shell:$ nslookup -timeout=2 -retry=1 'mtwitter.com'
;; Got SERVFAIL reply from 75.98.161.224, trying next server
Server: 69.39.86.5
Address: 69.39.86.5#53
Non-authoritative answer:
Name: mtwitter.com
Address: 103.224.182.217
;; Got SERVFAIL reply from 75.98.161.224, trying next server
;; Got SERVFAIL reply from 69.39.86.5
** server can't find mtwitter.com: SERVFAIL
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