diff --git a/system/HTTP/Request.php b/system/HTTP/Request.php
index afb0b22ad5d0..baf60c0305b6 100644
--- a/system/HTTP/Request.php
+++ b/system/HTTP/Request.php
@@ -11,7 +11,6 @@
 
 namespace CodeIgniter\HTTP;
 
-use CodeIgniter\Validation\FormatRules;
 use Config\App;
 
 /**
@@ -50,21 +49,6 @@ public function __construct($config = null) // @phpstan-ignore-line
         }
     }
 
-    /**
-     * Validate an IP address
-     *
-     * @param string $ip    IP Address
-     * @param string $which IP protocol: 'ipv4' or 'ipv6'
-     *
-     * @deprecated 4.0.5 Use Validation instead
-     *
-     * @codeCoverageIgnore
-     */
-    public function isValidIP(?string $ip = null, ?string $which = null): bool
-    {
-        return (new FormatRules())->valid_ip($ip, $which);
-    }
-
     /**
      * Get the request method.
      *
diff --git a/system/HTTP/RequestInterface.php b/system/HTTP/RequestInterface.php
index 367c494928b8..cb55ccb5bff4 100644
--- a/system/HTTP/RequestInterface.php
+++ b/system/HTTP/RequestInterface.php
@@ -26,16 +26,6 @@ interface RequestInterface extends OutgoingRequestInterface
      */
     public function getIPAddress(): string;
 
-    /**
-     * Validate an IP address
-     *
-     * @param string $ip    IP Address
-     * @param string $which IP protocol: 'ipv4' or 'ipv6'
-     *
-     * @deprecated Use Validation instead
-     */
-    public function isValidIP(string $ip, ?string $which = null): bool;
-
     /**
      * Fetch an item from the $_SERVER array.
      * Supplied by RequestTrait.
diff --git a/tests/system/HTTP/CLIRequestTest.php b/tests/system/HTTP/CLIRequestTest.php
index 1298df1b9ad3..e15f0fca4f87 100644
--- a/tests/system/HTTP/CLIRequestTest.php
+++ b/tests/system/HTTP/CLIRequestTest.php
@@ -517,64 +517,6 @@ public function testFetchGlobalWithEmptyNotation(): void
         $this->assertSame($expected, $this->request->fetchGlobal('post', 'clients[]'));
     }
 
-    public static function provideValidIPAddress(): iterable
-    {
-        return [
-            'empty' => [
-                false,
-                '',
-            ],
-            'zero' => [
-                false,
-                0,
-            ],
-            'large_ipv4' => [
-                false,
-                '256.256.256.999',
-                'ipv4',
-            ],
-            'good_ipv4' => [
-                true,
-                '100.100.100.0',
-                'ipv4',
-            ],
-            'good_default' => [
-                true,
-                '100.100.100.0',
-            ],
-            'zeroed_ipv4' => [
-                true,
-                '0.0.0.0',
-            ],
-            'large_ipv6' => [
-                false,
-                'h123:0000:0000:0000:0000:0000:0000:0000',
-                'ipv6',
-            ],
-            'good_ipv6' => [
-                true,
-                '2001:0db8:85a3:0000:0000:8a2e:0370:7334',
-            ],
-            'confused_ipv6' => [
-                false,
-                '255.255.255.255',
-                'ipv6',
-            ],
-        ];
-    }
-
-    /**
-     * @dataProvider provideValidIPAddress
-     *
-     * @param mixed      $expected
-     * @param mixed      $address
-     * @param mixed|null $type
-     */
-    public function testValidIPAddress($expected, $address, $type = null): void
-    {
-        $this->assertSame($expected, $this->request->isValidIP($address, $type));
-    }
-
     public function testGetIPAddressDefault(): void
     {
         $this->assertSame('0.0.0.0', $this->request->getIPAddress());
diff --git a/tests/system/HTTP/RequestTest.php b/tests/system/HTTP/RequestTest.php
index 621227c4b888..be20b4ff8f5b 100644
--- a/tests/system/HTTP/RequestTest.php
+++ b/tests/system/HTTP/RequestTest.php
@@ -533,64 +533,6 @@ public function testFetchGlobalFiltersWithArrayChildElement(): void
         $this->assertSame($expected, $this->request->fetchGlobal('post', 'people[0]', FILTER_VALIDATE_INT));
     }
 
-    public static function provideValidIPAddress(): iterable
-    {
-        return [
-            'empty' => [
-                false,
-                '',
-            ],
-            'zero' => [
-                false,
-                0,
-            ],
-            'large_ipv4' => [
-                false,
-                '256.256.256.999',
-                'ipv4',
-            ],
-            'good_ipv4' => [
-                true,
-                '100.100.100.0',
-                'ipv4',
-            ],
-            'good_default' => [
-                true,
-                '100.100.100.0',
-            ],
-            'zeroed_ipv4' => [
-                true,
-                '0.0.0.0',
-            ],
-            'large_ipv6' => [
-                false,
-                'h123:0000:0000:0000:0000:0000:0000:0000',
-                'ipv6',
-            ],
-            'good_ipv6' => [
-                true,
-                '2001:0db8:85a3:0000:0000:8a2e:0370:7334',
-            ],
-            'confused_ipv6' => [
-                false,
-                '255.255.255.255',
-                'ipv6',
-            ],
-        ];
-    }
-
-    /**
-     * @dataProvider provideValidIPAddress
-     *
-     * @param mixed      $expected
-     * @param mixed      $address
-     * @param mixed|null $type
-     */
-    public function testValidIPAddress($expected, $address, $type = null): void
-    {
-        $this->assertSame($expected, $this->request->isValidIP($address, $type));
-    }
-
     public function testGetIPAddressDefault(): void
     {
         $this->assertSame('0.0.0.0', $this->request->getIPAddress());
diff --git a/user_guide_src/source/changelogs/v4.5.0.rst b/user_guide_src/source/changelogs/v4.5.0.rst
index 48cd6ddf2ca2..fb0ab21a3734 100644
--- a/user_guide_src/source/changelogs/v4.5.0.rst
+++ b/user_guide_src/source/changelogs/v4.5.0.rst
@@ -136,7 +136,9 @@ Spark Commands
 Others
 ------
 
-- **IncomingRequest::** The visibility of the deprecated properties ``$uri`` and
+- **IncomingRequest:** The visibility of the deprecated properties ``$uri`` and
+- **RequestInterface:** The deprecated ``isValidIP()`` method has been removed.
+- **Request:** The deprecated ``isValidIP()`` method has been removed.
   ``$config`` has been changed to protected.
 - **Config:** The deprecated ``CodeIgniter\Config\Config`` class has been removed.