diff --git a/src/main/java/net/onrc/onos/core/util/PortNumberUtils.java b/src/main/java/net/onrc/onos/core/util/PortNumberUtils.java
new file mode 100644
index 0000000..38051ff
--- /dev/null
+++ b/src/main/java/net/onrc/onos/core/util/PortNumberUtils.java
@@ -0,0 +1,74 @@
+package net.onrc.onos.core.util;
+
+import static com.google.common.base.Preconditions.checkNotNull;
+
+import org.projectfloodlight.openflow.protocol.OFPortDesc;
+import org.projectfloodlight.openflow.protocol.OFVersion;
+import org.projectfloodlight.openflow.types.OFPort;
+
+/**
+ * {@link PortNumber} related utilities.
+ */
+public final class PortNumberUtils {
+
+    /**
+     * Gets {@link PortNumber} for specified port.
+     *
+     * @param ofVersion OF version to use translating {@code portNumber}
+     * @param portNumber treated as uint16 if {@link OFVersion#OF_10}
+     *                  uint32 otherwise
+     * @return {@link PortNumber}
+     */
+    public static PortNumber openFlow(OFVersion ofVersion, int portNumber) {
+        if (ofVersion == OFVersion.OF_10) {
+            return PortNumber.uint16(toOF10(portNumber));
+        } else {
+            return PortNumber.uint32(portNumber);
+        }
+    }
+
+    /**
+     * Gets {@link PortNumber} for specified port.
+     *
+     * @param desc {@link OFPortDesc}
+     * @return {@link PortNumber}
+     */
+    public static PortNumber openFlow(final OFPortDesc desc) {
+        if (checkNotNull(desc).getVersion() == OFVersion.OF_10) {
+            return PortNumber.uint16(desc.getPortNo().getShortPortNumber());
+        } else {
+            return PortNumber.uint32(desc.getPortNo().getPortNumber());
+        }
+    }
+
+    /**
+     * Validate OF1.0 port number.
+     *
+     * @param of10PortNumber 0F1.0 port number or {@link OFPort#getPortNumber()}
+     * @return OF1.0 port number
+     * @throws IllegalArgumentException if out of valid OF1.0 range
+     */
+    public static short toOF10(final int of10PortNumber) {
+        try {
+            // if the input was from OFPort#getPortNumber()
+            // some named/reserved port number to OF1.0 constants.
+            return OFPort.ofInt(of10PortNumber).getShortPortNumber();
+        } catch (IllegalArgumentException e) {
+            // OFPort#getShortPortNumber will rejects OF1.0 special ports
+            if (0xFFf8 <= of10PortNumber && of10PortNumber <= 0xFFff) {
+                // allow OF1.0 Fake output "ports" to pass
+                return (short) (0xFFFF & of10PortNumber);
+            } else if (0xFF00 == of10PortNumber) {
+                // allow OFPP_MAX
+                return (short) (0xFFFF & of10PortNumber);
+            }
+            throw e;
+        }
+    }
+
+    /**
+     * Avoid instantiation.
+     */
+    private PortNumberUtils() {}
+
+}