diff --git a/tests/cidr4_merge/test_cidr4_merger.py b/tests/cidr4_merge/test_cidr4_merger.py
index 6a50aab..c4d0251 100644
--- a/tests/cidr4_merge/test_cidr4_merger.py
+++ b/tests/cidr4_merge/test_cidr4_merger.py
@@ -1,7 +1,5 @@
 from vpn_manager.cidr4_merge.cidr4_merger import (
-    cidr4_to_node,
     find_neighbors,
-    make_cidr4,
     merge_nodes,
     solution,
 )
@@ -11,31 +9,6 @@ def test_true():
     assert True
 
 
-def test_cidr4_to_node():
-    assert cidr4_to_node("4.78.139.0/24") == (72256256, 24)
-    assert cidr4_to_node("0.0.0.0/32") == (0, 32)
-
-    assert cidr4_to_node("23.234.30.0/24") == (401219072, 24)
-    assert cidr4_to_node("172.217.0.0/19") == (2899902464, 19)
-    assert cidr4_to_node("23.225.141.0/24") == (400657664, 24)
-    assert cidr4_to_node("31.13.94.0/23") == (520969728, 23)
-
-    assert cidr4_to_node("0.0.0.0/2") == (0, 2)
-    assert cidr4_to_node("64.0.0.0/2") == (1073741824, 2)
-    assert cidr4_to_node("128.0.0.0/2") == (2147483648, 2)
-    assert cidr4_to_node("192.0.0.0/2") == (3221225472, 2)
-
-
-def test_make_cidr4():
-    assert make_cidr4(72256256, 24) == "4.78.139.0/24"
-    assert make_cidr4(0, 32) == "0.0.0.0/32"
-
-    assert make_cidr4(401219072, 24) == "23.234.30.0/24"
-    assert make_cidr4(2899902464, 19) == "172.217.0.0/19"
-    assert make_cidr4(400657664, 24) == "23.225.141.0/24"
-    assert make_cidr4(520969728, 23) == "31.13.94.0/23"
-
-
 def test_merge_nodes():
     assert merge_nodes((0, 32), (1, 32)) == ((0, 31), 0)
     assert merge_nodes((0, 32), (2, 32)) == ((0, 30), 2)
diff --git a/tests/cidr4_merge/test_util.py b/tests/cidr4_merge/test_util.py
new file mode 100644
index 0000000..ea5eeb2
--- /dev/null
+++ b/tests/cidr4_merge/test_util.py
@@ -0,0 +1,30 @@
+from vpn_manager.cidr4_merge.util import cidr4_to_node, make_cidr4
+
+
+def test_true():
+    assert True
+
+
+def test_cidr4_to_node():
+    assert cidr4_to_node("4.78.139.0/24") == (72256256, 24)
+    assert cidr4_to_node("0.0.0.0/32") == (0, 32)
+
+    assert cidr4_to_node("23.234.30.0/24") == (401219072, 24)
+    assert cidr4_to_node("172.217.0.0/19") == (2899902464, 19)
+    assert cidr4_to_node("23.225.141.0/24") == (400657664, 24)
+    assert cidr4_to_node("31.13.94.0/23") == (520969728, 23)
+
+    assert cidr4_to_node("0.0.0.0/2") == (0, 2)
+    assert cidr4_to_node("64.0.0.0/2") == (1073741824, 2)
+    assert cidr4_to_node("128.0.0.0/2") == (2147483648, 2)
+    assert cidr4_to_node("192.0.0.0/2") == (3221225472, 2)
+
+
+def test_make_cidr4():
+    assert make_cidr4(72256256, 24) == "4.78.139.0/24"
+    assert make_cidr4(0, 32) == "0.0.0.0/32"
+
+    assert make_cidr4(401219072, 24) == "23.234.30.0/24"
+    assert make_cidr4(2899902464, 19) == "172.217.0.0/19"
+    assert make_cidr4(400657664, 24) == "23.225.141.0/24"
+    assert make_cidr4(520969728, 23) == "31.13.94.0/23"