Colasoft Capsa Network Analyzer

Portable network analyzer(packet sniffer) freeware

Freeware Network Analyzer (Packet Sniffer) for students, teachers, computer geeks and other non-commercial purposes.

Capsa Free is a network analyzer that allows you to monitor network traffic, troubleshoot network issues and analyze packets. Features include support for over 300 network protocols (including the ability to create and customize protocols), MSN and Yahoo Messenger filters, email monitor and auto-save, and customizable reports and dashboards.


Release Date: 01/19/2017
Version: 9.2
File Size: 62.8 MB

Capsa Free is a must-have freeware network analyzer for Ethernet monitoring, troubleshooting and analysis. It provides users with great experience to learn how to monitor network activities, pinpoint network problems, enhance network security and so on. Moreover, Capsa Free is a perfect choice for students, teachers and computer geeks to learn protocols and networking technology knowledge.

Why Choose Capsa Free Network Analyzer

  • Your own dashboard, important parameters in one place and in graphs
  • Record network profile, set your analysis objective and perform customized analysis.
  • Powerful customizable alarm, customize dozens of alarm trigger combinations.
  • Identify and analyze more than 300 network protocols, create and customize protocols, analyze unique protocol traffic.
  • Intuitive TCP timing sequence chart.
  • Accurate MSN & Yahoo Messenger monitoring statistics.
  • Email monitor and auto-saving Email content.
  • Enhanced, Customizable Reports.
Extended Network Security Analysis

Accurately detects DoS (DDoS) attack, Worm activity, ARP attack, TCP port scanning and suspicious conversation and locates the source and target in real-time.

Versatile Traffic & Bandwidth Statistics

Monitors Network traffic and Network bandwidth details in graphs and numbers.

Advanced Network Protocol Analysis

Being able to support more than 300 protocols, Capsa make it easy to analyze protocols in network and understand what is happening.

In-depth Packet Decoding

Capsa captures all network packets transmitted on network and displays detailed packet decoding information in Hex, ASCII and EBCDIC.

Multiple Network Behavior Monitoring

Monitors HTTP, Email, DNS, FTP, MSN and Yahoo! Messenger.

Extensive Statistics of Each Host

Lists all hosts in network with details (traffic, IP, MAC, etc.).

Automatic Expert Network Diagnosis

Automatically diagnoses network problems and suggests solutions.

Visualized Connections in Matrix

Visualizes the entire network in an ellipse, showing connections and traffic.

Powerful Conversation Analysis

Monitors all conversations and reconstruct packet stream.

Useful & Valuable Built-in Tools

Free built-in tools to create and replay packets; scan and ping IPs.

Quick & Intuitive Report

Provides various reports regarding concerned items.


Software Systems

  • Windows XP (SP 1 or later) and 64bit Edition
  • Windows Server 2003 and 64bit Edition
  • Windows Vista and 64bit Edition
  • Windows 2008 and 64bit Edition
  • Windows 7 and 64bit Edition
  • Windows 8 and 64bit Edition
  • Windows 10 and 64bit Edition
Relied Browser:
  • Internet Explorer 6.0 or higher

Hardware Requirements

Minimum Requirements:
  • CPU: P4 2.8GHz
  • RAM: 2GB
  • Internet Explorer 6.0
Recommended System:
  • CPU: Intel Core Duo 2.4GHz
  • RAM: 4GB or more
  • Internet Explorer 6.0 or higher
Supported Network
  • Ethernet

    Capsa will run with a NDIS 3 or higher compatible Ethernet, Fast Ethernet, or Gigabit promiscuous mode network adapter. Promiscuous mode is the ability to have Capsa take over the driver and put it into a mode that will allow it to passively capture all packets on an Ethernet wire, regardless of the address to which they are being sent/received.


End User License Agreement

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