DNSLookup Constructor

DNSLookup Constructor looks up a requested record on a given server. The lookup is done in the constructor itself. If there is any error, an exception is throw.

public DNSLookup(
   string query,
   int qtype,
   int qclass,
   int timeout,
   string server
);

Parameters

query: The string indicating the hostname/domainname/ipaddress for which the record lookup will be done.
qtype: The Record type that needs to be looked up. QTYPE_A is for address, QTYPE_NS if for Name server, QTYPE_MX for Mail Exchange....
qclass: The Record scheme on which the lookup should be performed. The most widely used scheme is Internet ( QCLASS_IN ).
timeout: The Timeout in milliseconds to wait for the response from the server. If reponse is not recived with the timeout period, a SocketTimeoutException is thrown.
server: The Domain Name Server on which the lookup has to be performed. This could be a hostname or a IP address. If null can be passed, the DNS setting from the system would be used.

Exceptions

Exception Type	Condition
SocketException	If a reponse is not received within the timeout period.
Exception	If the Name Server can't be determined or any other internal problem occurs.

DNSLookup Constructor

Parameters

Exceptions

See Also