Scanning with nmap

For local subnet
nmap [-n] -sP -PR -T[4,5] --max-retries[0,1]
-- host - timeout 4000 -oG *.*.*.*

For scans on routable subnet (icmp echo)
nmap [-n] -sP -PE -T[4,5] --max-retries [0,1]
--host-timeout 10000 -oG *.*.*.*

Red is for recommended value