Scan a whole subnet or IP range with Nmap by providing the '*' wildcard with it.
nmap 192.168.1.*
result:
Starting Nmap 6.40 ( http://nmap.org ) at 2016-07-07 23:41 BST Nmap scan report for router.asus.com (192.168.1.1) Host is up (0.016s latency). Not shown: 544 closed ports, 453 filtered ports PORT STATE SERVICE 53/tcp open domain 80/tcp open http 9998/tcp open distinct32 Nmap scan report for 192.168.1.2 Host is up (0.0081s latency). Not shown: 987 closed ports PORT STATE SERVICE 21/tcp open ftp 22/tcp open ssh 25/tcp open smtp 53/tcp open domain 80/tcp open http 110/tcp open pop3 139/tcp open netbios-ssn 143/tcp open imap 443/tcp open https 445/tcp open microsoft-ds 587/tcp open submission 993/tcp open imaps 995/tcp open pop3s Nmap scan report for peter-laptop-1 (192.168.1.69) Host is up (0.00028s 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 (0.071s 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 scan report for android-d8443dafc4d5d365 (192.168.1.141) Host is up (0.083s latency). All 1000 scanned ports on android-d8443dafc4d5d365 (192.168.1.141) are closed Nmap scan report for RP-AC52 (192.168.1.169) Host is up (0.047s latency). Not shown: 998 closed ports PORT STATE SERVICE 53/tcp open domain 80/tcp open http Nmap done: 256 IP addresses (6 hosts up) scanned in 77.55 seconds