TCP State Machine
Interactive visualization of the Transmission Control Protocol (TCP) connection lifecycle, including the 3-way handshake, data transmission, and 4-way teardown.
Client
CLOSED
TCB (Transmission Control Block)
SEQ: 0
ACK: 0
WIN: 64240
Server
LISTEN
TCB (Transmission Control Block)
SEQ: 0
ACK: 0
WIN: 64240
Event Log
> System initialized. Server in LISTEN state.