madan712 · September 21, 2013 16:21 · Sep 21, 2013
diff --git a/IPRangeChecker.java b/IPRangeChecker.java
@@ -0,0 +1,36 @@
+import java.net.InetAddress;
+import java.net.UnknownHostException;
+
+public class IPRangeChecker {
+
+  public static long ipToLong(InetAddress ip) {
+		byte[] octets = ip.getAddress();
+		long result = 0;
+		for (byte octet : octets) {
+			result <<= 8;
+			result |= octet & 0xff;
+		}
+		return result;
+	}
+
+	public static boolean isValidRange(String ipStart, String ipEnd,
+			String ipToCheck) {
+		try {
+			long ipLo = ipToLong(InetAddress.getByName(ipStart));
+			long ipHi = ipToLong(InetAddress.getByName(ipEnd));
+			long ipToTest = ipToLong(InetAddress.getByName(ipToCheck));
+			return (ipToTest >= ipLo && ipToTest <= ipHi);
+		} catch (UnknownHostException e) {
+			e.printStackTrace();
+			return false;
+		}
+	}
+
+	public static void main(String[] args) {
+
+		System.out.println(isValidRange("122.170.122.0", "122.170.122.255",
+				"122.170.122.215"));
+
+	}
+
+}