shell:$ nslookup -timeout=2 -retry=1 'ns1.tdc.sd'
Server: 75.98.161.224
Address: 75.98.161.224#53
Non-authoritative answer:
Name: ns1.tdc.sd
Address: 196.10.53.72
;; communications error to 75.98.161.224#53: timed out
;; communications error to 69.39.86.5#53: timed out
;; no servers could be reached
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