# Fast tools for ping sweeps

nmap

# apt-get install nmap
# nmap -n -sn -PE -T5 --max-retries 1 --min-parallelism 100 -iL subnets.txt

46432 IP addresses scanned in 72 seconds

# nmap -n -sn -PE -T5 --max-retries 0 --min-parallelism 100 -iL subnets.txt | grep -v Warning

46432 IP addresses scanned in 48 seconds

zmap

# wget https://github.com/zmap/zmap/archive/v1.0.0.tar.gz
# tar xvzf v1.0.0.tar.gz
# cd zmap-1.0.0
zmap-1.0.0# cat INSTALL
zmap-1.0.0# apt-get install libgmp3-dev gengetopt libpcap-dev
zmap-1.0.0# cd src
zmap-1.0.0/src# make
zmap-1.0.0/src# make install
zmap-1.0.0/src# cd
# rm -rf zmap-1.0.0 v1.0.0.tar.gz
# sed -i 's/^black/#black/' /etc/zmap/zmap.conf
# zmap -M icmp_echoscan -B 1G -P 1 -T 100 -w subnets.txt

46432 IP addresses scanned in 72 seconds