Any way to get all the Ethernet or token ring NIC addresses ?

You could use dhcpcmd from the Server ResKit to do something like the following:
C:>dhcpcmd 10.10.10.1 enumclients 10.10.10.0 -h
DHCP Server version 4.1
1        10.10.10.2       JETIE            00a0c9c72624
2        10.10.10.3       98Workstation    00a0ffff16fe
 

Any way to get all the Ethernet or token ring
NIC addresses ??
C:> FOR /L %i IN (1,1,255) DO ping -n 1 203.97.160.%i
c:> arp -a>mac.txt
output is …..   (numbers replaced with x’s)
Interface: xxx.xx.xx.111 on Interface 0x2
Internet Address      Physical Address      Type
xxx.xx.xx.6          00-20-af-64-03-53     dynamic
xxx.xx.xx.12         00-80-5f-bd-68-36     dynamic
 

FOR /L %i IN (1,1,255) DO ping -n 1 192.168.%i