From bb4fc8e2f73880c984bc44ba41cbc4433c6b43ec Mon Sep 17 00:00:00 2001
From: Didnelpsun <2675350965@qq.com>
Date: Thu, 18 Nov 2021 23:40:00 +0800
Subject: [PATCH] Update 3-network-layer.md

---
 Computer-Network/3-network-layer.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Computer-Network/3-network-layer.md b/Computer-Network/3-network-layer.md
index cc4330d..2316363 100644
--- a/Computer-Network/3-network-layer.md
+++ b/Computer-Network/3-network-layer.md
@@ -610,7 +610,7 @@ $IP$组播地址能让源设备能将分组发送给一组设备，属于多播
 
 ### 硬件组播
 
-同单播地址一样，组播$IP$地址也需要对应的组播$MAC$地址在本地网络中实际传输帧。组播$MAC$地址以十六进制值$01-00-5E$开头，余下的六个十六进制位根据$IP$组播组地址的最后$23$位转换而成，第$9$位为$0$。
+同单播地址一样，组播$IP$地址也需要对应的组播$MAC$地址在本地网络中实际传输帧。组播$MAC$地址以十六进制值$01-00-5E$开头，即范围为$01-00-5E-00-00-00\sim01-00-53-7F-FF-FF$，余下的六个十六进制位根据$IP$组播组地址的最后$23$位转换而成，第$9$位为$0$。
 
 ![硬件组播][hardwaremulticast]