package test;

import java.io.ByteArrayOutputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import inet.ipaddr.IPAddress;
import inet.ipaddr.IPAddressString;
import inet.ipaddr.ipv4.IPv4Address;

public class TestIpAddr {

	public static void main(String[] args) {

		//ip转bigint
		IPAddress address = new IPAddressString("192.168.1.1").getAddress() ;
		System.out.println( address.getValue()  );
		
		// bigint转ip
		System.out.println(String.join(".",new IPv4Address(toByteArray(3232235777L)).getSegmentStrings()));

		//获取子网
		List<String> subnetList = getSubnetList("192.168.1.1/255.255.252.0");
		
		for(int i=0;i<subnetList.size() ; i++ ) {
			System.out.println(subnetList.get(i) );
		}
	}
	private static byte[] toByteArray(Long a){
        ByteArrayOutputStream bos=new ByteArrayOutputStream();
        DataOutputStream dos=new DataOutputStream(bos);
        try {
            dos.writeLong(a);
        } catch (IOException e) {
            e.printStackTrace();
        }
        return bos.toByteArray();
    }
	
	public static List <String> getSubnetList (String ipAddr){

        IPAddress address = new IPAddressString(ipAddr).getAddress();
        int prefixLength=address.toAddressString().getNetworkPrefixLength();

        List<String> subnetList = new ArrayList<String>();

        IPAddress subnet = address.applyPrefixLength(prefixLength).toPrefixBlock();
        Iterator<? extends IPAddress> iterator = subnet.iterator();
        
        while (iterator.hasNext()) {
            subnetList.add(iterator.next().toCanonicalWildcardString());
        }
        subnetList.remove(0);
        subnetList.remove(subnetList.size()-1);
        return  subnetList;
    }
    

}

jar包下载地址：

https://www.mvnjar.com/com.github.seancfoley/ipaddress/5.0.2/detail.html