diff --git a/django/core/validators.py b/django/core/validators.py
index 830b533848..a385819510 100644
--- a/django/core/validators.py
+++ b/django/core/validators.py
@@ -138,7 +138,7 @@ class URLValidator(RegexValidator):
         # section 3.1. It's defined to be 255 bytes or less, but this includes
         # one byte for the length of the name and one byte for the trailing dot
         # that's used to indicate absolute names in DNS.
-        if len(urlsplit(value).netloc) > 253:
+        if len(urlsplit(value).hostname) > 253:
             raise ValidationError(self.message, code=self.code, params={'value': value})
 
 
diff --git a/tests/validators/valid_urls.txt b/tests/validators/valid_urls.txt
index a3db587492..3f8bf839b0 100644
--- a/tests/validators/valid_urls.txt
+++ b/tests/validators/valid_urls.txt
@@ -35,6 +35,10 @@ http://userid:password@example.com
 http://userid:password@example.com/
 http://userid:password@example.com:8080
 http://userid:password@example.com:8080/
+https://userid:paaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaassword@example.com
+https://userid:paaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaassword@example.com:8080
+https://useridddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddd:password@example.com
+https://useriddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddd:password@example.com:8080
 http://142.42.1.1/
 http://142.42.1.1:8080/
 http://➡.ws/䨹