golang hostname to ip

golang hostname to ip

In network communication, we often need to obtain the corresponding IP address through the domain name in order to communicate. In Golang, obtaining the IP address can be achieved by resolving the host name or domain name.

The net package in Golang provides some functions to obtain IP addresses, including functions for resolving host names. With the net.LookupHost function we can convert a hostname to multiple IPv4 or IPv6 addresses. The sample code is as follows:

package main

import (
    "fmt"
    "net"
)

func main() {
    // 通过主机名解析IP地址
    addresses, err := net.LookupHost("example.com")
    if err != nil {
        fmt.Println("解析错误：", err.Error())
        return
    }

    // 打印解析到的IP地址
    for _, address := range addresses {
        fmt.Println(address)
    }
}

When the code is run, all IPv4 and IPv6 addresses corresponding to example.com will be output. It should be noted that since one host name can correspond to multiple addresses, an address slice is returned.

If we only want to get the IPv4 or IPv6 address, we can use the net.LookupIP function. This function returns an IP slice where each IP address is a separate structure type. The sample code is as follows:

package main

import (
    "fmt"
    "net"
)

func main() {
    // 通过主机名解析IPv6地址
    ips, err := net.LookupIP("ipv6.google.com")
    if err != nil {
        fmt.Println("解析错误：", err.Error())
        return
    }

    // 打印解析到的IPv6地址
    for _, ip := range ips {
        if ip.To4() == nil {
            fmt.Println(ip)
        }
    }
}

When the code is run, all IPv6 addresses corresponding to ipv6.google.com will be output. It should be noted that ip.To4() == nil is used to determine whether the IP address is IPv6.

In actual development, we must have encountered the need to obtain IP through host name. The net package provided in Golang provides a very efficient and convenient function to facilitate network communication.

In general, the method of obtaining IP address in Golang is relatively simple. As long as we deepen our understanding of the net package and combine it with actual needs, we will be able to use this function well in the project.

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