diff --git a/tests/draft2019-09/optional/format/hostname.json b/tests/draft2019-09/optional/format/hostname.json
index 24bfdfc5..ec91c5af 100644
--- a/tests/draft2019-09/optional/format/hostname.json
+++ b/tests/draft2019-09/optional/format/hostname.json
@@ -130,6 +130,21 @@
                 "description": "single dot",
                 "data": ".",
                 "valid": false
+            },
+            {
+                "description": "leading dot",
+                "data": ".example",
+                "valid": false
+            },
+            {
+                "description": "trailing dot",
+                "data": "example.",
+                "valid": false
+            },
+            {
+                "description": "IDN label separator",
+                "data": "example\uff0ecom",
+                "valid": false
             }
         ]
     }
diff --git a/tests/draft2019-09/optional/format/idn-hostname.json b/tests/draft2019-09/optional/format/idn-hostname.json
index 348c504c..45ccf333 100644
--- a/tests/draft2019-09/optional/format/idn-hostname.json
+++ b/tests/draft2019-09/optional/format/idn-hostname.json
@@ -383,6 +383,66 @@
                 "description": "halfwidth ideographic full stop as label separator",
                 "data": "a\uff61b",
                 "valid": true
+            },
+            {
+                "description": "leading dot",
+                "data": ".example",
+                "valid": false
+            },
+            {
+                "description": "leading ideographic full stop",
+                "data": "\u3002example",
+                "valid": false
+            },
+            {
+                "description": "leading fullwidth full stop",
+                "data": "\uff0eexample",
+                "valid": false
+            },
+            {
+                "description": "leading halfwidth ideographic full stop",
+                "data": "\uff61example",
+                "valid": false
+            },
+            {
+                "description": "trailing dot",
+                "data": "example.",
+                "valid": false
+            },
+            {
+                "description": "trailing ideographic full stop",
+                "data": "example\u3002",
+                "valid": false
+            },
+            {
+                "description": "trailing fullwidth full stop",
+                "data": "example\uff0e",
+                "valid": false
+            },
+            {
+                "description": "trailing halfwidth ideographic full stop",
+                "data": "example\uff61",
+                "valid": false
+            },
+            {
+                "description": "label too long if separator ignored (full stop)",
+                "data": "παράδειγμαπαράδειγμαπαράδειγμαπαράδειγμαπαράδειγμαπα.com",
+                "valid": true
+            },
+            {
+                "description": "label too long if separator ignored (ideographic full stop)",
+                "data": "παράδειγμαπαράδειγμαπαράδειγμαπαράδειγμαπαράδειγμαπα\u3002com",
+                "valid": true
+            },
+            {
+                "description": "label too long if separator ignored (fullwidth full stop)",
+                "data": "παράδειγμαπαράδειγμαπαράδειγμαπαράδειγμαπαράδειγμαπα\uff0ecom",
+                "valid": true
+            },
+            {
+                "description": "label too long if separator ignored (halfwidth ideographic full stop)",
+                "data": "παράδειγμαπαράδειγμαπαράδειγμαπαράδειγμαπαράδειγμαπα\uff61com",
+                "valid": true
             }
         ]
     }
diff --git a/tests/draft2020-12/optional/format/hostname.json b/tests/draft2020-12/optional/format/hostname.json
index 57827c4d..f4e93d45 100644
--- a/tests/draft2020-12/optional/format/hostname.json
+++ b/tests/draft2020-12/optional/format/hostname.json
@@ -130,6 +130,21 @@
                 "description": "single dot",
                 "data": ".",
                 "valid": false
+            },
+            {
+                "description": "leading dot",
+                "data": ".example",
+                "valid": false
+            },
+            {
+                "description": "trailing dot",
+                "data": "example.",
+                "valid": false
+            },
+            {
+                "description": "IDN label separator",
+                "data": "example\uff0ecom",
+                "valid": false
             }
         ]
     }
diff --git a/tests/draft2020-12/optional/format/idn-hostname.json b/tests/draft2020-12/optional/format/idn-hostname.json
index f42ae969..3bb59820 100644
--- a/tests/draft2020-12/optional/format/idn-hostname.json
+++ b/tests/draft2020-12/optional/format/idn-hostname.json
@@ -383,6 +383,66 @@
                 "description": "halfwidth ideographic full stop as label separator",
                 "data": "a\uff61b",
                 "valid": true
+            },
+            {
+                "description": "leading dot",
+                "data": ".example",
+                "valid": false
+            },
+            {
+                "description": "leading ideographic full stop",
+                "data": "\u3002example",
+                "valid": false
+            },
+            {
+                "description": "leading fullwidth full stop",
