v2ex 的 dns 第一个无法 ping 通是啥情况？

V2EX = way to explore

V2EX 是一个关于分享和探索的地方

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这是一个创建于 3551 天前的主题，其中的信息可能已经有所发展或是发生改变。

我小白，只有第二个能ping通，正常不？
Stevens-MacBook-Air:~ Steven$ ping 199.91.73.222
PING 199.91.73.222 (199.91.73.222): 56 data bytes
Request timeout for icmp_seq 0
Request timeout for icmp_seq 1
Request timeout for icmp_seq 2
Request timeout for icmp_seq 3
Request timeout for icmp_seq 4
^Z
[3]+ Stopped ping 199.91.73.222
Stevens-MacBook-Air:~ Steven$ ping 178.79.131.110
PING 178.79.131.110 (178.79.131.110): 56 data bytes
64 bytes from 178.79.131.110: icmp_seq=0 ttl=45 time=371.472 ms
64 bytes from 178.79.131.110: icmp_seq=1 ttl=45 time=306.751 ms
64 bytes from 178.79.131.110: icmp_seq=2 ttl=45 time=385.611 ms
64 bytes from 178.79.131.110: icmp_seq=3 ttl=45 time=403.375 ms
64 bytes from 178.79.131.110: icmp_seq=4 ttl=45 time=420.791 ms
64 bytes from 178.79.131.110: icmp_seq=5 ttl=45 time=338.698 ms
64 bytes from 178.79.131.110: icmp_seq=6 ttl=45 time=358.588 ms
64 bytes from 178.79.131.110: icmp_seq=7 ttl=45 time=309.159 ms
64 bytes from 178.79.131.110: icmp_seq=8 ttl=45 time=313.347 ms
64 bytes from 178.79.131.110: icmp_seq=9 ttl=45 time=420.936 ms
64 bytes from 178.79.131.110: icmp_seq=10 ttl=45 time=345.122 ms
64 bytes from 178.79.131.110: icmp_seq=11 ttl=45 time=362.778 ms
^Z
[4]+ Stopped ping 178.79.131.110

目前尚无回复

ttl=45 bytes timeout