Traces the paths to targets without doing a full port scan on them.

sudo nmap -sn --traceroute 192.168.1.2

result:

Starting Nmap 6.40 ( http://nmap.org ) at 2016-07-08 02:07 BST
Nmap scan report for 192.168.1.2
Host is up (0.0024s latency).
MAC Address: 44:A8:42:34:16:49 (Unknown)
 
TRACEROUTE
HOP RTT     ADDRESS
1   2.43 ms 192.168.1.2
 
Nmap done: 1 IP address (1 host up) scanned in 0.26 seconds