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diff --git a/node/MAC.hpp b/node/MAC.hpp
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+/*
+ * ZeroTier One - Global Peer to Peer Ethernet
+ * Copyright (C) 2012-2013  ZeroTier Networks LLC
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * --
+ *
+ * ZeroTier may be used and distributed under the terms of the GPLv3, which
+ * are available at: http://www.gnu.org/licenses/gpl-3.0.html
+ *
+ * If you would like to embed ZeroTier into a commercial application or
+ * redistribute it in a modified binary form, please contact ZeroTier Networks
+ * LLC. Start here: http://www.zerotier.com/
+ */
+
+#ifndef _ZT_MAC_HPP
+#define _ZT_MAC_HPP
+
+#include <stdio.h>
+#include <stdlib.h>
+#include "Array.hpp"
+#include "Constants.hpp"
+#include "Utils.hpp"
+
+namespace ZeroTier {
+
+/**
+ * An Ethernet MAC address
+ */
+class MAC : public Array<unsigned char,6>
+{
+public:
+	/**
+	 * Create a zero/null MAC
+	 */
+	MAC()
+		throw()
+	{
+		for(unsigned int i=0;i<6;++i)
+			data[i] = 0;
+	}
+
+	/**
+	 * Create a MAC consisting of only this octet
+	 *
+	 * @param octet Octet to fill MAC with (e.g. 0xff for broadcast-all)
+	 */
+	MAC(const unsigned char octet)
+		throw()
+	{
+		for(unsigned int i=0;i<6;++i)
+			data[i] = octet;
+	}
+
+	/**
+	 * Create a MAC from raw bits
+	 *
+	 * @param bits 6 bytes of MAC address data
+	 */
+	MAC(const void *bits)
+		throw()
+	{
+		for(unsigned int i=0;i<6;++i)
+			data[i] = ((const unsigned char *)bits)[i];
+	}
+
+	/**
+	 * @return True if non-NULL (not all zero)
+	 */
+	inline operator bool() const
+		throw()
+	{
+		for(unsigned int i=0;i<6;++i) {
+			if (data[i])
+				return true;
+		}
+		return false;
+	}
+
+	/**
+	 * @return True if this is the broadcast-all MAC (0xff:0xff:...)
+	 */
+	inline bool isBroadcast() const
+		throw()
+	{
+		for(unsigned int i=0;i<6;++i) {
+			if (data[i] != 0xff)
+				return false;
+		}
+		return true;
+	}
+
+	/**
+	 * @return True if this is a multicast/broadcast address
+	 */
+	inline bool isMulticast() const
+		throw()
+	{
+		return ((data[0] & 1));
+	}
+
+	/**
+	 * @return True if this is a ZeroTier unicast MAC
+	 */
+	inline bool isZeroTier() const
+		throw()
+	{
+		return (data[0] == ZT_MAC_FIRST_OCTET);
+	}
+
+	/**
+	 * Zero this MAC
+	 */
+	inline void zero()
+		throw()
+	{
+		for(unsigned int i=0;i<6;++i)
+			data[i] = 0;
+	}
+
+	/**
+	 * @param s String hex representation (with or without :'s)
+	 * @return True if string decoded into a full-length MAC
+	 */
+	inline bool fromString(const char *s)
+	{
+		std::string b(Utils::unhex(s));
+		if (b.length() == 6) {
+			for(unsigned int i=0;i<6;++i)
+				data[i] = (unsigned char)b[i];
+			return true;
+		}
+		for(unsigned int i=0;i<6;++i)
+			data[i] = 0;
+		return false;
+	}
+
+	inline std::string toString() const
+	{
+		char tmp[32];
+		sprintf(tmp,"%.2x:%.2x:%.2x:%.2x:%.2x:%.2x",(int)data[0],(int)data[1],(int)data[2],(int)data[3],(int)data[4],(int)data[5]);
+		return std::string(tmp);
+	}
+};
+
+} // namespace ZeroTier
+
+#endif