checkdnsrr -- Check DNS records corresponding to a given Internet host name or IP address
dns_get_record -- Fetch DNS Resource Records associated with a hostname
gethostbyname -- Get the IP address corresponding to a given Internet host name
getmxrr -- Get MX records corresponding to a given Internet host name
getprotobyname -- Get protocol number associated with protocol name
getprotobynumber -- Get protocol name associated with protocol number
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