Features

Packet Sender can send and receive UDP, TCP, and SSL on the ports of your choosing.
All servers and clients may run simultaneously.

100% Free

Open source .
No Ads. No bundles.

Client/Server

Send & Receive.
UDP, TCP, or SSL.

ASCII or HEX

Any data can be defined.

Cross-platform

Windows, Mac, Linux.

Command Line

For automation / scripting

Persistent TCP and SSL

Stay connected.
Server & Client.

Common Uses

Packet Sender was designed to be very easy to use while still providing enough features for power users.

• Test automation

Using its command line tool or hotkeys

• Testing network APIs

Using the built-in UDP / TCP / SSL clients

• Malware analysis

using the built-in UDP / TCP / SSL servers

• Testing network connectivity/firewalls

by having 2 Packet Senders talk to each other

• Tech support

by sending customers a portable Packet Sender with pre-defined settings and packets

• Security research

Send SSL and then analyze the traffic log.

Screenshots

Windows XP through 10
Mac OS X (x64 Intel)
Linux Desktop (with Qt)
Command Line comes with all versions
More screenshots can be found in the documentation.