$ time /usr/local/sbin/fping -r1 -g 10.100.19.1/24 -a 2> /dev/null
10.100.19.1
10.100.19.50
10.100.19.85
10.100.19.87
10.100.19.200

real	0m18.816s
user	0m0.010s
sys	0m0.000s