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Cisco Switches/Stacks and Finding connected devices IP's

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Of course the ICMP protocol (Ping) is only going to propagate within a particular layer-3 subnet, so you would have to do the ping while connected to a particular VLAN to see what's in that VLAN. VLANs break up broadcast domains, so protocols like ICMP, ARP, and DHCP will, of course, only play within the walls of each VLAN.

Solarwinds makes a free IP address tracker which discovers and tracks IP addresses. There's also a product with a free trial called Orion IP Address Manager that will do this.