diff --git a/tests/draft-next/optional/format/hostname.json b/tests/draft-next/optional/format/hostname.json
index bc3a60dc..13349021 100644
--- a/tests/draft-next/optional/format/hostname.json
+++ b/tests/draft-next/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/draft-next/optional/format/idn-hostname.json b/tests/draft-next/optional/format/idn-hostname.json
index 1061f424..1fb2576a 100644
--- a/tests/draft-next/optional/format/idn-hostname.json
+++ b/tests/draft-next/optional/format/idn-hostname.json
@@ -383,6 +383,86 @@
                 "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": "dot separator with label that is too long when separator is ignored",
+                "data": "παράδειγμαπαράδειγμαπαράδειγμαπαράδειγμαπαράδειγμαπαράδειγμα.com",
+                "valid": true
+            },
+            {
+                "description": "ideographic full stop separator with label that is too long when separator is ignored",
+                "data": "παράδειγμαπαράδειγμαπαράδειγμαπαράδειγμαπαράδειγμαπαράδειγμα\u3002com",
+                "valid": true
+            },
+            {
+                "description": "fullwidth full stop separator with label that is too long when separator is ignored",
+                "data": "παράδειγμαπαράδειγμαπαράδειγμαπαράδειγμαπαράδειγμαπαράδειγμα\uff0ecom",
+                "valid": true
+            },
+            {
+                "description": "halfwidth ideographic full stop separator with label that is too long when separator is ignored",
+                "data": "παράδειγμαπαράδειγμαπαράδειγμαπαράδειγμαπαράδειγμαπαράδειγμα\uff61com",
+                "valid": true
+            },
+            {
+                "description": "dot separator with label that is too long when separator is respected",
+                "data": "παράδειγμαπαράδειγμαπαράδειγμαπαράδειγμαπαράδειγμαπαράδειγμαπαράδειγμα.com",
+                "valid": false
+            },
+            {
+                "description": "ideographic full stop separator with label that is too long when separator is respected",
+                "data": "παράδειγμαπαράδειγμαπαράδειγμαπαράδειγμαπαράδειγμαπαράδειγμαπαράδειγμα\u3002com",
+                "valid": false
+            },
+            {
+                "description": "fullwidth full stop separator with label that is too long when separator is respected",
+                "data": "παράδειγμαπαράδειγμαπαράδειγμαπαράδειγμαπαράδειγμαπαράδειγμαπαράδειγμα\uff0ecom",
+                "valid": false
+            },
+            {
+                "description": "halfwidth ideographic full stop separator with label that is too long when separator is respected",
+                "data": "παράδειγμαπαράδειγμαπαράδειγμαπαράδειγμαπαράδειγμαπαράδειγμαπαράδειγμα\uff61com",
+                "valid": false
             }
         ]
     }
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..efb2d444 100644
--- a/tests/draft2019-09/optional/format/idn-hostname.json
+++ b/tests/draft2019-09/optional/format/idn-hostname.json
@@ -383,6 +383,86 @@
                 "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": "dot separator with label that is too long when separator is ignored",
+                "data": "παράδειγμαπαράδειγμαπαράδειγμαπαράδειγμαπαράδειγμαπαράδειγμα.com",
+                "valid": true
+            },
+            {
+                "description": "ideographic full stop separator with label that is too long when separator is ignored",
+                "data": "παράδειγμαπαράδειγμαπαράδειγμαπαράδειγμαπαράδειγμαπαράδειγμα\u3002com",
+                "valid": true
+            },
+            {
+                "description": "fullwidth full stop separator with label that is too long when separator is ignored",
+                "data": "παράδειγμαπαράδειγμαπαράδειγμαπαράδειγμαπαράδειγμαπαράδειγμα\uff0ecom",
+                "valid": true
+            },
+            {
+                "description": "halfwidth ideographic full stop separator with label that is too long when separator is ignored",
+                "data": "παράδειγμαπαράδειγμαπαράδειγμαπαράδειγμαπαράδειγμαπαράδειγμα\uff61com",
+                "valid": true
+            },
+            {
+                "description": "dot separator with label that is too long when separator is respected",
+                "data": "παράδειγμαπαράδειγμαπαράδειγμαπαράδειγμαπαράδειγμαπαράδειγμαπαράδειγμα.com",
+                "valid": false
+            },
+            {
+                "description": "ideographic full stop separator with label that is too long when separator is respected",
+                "data": "παράδειγμαπαράδειγμαπαράδειγμαπαράδειγμαπαράδειγμαπαράδειγμαπαράδειγμα\u3002com",
+                "valid": false
+            },
+            {
+                "description": "fullwidth full stop separator with label that is too long when separator is respected",
+                "data": "παράδειγμαπαράδειγμαπαράδειγμαπαράδειγμαπαράδειγμαπαράδειγμαπαράδειγμα\uff0ecom",
+                "valid": false
+            },
+            {
+                "description": "halfwidth ideographic full stop separator with label that is too long when separator is respected",
