diff --git a/tests/utility/utils.py b/tests/utility/utils.py
index f3f9c50..c5e877f 100644
--- a/tests/utility/utils.py
+++ b/tests/utility/utils.py
@@ -11,6 +11,7 @@ class PortMin:
 
 
 MAX_NODES = 100
+MAX_BLOCKCHAIN_NODES = 50
 
 
 def p2p_port(n):
@@ -23,25 +24,25 @@ def rpc_port(n):
 
 
 def blockchain_p2p_port(n):
-    assert MAX_NODES % 2 == 0 and n <= MAX_NODES / 2
-    return PortMin.n + 3 * MAX_NODES / 2 + n
+    assert n <= MAX_BLOCKCHAIN_NODES
+    return PortMin.n + MAX_NODES + MAX_BLOCKCHAIN_NODES + n
 
 
 def blockchain_rpc_port(n):
-    return PortMin.n + 4 * MAX_NODES / 2 + n
+    return PortMin.n + MAX_NODES + 2 * MAX_BLOCKCHAIN_NODES + n
 
 
 def blockchain_rpc_port_core(n):
-    return PortMin.n + 5 * MAX_NODES / 2 + n
+    return PortMin.n + MAX_NODES + 3 * MAX_BLOCKCHAIN_NODES + n
 
 def blockchain_ws_port(n):
-    return PortMin.n + 6 * MAX_NODES / 2 + n
+    return PortMin.n + MAX_NODES + 4 * MAX_BLOCKCHAIN_NODES + n
 
 def blockchain_rpc_port_tendermint(n):
-    return PortMin.n + 7 * MAX_NODES / 2 + n
+    return PortMin.n + MAX_NODES + 5 * MAX_BLOCKCHAIN_NODES + n
 
 def pprof_port(n):
-    return PortMin.n + 8 * MAX_NODES / 2 + n
+    return PortMin.n + MAX_NODES + 6 * MAX_BLOCKCHAIN_NODES + n
 
 def wait_until(predicate, *, attempts=float("inf"), timeout=float("inf"), lock=None):
     if attempts == float("inf") and timeout == float("inf"):