diff --git a/message.hpp b/message.hpp
index 331c5bf..a53727a 100644
--- a/message.hpp
+++ b/message.hpp
@@ -63,6 +63,9 @@
 namespace LAN
 {
 
+constexpr uint8_t requesterBMCAddress = 0x20;
+constexpr uint8_t responderBMCAddress = 0x81;
+
 namespace header
 {