diff --git a/src/Proto/Layers/DataPacketFramingLayer.py b/src/Proto/Layers/DataPacketFramingLayer.py
index 72bab5d..b1bb2ee 100644
--- a/src/Proto/Layers/DataPacketFramingLayer.py
+++ b/src/Proto/Layers/DataPacketFramingLayer.py
@@ -11,17 +11,17 @@ class DataPacketFramingLayer:
         STREAM_TERMINATED = 1 << 6
         PREVIEW_DATA = 1 << 7
 
-    PACK_FORMAT = '! H 4s 64s B 2s B B 2s'
+    PACK_FORMAT = '! H 4s 64s B H B B H'
     HEADER_SIZE = struct.calcsize(PACK_FORMAT)
 
-    def __init__(self, length: int, source_name: str, priority: int, synchronization_address: bytes,
-                 sequence_number: int, options: Options, universe: bytes):
+    def __init__(self, length: int, source_name: str, priority: int, synchronization_address: int,
+                 sequence_number: int, options: Options, universe: int):
         assert 0 <= length <= 0x0FFF
         assert len(source_name) <= 64
         assert 0 <= priority <= 200
-        assert len(synchronization_address) == 2
+        assert 0 <= synchronization_address <= 63999
         assert 0 <= sequence_number <= 0xFF
-        assert len(universe) == 2
+        assert 1 <= universe <= 63999
 
         self.length = length
         self.source_name = source_name
diff --git a/src/Proto/Layers/SynchronizationPacketFramingLayer.py b/src/Proto/Layers/SynchronizationPacketFramingLayer.py
index da126e7..b74f93b 100644
--- a/src/Proto/Layers/SynchronizationPacketFramingLayer.py
+++ b/src/Proto/Layers/SynchronizationPacketFramingLayer.py
@@ -4,13 +4,13 @@ from Proto.Vector import VECTOR
 
 
 class SynchronizationPacketFramingLayer:
-    PACK_FORMAT = '! H 4s B 2s 2x'
+    PACK_FORMAT = '! H 4s B H 2x'
     HEADER_SIZE = struct.calcsize(PACK_FORMAT)
 
-    def __init__(self, length: int, sequence_number: int, synchronization_address: bytes):
+    def __init__(self, length: int, sequence_number: int, synchronization_address: int):
         assert 0 <= length <= 0xFFF
         assert 0 <= sequence_number <= 0xFF
-        assert len(synchronization_address) == 2
+        assert 1 <= synchronization_address <= 63999
 
         self.length = length
         self.sequence_number = sequence_number
diff --git a/src/Proto/Layers/UniverseDiscoveryLayer.py b/src/Proto/Layers/UniverseDiscoveryLayer.py
index 6bacd48..5e59cc4 100644
--- a/src/Proto/Layers/UniverseDiscoveryLayer.py
+++ b/src/Proto/Layers/UniverseDiscoveryLayer.py
@@ -8,13 +8,13 @@ class UniverseDiscoveryLayer:
     PACK_FORMAT = '! H 4s B B'
     HEADER_SIZE = struct.calcsize(PACK_FORMAT)
 
-    def __init__(self, length: int, page: int, last_page: int, universe_list: List[bytes]):
+    def __init__(self, length: int, page: int, last_page: int, universe_list: List[int]):
         assert 0 <= length <= 0xFFF
         assert 0 <= page <= 0xFF
         assert 0 <= last_page <= 0xFF
         assert len(universe_list) <= 512
         for universe in universe_list:
-            assert len(universe) == 2
+            assert 1 <= universe <= 63999
 
         self.length = length
         self.page = page
@@ -31,7 +31,7 @@ class UniverseDiscoveryLayer:
             self.last_page
         )
 
-        buffer += b''.join(self.universe_list)
+        buffer += struct.pack(f'! {len(self.universe_list)}H', *self.universe_list)
 
         return buffer
 
@@ -53,6 +53,6 @@ class UniverseDiscoveryLayer:
         assert len(buffer) >= offset + length
 
         for i in range(universe_list_offset, offset + length, 2):
-            universe_list.append(buffer[i:i+2])
+            universe_list.extend(struct.unpack_from('!H', buffer, i))
 
         return cls(length, page, last_page, universe_list)
diff --git a/src/Proto/Packets/DataPacket.py b/src/Proto/Packets/DataPacket.py
index e63eb28..e1efe1c 100644
--- a/src/Proto/Packets/DataPacket.py
+++ b/src/Proto/Packets/DataPacket.py
@@ -3,15 +3,15 @@ from Proto.Vector import VECTOR
 
 
 class DataPacket:
-    def __init__(self, cid: bytes, source_name: str, priority: int, synchronization_address: bytes,
-                 sequence_number: int, options: DataPacketFramingLayer.Options, universe: bytes,
+    def __init__(self, cid: bytes, source_name: str, priority: int, synchronization_address: int,
+                 sequence_number: int, options: DataPacketFramingLayer.Options, universe: int,
                  property_values: bytes):
         assert len(cid) == 16
         assert len(source_name) <= 64
         assert 0 <= priority <= 100
-        assert len(synchronization_address) == 2
+        assert 0 <= synchronization_address <= 63999
         assert 0 <= sequence_number <= 0xFF
-        assert len(universe) == 2
+        assert 1 <= universe <= 63999
         assert 1 <= len(property_values) <= 513
 
         self.cid = cid
diff --git a/src/Proto/Packets/SynchronizationPacket.py b/src/Proto/Packets/SynchronizationPacket.py
index b6303f9..694e09f 100644
--- a/src/Proto/Packets/SynchronizationPacket.py
+++ b/src/Proto/Packets/SynchronizationPacket.py
@@ -3,10 +3,10 @@ from Proto.Vector import VECTOR
 
 
 class SynchronizationPacket:
-    def __init__(self, cid: bytes, sequence_number: int, synchronization_address: bytes):
+    def __init__(self, cid: bytes, sequence_number: int, synchronization_address: int):
         assert len(cid) == 16
         assert 0 <= sequence_number <= 0xFF
-        assert len(synchronization_address) == 2
+        assert 1 <= synchronization_address <= 63999
 
         self.cid = cid
         self.sequence_number = sequence_number
diff --git a/src/Proto/Packets/UniverseDiscoveryPacket.py b/src/Proto/Packets/UniverseDiscoveryPacket.py
index 790688c..ca816bd 100644
--- a/src/Proto/Packets/UniverseDiscoveryPacket.py
+++ b/src/Proto/Packets/UniverseDiscoveryPacket.py
@@ -5,14 +5,14 @@ from Proto.Vector import VECTOR
 
 
 class UniverseDiscoveryPacket:
-    def __init__(self, cid: bytes, source_name: str, page: int, last_page: int, universe_list: List[bytes]):
+    def __init__(self, cid: bytes, source_name: str, page: int, last_page: int, universe_list: List[int]):
         assert len(cid) == 16
         assert len(source_name) <= 64
         assert 0 <= page <= 0xFF
         assert 0 <= last_page <= 0xFF
         assert len(universe_list) <= 512
         for universe in universe_list:
-            assert len(universe) == 2
+            assert 1 <= universe <= 63999
 
         self.cid = cid
         self.source_name = source_name