diff --git a/libp2p/kad_dht/common.py b/libp2p/kad_dht/common.py
new file mode 100644
index 00000000..392bffd0
--- /dev/null
+++ b/libp2p/kad_dht/common.py
@@ -0,0 +1,14 @@
+"""
+Shared constants and protocol parameters for the Kademlia DHT.
+"""
+
+from libp2p.custom_types import (
+    TProtocol,
+)
+
+# Constants for the Kademlia algorithm
+ALPHA = 3  # Concurrency parameter
+PROTOCOL_ID = TProtocol("/ipfs/kad/1.0.0")
+QUERY_TIMEOUT = 10
+
+TTL = DEFAULT_TTL = 24 * 60 * 60  # 24 hours in seconds
diff --git a/libp2p/kad_dht/kad_dht.py b/libp2p/kad_dht/kad_dht.py
index 7daad4cb..dcf323ba 100644
--- a/libp2p/kad_dht/kad_dht.py
+++ b/libp2p/kad_dht/kad_dht.py
@@ -5,7 +5,9 @@ This module provides a complete Distributed Hash Table (DHT)
 implementation based on the Kademlia algorithm and protocol.
 """
 
-from enum import Enum
+from enum import (
+    Enum,
+)
 import logging
 import time
 
@@ -18,9 +20,6 @@ import varint
 from libp2p.abc import (
     IHost,
 )
-from libp2p.custom_types import (
-    TProtocol,
-)
 from libp2p.network.stream.net_stream import (
     INetStream,
 )
@@ -34,6 +33,11 @@ from libp2p.tools.async_service import (
     Service,
 )
 
+from .common import (
+    ALPHA,
+    PROTOCOL_ID,
+    QUERY_TIMEOUT,
+)
 from .pb.kademlia_pb2 import (
     Message,
 )
@@ -53,11 +57,7 @@ from .value_store import (
 logger = logging.getLogger("kademlia-example.kad_dht")
 # logger = logging.getLogger("libp2p.kademlia")
 # Default parameters
-PROTOCOL_ID = TProtocol("/ipfs/kad/1.0.0")
-ROUTING_TABLE_REFRESH_INTERVAL = 1 * 60  # 1 min in seconds for testing
-TTL = 24 * 60 * 60  # 24 hours in seconds
-ALPHA = 3
-QUERY_TIMEOUT = 10  # seconds
+ROUTING_TABLE_REFRESH_INTERVAL = 60  # 1 min in seconds for testing
 
 
 class DHTMode(Enum):
diff --git a/libp2p/kad_dht/peer_routing.py b/libp2p/kad_dht/peer_routing.py
index f3689e11..4bcdb647 100644
--- a/libp2p/kad_dht/peer_routing.py
+++ b/libp2p/kad_dht/peer_routing.py
@@ -15,9 +15,6 @@ from libp2p.abc import (
     INetStream,
     IPeerRouting,
 )
-from libp2p.custom_types import (
-    TProtocol,
-)
 from libp2p.peer.id import (
     ID,
 )
@@ -25,6 +22,10 @@ from libp2p.peer.peerinfo import (
     PeerInfo,
 )
 
+from .common import (
+    ALPHA,
+    PROTOCOL_ID,
+)
 from .pb.kademlia_pb2 import (
     Message,
 )
@@ -38,10 +39,7 @@ from .utils import (
 # logger = logging.getLogger("libp2p.kademlia.peer_routing")
 logger = logging.getLogger("kademlia-example.peer_routing")
 
-# Constants for the Kademlia algorithm
-ALPHA = 3  # Concurrency parameter
 MAX_PEER_LOOKUP_ROUNDS = 20  # Maximum number of rounds in peer lookup
-PROTOCOL_ID = TProtocol("/ipfs/kad/1.0.0")
 
 
 class PeerRouting(IPeerRouting):
@@ -62,7 +60,6 @@ class PeerRouting(IPeerRouting):
         """
         self.host = host
         self.routing_table = routing_table
-        self.protocol_id = PROTOCOL_ID
 
     async def find_peer(self, peer_id: ID) -> PeerInfo | None:
         """
@@ -247,7 +244,7 @@ class PeerRouting(IPeerRouting):
             # Open a stream to the peer using the Kademlia protocol
             logger.debug(f"Opening stream to {peer} for closest peers query")
             try:
-                stream = await self.host.new_stream(peer, [self.protocol_id])
+                stream = await self.host.new_stream(peer, [PROTOCOL_ID])
                 logger.debug(f"Stream opened to {peer}")
             except Exception as e:
                 logger.warning(f"Failed to open stream to {peer}: {e}")
diff --git a/libp2p/kad_dht/provider_store.py b/libp2p/kad_dht/provider_store.py
index 00ac6010..5c34f0c7 100644
--- a/libp2p/kad_dht/provider_store.py
+++ b/libp2p/kad_dht/provider_store.py
@@ -29,6 +29,11 @@ from libp2p.peer.peerinfo import (
     PeerInfo,
 )
 
