Cisco 6509 find the IP of a device connected to a known port

I know CISCO 6509 is an old device,  but as it happened to me to work on it today and I found no useful information in internet to solve my issue, maybe this post could help someone else

I connected a network device to a 6509 , port 4/8 and but then how to connect to it without the IP address? (ok I solved looking into the dhcp server, but then I found the cisco way)

1. show the MAC address connected to the port

sh cam dynamic | include 4/8

this was the result:

1     00-0a-b6-55-56-10             4/8 [ALL]

2. go to the Multilayer module (in my case is the module 15, use: sh module to check it)

session 15

3. display arp table filtering by the mac found at point 1 (pay attention, the format is different!)

sh arp | include 000e.b678.5620

the result:

Protocol Address Age Hardware address Type Interface

Internet     10.0.0.55          45        000a.b655.5610           ARPA   Vlan1

we just found the IP address of our device  -> 10.0.0.55