+                "data": "\uff0eexample",
+                "valid": false
+            },
+            {
+                "description": "leading halfwidth ideographic full stop",
+                "data": "\uff61example",
+                "valid": false
+            },
+            {
+                "description": "trailing dot",
+                "data": "example.",
+                "valid": false
+            },
+            {
+                "description": "trailing ideographic full stop",
+                "data": "example\u3002",
+                "valid": false
+            },
+            {
+                "description": "trailing fullwidth full stop",
+                "data": "example\uff0e",
+                "valid": false
+            },
+            {
+                "description": "trailing halfwidth ideographic full stop",
+                "data": "example\uff61",
+                "valid": false
+            },
+            {
+                "description": "label too long if separator ignored (full stop)",
+                "data": "παράδειγμαπαράδειγμαπαράδειγμαπαράδειγμαπαράδειγμαπα.com",
+                "valid": true
+            },
+            {
+                "description": "label too long if separator ignored (ideographic full stop)",
+                "data": "παράδειγμαπαράδειγμαπαράδειγμαπαράδειγμαπαράδειγμαπα\u3002com",
+                "valid": true
+            },
+            {
+                "description": "label too long if separator ignored (fullwidth full stop)",
+                "data": "παράδειγμαπαράδειγμαπαράδειγμαπαράδειγμαπαράδειγμαπα\uff0ecom",
+                "valid": true
+            },
+            {
+                "description": "label too long if separator ignored (halfwidth ideographic full stop)",
+                "data": "παράδειγμαπαράδειγμαπαράδειγμαπαράδειγμαπαράδειγμαπα\uff61com",
+                "valid": true
             }
         ]
     }
diff --git a/tests/draft4/optional/format/hostname.json b/tests/draft4/optional/format/hostname.json
index 866a6178..e4bc4c88 100644
--- a/tests/draft4/optional/format/hostname.json
+++ b/tests/draft4/optional/format/hostname.json
@@ -122,6 +122,21 @@
                 "description": "single dot",
                 "data": ".",
                 "valid": false
+            },
+            {
+                "description": "leading dot",
+                "data": ".example",
+                "valid": false
+            },
+            {
+                "description": "trailing dot",
+                "data": "example.",
+                "valid": false
+            },
+            {
+                "description": "IDN label separator",
+                "data": "example\uff0ecom",
+                "valid": false
             }
         ]
     }
diff --git a/tests/draft6/optional/format/hostname.json b/tests/draft6/optional/format/hostname.json
index 866a6178..e4bc4c88 100644
--- a/tests/draft6/optional/format/hostname.json
+++ b/tests/draft6/optional/format/hostname.json
@@ -122,6 +122,21 @@
                 "description": "single dot",
                 "data": ".",
                 "valid": false
+            },
+            {
+                "description": "leading dot",
+                "data": ".example",
+                "valid": false
+            },
+            {
+                "description": "trailing dot",
+                "data": "example.",
+                "valid": false
+            },
+            {
+                "description": "IDN label separator",
+                "data": "example\uff0ecom",
+                "valid": false
             }
         ]
     }
diff --git a/tests/draft7/optional/format/hostname.json b/tests/draft7/optional/format/hostname.json
index 866a6178..e4bc4c88 100644
--- a/tests/draft7/optional/format/hostname.json
+++ b/tests/draft7/optional/format/hostname.json
@@ -122,6 +122,21 @@
                 "description": "single dot",
                 "data": ".",
                 "valid": false
+            },
+            {
+                "description": "leading dot",
+                "data": ".example",
+                "valid": false
+            },
+            {
+                "description": "trailing dot",
+                "data": "example.",
+                "valid": false
+            },
+            {
+                "description": "IDN label separator",
+                "data": "example\uff0ecom",
+                "valid": false
             }
         ]
     }
diff --git a/tests/draft7/optional/format/idn-hostname.json b/tests/draft7/optional/format/idn-hostname.json
index 5c8cdc77..53faa396 100644
--- a/tests/draft7/optional/format/idn-hostname.json
+++ b/tests/draft7/optional/format/idn-hostname.json
@@ -372,6 +372,66 @@
                 "description": "halfwidth ideographic full stop as label separator",
                 "data": "a\uff61b",
                 "valid": true
+            },
+            {
+                "description": "leading dot",
+                "data": ".example",
+                "valid": false
+            },
+            {
+                "description": "leading ideographic full stop",
+                "data": "\u3002example",
+                "valid": false
+            },
+            {
+                "description": "leading fullwidth full stop",
+                "data": "\uff0eexample",
+                "valid": false
