Get nmap.

C:\nmap-3.45>nmap -sP 10.10.10.0/24

Starting nmap 3.45 ( http://www.insecure.org/nmap ) at 2003-09-25 22:24 Pacific
Daylight Time
Host ricin (10.10.10.1) appears to be up.
Host chiana (10.10.10.16) appears to be up.
Host isabel (10.10.10.18) appears to be up.
Host 10.10.10.100 appears to be up.
Host tivo2 (10.10.10.151) appears to be up.
Host riocar (10.10.10.201) appears to be up.
Host guardian (10.10.10.254) appears to be up.
Host 10.10.10.255 seems to be a subnet broadcast address (returned 6 extra pings).
Nmap run completed -- 256 IP addresses (7 hosts up) scanned in 14.841 seconds

C:\nmap-3.45>arp -a

Interface: 10.10.10.12 --- 0x10004
Internet Address Physical Address Type
10.10.10.1 00-a0-cc-58-d5-9c dynamic
10.10.10.16 00-a0-cc-58-b5-95 dynamic
10.10.10.18 00-30-48-21-5a-b8 dynamic
10.10.10.100 00-04-5a-f6-17-3c dynamic
10.10.10.151 00-0b-ad-21-d9-03 dynamic
10.10.10.201 00-02-d7-26-0b-0e dynamic
10.10.10.254 00-50-da-65-cb-de dynamic
_________________________
Donato
MkII/080000565
MkIIa/010101253
ricin.us