diff --git a/libcockatrice_utility/CMakeLists.txt b/libcockatrice_utility/CMakeLists.txt
index 0575c260f..9eeb87296 100644
--- a/libcockatrice_utility/CMakeLists.txt
+++ b/libcockatrice_utility/CMakeLists.txt
@@ -12,6 +12,7 @@ set(UTILITY_SOURCES libcockatrice/utility/expression.cpp libcockatrice/utility/l
 set(UTILITY_HEADERS
     libcockatrice/utility/color.h libcockatrice/utility/expression.h libcockatrice/utility/levenshtein.h
     libcockatrice/utility/macros.h libcockatrice/utility/passwordhasher.h libcockatrice/utility/trice_limits.h
+    libcockatrice/utility/zone_names.h
 )
 
 add_library(libcockatrice_utility STATIC ${UTILITY_SOURCES} ${UTILITY_HEADERS})
diff --git a/libcockatrice_utility/libcockatrice/utility/zone_names.h b/libcockatrice_utility/libcockatrice/utility/zone_names.h
new file mode 100644
index 000000000..d1463de6a
--- /dev/null
+++ b/libcockatrice_utility/libcockatrice/utility/zone_names.h
@@ -0,0 +1,19 @@
+#ifndef ZONE_NAMES_H
+#define ZONE_NAMES_H
+
+namespace ZoneNames
+{
+// Protocol-level zone identifiers shared between client and server.
+// These must match exactly across all components.
+
+constexpr const char *TABLE = "table";
+constexpr const char *GRAVE = "grave";
+constexpr const char *EXILE = "rfg"; // "removed from game"
+constexpr const char *HAND = "hand";
+constexpr const char *DECK = "deck";
+constexpr const char *SIDEBOARD = "sb";
+constexpr const char *STACK = "stack";
+
+} // namespace ZoneNames
+
+#endif // ZONE_NAMES_H