我的网络管理员为 thedigitalteacher.com 创建了一个 DNS 记录，其中应该包括指向 5.10.124.142 的域根的 A 记录，这确实是我在使用内部名称服务器时得到的响应。
然而，谷歌在 8.8.8.8 上的名称服务器经常（但并非总是）无法解析名称，导致这种废话：
ahrcsdca01115:triangle-app bodeng$ nslookup
> server 8.8.8.8
Default server: 8.8.8.8
Address: 8.8.8.8#53
> thedigitalteacher.com
Server: 8.8.8.8
Address: 8.8.8.8#53
** server can't find thedigitalteacher.com: NXDOMAIN
> set querytype=any
> thedigitalteacher.com
Server: 8.8.8.8
Address: 8.8.8.8#53
Non-authoritative answer:
Name: thedigitalteacher.com
Address: 5.10.124.142
thedigitalteacher.com nameserver = ns0.dcdns.net.
thedigitalteacher.com nameserver = ns1.dcdns.net.
thedigitalteacher.com nameserver = ns2.dcdns.net.
thedigitalteacher.com nameserver = ns3.dcdns.net.
thedigitalteacher.com
origin = ns0.dcdns.net
mail addr = domains.ucles.org.uk
serial = 22
refresh = 900 …