wishlist item: paralellized list scan

[Alan Jenkins <sourcejedi () phonecoop coop>]

The list scan, nmap -sL, doesn't run in parallel - only one DNS query runs at 
a time.  It is potentially useful to to be able to scan a large network 
address space for machines with a registered hostname.

Is this technically feasible?
Would it be too much work to implement in nmap?

A little research suggests that nmap uses gethostbyaddr, which blocks until 
the host is resolved - and that therefore it would be necessary to send dns 
requests manually - perhaps after first looking in /etc/hosts (assuming using 
multiple threads or processes is not really an option)

Does anyone know a tool capable of doing this already?

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