diff --git a/tests/draft-next/optional/format/ipv4.json b/tests/draft-next/optional/format/ipv4.json
index e3e94401..2a4bc2b2 100644
--- a/tests/draft-next/optional/format/ipv4.json
+++ b/tests/draft-next/optional/format/ipv4.json
@@ -81,6 +81,11 @@
                 "description": "invalid non-ASCII '২' (a Bengali 2)",
                 "data": "1২7.0.0.1",
                 "valid": false
+            },
+            {
+                "description": "netmask is not a part of ipv4 address",
+                "data": "192.168.1.0/24",
+                "valid": false
             }
         ]
     }
diff --git a/tests/draft2019-09/optional/format/ipv4.json b/tests/draft2019-09/optional/format/ipv4.json
index ac1e14c6..efe42471 100644
--- a/tests/draft2019-09/optional/format/ipv4.json
+++ b/tests/draft2019-09/optional/format/ipv4.json
@@ -81,6 +81,11 @@
                 "description": "invalid non-ASCII '২' (a Bengali 2)",
                 "data": "1২7.0.0.1",
                 "valid": false
+            },
+            {
+                "description": "netmask is not a part of ipv4 address",
+                "data": "192.168.1.0/24",
+                "valid": false
             }
         ]
     }
diff --git a/tests/draft2020-12/optional/format/ipv4.json b/tests/draft2020-12/optional/format/ipv4.json
index c72b6fc2..86d27bdb 100644
--- a/tests/draft2020-12/optional/format/ipv4.json
+++ b/tests/draft2020-12/optional/format/ipv4.json
@@ -81,6 +81,11 @@
                 "description": "invalid non-ASCII '২' (a Bengali 2)",
                 "data": "1২7.0.0.1",
                 "valid": false
+            },
+            {
+                "description": "netmask is not a part of ipv4 address",
+                "data": "192.168.1.0/24",
+                "valid": false
             }
         ]
     }
diff --git a/tests/draft4/optional/format/ipv4.json b/tests/draft4/optional/format/ipv4.json
index 4706581f..9680fe62 100644
--- a/tests/draft4/optional/format/ipv4.json
+++ b/tests/draft4/optional/format/ipv4.json
@@ -78,6 +78,11 @@
                 "description": "invalid non-ASCII '২' (a Bengali 2)",
                 "data": "1২7.0.0.1",
                 "valid": false
+            },
+            {
+                "description": "netmask is not a part of ipv4 address",
+                "data": "192.168.1.0/24",
+                "valid": false
             }
         ]
     }
diff --git a/tests/draft6/optional/format/ipv4.json b/tests/draft6/optional/format/ipv4.json
index 4706581f..9680fe62 100644
--- a/tests/draft6/optional/format/ipv4.json
+++ b/tests/draft6/optional/format/ipv4.json
@@ -78,6 +78,11 @@
                 "description": "invalid non-ASCII '২' (a Bengali 2)",
                 "data": "1২7.0.0.1",
                 "valid": false
+            },
+            {
+                "description": "netmask is not a part of ipv4 address",
+                "data": "192.168.1.0/24",
+                "valid": false
             }
         ]
     }
diff --git a/tests/draft7/optional/format/ipv4.json b/tests/draft7/optional/format/ipv4.json
index 4706581f..9680fe62 100644
--- a/tests/draft7/optional/format/ipv4.json
+++ b/tests/draft7/optional/format/ipv4.json
@@ -78,6 +78,11 @@
                 "description": "invalid non-ASCII '২' (a Bengali 2)",
                 "data": "1২7.0.0.1",
                 "valid": false
+            },
+            {
+                "description": "netmask is not a part of ipv4 address",
+                "data": "192.168.1.0/24",
+                "valid": false
             }
         ]
     }