diff --git a/types.hpp b/types.hpp
index b6d27e3..5b39c38 100644
--- a/types.hpp
+++ b/types.hpp
@@ -22,6 +22,7 @@
                                           int64_t, uint64_t, std::string>;
 
 using PropertyMap = std::map<DbusProperty, Value>;
+
 using ObjectTree = std::map<DbusObjectPath,
                             std::map<DbusService, std::vector<DbusInterface>>>;
 
@@ -106,5 +107,9 @@
 constexpr auto DEFAULT_MAC_ADDRESS = "00:00:00:00:00:00";
 constexpr auto DEFAULT_ADDRESS = "0.0.0.0";
 
+constexpr auto MAC_ADDRESS_SIZE_BYTE = 6;
+constexpr auto BITS_32 = 32;
+constexpr auto MASK_32_BIT = 0xFFFFFFFF;
+
 }//namespace network
 }//namespace ipmi