Note: I didn't notice in time I needed the homework network for this, so can't give any results. The output is example output from another network, at my home.

# nmap -sP 192.168.84.1/24

Starting Nmap 6.47 ( http://nmap.org ) at 2015-09-24 22:29 CEST
Nmap scan report for ZyXEL.Home (192.168.84.1)
Host is up (0.0034s latency).
MAC Address: 4C:9E:FF:C5:63:E1 (ZyXEL Communications)
Nmap scan report for 192.168.84.66
Host is up (0.056s latency).
MAC Address: A0:E4:53:44:EB:DA (Sony Mobile Communications AB)
Nmap scan report for 192.168.84.68
Host is up (0.0093s latency).
MAC Address: 94:3B:B1:28:D8:6D (Kaonmedia)
Nmap scan report for 192.168.84.70
Host is up (0.0097s latency).
MAC Address: B8:27:EB:22:C0:0E (Raspberry Pi Foundation)
Nmap scan report for 192.168.84.75
Host is up.
Nmap done: 256 IP addresses (5 hosts up) scanned in 1.76 seconds