最近用阿里公共DNS223.5.5.5，发现wifi状态下广发信用卡APP登录不上，显示无网络，换4G网络后可以登录，修改wifi状态下DNS为1.2.4.8后可以正常登录。随后查看DNS解析记录，发现下列域名无法正常解析出IP地址
sbzw.cgbchina.com.cn
cbae.cgbchina.com.cn
ebank.cgbchina.com.cn
8.95508.com
static.95508.com
mps.95508.com
2020.7.3恢复正常
$ nslookup 8.95508.com 223.5.5.5
服务器: public1.alidns.com
Address: 223.5.5.5
DNS request timed out.
timeout was 2 seconds.
DNS request timed out.
timeout was 2 seconds.
DNS request timed out.
timeout was 2 seconds.
DNS request timed out.
timeout was 2 seconds.
*** 请求 public1.alidns.com 超时
$ nslookup 8.95508.com 223.6.6.6
服务器: public2.alidns.com
Address: 223.6.6.6
DNS request timed out.
timeout was 2 seconds.
DNS request timed out.
timeout was 2 seconds.
DNS request timed out.
timeout was 2 seconds.
DNS request timed out.
timeout was 2 seconds.
*** 请求 public2.alidns.com 超时
$ nslookup 8.95508.com 1.2.4.8
服务器: public1.sdns.cn
Address: 1.2.4.8
非权威应答:
名称: 8.95508.com
Address: 14.23.106.12
$ nslookup static.95508.com 223.6.6.6
服务器: public2.alidns.com
Address: 223.6.6.6
DNS request timed out.
timeout was 2 seconds.
DNS request timed out.
timeout was 2 seconds.
DNS request timed out.
timeout was 2 seconds.
DNS request timed out.
timeout was 2 seconds.
*** 请求 public2.alidns.com 超时
$ nslookup static.95508.com 1.2.4.8
服务器: public1.sdns.cn
Address: 1.2.4.8
非权威应答:
名称: static.95508.com.wswebpic.com
Addresses: 183.131.168.174
115.231.31.15
183.131.168.173
Aliases: static.95508.com
$ nslookup static.95508.com 223.5.5.5
服务器: public1.alidns.com
Address: 223.5.5.5
DNS request timed out.
timeout was 2 seconds.
DNS request timed out.
timeout was 2 seconds.
DNS request timed out.
timeout was 2 seconds.
*** 请求 public1.alidns.com 超时
$ nslookup www.qq.com 223.5.5.5
服务器: public1.alidns.com
Address: 223.5.5.5
非权威应答:
名称: public-v6.sparta.mig.tencent-cloud.net
Addresses: 240e:ff:f101:10::14d
240e:ff:f101:10::15f
113.96.232.215
14.18.175.154
Aliases: www.qq.com
$ nslookup mps.95508.com 223.5.5.5
服务器: public1.alidns.com
Address: 223.5.5.5
DNS request timed out.
timeout was 2 seconds.
DNS request timed out.
timeout was 2 seconds.
DNS request timed out.
timeout was 2 seconds.
DNS request timed out.
timeout was 2 seconds.
*** 请求 public1.alidns.com 超时
$ nslookup ebank.cgbchina.com.cn 223.5.5.5
服务器: public1.alidns.com
Address: 223.5.5.5
DNS request timed out.
timeout was 2 seconds.
DNS request timed out.
timeout was 2 seconds.
DNS request timed out.
timeout was 2 seconds.
DNS request timed out.
timeout was 2 seconds.
*** 请求 public1.alidns.com 超时