Golang : Convert IPv4 address to packed 32-bit binary format



Tags : golang ip-address packed-32-bits-binary big-endian

There are times when we need to deal with low-level network functions such as dealing with C program and the IP version 4 string address format is not really suitable. The IP version 4 address needs to be converted to packed 32-bit binary format first. For example, IP address 127.0.0.1 packed to 7f000001 Below is an example on how to convert the IPv4 address to packed 32-bits with encoding/binary package. Here you go! package main import ( "bytes" "encoding/binary" "fmt" "math/big" "net" ) func IP4toInt(IPv4Address net.IP) int64 { IPv4Int := big.NewInt(0) IPv4Int.SetBytes(IPv4Address.To4()) return IPv4Int.Int64() //similar to Python's socket.inet_aton() function //https://docs.python.org/3/library/socket.html#socket.inet_aton func Pack32BinaryIP4(ip4Address string) string { ipv4Decimal := IP4toInt(net.ParseIP(ip4Address)) buf := new(bytes.Buffer) err := binary.Write(buf, binary.BigEndian, uint32(ipv4Decimal)) if err != nil { fmt.Println("Unable to write to buffer:", err) // present in hexadecimal format result := fmt.Sprintf("%x", buf.Bytes()) return result func main() { fmt.Println("IP address 127.0.0.1 packed to ", Pack32BinaryIP4("127.0.0.1")) fmt.Println("IP address 192.168.0.1 packed to ", Pack32BinaryIP4("192.168.0.1")) Output: IP address 127.0.0.1 packed to 7f000001 IP address 192.168.0.1 packed to c0a80001 Happy coding! References: https://www.socketloop.com/tutorials/golang-convert-decimal-number-integer-to-ipv4-address https://golang.org/pkg/encoding/binary/#Write https://www.socketloop.com/tutorials/golang-how-to-convert-cast-string-to-ip-address

  See also : Golang : Convert decimal number(integer) to IPv4 address



Tags : golang ip-address packed-32-bits-binary big-endian

By Adam Ng

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