diff --git a/src/PhpSpreadsheet/Cell/Coordinate.php b/src/PhpSpreadsheet/Cell/Coordinate.php
index 9aa879c3..50678397 100644
--- a/src/PhpSpreadsheet/Cell/Coordinate.php
+++ b/src/PhpSpreadsheet/Cell/Coordinate.php
@@ -183,12 +183,12 @@ abstract class Coordinate
     /**
      * Calculate range boundaries.
      *
-     * @param string $range Cell range (e.g. A1:A1)
+     * @param string $range Cell range, Single Cell, Row/Column Range (e.g. A1:A1, B2, B:C, 2:3)
      *
      * @return array Range coordinates [Start Cell, End Cell]
      *                    where Start Cell and End Cell are arrays (Column Number, Row Number)
      */
-    public static function rangeBoundaries($range)
+    public static function rangeBoundaries(string $range): array
     {
         // Ensure $pRange is a valid range
         if (empty($range)) {
@@ -205,6 +205,16 @@ abstract class Coordinate
             [$rangeA, $rangeB] = explode(':', $range);
         }
 
+        if (is_numeric($rangeA) && is_numeric($rangeB)) {
+            $rangeA = 'A' . $rangeA;
+            $rangeB = AddressRange::MAX_COLUMN . $rangeB;
+        }
+
+        if (ctype_alpha($rangeA) && ctype_alpha($rangeB)) {
+            $rangeA = $rangeA . '1';
+            $rangeB = $rangeB . AddressRange::MAX_ROW;
+        }
+
         // Calculate range outer borders
         $rangeStart = self::coordinateFromString($rangeA);
         $rangeEnd = self::coordinateFromString($rangeB);
@@ -219,7 +229,7 @@ abstract class Coordinate
     /**
      * Calculate range dimension.
      *
-     * @param string $range Cell range (e.g. A1:A1)
+     * @param string $range Cell range, Single Cell, Row/Column Range (e.g. A1:A1, B2, B:C, 2:3)
      *
      * @return array Range dimension (width, height)
      */
@@ -234,29 +244,19 @@ abstract class Coordinate
     /**
      * Calculate range boundaries.
      *
-     * @param string $range Cell range (e.g. A1:A1)
+     * @param string $range Cell range, Single Cell, Row/Column Range (e.g. A1:A1, B2, B:C, 2:3)
      *
      * @return array Range coordinates [Start Cell, End Cell]
      *                    where Start Cell and End Cell are arrays [Column ID, Row Number]
      */
     public static function getRangeBoundaries($range)
     {
-        // Ensure $pRange is a valid range
-        if (empty($range)) {
-            $range = self::DEFAULT_RANGE;
-        }
+        [$rangeA, $rangeB] = self::rangeBoundaries($range);
 
-        // Uppercase coordinate
-        $range = strtoupper($range);
-
-        // Extract range
-        if (strpos($range, ':') === false) {
-            $rangeA = $rangeB = $range;
-        } else {
-            [$rangeA, $rangeB] = explode(':', $range);
-        }
-
-        return [self::coordinateFromString($rangeA), self::coordinateFromString($rangeB)];
+        return [
+            [self::stringFromColumnIndex($rangeA[0]), $rangeA[1]],
+            [self::stringFromColumnIndex($rangeB[0]), $rangeB[1]],
+        ];
     }
 
     /**
diff --git a/tests/data/CellGetRangeBoundaries.php b/tests/data/CellGetRangeBoundaries.php
index ff434796..7a56b4c0 100644
--- a/tests/data/CellGetRangeBoundaries.php
+++ b/tests/data/CellGetRangeBoundaries.php
@@ -2,29 +2,45 @@
 
 return [
     [
-        [
-            [
-                'B',
-                4,
-            ],
-            [
-                'E',
-                9,
-            ],
+        'Cell Range' => [
+            ['B', 4],
+            ['E', 9],
         ],
         'B4:E9',
     ],
-    [
+    'Single Cell' => [
         [
-            [
-                'B',
-                4,
-            ],
-            [
-                'B',
-                4,
-            ],
+            ['B', 4],
+            ['B', 4],
         ],
         'B4',
     ],
+    'Column Range' => [
+        [
+            ['B', 1],
+            ['C', 1048576],
+        ],
+        'B:C',
+    ],
+    'Single Column Range' => [
+        [
+            ['B', 1],
+            ['B', 1048576],
+        ],
+        'B:B',
+    ],
+    'Row Range' => [
+        [
+            ['A', 2],
+            ['XFD', 3],
+        ],
+        '2:3',
+    ],
+    'Single Row Range' => [
+        [
+            ['A', 2],
+            ['XFD', 2],
+        ],
+        '2:2',
+    ],
 ];
diff --git a/tests/data/CellRangeBoundaries.php b/tests/data/CellRangeBoundaries.php
index 9e856ced..882f437c 100644
--- a/tests/data/CellRangeBoundaries.php
+++ b/tests/data/CellRangeBoundaries.php
@@ -1,30 +1,46 @@
 <?php
 
 return [
-    [
+    'Cell Range' => [
         [
-            [
-                2,
-                4,
-            ],
-            [
-                5,
-                9,
-            ],
+            [2, 4],
+            [5, 9],
         ],
         'B4:E9',
     ],
-    [
+    'Single Cell' => [
         [
-            [
-                2,
-                4,
-            ],
-            [
-                2,
-                4,
-            ],
+            [2, 4],
+            [2, 4],
         ],
         'B4',
     ],
+    'Column Range' => [
+        [
+            [2, 1],
+            [3, 1048576],
+        ],
+        'B:C',
+    ],
+    'Single Column Range' => [
+        [
+            [2, 1],
+            [2, 1048576],
+        ],
+        'B:B',
+    ],
+    'Row Range' => [
+        [
+            [1, 2],
+            [16384, 3],
+        ],
+        '2:3',
+    ],
+    'Single Row Range' => [
+        [
+            [1, 2],
+            [16384, 2],
+        ],
+        '2:2',
+    ],
 ];