Index: src/OFSystemInfo+NetworkInterfaces.h
==================================================================
--- src/OFSystemInfo+NetworkInterfaces.h
+++ src/OFSystemInfo+NetworkInterfaces.h
@@ -39,10 +39,17 @@
  *
  * This maps to an @ref OFNumber.
  */
 extern OFNetworkInterfaceKey OFNetworkInterfaceIndex;
 
+/**
+ * @brief The hardware address of a network interface.
+ *
+ * This maps to an @ref OFData.
+ */
+extern OFNetworkInterfaceKey OFNetworkInterfaceHardwareAddress;
+
 /**
  * @brief The IPv4 addresses of a network interface.
  *
  * This maps to an @ref OFData of @ref OFSocketAddress.
  */

Index: src/OFSystemInfo+NetworkInterfaces.m
==================================================================
--- src/OFSystemInfo+NetworkInterfaces.m
+++ src/OFSystemInfo+NetworkInterfaces.m
@@ -16,10 +16,12 @@
 #include "config.h"
 
 #import "OFSystemInfo.h"
 
 OFNetworkInterfaceKey OFNetworkInterfaceIndex = @"OFNetworkInterfaceIndex";
+OFNetworkInterfaceKey OFNetworkInterfaceHardwareAddress =
+    @"OFNetworkInterfaceHardwareAddress";
 OFNetworkInterfaceKey OFNetworkInterfaceIPv4Addresses =
     @"OFNetworkInterfaceIPv4Addresses";
 #ifdef OF_HAVE_IPV6
 OFNetworkInterfaceKey OFNetworkInterfaceIPv6Addresses =
     @"OFNetworkInterfaceIPv6Addresses";

Index: src/platform/Windows/OFSystemInfo+NetworkInterfaces.m
==================================================================
--- src/platform/Windows/OFSystemInfo+NetworkInterfaces.m
+++ src/platform/Windows/OFSystemInfo+NetworkInterfaces.m
@@ -90,10 +90,19 @@
 			}
 
 			index = [OFNumber numberWithUnsignedInt: iter->IfIndex];
 			[interface setObject: index
 				      forKey: OFNetworkInterfaceIndex];
+
+			if (iter->PhysicalAddressLength > 0) {
+				const OFNetworkInterfaceKey key =
+				    OFNetworkInterfaceHardwareAddress;
+				OFData *address = [OFData
+				    dataWithItems: iter->PhysicalAddress
+					    count: iter->PhysicalAddressLength];
+				[interface setObject: address forKey: key];
+			}
 
 			for (PIP_ADAPTER_UNICAST_ADDRESS_LH addrIter =
 			    iter->FirstUnicastAddress; addrIter != NULL;
 			    addrIter = addrIter->Next) {
 				OFSocketAddress address;
@@ -181,11 +190,11 @@
 		for (PIP_ADAPTER_INFO iter = adapterInfo; iter != NULL;
 		    iter = iter->Next) {
 			OFMutableDictionary *interface;
 			OFString *name, *IPString;
 			OFNumber *index;
-			OFSocketAddress address;
+			OFSocketAddress IPv4Address;
 			OFData *addresses;
 
 			name = [OFString stringWithCString: iter->AdapterName
 						  encoding: encoding];
 
@@ -195,23 +204,32 @@
 			}
 
 			index = [OFNumber numberWithUnsignedInt: iter->Index];
 			[interface setObject: index
 				      forKey: OFNetworkInterfaceIndex];
+
+			if (iter->AddressLength > 0) {
+				const OFNetworkInterfaceKey key =
+				    OFNetworkInterfaceHardwareAddress;
+				OFData *address = [OFData
+				    dataWithItems: iter->Address
+					    count: iter->AddressLength];
+				[interface setObject: address forKey: key];
+			}
 
 			IPString = [OFString
 			    stringWithCString: iter->IpAddressList.IpAddress
 						   .String
 				     encoding: encoding];
 
 			if ([IPString isEqual: @"0.0.0.0"])
 				continue;
 
-			address = OFSocketAddressParseIPv4(IPString, 0);
-			addresses = [OFData dataWithItems: &address
+			IPv4Address = OFSocketAddressParseIPv4(IPString, 0);
+			addresses = [OFData dataWithItems: &IPv4Address
 						    count: 1
-						 itemSize: sizeof(address)];
+						 itemSize: sizeof(IPv4Address)];
 			[interface setObject: addresses
 				      forKey: OFNetworkInterfaceIPv4Addresses];
 		}
 	} @finally {
 		free(adapterInfo);

Index: tests/OFSystemInfoTests.m
==================================================================
--- tests/OFSystemInfoTests.m
+++ tests/OFSystemInfoTests.m
@@ -134,10 +134,11 @@
 	networkInterfaces = [OFSystemInfo networkInterfaces];
 	[OFStdOut writeString: @"[OFSystemInfo] Network interfaces: "];
 	for (OFString *name in networkInterfaces) {
 		bool firstAddress = true;
 		OFNetworkInterface interface;
+		OFData *hardwareAddress;
 
 		if (!firstInterface)
 			[OFStdOut writeString: @"; "];
 
 		firstInterface = false;
@@ -158,14 +159,31 @@
 # endif
 # ifdef OF_HAVE_APPLETALK
 		printAddresses([interface objectForKey:
 		    OFNetworkInterfaceAppleTalkAddresses], &firstAddress);
 # endif
+
+		hardwareAddress = [interface
+		    objectForKey: OFNetworkInterfaceHardwareAddress];
+		if (hardwareAddress != nil) {
+			const unsigned char *bytes = hardwareAddress.items;
+			size_t length = hardwareAddress.count;
+
+			if (!firstAddress)
+				[OFStdOut writeString: @", "];
+
+			for (size_t i = 0; i < length; i++) {
+				if (i > 0)
+					[OFStdOut writeString: @":"];
+
+				[OFStdOut writeFormat: @"%02X", bytes[i]];
+			}
+		}
 
 		[OFStdOut writeString: @")"];
 	}
 	[OFStdOut writeString: @"\n"];
 #endif
 
 	objc_autoreleasePoolPop(pool);
 }
 @end