Golang common function address resolution guide

The key functions for parsing addresses in the Go language include: net.ParseIP(): Parse IPv4 or IPv6 addresses. net.ParseCIDR(): Parse CIDR tags. net.ResolveIPAddr(): Resolve hostname or IP address into IP address. net.ResolveTCPAddr(): Resolve hostnames and ports into TCP addresses. net.ResolveUDPAddr(): Resolve hostnames and ports into UDP addresses.

GoLang Common Function Address Resolution Guide

In the Go language, address resolution is a basic operation in network programming. This article will introduce commonly used functions in the Go language to parse addresses, and provide practical cases to demonstrate how to use these functions.

Core functions

• net.ParseIP(): Parse a string into an IPv4 or IPv6 address. Usage: ip := net.ParseIP("192.168.0.1")
• net.ParseCIDR(): Parse the string into a CIDR tag, including IP Address and mask length. Usage: cidr := net.ParseCIDR("192.168.0.0/24")
• net.ResolveIPAddr(): Resolve the host name or IP address into a IP address. Usage: addr, err := net.ResolveIPAddr("ip", "google.com")
• net.ResolveTCPAddr(): Resolve the host name and port is a TCP address. Usage: addr, err := net.ResolveTCPAddr("tcp", "google.com:80")
• net.ResolveUDPAddr(): and ResolveTCPAddr() Similar, but for UDP addresses. Usage: addr, err := net.ResolveUDPAddr("udp", "google.com:80")

##Actual case

Case 1: Parsing IPv4 address

package main

import (
    "fmt"
    "net"
)

func main() {
    ip := net.ParseIP("192.168.0.1")
    fmt.Printf("IP: %v\n", ip)
}

Output:

IP: 192.168.0.1

Case 2: Parsing CIDR tag

package main

import (
    "fmt"
    "net"
)

func main() {
    cidr := net.ParseCIDR("192.168.0.0/24")
    fmt.Printf("CIDR: %v\n", cidr)
}

Output:

CIDR: 192.168.0.0/24

Case 3: Resolving hostname

package main

import (
    "fmt"
    "net"
)

func main() {
    addr, err := net.ResolveIPAddr("ip", "google.com")
    if err != nil {
        fmt.Printf("Error: %v\n", err)
    } else {
        fmt.Printf("IP: %v\n", addr.IP)
    }
}

Output:

IP: 172.217.2.142

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