Netcat Portscanner
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with netcat
- nc -zv 10.11.12.3 20-81
10.11.12.3 [10.11.12.3] 80 (http) open 10.11.12.3 [10.11.12.3] 53 (domain) open 10.11.12.3 [10.11.12.3] 25 (smtp) open 10.11.12.3 [10.11.12.3] 21 (ftp) open
script with netcat
#!/bin/bash
test $# -eq "3" || { echo "usage: $0 IP PORTSTART PORTEND" ; exit 1 ;}
for ((x=$2;x<=$3;x++))
do
nc -w 1 -z $1 $x && echo "$x open"
done