diff --git a/of-save/lib/src/main/java/org/projectfloodlight/openflow/types/U128.java b/of-save/lib/src/main/java/org/projectfloodlight/openflow/types/U128.java
new file mode 100644
index 0000000..ddf4faa
--- /dev/null
+++ b/of-save/lib/src/main/java/org/projectfloodlight/openflow/types/U128.java
@@ -0,0 +1,222 @@
+package org.projectfloodlight.openflow.types;
+
+import javax.annotation.Nonnull;
+
+import org.jboss.netty.buffer.ChannelBuffer;
+
+import com.google.common.hash.PrimitiveSink;
+import com.google.common.primitives.UnsignedLongs;
+
+public class U128 implements OFValueType<U128>, HashValue<U128> {
+
+    static final int LENGTH = 16;
+
+    private final long raw1; // MSBs
+    private final long raw2; // LSBs
+
+    public static final U128 ZERO = new U128(0, 0);
+
+    private U128(long raw1, long raw2) {
+        this.raw1 = raw1;
+        this.raw2 = raw2;
+    }
+
+    public static U128 of(long raw1, long raw2) {
+        if (raw1 == 0 && raw2 == 0)
+            return ZERO;
+        return new U128(raw1, raw2);
+    }
+
+    @Override
+    public int getLength() {
+        return LENGTH;
+    }
+
+
+    public long getMsb() {
+        return raw1;
+    }
+
+    public long getLsb() {
+        return raw2;
+    }
+
+    @Override
+    public U128 applyMask(U128 mask) {
+        return and(mask);
+    }
+
+    @Override
+    public int hashCode() {
+        final int prime = 31;
+        int result = 1;
+        result = prime * result + (int) (raw1 ^ (raw1 >>> 32));
+        result = prime * result + (int) (raw2 ^ (raw2 >>> 32));
+        return result;
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj)
+            return true;
+        if (obj == null)
+            return false;
+        if (getClass() != obj.getClass())
+            return false;
+        U128 other = (U128) obj;
+        if (raw1 != other.raw1)
+            return false;
+        if (raw2 != other.raw2)
+            return false;
+        return true;
+    }
+
+    public void write16Bytes(ChannelBuffer cb) {
+        cb.writeLong(raw1);
+        cb.writeLong(raw2);
+    }
+
+    public static U128 read16Bytes(ChannelBuffer cb) {
+        long raw1 = cb.readLong();
+        long raw2 = cb.readLong();
+        return of(raw1, raw2);
+    }
+
+    @Override
+    public String toString() {
+        return String.format("0x%016x%016x", raw1, raw2);
+    }
+
+    @Override
+    public int compareTo(@Nonnull U128 o) {
+        int msb = UnsignedLongs.compare(this.raw1, o.raw1);
+        if(msb != 0)
+            return msb;
+        else
+            return UnsignedLongs.compare(this.raw2, o.raw2);
+    }
+
+    @Override
+    public void putTo(PrimitiveSink sink) {
+        sink.putLong(raw1);
+        sink.putLong(raw2);
+    }
+
+    @Override
+    public U128 inverse() {
+        return U128.of(~raw1, ~raw2);
+    }
+
+    @Override
+    public U128 or(U128 other) {
+        return U128.of(raw1 | other.raw1, raw2 | other.raw2);
+    }
+
+    @Override
+    public U128 and(U128 other) {
+        return U128.of(raw1 & other.raw1, raw2 & other.raw2);
+    }
+
+    @Override
+    public U128 xor(U128 other) {
+        return U128.of(raw1 ^ other.raw1, raw2 ^ other.raw2);
+    }
+
+    @Override
+    public U128 add(U128 other) {
+        long newRaw2 = this.raw2 + other.raw2;
+        long newRaw1 = this.raw1 + other.raw1;
+        if(UnsignedLongs.compare(newRaw2, this.raw2) < 0) {
+            // raw2 overflow
+            newRaw1+=1;
+        }
+        return U128.of(newRaw1, newRaw2);
+    }
+
+    @Override
+    public U128 subtract(U128 other) {
+        long newRaw2 = this.raw2 - other.raw2;
+        long newRaw1 = this.raw1 - other.raw1;
+        if(UnsignedLongs.compare(this.raw2, other.raw2) < 0) {
+            newRaw1 -= 1;
+        }
+        return U128.of(newRaw1, newRaw2);
+    }
+    @Override
+    public int prefixBits(int numBits) {
+        return HashValueUtils.prefixBits(this.raw1, numBits);
+    }
+
+    @Override
+    public HashValue.Builder<U128> builder() {
+        return new U128Builder(raw1, raw2);
+    }
+
+    static class U128Builder implements HashValue.Builder<U128> {
+        private long raw1, raw2;
+
+        public U128Builder(long raw1, long raw2) {
+            this.raw1 = raw1;
+            this.raw2 = raw2;
+        }
+
+        @Override
+        public Builder<U128> add(U128 other) {
+            raw2 += other.raw2;
+            raw1 += other.raw1;
+            if(UnsignedLongs.compare(raw2, other.raw2) < 0) {
+                // raw2 overflow
+                raw1+=1;
+            }
+            return this;
+        }
+
+        @Override
+        public Builder<U128> subtract(
+                U128 other) {
+            if(UnsignedLongs.compare(this.raw2, other.raw2) >= 0) {
+                raw2 -= other.raw2;
+                raw1 -= other.raw1;
+            } else {
+                // raw2 overflow
+                raw2 -= other.raw2;
+                raw1 = this.raw1 - other.raw1 - 1;
+            }
+            return this;
+        }
+
+        @Override
+        public Builder<U128> invert() {
+            raw1 = ~raw1;
+            raw2 = ~raw2;
+            return this;
+        }
+
+        @Override
+        public Builder<U128> or(U128 other) {
+            raw1 |= other.raw1;
+            raw2 |= other.raw2;
+            return this;
+        }
+
+        @Override
+        public Builder<U128> and(U128 other) {
+            raw1 &= other.raw1;
+            raw2 &= other.raw2;
+            return this;
+        }
+
+        @Override
+        public Builder<U128> xor(U128 other) {
+            raw1 ^= other.raw1;
+            raw2 ^= other.raw2;
+            return this;
+        }
+
+        @Override
+        public U128 build() {
+            return U128.of(raw1, raw2);
+        }
+    }
+
+}