+                "data": "παράδειγμαπαράδειγμαπαράδειγμαπαράδειγμαπαράδειγμαπαράδειγμαπαράδειγμα\uff61com",
+                "valid": false
             }
         ]
     }
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..cf72409c 100644
--- a/tests/draft2020-12/optional/format/idn-hostname.json
+++ b/tests/draft2020-12/optional/format/idn-hostname.json
@@ -383,6 +383,86 @@
                 "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": "dot separator with label that is too long when separator is ignored",
+                "data": "παράδειγμαπαράδειγμαπαράδειγμαπαράδειγμαπαράδειγμαπαράδειγμα.com",
+                "valid": true
+            },
+            {
+                "description": "ideographic full stop separator with label that is too long when separator is ignored",
+                "data": "παράδειγμαπαράδειγμαπαράδειγμαπαράδειγμαπαράδειγμαπαράδειγμα\u3002com",
+                "valid": true
+            },
+            {
+                "description": "fullwidth full stop separator with label that is too long when separator is ignored",
+                "data": "παράδειγμαπαράδειγμαπαράδειγμαπαράδειγμαπαράδειγμαπαράδειγμα\uff0ecom",
+                "valid": true
+            },
+            {
+                "description": "halfwidth ideographic full stop separator with label that is too long when separator is ignored",
+                "data": "παράδειγμαπαράδειγμαπαράδειγμαπαράδειγμαπαράδειγμαπαράδειγμα\uff61com",
+                "valid": true
+            },
+            {
+                "description": "dot separator with label that is too long when separator is respected",
+                "data": "παράδειγμαπαράδειγμαπαράδειγμαπαράδειγμαπαράδειγμαπαράδειγμαπαράδειγμα.com",
+                "valid": false
+            },
+            {
+                "description": "ideographic full stop separator with label that is too long when separator is respected",
+                "data": "παράδειγμαπαράδειγμαπαράδειγμαπαράδειγμαπαράδειγμαπαράδειγμαπαράδειγμα\u3002com",
+                "valid": false
+            },
+            {
+                "description": "fullwidth full stop separator with label that is too long when separator is respected",
+                "data": "παράδειγμαπαράδειγμαπαράδειγμαπαράδειγμαπαράδειγμαπαράδειγμαπαράδειγμα\uff0ecom",
+                "valid": false
+            },
+            {
+                "description": "halfwidth ideographic full stop separator with label that is too long when separator is respected",
+                "data": "παράδειγμαπαράδειγμαπαράδειγμαπαράδειγμαπαράδειγμαπαράδειγμαπαράδειγμα\uff61com",
+                "valid": false
             }
         ]
     }
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..0fd86f00 100644
--- a/tests/draft7/optional/format/idn-hostname.json
+++ b/tests/draft7/optional/format/idn-hostname.json
@@ -372,6 +372,86 @@
                 "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": "dot separator with label that is too long when separator is ignored",
+                "data": "παράδειγμαπαράδειγμαπαράδειγμαπαράδειγμαπαράδειγμαπαράδειγμα.com",
+                "valid": true
+            },
+            {
+                "description": "ideographic full stop separator with label that is too long when separator is ignored",
+                "data": "παράδειγμαπαράδειγμαπαράδειγμαπαράδειγμαπαράδειγμαπαράδειγμα\u3002com",
+                "valid": true
+            },
+            {
+                "description": "fullwidth full stop separator with label that is too long when separator is ignored",
+                "data": "παράδειγμαπαράδειγμαπαράδειγμαπαράδειγμαπαράδειγμαπαράδειγμα\uff0ecom",
+                "valid": true
+            },
+            {
+                "description": "halfwidth ideographic full stop separator with label that is too long when separator is ignored",
+                "data": "παράδειγμαπαράδειγμαπαράδειγμαπαράδειγμαπαράδειγμαπαράδειγμα\uff61com",
+                "valid": true
+            },
+            {
+                "description": "dot separator with label that is too long when separator is respected",
+                "data": "παράδειγμαπαράδειγμαπαράδειγμαπαράδειγμαπαράδειγμαπαράδειγμαπαράδειγμα.com",
+                "valid": false
+            },
+            {
+                "description": "ideographic full stop separator with label that is too long when separator is respected",
+                "data": "παράδειγμαπαράδειγμαπαράδειγμαπαράδειγμαπαράδειγμαπαράδειγμαπαράδειγμα\u3002com",
+                "valid": false
+            },
+            {
+                "description": "fullwidth full stop separator with label that is too long when separator is respected",
+                "data": "παράδειγμαπαράδειγμαπαράδειγμαπαράδειγμαπαράδειγμαπαράδειγμαπαράδειγμα\uff0ecom",
+                "valid": false
+            },
+            {
+                "description": "halfwidth ideographic full stop separator with label that is too long when separator is respected",
+                "data": "παράδειγμαπαράδειγμαπαράδειγμαπαράδειγμαπαράδειγμαπαράδειγμαπαράδειγμα\uff61com",
+                "valid": false
             }
         ]
     }