diff --git a/components/http_foundation.rst b/components/http_foundation.rst
index aa2c7a78224..ef26ecfbb56 100644
--- a/components/http_foundation.rst
+++ b/components/http_foundation.rst
@@ -361,6 +361,23 @@ analysis purposes. Use the ``anonymize()`` method from the
$anonymousIpv6 = IpUtils::anonymize($ipv6);
// $anonymousIpv6 = '2a01:198:603:10::'
+Check if an IP belongs to a private subnet
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+If you need to know if an IP address belongs to a private subnet, you can
+use the ``isPrivateIp()`` method from the
+:class:`Symfony\\Component\\HttpFoundation\\IpUtils` to do that::
+
+ use Symfony\Component\HttpFoundation\IpUtils;
+
+ $ipv4 = '192.168.1.1';
+ $isPrivate = IpUtils::isPrivateIp($ipv4);
+ // $isPrivate = true
+
+ $ipv6 = '2a01:198:603:10:396e:4789:8e99:890f';
+ $isPrivate = IpUtils::isPrivateIp($ipv6);
+ // $isPrivate = false
+
Accessing other Data
~~~~~~~~~~~~~~~~~~~~
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