DNS Protocol
Returns domain name.
Returns: dns_domainname_tReturns TRUE if it is of AAAA record type.
Returns: bool_atReturns TRUE if it is of ANY record type.
Returns: bool_atReturns TRUE if it is of A record type.
Returns: bool_atReturns TRUE if it is of CNAME record type.
Returns: bool_atReturns TRUE if it is of MX record type.
Returns: bool_atReturns TRUE if it is of NS record type.
Returns: bool_atReturns TRUE if it is of PTR record type.
Returns: bool_atReturns TRUE if it is of SOA record type.
Returns: bool_atReturns TRUE if it is of SRV record type.
Returns: bool_at