"Quickly" scan all ports for a big list of IPs with nmap, while avoiding being banned,

stealth-fast-nmap-scan.sh

#!/bin/bash
# by @nil0x42

shuf IP-LIST.TXT > /tmp/ips.txt # randomize ip-list
# for each port (in random order):
for i in {1..65535}; do echo $i; done | shuf | while read port; do
    # scan single port on every IP from randomized ip-list
    nmap -sS -PN -n --max-retries=0 --max-rtt-timeout=1000ms \
        --min-rate=10000 --min-hostgroup=4096 -iL /tmp/ips.txt -p $port
done

# details here: https://twitter.com/nil0x42/status/1432605540220297219