golang int to IP

In Golang, we often need to convert an integer type IP address to a string type IP address, or conversely, convert a string type IP address to an integer type IP address.

Golang provides convenient library functions to achieve this conversion. IP conversion from integer type to string type and from string type to integer type can be completed using the following functions and methods.

Convert an IP address of integer type to an IP address of string type:

func IntToIP(ip uint32) net.IP {
    return net.IPv4(byte(ip>>24), byte(ip>>16), byte(ip>>8), byte(ip))
}

This function converts an unsigned integer IP address (uint32) to an IPv4 address and returns a net.IP type structure. We can convert the IP address to a string type by using the String() method.

Usage example:

ip := uint32(3232235876) // 对应IP地址为192.168.1.100
ipAddr := IntToIP(ip)
fmt.Println(ipAddr.String()) // output: "192.168.1.100"

Convert a string type IP address to an integer type IP address:

func IPToInt(ip net.IP) uint32 {
    return binary.BigEndian.Uint32(ip.To4())
}

This function accepts an IP address (net.IP type) As a parameter, and returns the corresponding unsigned integer type (uint32). Inside the function, we use the binary.BigEndian.Uint32() function to convert the IPv4 address to a 32-bit unsigned integer.

Usage example:

ipStr := "192.168.1.100"
ipAddr := net.ParseIP(ipStr)
ipInt := IPToInt(ipAddr)
fmt.Println(ipInt) // output: 3232235876

Summary:

In this article, we discussed converting integer type IP address to string type IP address in Golang and a method to convert an IP address of string type to an IP address of integer type. We used the net.IP type and binary.BigEndian.Uint32() function provided by Golang to achieve this conversion. This is a very common operation in network programming and system management. These functions and methods can make Golang development more convenient and efficient.

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