diff --git a/django/core/validators.py b/django/core/validators.py
index 731ccf2d46..e085cd0641 100644
--- a/django/core/validators.py
+++ b/django/core/validators.py
@@ -87,7 +87,7 @@ class URLValidator(RegexValidator):
         r'^(?:[a-z0-9.+-]*)://'  # scheme is validated separately
         r'(?:[^\s:@/]+(?::[^\s:@/]*)?@)?'  # user:pass authentication
         r'(?:' + ipv4_re + '|' + ipv6_re + '|' + host_re + ')'
-        r'(?::\d{2,5})?'  # port
+        r'(?::\d{1,5})?'  # port
         r'(?:[/?#][^\s]*)?'  # resource path
         r'\Z', re.IGNORECASE)
     message = _('Enter a valid URL.')
@@ -129,7 +129,7 @@ class URLValidator(RegexValidator):
                 raise
         else:
             # Now verify IPv6 in the netloc part
-            host_match = re.search(r'^\[(.+)\](?::\d{2,5})?$', urlsplit(value).netloc)
+            host_match = re.search(r'^\[(.+)\](?::\d{1,5})?$', urlsplit(value).netloc)
             if host_match:
                 potential_ip = host_match[1]
                 try:
diff --git a/tests/validators/invalid_urls.txt b/tests/validators/invalid_urls.txt
index 4db8326ca1..8a04800d85 100644
--- a/tests/validators/invalid_urls.txt
+++ b/tests/validators/invalid_urls.txt
@@ -60,6 +60,7 @@ http://1.2.03.4
 http://1.2.3.04
 http://.www.foo.bar/
 http://.www.foo.bar./
+http://[::1:2::3]:8/
 http://[::1:2::3]:8080/
 http://[]
 http://[]:8080
diff --git a/tests/validators/valid_urls.txt b/tests/validators/valid_urls.txt
index 0df2239978..1420d727a8 100644
--- a/tests/validators/valid_urls.txt
+++ b/tests/validators/valid_urls.txt
@@ -2,6 +2,8 @@ http://www.djangoproject.com/
 HTTP://WWW.DJANGOPROJECT.COM/
 http://localhost/
 http://example.com/
+http://example.com:0
+http://example.com:0/
 http://example.com:65535
 http://example.com:65535/
 http://example.com./
@@ -37,6 +39,8 @@ http://userid:@example.com:8080
 http://userid:@example.com:8080/
 http://userid:password@example.com
 http://userid:password@example.com/
+http://userid:password@example.com:8
+http://userid:password@example.com:8/
 http://userid:password@example.com:8080
 http://userid:password@example.com:8080/
 http://userid:password@example.com:65535