SRV Format (II)
_whois._tcp IN SRV 0 0 43 whois.nic.example.
Name of the service: “whois” (vs “nicname”, cf. RFC 954)
43 as of RFC 3232
_whois._tcp IN SRV 0 0 0 .
“If there is precisely one SRV RR, and its target is "." (the root domain), abort.”
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