+from .common import (
+    ALPHA,
+    PROTOCOL_ID,
+    QUERY_TIMEOUT,
+)
 from .pb.kademlia_pb2 import (
     Message,
 )
@@ -40,9 +45,6 @@ logger = logging.getLogger("kademlia-example.provider_store")
 PROVIDER_RECORD_REPUBLISH_INTERVAL = 22 * 60 * 60  # 22 hours in seconds
 PROVIDER_RECORD_EXPIRATION_INTERVAL = 48 * 60 * 60  # 48 hours in seconds
 PROVIDER_ADDRESS_TTL = 30 * 60  # 30 minutes in seconds
-PROTOCOL_ID = TProtocol("/ipfs/kad/1.0.0")
-ALPHA = 3  # Number of parallel queries/advertisements
-QUERY_TIMEOUT = 10  # Timeout for each query in seconds
 
 
 class ProviderRecord:
diff --git a/libp2p/kad_dht/routing_table.py b/libp2p/kad_dht/routing_table.py
index 4377c591..15b6721e 100644
--- a/libp2p/kad_dht/routing_table.py
+++ b/libp2p/kad_dht/routing_table.py
@@ -13,10 +13,9 @@ import trio
 from libp2p.abc import (
     IHost,
 )
-from libp2p.custom_types import (
-    TProtocol,
+from libp2p.kad_dht.utils import (
+    xor_distance,
 )
-from libp2p.kad_dht.utils import xor_distance
 from libp2p.peer.id import (
     ID,
 )
@@ -24,6 +23,9 @@ from libp2p.peer.peerinfo import (
     PeerInfo,
 )
 
+from .common import (
+    PROTOCOL_ID,
+)
 from .pb.kademlia_pb2 import (
     Message,
 )
@@ -242,12 +244,9 @@ class KBucket:
         if not peer_info:
             raise ValueError(f"Peer {peer_id} not in bucket")
 
-        # Default protocol ID for Kademlia DHT
-        protocol_id = TProtocol("/ipfs/kad/1.0.0")
-
         try:
             # Open a stream to the peer with the DHT protocol
-            stream = await self.host.new_stream(peer_id, [protocol_id])
+            stream = await self.host.new_stream(peer_id, [PROTOCOL_ID])
 
             try:
                 # Create ping protobuf message
diff --git a/libp2p/kad_dht/value_store.py b/libp2p/kad_dht/value_store.py
index a2e54776..b79425fd 100644
--- a/libp2p/kad_dht/value_store.py
+++ b/libp2p/kad_dht/value_store.py
@@ -19,6 +19,10 @@ from libp2p.peer.id import (
     ID,
 )
 
+from .common import (
+    DEFAULT_TTL,
+    PROTOCOL_ID,
+)
 from .pb.kademlia_pb2 import (
     Message,
 )
@@ -26,10 +30,6 @@ from .pb.kademlia_pb2 import (
 # logger = logging.getLogger("libp2p.kademlia.value_store")
 logger = logging.getLogger("kademlia-example.value_store")
 
-# Default time to live for values in seconds (24 hours)
-DEFAULT_TTL = 24 * 60 * 60
-PROTOCOL_ID = TProtocol("/ipfs/kad/1.0.0")
-
 
 class ValueStore:
     """
diff --git a/tests/core/kad_dht/test_unit_peer_routing.py b/tests/core/kad_dht/test_unit_peer_routing.py
index 72320b73..ffe20655 100644
--- a/tests/core/kad_dht/test_unit_peer_routing.py
+++ b/tests/core/kad_dht/test_unit_peer_routing.py
@@ -89,7 +89,6 @@ class TestPeerRouting:
 
         assert peer_routing.host == mock_host
         assert peer_routing.routing_table == mock_routing_table
-        assert peer_routing.protocol_id == PROTOCOL_ID
 
     @pytest.mark.trio
     async def test_find_peer_local_host(self, peer_routing, mock_host):