gh-155836: Fix IPv6Address.reverse_pointer for addresses with a scope id

_reverse_pointer derives from self.exploded, which since gh-88178 carries
the %scope_id suffix. Strip the scope id before building the pointer so it
is not spliced into the reversed nibbles.

Author: tonghuaroot

Lib/ipaddress.py

@@ -1930,7 +1930,11 @@ def _reverse_pointer(self):
         This implements the method described in RFC3596 2.5.
 
         """
-        reverse_chars = self.exploded[::-1].replace(':', '')
+        exploded = self.exploded
+        scope_id = getattr(self, '_scope_id', None)
+        if scope_id:
+            exploded = exploded.replace('%' + scope_id, '', 1)
+        reverse_chars = exploded[::-1].replace(':', '')
         return '.'.join(reverse_chars) + '.ip6.arpa'
 
     @staticmethod

Lib/test/test_ipaddress.py

@@ -2763,6 +2763,14 @@ def testReversePointer(self):
                     '2.0.0.0.1.0.0.0.0.0.0.0.1.2.3.4.'
                     'ip6.arpa'
                 )
+             ),
+            # a scope id is not part of the pointer name
+            (
+                'fe80::1%eth0', (
+                    '1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.'
+                    '0.0.0.0.0.0.0.0.0.0.0.0.0.8.e.f.'
+                    'ip6.arpa'
+                )
              )
         ]:
             with self.subTest('ipv6_reverse_pointer', addr=addr_v6):

Misc/NEWS.d/next/Library/2026-08-15-10-00-00.gh-issue-155836.Rv6Ptr.rst

@@ -0,0 +1,3 @@
+Fix :attr:`ipaddress.IPv6Address.reverse_pointer` returning an invalid name
+for an address carrying a scope id; the scope id is no longer spliced into the
+reverse DNS pointer.