diff --git a/redfish-core/src/registries.cpp b/redfish-core/src/registries.cpp
new file mode 100644
index 0000000..3bfe059
--- /dev/null
+++ b/redfish-core/src/registries.cpp
@@ -0,0 +1,54 @@
+#include "registries.hpp"
+
+#include "registries/base_message_registry.hpp"
+#include "registries/openbmc_message_registry.hpp"
+#include "str_utility.hpp"
+
+#include <string>
+#include <vector>
+
+namespace redfish::registries
+{
+
+const Message* getMessageFromRegistry(const std::string& messageKey,
+                                      std::span<const MessageEntry> registry)
+{
+    std::span<const MessageEntry>::iterator messageIt =
+        std::find_if(registry.begin(), registry.end(),
+                     [&messageKey](const MessageEntry& messageEntry) {
+        return std::strcmp(messageEntry.first, messageKey.c_str()) == 0;
+        });
+    if (messageIt != registry.end())
+    {
+        return &messageIt->second;
+    }
+
+    return nullptr;
+}
+
+const Message* getMessage(std::string_view messageID)
+{
+    // Redfish MessageIds are in the form
+    // RegistryName.MajorVersion.MinorVersion.MessageKey, so parse it to find
+    // the right Message
+    std::vector<std::string> fields;
+    fields.reserve(4);
+    bmcweb::split(fields, messageID, '.');
+    const std::string& registryName = fields[0];
+    const std::string& messageKey = fields[3];
+
+    // Find the right registry and check it for the MessageKey
+    if (std::string(base::header.registryPrefix) == registryName)
+    {
+        return getMessageFromRegistry(
+            messageKey, std::span<const MessageEntry>(base::registry));
+    }
+    if (std::string(openbmc::header.registryPrefix) == registryName)
+    {
+        return getMessageFromRegistry(
+            messageKey, std::span<const MessageEntry>(openbmc::registry));
+    }
+    return nullptr;
+}
+
+} // namespace redfish::registries