nmap -sP 192.168.28.0/24

Starting Nmap 6.47 ( http://nmap.org ) at 2015-12-24 00:36 EST
Nmap scan report for 192.168.28.1
Host is up (0.00036s latency).
MAC Address: 00:50:56:C0:00:01 (VMware)
Nmap scan report for 192.168.28.131
Host is up (0.00026s latency).
MAC Address: 00:0C:29:AC:48:C5 (VMware)
Nmap scan report for 192.168.28.254
Host is up (0.00013s latency).
MAC Address: 00:50:56:FA:84:CA (VMware)
Nmap scan report for 192.168.28.128
Host is up.
Nmap done: 256 IP addresses (4 hosts up) scanned in 28.04 seconds