCP, HTTP, DNS, TLS, and UDP. Inspect packet headers and see which OSI layers are active at each step.

OSI Model

7. Application

6. Presentation

5. Session

4. Transport

3. Network

2. Data Link

1. Physical

Client initiates connection by sending a SYN segment with an initial sequence number (ISN).

Speed

Step 1 / 4

Packet Inspector

Transport Layer

Source Port	49152
Dest Port	80
Seq Number	100
Ack Number	0
Flags	SYN
Window Size	65535
Checksum	0x7f3a

Network Layer

Source IP	192.168.1.10
Dest IP	93.184.216.34
TTL	64
Protocol	TCP (6)

Use arrow keys or the step controls to navigate. Click any arrow in the diagram to inspect its packet headers. All visualization runs entirely in your browser.