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bigintIPAddress address = new IPAddressString("192.168.1.1").getAddress() ;System.out.println( address.getValue()  );// bigint转ipSystem.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