diff --git a/subnet/types.proto b/subnet/types.proto
new file mode 100644
index 0000000..aa69bba
--- /dev/null
+++ b/subnet/types.proto
@@ -0,0 +1,18 @@
+syntax = "proto3";
+
+package neo.fs.v2.subnet;
+
+option go_package = "github.com/nspcc-dev/neofs-api-go/v2/subnet/grpc;subnet";
+option csharp_namespace = "Neo.FileStorage.API.Subnet";
+
+import "refs/types.proto";
+
+// NeoFS subnetwork description
+message SubnetInfo {
+    // Unique subnet identifier. Missing ID is
+    // equivalent to zero (default subnetwork) ID.
+    neo.fs.v2.refs.SubnetID id = 1;
+
+    // Identifier of the subnetwork owner
+    neo.fs.v2.refs.OwnerID owner = 2;
+}