How to Async DNS Lookup in Tcl - Code Snippet

# Task: Async DNS Lookup
# Language: Tcl

proc async_dns_lookup() {
    # Implementation for Async DNS Lookup
    set result = ...; # Initialize variable
    # TODO: Implement core logic here
    # Step 1: Prepare data
    # Step 2: Process Async DNS Lookup
    puts("Done");
}