diff --git a/src/slotmap.c b/src/slotmap.c
index a8874fb..703dd02 100644
--- a/src/slotmap.c
+++ b/src/slotmap.c
@@ -29,6 +29,10 @@ const char *slotmap_name(char *buf, size_t buf_len, const struct slot_mapping *m
 	return buf;
 }
 
+uint32_t slotmap_get_id(const struct slot_mapping *map)
+{
+	return (map->bank.bank_id << 16) | map->bank.slot_nr;
+}
 
 /* thread-safe lookup of map by client:slot */
 struct slot_mapping *slotmap_by_client(struct slotmaps *maps, const struct client_slot *client)
diff --git a/src/slotmap.h b/src/slotmap.h
index 5d3d891..a26de6d 100644
--- a/src/slotmap.h
+++ b/src/slotmap.h
@@ -68,6 +68,8 @@ struct slotmaps {
 	pthread_rwlock_t rwlock;
 };
 
+uint32_t slotmap_get_id(const struct slot_mapping *map);
+
 /* thread-safe lookup of map by client:slot */
 struct slot_mapping *slotmap_by_client(struct slotmaps *maps, const struct client_slot *client);