ip.pa. 21600 IN NS ns1.mmrnet.org.
ip.pa. 21600 IN NS ns2.mmrnet.org.
ping -4 ns1.mmrnet.org
PING (106.54.89.88) 56(84) bytes of data.
64 bytes from 106.54.89.88 (106.54.89.88): icmp_seq=1 ttl=48 time=943 ms
64 bytes from 106.54.89.88 (106.54.89.88): icmp_seq=3 ttl=48 time=943 ms
NS 延迟高丢包多,解析一次要很久
100.189.50.117.in-addr.arpa. 120 IN PTR nbghnbk.cn.
100.189.50.117.in-addr.arpa. 120 IN PTR cetzcqn.cn.
100.189.50.117.in-addr.arpa. 120 IN PTR irhchr.top.
另外这个 PTR 有多个记录,感觉很随意,是不是玩具性质的?