diff --git a/src/aeser_id.erl b/src/aeser_id.erl
index e71fd21..2003738 100644
--- a/src/aeser_id.erl
+++ b/src/aeser_id.erl
@@ -37,6 +37,7 @@
 -define(PUB_SIZE, 32).
 -define(TAG_SIZE, 1).
 -define(SERIALIZED_SIZE, 33). %% ?TAG_SIZE + ?PUB_SIZE
+-define(SUBNAME_SERIALIZED_SIZE, 65). %% ?TAG_SIZE + ?PUB_SIZE + ?PUB_SIZE
 
 -define(IS_TAG(___TAG___), ___TAG___ =:= account;
                            ___TAG___ =:= oracle;
@@ -83,24 +84,33 @@ is_id(_) -> false.
 -spec encode(id()) -> binary().
 encode(#id{tag = Tag, val = Val}) ->
     Res = <<(encode_tag(Tag)):?TAG_SIZE/unit:8, Val/binary>>,
-    true = ?SERIALIZED_SIZE =:= byte_size(Res),
+    true = serialized_size(Tag) =:= byte_size(Res),
     Res.
 
 -spec decode(binary()) -> id().
 decode(<<Tag:?TAG_SIZE/unit:8, Val:?PUB_SIZE/binary>>) ->
     #id{ tag = decode_tag(Tag)
+       , val = Val};
+decode(<<SubnameTag:?TAG_SIZE/unit:8, Val:(?PUB_SIZE+?PUB_SIZE)/binary>>) ->
+    #id{ tag = subname = decode_tag(SubnameTag)
        , val = Val}.
 
+
 %%%===================================================================
 %%% Internal functions
 %%%===================================================================
 
+serialized_size(subname) -> ?SUBNAME_SERIALIZED_SIZE;
+serialized_size(_)       -> ?SERIALIZED_SIZE.
+
+
 encode_tag(account)    -> 1;
 encode_tag(name)       -> 2;
 encode_tag(commitment) -> 3;
 encode_tag(oracle)     -> 4;
 encode_tag(contract)   -> 5;
 encode_tag(channel)    -> 6;
+encode_tag(subname)    -> 7;
 encode_tag(Other)      -> error({illegal_id_tag_name, Other}).
 
 decode_tag(1) -> account;
@@ -109,4 +119,5 @@ decode_tag(3) -> commitment;
 decode_tag(4) -> oracle;
 decode_tag(5) -> contract;
 decode_tag(6) -> channel;
+decode_tag(7) -> subname;
 decode_tag(X) -> error({illegal_id_tag, X}).