Find mobile device on network

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http://serverfault.com – I'm trying to write a small program that will poll the network for certian ip addresses or mac addresses (though mac doesnt seem to show up past my WAP) My networking isn't very strong but many mobile devices don't support ping on the network (im looking at you iphone) is there a fairly easily to poll all network addresses on the network regardless if they will reply to ping? (HowTos)