nmap -T4 -A -v -iR 1000

Starting Nmap 7.12 ( https://nmap.org )
NSE: Loaded 138 scripts for scanning.
NSE: Script Pre-scanning.
Initiating NSE at 08:48
Completed NSE at 08:48, 0.00s elapsed
Initiating NSE at 08:48
Completed NSE at 08:48, 0.00s elapsed
Initiating Ping Scan at 08:48
Scanning 1000 hosts

Nmap done: 1056 IP addresses scanned in 14486.68 seconds
Raw packets sent: 252137 (11.381MB) | Rcvd: 387821 (36.462MB)