diff --git a/cmd/utils/flags.go b/cmd/utils/flags.go
index b539ae6dfb..f079df83b9 100644
--- a/cmd/utils/flags.go
+++ b/cmd/utils/flags.go
@@ -760,7 +760,7 @@ var (
 	}
 	NATFlag = &cli.StringFlag{
 		Name:     "nat",
-		Usage:    "NAT port mapping mechanism (any|none|upnp|pmp|pmp:<IP>|extip:<IP>|stun:default|stun:<IP:PORT>)",
+		Usage:    "NAT port mapping mechanism (any|none|upnp|pmp|pmp:<IP>|extip:<IP>|stun:<IP:PORT>)",
 		Value:    "any",
 		Category: flags.NetworkingCategory,
 	}
diff --git a/p2p/nat/nat.go b/p2p/nat/nat.go
index 659f424f7b..5f7af7424d 100644
--- a/p2p/nat/nat.go
+++ b/p2p/nat/nat.go
@@ -59,7 +59,7 @@ type Interface interface {
 //	"upnp"               uses the Universal Plug and Play protocol
 //	"pmp"                uses NAT-PMP with an auto-detected gateway address
 //	"pmp:192.168.0.1"    uses NAT-PMP with the given gateway address
-//	"stun:default"       uses stun protocol with default stun server
+//	"stun"       uses stun protocol with default stun server
 //	"stun:192.168.0.1:1234"   uses stun protocol with stun server address 192.168.0.1:1234
 func Parse(spec string) (Interface, error) {
 	var (
diff --git a/p2p/nat/stun.go b/p2p/nat/stun.go
index 17e5d9b2d8..36d54398b5 100644
--- a/p2p/nat/stun.go
+++ b/p2p/nat/stun.go
@@ -1,4 +1,4 @@
-// Copyright 2024 The go-ethereum Authors
+// Copyright 2025 The go-ethereum Authors
 // This file is part of the go-ethereum library.
 //
 // The go-ethereum library is free software: you can redistribute it and/or modify
@@ -42,7 +42,7 @@ type stun struct {
 
 func newSTUN(serverAddr string) (Interface, error) {
 	s := new(stun)
-	if serverAddr == "default" || serverAddr == "" {
+	if serverAddr == "" {
 		s.serverList = strings.Split(stunDefaultServers, "\n")
 	} else {
 		_, err := net.ResolveUDPAddr("udp4", serverAddr)
diff --git a/p2p/nat/stun_test.go b/p2p/nat/stun_test.go
index fe16ecdeb3..b5f429986c 100644
--- a/p2p/nat/stun_test.go
+++ b/p2p/nat/stun_test.go
@@ -1,3 +1,19 @@
+// Copyright 2025 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
 package nat
 
 import (
@@ -7,7 +23,7 @@ import (
 )
 
 func TestNatStun(t *testing.T) {
-	nat, err := newSTUN("default")
+	nat, err := newSTUN("")
 	assert.NoError(t, err)
 	_, err = nat.ExternalIP()
 	assert.NoError(t, err)