diff --git a/data/cncity/110100.txt b/data/cncity/110100.txt
index 2886203f..07749598 100644
--- a/data/cncity/110100.txt
+++ b/data/cncity/110100.txt
@@ -121,7 +121,6 @@
 202.205.80.0/20
 203.93.194.0/24
 203.99.16.0/22
-203.99.21.0/24
 203.99.28.0/23
 203.100.80.0/21
 203.100.88.0/22