check all host's in network

┌─[marek@lati]─[~/projekty/python]
└──╼ nmap -sP 192.168.1.0/24

Starting Nmap 6.47 ( http://nmap.org ) at 2015-12-28 23:18 CET
Nmap scan report for 192.168.1.1
Host is up (0.0045s latency).
Nmap scan report for 192.168.1.16
Host is up (0.0011s latency).
Nmap scan report for 192.168.1.47
Host is up (0.059s latency).
Nmap scan report for 192.168.1.213
Host is up (0.00021s latency).
Nmap done: 256 IP addresses (4 hosts up) scanned in 2.71 seconds


we can also use:

[root@virt ~]# arp-scan --interface=enp0s9 --localnet
Interface: enp0s9, datalink type: EN10MB (Ethernet)
Starting arp-scan 1.8.4 with 256 hosts (http://www.nta-monitor.com/tools/arp-scan/)
192.168.1.1     a0:c5:62:72:c6:00       (Unknown)
192.168.1.16    34:7a:60:d4:e4:43       (Unknown)
192.168.1.54    a4:34:d9:46:9b:c3       (Unknown)
192.168.1.243   78:40:e4:f9:a5:32       (Unknown)

4 packets received by filter, 0 packets dropped by kernel
Ending arp-scan 1.8.4: 256 hosts scanned in 1.906 seconds (134.31 hosts/sec). 4 responded