diff --git a/src/model/PhysAddr.ts b/src/model/PhysAddr.ts
new file mode 100644
index 000000000..e417d6460
--- /dev/null
+++ b/src/model/PhysAddr.ts
@@ -0,0 +1,27 @@
+/**
+ * Represents a physical (MAC) address.
+ * @module PhysAddr
+ */ /** */
+export class PhysAddr {
+  /** the MAC address string */
+  public addr: string;
+
+  constructor(addr: string) {
+    this.addr = addr.toUpperCase().replace(/[^0-9A-F]/g, '');
+  }
+
+  /** displayable string */
+  public toString() {
+    const asArray = this.addr.split('');
+    if (asArray.length === 12) {
+      return asArray[0] + asArray[1] + ':' +
+        asArray[2] + asArray[3] + ':' +
+        asArray[4] + asArray[5] + ':' +
+        asArray[6] + asArray[7] + ':' +
+        asArray[8] + asArray[9] + ':' +
+        asArray[10] + asArray[11];
+    } else {
+      return this.addr;
+    }
+  }
+}