diff --git a/java_gen/pre-written/src/main/java/org/projectfloodlight/openflow/types/IPAddress.java b/java_gen/pre-written/src/main/java/org/projectfloodlight/openflow/types/IPAddress.java
index 7c50aed..ed8a11b 100644
--- a/java_gen/pre-written/src/main/java/org/projectfloodlight/openflow/types/IPAddress.java
+++ b/java_gen/pre-written/src/main/java/org/projectfloodlight/openflow/types/IPAddress.java
@@ -4,6 +4,29 @@
 
     public abstract IPVersion getIpVersion();
 
+    /**
+     * Checks if this IPAddress represents a valid CIDR style netmask, i.e.,
+     * it has a set of leading "1" bits followed by only "0" bits
+     * @return true if this represents a valid CIDR style netmask, false
+     * otherwise
+     */
+    public boolean isCidrMask() {
+        return asCidrMaskLength() != -1;
+    }
+
+    /**
+     * If this IPAddress represents a valid CIDR style netmask (see
+     * isCidrMask()) returns the length of the prefix (the number of "1" bits).
+     * @return length of CIDR mask or -1 if this is not a CIDR netmask
+     */
+    public abstract int asCidrMaskLength();
+
+    @Override
+    public abstract boolean equals(Object other);
+
+    @Override
+    public abstract int hashCode();
+
     public static IPAddress<?> of(String ip) {
         if (ip.indexOf('.') != -1)
             return IPv4Address.of(ip);