diff --git a/of/ctl/src/main/java/net/onrc/onos/of/ctl/registry/IdBlock.java b/of/ctl/src/main/java/net/onrc/onos/of/ctl/registry/IdBlock.java
new file mode 100644
index 0000000..45d3c83
--- /dev/null
+++ b/of/ctl/src/main/java/net/onrc/onos/of/ctl/registry/IdBlock.java
@@ -0,0 +1,32 @@
+package net.onrc.onos.of.ctl.registry;
+
+public class IdBlock {
+    private final long start;
+    private final long end;
+    private final long size;
+
+    public IdBlock(long start, long end, long size) {
+        this.start = start;
+        this.end = end;
+        this.size = size;
+    }
+
+    public long getStart() {
+        return start;
+    }
+
+    public long getEnd() {
+        return end;
+    }
+
+    public long getSize() {
+        return size;
+    }
+
+    @Override
+    public String toString() {
+        return "IdBlock [start=" + start + ", end=" + end + ", size=" + size
+                + "]";
+    }
+}
+