PHP local matching ip address class

31 Jan 2026

The Go language standard library provides a network interface information query function, but if you want to make configuration modifications, such as IP address allocation, you need to use a third-party netlink library. This article will introduce in detail how to use netlink to implement programmatic configuration of network interfaces in Go, including obtaining interfaces, constructing IP configurations, and adding IP addresses, and provide practical code examples and precautions.

11 Nov 2025

You can use the socket module to obtain the local IP. It is recommended to obtain the real LAN IP (such as 192.168.x.x) by connecting to 8.8.8.8 to avoid returning 127.0.0.1; in multi-network card environments, the netifaces library can be used to obtain all interface IPs.

29 Jan 2026

This article details how to efficiently determine whether an IP address is within a specific IP address range in the Go language. The core method is to use the net.IP type in the Go standard library net package, which represents the IP address as a big-endian byte slice, and combines it with the bytes.Compare function for direct comparison to achieve a concise and accurate range check.

10 Nov 2025

Using C to capture network packets requires relying on the libpcap or Npcap library. Open the network interface through pcap_open_live, capture the data packets with pcap_loop, parse the Ethernet and IP header information in the callback function, and extract the source and destination IP addresses. Administrator rights are required and BPF filters are configured correctly to improve performance. 1. Install libpcap-dev or Npcap; 2. Write code to register the callback function to process the original packet; 3. Link the -lpcap library when compiling.

29 Jan 2026

This article introduces how to use the middleware idea of ​​Go standard library net/http to uniformly run preprocessing functions (such as IP blacklist verification) before all HTTP handlers are executed, without modifying each routing logic.

13 Nov 2025

This tutorial aims to solve the common confusion in obtaining domain names through IP addresses in Go language. Many developers who try to use net.LookupHost for reverse resolution find that it only returns the original IP. We will delve into the correct usage of the Go standard library net package, clearly point out that the net.LookupAddr function should be used, and demonstrate through detailed example code how to efficiently and accurately resolve IP addresses into corresponding domain names, thereby realizing the reverse lookup function from IP to domain name.