shell:$ nslookup -timeout=2 -retry=1 'baharnet.ir'
Server: 75.98.161.224
Address: 75.98.161.224#53
Non-authoritative answer:
Name: baharnet.ir
Address: 104.21.76.88
Name: baharnet.ir
Address: 172.67.191.154
;; Got SERVFAIL reply from 75.98.161.224, trying next server
;; Got SERVFAIL reply from 69.39.86.5
** server can't find baharnet.ir: SERVFAIL
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