Quoting the CkSocket C++ Reference Documentation (here):
TCP socket component with SSL capability. Supports both asynchronous connect, accept, send, and read operations in all programming languages. The ActiveX and .NET socket components also include heartbeat, completion, and other events when blocking methods are called. DNS and reverse DNS is support in both synchronous and asynchronous modes. Supports the ability to abort all operations: connect, accept, send, receive, DNS lookups, etc. prior to completion.
However, I don't see any Reverse DNS methods listed in the documentation. Is reverse DNS lookup supported or am I missing something?