Scan multiple hosts by simply writing their IP addresses or hostnames with Nmap.

nmap 192.168.1.69 192.168.1.100

result:

Starting Nmap 6.40 ( http://nmap.org ) at 2016-07-07 23:37 BST
Nmap scan report for peter-laptop-1 (192.168.1.69)
Host is up (0.00016s latency).
Not shown: 997 closed ports
PORT    STATE SERVICE
80/tcp  open  http
139/tcp open  netbios-ssn
445/tcp open  microsoft-ds
 
Nmap scan report for 192.168.1.100
Host is up (0.029s latency).
Not shown: 989 closed ports
PORT     STATE SERVICE
80/tcp   open  http
139/tcp  open  netbios-ssn
443/tcp  open  https
445/tcp  open  microsoft-ds
515/tcp  open  printer
631/tcp  open  ipp
6839/tcp open  unknown
7435/tcp open  unknown
8080/tcp open  http-proxy
9100/tcp open  jetdirect
9220/tcp open  unknown
 
Nmap done: 2 IP addresses (2 hosts up) scanned in 2.13 seconds