A more powerful ping which can ping multiple hosts.
# To list alive hosts within a subnet generated from a netmask:
fping -a -g 192.168.1.0/24
# To list alive hosts within a subnet generated from an IP range:
fping -a -g 192.168.1.1 192.168.1.254
# To list unreachable hosts within a subnet generated from a netmask:
fping -u -g 192.168.1.0/24