This scan only finds which targets are up and does not port scan them.

sudo nmap -sn 192.168.1.69

result:

Starting Nmap 6.40 ( http://nmap.org ) at 2016-07-08 01:57 BST
Nmap scan report for peter-laptop-1 (192.168.1.69)
Host is up.
Nmap done: 1 IP address (1 host up) scanned in 0.00 seconds