Get the port number on the switch , if you stack you should get the switch number as well

You can use show int to list all the interfaces , get the switch port value e.g. gi/1/0.8

Use sh int gi1/0/8 to list the port details to make sure its up etc

Next run :

Source code

show mac address-table int gi1/0/8show mac address-table | include aaaa.bbbb.cccc

( copy the address it gives you Address )

Next Run this

Source code

show arp | incl %macaddressofabove%

If it doesn’t show anything the device might not have an IP ( check port is on correct Vlan )

** A cheat , on a computer connected to the switch on the same Vlan and IP range , you can manually add an IP to the mac address then try and ping/access the device :

In Windows Xp

Source code

arp -s %spareip% %macAddress%

In Windows 7

Source code

netsh -c interface ipv4 add neighbors “Network Card Name” “IP Address” “MAC Address”