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diff --git a/core/src/main/java/org/onap/aaf/cadi/util/NetMask.java b/core/src/main/java/org/onap/aaf/cadi/util/NetMask.java
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+/*******************************************************************************
+ * ============LICENSE_START====================================================
+ * * org.onap.aaf
+ * * ===========================================================================
+ * * Copyright © 2017 AT&T Intellectual Property. All rights reserved.
+ * * ===========================================================================
+ * * Licensed under the Apache License, Version 2.0 (the "License");
+ * * you may not use this file except in compliance with the License.
+ * * You may obtain a copy of the License at
+ * *
+ * * http://www.apache.org/licenses/LICENSE-2.0
+ * *
+ * * Unless required by applicable law or agreed to in writing, software
+ * * distributed under the License is distributed on an "AS IS" BASIS,
+ * * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * * See the License for the specific language governing permissions and
+ * * limitations under the License.
+ * * ============LICENSE_END====================================================
+ * *
+ * * ECOMP is a trademark and service mark of AT&T Intellectual Property.
+ * *
+ ******************************************************************************/
+package org.onap.aaf.cadi.util;
+
+/*
+ * NetMask - a class to quickly validate whether a given IP is part of a mask, as defined by bytes or standard String format.
+ *
+ * Needs the IPV6 Mask Builder.
+ */
+public class NetMask {
+ private long mask;
+
+ public NetMask(byte[] inBytes) {
+ mask = derive(inBytes);
+ }
+
+ public NetMask(String string) throws MaskFormatException {
+ mask = derive(string,true);
+ }
+
+ public boolean isInNet(byte[] inBytes) {
+ long addr = derive(inBytes);
+ return (mask & addr) == addr;
+ }
+
+ public boolean isInNet(String str) {
+ long addr;
+ try {
+ addr = derive(str,false);
+ return (mask & addr) == addr;
+ } catch (MaskFormatException e) {
+ // will not hit this code;
+ return false;
+ }
+ }
+
+ public static long derive(byte[] inBytes) {
+ long addr = 0L;
+ int offset = inBytes.length*8;
+ for(int i=0;i<inBytes.length;++i) {
+ addr&=(inBytes[i]<<offset);
+ offset-=8;
+ }
+ return addr;
+ }
+
+ public static long derive(String str, boolean check) throws MaskFormatException {
+ long rv=0L;
+ int idx=str.indexOf(':');
+ int slash = str.indexOf('/');
+
+ if(idx<0) { // Not IPV6, so it's IPV4... Is there a mask of 123/254?
+ idx=str.indexOf('.');
+ int offset = 24;
+ int end = slash>=0?slash:str.length();
+ int bits = slash>=0?Integer.parseInt(str.substring(slash+1)):32;
+ if(check && bits>32) {
+ throw new MaskFormatException("Invalid Mask Offset in IPV4 Address");
+ }
+ int prev = 0;
+ long lbyte;
+ while(prev<end) {
+ if(idx<0) {
+ idx = end;
+ }
+ lbyte = Long.parseLong(str.substring(prev, idx));
+ if(check && (lbyte>255 || lbyte<0)) {
+ throw new MaskFormatException("Invalid Byte in IPV4 Address");
+ }
+ rv|=lbyte<<offset;
+ prev = ++idx;
+ idx=str.indexOf('.',prev);
+ offset-=8;
+ }
+ rv|=0x00000000FFFFFFFFL>>bits;
+ }
+ return rv;
+ }
+
+}