TCP Handshake Simulator

Experience the SYN → SYN-ACK → ACK 3-way handshake with step-by-step animation

Related Categories:Network

Show teardown

Client

CLOSED

Server

LISTEN

→ SYN

▶

← SYN-ACK

◀

→ ACK

▶

Initial State

Client is in CLOSED state, server is in LISTEN state waiting for connections. Press Play or Step to begin the handshake.

TCP State Transition Summary

→ SYN

seq=1000

← SYN-ACK

seq=4000, ack=1001

→ ACK

ack=4001

SYN

SYN-ACK

ACK

FIN