diff --git a/src/main/java/net/onrc/onos/core/util/PortNumber.java b/src/main/java/net/onrc/onos/core/util/PortNumber.java
new file mode 100644
index 0000000..f9f27bd
--- /dev/null
+++ b/src/main/java/net/onrc/onos/core/util/PortNumber.java
@@ -0,0 +1,145 @@
+package net.onrc.onos.core.util;
+
+import org.codehaus.jackson.annotate.JsonProperty;
+
+/**
+ * Immutable class representing a port number.
+ * <p/>
+ * Current implementation supports only OpenFlow 1.0 (16 bit unsigned) port number.
+ */
+public final class PortNumber {
+    /**
+     * Special port values.
+     * <p/>
+     * Those values are taken as-is from the OpenFlow-v1.0.0 specification
+     * (pp 18-19).
+     */
+    public enum PortValues {
+        /** Maximum number of physical switch ports. */
+        PORT_MAX((short) 0xff00),
+
+    /* Fake output "ports". */
+
+        /** Send the packet out the input port. This
+           virtual port must be explicitly used
+           in order to send back out of the input
+           port. */
+        PORT_IN_PORT((short) 0xfff8),
+
+        /** Perform actions in flow table.
+           NB: This can only be the destination
+           port for packet-out messages. */
+        PORT_TABLE((short) 0xfff9),
+
+        /** Process with normal L2/L3 switching. */
+        PORT_NORMAL((short) 0xfffa),
+
+        /** All physical ports except input port and
+           those disabled by STP. */
+        PORT_FLOOD((short) 0xfffb),
+
+        /** All physical ports except input port. */
+        PORT_ALL((short) 0xfffc),
+
+        /** Send to controller. */
+        PORT_CONTROLLER((short) 0xfffd),
+
+        /** Local openflow "port". */
+        PORT_LOCAL((short) 0xfffe),
+
+        /** Not associated with a physical port. */
+        PORT_NONE((short) 0xffff);
+
+        private final short value;    // The value
+
+        /**
+         * Constructor for a given value.
+         *
+         * @param value the value to use for the initialization.
+         */
+        private PortValues(short value) {
+            this.value = value;
+        }
+
+        /**
+         * Get the value as a short integer.
+         *
+         * @return the value as a short integer.
+         */
+        private short value() {
+            return this.value;
+        }
+    }
+
+    private final short value;
+
+    /**
+     * Default constructor.
+     */
+    protected PortNumber() {
+        this.value = 0;
+    }
+
+    /**
+     * Copy constructor.
+     *
+     * @param other the object to copy from.
+     */
+    public PortNumber(PortNumber other) {
+        this.value = other.value();
+    }
+
+    /**
+     * Constructor from a short integer value.
+     *
+     * @param value the value to use.
+     */
+    public PortNumber(short value) {
+        this.value = value;
+    }
+
+    /**
+     * Constructor from a PortValues enum value.
+     *
+     * @param value the value to use.
+     */
+    public PortNumber(PortValues value) {
+        this.value = value.value();
+    }
+
+    /**
+     * Get the value of the port.
+     *
+     * @return the value of the port.
+     */
+    @JsonProperty("value")
+    public short value() {
+        return value;
+    }
+
+    /**
+     * Convert the port value to a string.
+     *
+     * @return the port value as a string.
+     */
+    @Override
+    public String toString() {
+        return Short.toString(this.value);
+    }
+
+    @Override
+    public boolean equals(Object other) {
+        if (!(other instanceof PortNumber)) {
+            return false;
+        }
+
+        PortNumber otherPort = (PortNumber) other;
+
+        return value == otherPort.value;
+    }
+
+    @Override
+    public int hashCode() {
+        return value;
+    }
+}