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Table of Contents
The basic way to scan the network
Using the concurrency advantages of Go to improve efficiency
Library selection and usage suggestions
Precautions and compliance issues
Home Backend Development Golang Go Network Scanner Development

Go Network Scanner Development

Jul 17, 2025 am 03:30 AM
php java programming

There are four core points to develop a Go network scanner: 1. Select suitable libraries such as net and gopacket; 2. Understand the underlying protocols such as ICMP, TCP, SYN, and UDP; 3. Use goroutine and channel to design concurrency mechanisms and control quantity; 4. Ensure scanning compliance to avoid abuse. The basic methods of network scanning include ICMP detection host survival, TCP/SYN/UDP port detection, etc. Go's net library can implement basic scanning, and gopacket supports original packet operation. Efficiency can be improved by limiting the number of goroutines combined with WaitGroup and buffered channels. Notes include legal authorization, rate control, avoiding large-scale public network scanning, and providing disclaimers to ensure compliance.

Go Network Scanner Development

If you plan to develop a Go network scanner, there are several core points to grasp: selecting the right library, understanding the underlying protocol, designing a reasonable concurrency mechanism, and ensuring compliance with scanning behavior. This is not just a matter of writing a few lines of code, but a certain understanding of network communication and performance optimization.

Go Network Scanner Development

The basic way to scan the network

The core of network scanning is to detect whether the target host survives, which ports are opened, what services are running, etc. Common scanning methods include:

  • ICMP scan : determine whether the host is online by sending an ICMP Echo request.
  • TCP scan : Try to establish a TCP connection with the target port to determine whether the port is open.
  • SYN scan (half-open scan) : Send SYN packets and listen for responses, without completing three handshakes, it is more concealed.
  • UDP scanning : It is suitable for UDP service detection, but it is not very stable due to the high packet loss rate.

To implement these functions in Go, you can use net standard library for basic operations, such as net.DialTimeout to implement TCP scanning. If you want to have a more underlying control, such as constructing original data packets, you need to use third-party libraries such as gopacket or afpacket .

Go Network Scanner Development

Using the concurrency advantages of Go to improve efficiency

One of Go's biggest advantages is its concurrency model. High-performance scanners can be easily implemented with goroutine and channel.

To give a simple example: if you want to scan multiple ports of an IP, you can perform the detection task of each port as a goroutine and pass the results back through the channel. This can greatly improve the scanning speed and the code structure is also clear.

Go Network Scanner Development

However, it should be noted that the number of goroutines cannot grow unlimitedly, otherwise it may cause resource exhaustion or banned by the target system. It is recommended to use sync.WaitGroup and buffered channel to control the concurrency number.

You can do this:

  • Define a maximum number of concurrencies, such as 100
  • Use a buffered channel as the semaphore
  • Every time a goroutine is started, a "license" is obtained from the channel and released after completion.

Library selection and usage suggestions

The Go community already has some good network scanning related libraries. Here are a few commonly used recommendations:

  • net : Standard library, suitable for TCP/UDP basic scanning.
  • gopacket : is used to process raw network packets, suitable for advanced scanning (such as SYN scanning).
  • masscan binding library : If you need the ultimate scanning speed, you can consider encapsulating masscan tools.
  • nmap calling interface : If you don't want to recreate the wheel, you can directly call the nmap command and parse the output.

Which library to choose depends on your needs. If you are just making a small intranet scanning tool, using net is enough; if you want to make an enterprise-level scanner, you may need to use gopacket to build a complete custom protocol stack.

Precautions and compliance issues

When developing network scanners, in addition to technical issues, you should also pay attention to the following points:

  • Do not enable "Silent Mode" or "Hide Scan Traces" by default. Legal use is the most important thing.
  • Avoid large-scale public network scanning and prevent being mistaken for attacks.
  • Add delay or rate control options to the program to avoid triggering firewall rules.
  • Provide clear user prompts that the tool is only available within the scope of authorization.

Many security tools are held accountable due to abuse, so you must add a disclaimer before publishing and encourage users to abide by laws and regulations.


Basically that's it. Go is a language that is very suitable for writing network tools, but although it is not technically difficult to develop network scanners, there are still many details that need to be paid attention to in actual applications.

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