N

ngrep 1.45

Jordan Ritter  ❘ Open Source

Ngrep: The Network Packet Analysis Tool That Puts You in Control

Elena Angelini

Ngrep offers a powerful way to analyze network traffic in real-time, making it an essential tool for network engineers and security professionals.
2025 Editor's Rating

ngrep is an open-source network packet analyzer that allows users to inspect network traffic based on specified criteria. Developed by Jordan Ritter, ngrep provides a simple yet powerful way to filter and analyze network packets in real time.

With ngrep, users can capture and display network traffic that matches a specified regex pattern. This makes it a valuable tool for troubleshooting network issues, monitoring network activity, and analyzing protocols. Whether you are a network administrator, developer, or security professional, ngrep provides the functionality needed to inspect packets on the fly.

One of the key features of ngrep is its ability to read pcap capture files for offline analysis. This allows users to conduct in-depth investigations by replaying captured network traffic and applying filters to focus on specific data of interest.

ngrep offers a command-line interface, making it well-suited for use in scripts and automated tasks. Users can specify complex filtering rules to extract exactly the information they need from network packets. This flexibility sets ngrep apart as a versatile tool for network analysis.

Whether you are debugging network applications, monitoring traffic for security purposes, or simply analyzing protocols, ngrep provides a lightweight yet robust solution for capturing and examining network packets. Its ease of use and powerful filtering capabilities make it a valuable addition to any network administrator's toolbox.

Overview

ngrep is a Open Source software in the category Development developed by Jordan Ritter.

The latest version of ngrep is 1.45, released on 02/18/2008. It was initially added to our database on 08/24/2007.

ngrep runs on the following operating systems: Windows.

ngrep has not been rated by our users yet.

Pros

  • ngrep is a very powerful network packet analyzer tool
  • It allows users to analyze network traffic in real-time using regular expressions
  • ngrep is open-source software, meaning it is freely available to use and modify
  • Provides the ability to analyze both inbound and outbound network traffic
  • Supports various network protocols including TCP, UDP, ICMP, and more

Cons

  • The command-line interface may be challenging for users who prefer graphical user interfaces
  • Requires a good understanding of regular expressions to effectively filter and analyze network traffic
  • Lacks advanced graphical visualization features compared to some other network analysis tools
  • May not be as user-friendly for beginners compared to other packet analyzers with more intuitive interfaces

FAQ

What is ngrep?

ngrep is a network packet analysis tool that allows you to capture and display network traffic based on various criteria.

Who developed ngrep?

ngrep was developed by Jordan Ritter.

What operating systems does ngrep support?

ngrep is available for Unix-like systems, including Linux, FreeBSD, and macOS.

What are the main features of ngrep?

Some of the main features of ngrep include pattern matching using regular expressions, protocol-specific filters, output customization, and flexible packet matching.

How does ngrep differ from tcpdump?

While tcpdump captures raw packets, ngrep focuses on capturing and displaying only packets matching specific patterns or criteria.

Can ngrep decode encrypted network traffic?

No, ngrep cannot decode encrypted network traffic. It can capture and display encrypted packets but cannot decrypt them.

What are some common use cases for ngrep?

Some common use cases for ngrep include network troubleshooting, network security analysis, protocol analysis, and monitoring specific network activity.

Is ngrep a free and open-source software?

Yes, ngrep is released under the GNU General Public License (GPL). You can freely use, modify, and distribute it.

What are the basic command-line options for using ngrep?

Some basic command-line options for using ngrep include -q (quiet mode), -W (write packets to a file), -d (specify the network interface), and -P (protocol filter).

Where can I find the official documentation for ngrep?

The official documentation for ngrep can be found at the project's website: http://ngrep.sourceforge.net/


Elena Angelini

Elena Angelini

I'm Elena, your go-to software reviewer at UpdateStar and tech enthusiast. Whether you're a user seeking the latest software titles or software news I've got you covered. When I'm not diving into the latest software, you can find me exploring nature trails, camping under the stars, or competing in online multiplayer games. My reviews are designed to be fun, engaging, and packed with all the details you need to make informed decisions.

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