IdDNSResolver.pas contains Classes, Types, Procedures, and Functions needed to define and implement a UDP-based a resolver for DNS protocol queries. The DNS protocol is described in the Internet Standards documents:

• RFC 1034 - Domain Names Concepts and Facilities (http://www.rfc-editor.org/rfc/rfc1034.txt)

• RFC 1035 - Domain Names - Implementation and Specification (http://www.rfc-editor.org/rfc/rfc1035.txt)

• RFC 1591 - Domain Name System Structure and Delegation (http://www.rfc-editor.org/rfc/rfc1591.txt)

• RFC 1183 - New DNS RR Definitions (http://www.rfc-editor.org/rfc/rfc1183.txt)

• RFC 2181 - Clarifications to the DNS Specification. (http://www.rfc-editor.org/rfc/rfc2181.txt)