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int checkdnsrr
(string host, string [
type
]);
Searches DNS for records of type type corresponding to host . Returns true if any records are found; returns false if no records were found or if an error occurred.
type may be any one of: A, MX, NS, SOA, PTR, CNAME, or ANY. The default is MX.
host may either be the IP address in dotted-quad notation or the host name.
See also getmxrr() , gethostbyaddr() , gethostbyname() , gethostbynamel() , and the named(8) manual page.