diff --git a/spindle/netguard/netguard.go b/spindle/netguard/netguard.go
index 30a7721e..8e8d959c 100644
--- a/spindle/netguard/netguard.go
+++ b/spindle/netguard/netguard.go
@@ -31,7 +31,8 @@ var BlockedRoutes = []string{
 	"::/128",          // unspecified address
 	"::1/128",         // loopback
 	"::ffff:0:0/96",   // ipv4-mapped addresses
-	"64:ff9b::/96",    // ipv4/ipv6 translation prefix
+	"64:ff9b::/96",    // well-known ipv4/ipv6 translation prefix
+	"64:ff9b:1::/48",  // local-use ipv4/ipv6 translation prefix
 	"100::/64",        // discard-only prefix
 	"2001::/23",       // ietf protocol assignments
 	"2001:db8::/32",   // documentation / examples