What is Wireshark?

Wireshark is the world’s most popular network protocol analyzer. It is used for troubleshooting, analysis, development and education.

What’s New

Bug Fixes

A regression in the TCP Stream Graph "Time Sequence (tcptrace)" receive window line behavior introduced in 4.0.15 and 4.2.5 has been fixed. Issue 19846

The following vulnerability has been fixed:

The following bugs have been fixed:

  • RADIUS dissector’s dictionary loading broken in many ways. Issue 6466.

  • 3.4 → 3.6.5 ASCII display is broken on CentOS 7. Issue 18096.

  • Funnel/Lua: Closing child window disconnects buttons of parent. Issue 18386.

  • SPRT parser crash. Issue 19559.

  • TCP Stream Graphs green sliding window line not displayed correctly. Issue 19846.

  • Wireshark window doesn’t fully fit on screen on small resolutions and can’t be resized properly on Russian language. Issue 19861.

  • Wireshark expects wrong length for DHCP Relay Agent Information Source Port Suboption. Issue 19909.

New and Updated Features

There are no new or updated features in this release.

New Protocol Support

There are no new protocols in this release.

Updated Protocol Support


New and Updated Capture File Support


Updated File Format Decoding Support

There is no updated file format support in this release.

Prior Versions

This document only describes the changes introduced in Wireshark 4.0.16. You can find release notes for prior versions at the following locations:

Getting Wireshark

Wireshark source code and installation packages are available from https://www.wireshark.org/download.html.

Vendor-supplied Packages

Most Linux and Unix vendors supply their own Wireshark packages. You can usually install or upgrade Wireshark using the package management system specific to that platform. A list of third-party packages can be found on the download page on the Wireshark web site.

File Locations

Wireshark and TShark look in several different locations for preference files, plugins, SNMP MIBS, and RADIUS dictionaries. These locations vary from platform to platform. You can use Help  About Wireshark  Folders or tshark -G folders to find the default locations on your system.

Getting Help

The User’s Guide, manual pages and various other documentation can be found at https://www.wireshark.org/docs/

Community support is available on Wireshark’s Q&A site and on the wireshark-users mailing list. Subscription information and archives for all of Wireshark’s mailing lists can be found on the web site.

Bugs and feature requests can be reported on the issue tracker.

You can learn protocol analysis and meet Wireshark’s developers at SharkFest.

How You Can Help

The Wireshark Foundation helps as many people as possible understand their networks as much as possible. You can find out more and donate at wiresharkfoundation.org.

Frequently Asked Questions

A complete FAQ is available on the Wireshark web site.