diff --git a/sentry/sentry.conf.example.py b/sentry/sentry.conf.example.py
index 38147f7bb02..76362e98ef9 100644
--- a/sentry/sentry.conf.example.py
+++ b/sentry/sentry.conf.example.py
@@ -103,6 +103,60 @@ def get_internal_network():
 # AI model prices from various public APIs.
 SENTRY_AIR_GAP = False
 
+# As of 25.9.0 (September 2025 release), Sentry enforces tighter restrictions
+# of allowed IP addresses for outgoing requests. This is to prevent
+# accidentally leaking sensitive information to third parties.
+# By default, Sentry will not allow requests to private IP addresses.
+# You can override this by configuring the allowed IP addresses here.
+SENTRY_DISALLOWED_IPS: tuple[str, ...] = (
+    # https://en.wikipedia.org/wiki/Reserved_IP_addresses#IPv4
+    "0.0.0.0/8",
+    "10.0.0.0/8",
+    "100.64.0.0/10",
+    "127.0.0.0/8",
+    "169.254.0.0/16",
+    "172.16.0.0/12",
+    "192.0.0.0/29",
+    "192.0.2.0/24",
+    "192.88.99.0/24",
+    "192.168.0.0/16",
+    "198.18.0.0/15",
+    "198.51.100.0/24",
+    "224.0.0.0/4",
+    "240.0.0.0/4",
+    "255.255.255.255/32",
+    # https://en.wikipedia.org/wiki/IPv6#IPv4-mapped_IPv6_addresses
+    # Subnets match the IPv4 subnets above
+    "::ffff:0:0/104",
+    "::ffff:a00:0/104",
+    "::ffff:6440:0/106",
+    "::ffff:7f00:0/104",
+    "::ffff:a9fe:0/112",
+    "::ffff:ac10:0/108",
+    "::ffff:c000:0/125",
+    "::ffff:c000:200/120",
+    "::ffff:c058:6300/120",
+    "::ffff:c0a8:0/112",
+    "::ffff:c612:0/111",
+    "::ffff:c633:6400/120",
+    "::ffff:e000:0/100",
+    "::ffff:f000:0/100",
+    "::ffff:ffff:ffff/128",
+    # https://en.wikipedia.org/wiki/Reserved_IP_addresses#IPv6
+    "::1/128",
+    "::ffff:0:0/96",
+    "64:ff9b::/96",
+    "64:ff9b:1::/48",
+    "100::/64",
+    "2001:0000::/32",
+    "2001:20::/28",
+    "2001:db8::/32",
+    "2002::/16",
+    "fc00::/7",
+    "fe80::/10",
+    "ff00::/8",
+)
+
 ################
 # Node Storage #
 ################