Award-winning free utility to send & receive network packets. TCP, UDP, SSL.


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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.

Download the full version. Free.

Packet Sender is open source. It will always be free.

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