diff --git a/data/inetnum/172.21.74.128_25 b/data/inetnum/172.21.74.128_25
index 9f8c3e55b..58c0f67a5 100644
--- a/data/inetnum/172.21.74.128_25
+++ b/data/inetnum/172.21.74.128_25
@@ -1,6 +1,6 @@
 inetnum:            172.21.64.0 - 172.21.127.255
-cidr:               172.21.64.0/18
-netname:            ZHYZ-DN42
+cidr:               172.21.64.0/25
+netname:            ZHYZ-IPV4
 descr:              zhihuiyuze native address space
 remarks:            The ip segment of zhihuiyuze mail:zhihuiyuze@qq.com
 mnt-by:             ZHYZ-MNT
@@ -8,4 +8,4 @@ status:             ALLOCATED
 source:             DN42
 country:            CN
 admin-c:            ZHYZ-DN42
-tech-c:             ZHYZ-DN42
\ No newline at end of file
+tech-c:             ZHYZ-DN42