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diff --git a/datarouter-node/src/main/java/org/onap/dmaap/datarouter/node/SubnetMatcher.java b/datarouter-node/src/main/java/org/onap/dmaap/datarouter/node/SubnetMatcher.java
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--- /dev/null
+++ b/datarouter-node/src/main/java/org/onap/dmaap/datarouter/node/SubnetMatcher.java
@@ -0,0 +1,71 @@
+/*******************************************************************************
+ * ============LICENSE_START==================================================
+ * * org.onap.dmaap
+ * * ===========================================================================
+ * * 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.dmaap.datarouter.node;
+
+import java.net.*;
+
+/**
+ *	Compare IP addresses as byte arrays to a subnet specified as a CIDR
+ */
+public class SubnetMatcher	{
+	private byte[]	sn;
+	private int	len;
+	private int	mask;
+	/**
+	 *	Construct a subnet matcher given a CIDR
+	 *	@param subnet	The CIDR to match
+	 */
+	public SubnetMatcher(String subnet) {
+		int i = subnet.lastIndexOf('/');
+		if (i == -1) {
+			sn = NodeUtils.getInetAddress(subnet);
+			len = sn.length;
+		} else {
+			len = Integer.parseInt(subnet.substring(i + 1));
+			sn = NodeUtils.getInetAddress(subnet.substring(0, i));
+			mask = ((0xff00) >> (len % 8)) & 0xff;
+			len /= 8;
+		}
+	}
+	/**
+	 *	Is the IP address in the CIDR?
+	 *	@param addr the IP address as bytes in network byte order
+	 *	@return true if the IP address matches.
+	 */
+	public boolean matches(byte[] addr) {
+		if (addr.length != sn.length) {
+			return(false);
+		}
+		for (int i = 0; i < len; i++) {
+			if (addr[i] != sn[i]) {
+				return(false);
+			}
+		}
+		if (mask != 0 && ((addr[len] ^ sn[len]) & mask) != 0) {
+			return(false);
+		}
+		return(true);
+	}
+}