diff --git a/README.md b/README.md
index 3e4caed..bbd381a 100644
--- a/README.md
+++ b/README.md
@@ -15,7 +15,7 @@
 | CT220                | tailescale             | 192.168.1.220      |
 | PC                   |                        | 192.168.10.200     |
 
-- **サブネット**: `192.168.0.1/20` (`255.255.250.0`)
+- **サブネット**: `192.168.0.0/20` (`255.255.250.0`)
 - **ゲートウェイ**: `192.168.0.1`
 
 ---