查询IP地址是IPV4还是IPV6，查询IP的类别

查询IP地址是IPV4还是IPV6，查询IP的类别

import java.net.*;

import java.io.*;

public class IPVersion {

public static void main(String args[]) {

try {

InetAddress inetadd = InetAddress.getLocalHost();

byte[] address = inetadd.getAddress();

System.out.println(address);

if (address.length == 4) {

System.out.println("The ip version is ipv4");

int firstbyte = address[0];

if (firstbyte < 0)

firstbyte += 256;

if ((firstbyte & 0x80) == 0)

System.out.println("the ip class is A");

else if ((firstbyte & 0xC0) == 0x80)

System.out.println("The ip class is B");

else if ((firstbyte & 0xE0) == 0xC0)

System.out.println("The ip class is C");

else if ((firstbyte & 0xF0) == 0xE0)

System.out.println("The ip class is D");

else if ((firstbyte & 0xF8) == 0xF0)

System.out.println("The ip class is E");

} else if (address.length == 16)

System.out.println("The ip version is ipv6");

} catch (Exception e) {

}

;

}

}