+            },
+            {
+                "description": "leading halfwidth ideographic full stop",
+                "data": "\uff61example",
+                "valid": false
+            },
+            {
+                "description": "trailing dot",
+                "data": "example.",
+                "valid": false
+            },
+            {
+                "description": "trailing ideographic full stop",
+                "data": "example\u3002",
+                "valid": false
+            },
+            {
+                "description": "trailing fullwidth full stop",
+                "data": "example\uff0e",
+                "valid": false
+            },
+            {
+                "description": "trailing halfwidth ideographic full stop",
+                "data": "example\uff61",
+                "valid": false
+            },
+            {
+                "description": "label too long if separator ignored (full stop)",
+                "data": "παράδειγμαπαράδειγμαπαράδειγμαπαράδειγμαπαράδειγμαπα.com",
+                "valid": true
+            },
+            {
+                "description": "label too long if separator ignored (ideographic full stop)",
+                "data": "παράδειγμαπαράδειγμαπαράδειγμαπαράδειγμαπαράδειγμαπα\u3002com",
+                "valid": true
+            },
+            {
+                "description": "label too long if separator ignored (fullwidth full stop)",
+                "data": "παράδειγμαπαράδειγμαπαράδειγμαπαράδειγμαπαράδειγμαπα\uff0ecom",
+                "valid": true
+            },
+            {
+                "description": "label too long if separator ignored (halfwidth ideographic full stop)",
+                "data": "παράδειγμαπαράδειγμαπαράδειγμαπαράδειγμαπαράδειγμαπα\uff61com",
+                "valid": true
             }
         ]
     }
diff --git a/tests/v1/format/hostname.json b/tests/v1/format/hostname.json
index 1b75d36e..a2eaebad 100644
--- a/tests/v1/format/hostname.json
+++ b/tests/v1/format/hostname.json
@@ -130,6 +130,21 @@
                 "description": "single dot",
                 "data": ".",
                 "valid": false
+            },
+            {
+                "description": "leading dot",
+                "data": ".example",
+                "valid": false
+            },
+            {
+                "description": "trailing dot",
+                "data": "example.",
+                "valid": false
+            },
+            {
+                "description": "IDN label separator",
+                "data": "example\uff0ecom",
+                "valid": false
             }
         ]
     }
diff --git a/tests/v1/format/idn-hostname.json b/tests/v1/format/idn-hostname.json
index 3b9fc094..08e9191b 100644
--- a/tests/v1/format/idn-hostname.json
+++ b/tests/v1/format/idn-hostname.json
@@ -383,6 +383,66 @@
                 "description": "halfwidth ideographic full stop as label separator",
                 "data": "a\uff61b",
                 "valid": true
+            },
+            {
+                "description": "leading dot",
+                "data": ".example",
+                "valid": false
+            },
+            {
+                "description": "leading ideographic full stop",
+                "data": "\u3002example",
+                "valid": false
+            },
+            {
+                "description": "leading fullwidth full stop",
+                "data": "\uff0eexample",
+                "valid": false
+            },
+            {
+                "description": "leading halfwidth ideographic full stop",
+                "data": "\uff61example",
+                "valid": false
+            },
+            {
+                "description": "trailing dot",
+                "data": "example.",
+                "valid": false
+            },
+            {
+                "description": "trailing ideographic full stop",
+                "data": "example\u3002",
+                "valid": false
+            },
+            {
+                "description": "trailing fullwidth full stop",
+                "data": "example\uff0e",
+                "valid": false
+            },
+            {
+                "description": "trailing halfwidth ideographic full stop",
+                "data": "example\uff61",
+                "valid": false
+            },
+            {
+                "description": "label too long if separator ignored (full stop)",
+                "data": "παράδειγμαπαράδειγμαπαράδειγμαπαράδειγμαπαράδειγμαπα.com",
+                "valid": true
+            },
+            {
+                "description": "label too long if separator ignored (ideographic full stop)",
+                "data": "παράδειγμαπαράδειγμαπαράδειγμαπαράδειγμαπαράδειγμαπα\u3002com",
+                "valid": true
+            },
+            {
+                "description": "label too long if separator ignored (fullwidth full stop)",
+                "data": "παράδειγμαπαράδειγμαπαράδειγμαπαράδειγμαπαράδειγμαπα\uff0ecom",
+                "valid": true
+            },
+            {
+                "description": "label too long if separator ignored (halfwidth ideographic full stop)",
+                "data": "παράδειγμαπαράδειγμαπαράδειγμαπαράδειγμαπαράδειγμαπα\uff61com",
+                "valid": true
             }
         ]
     }