RustScan (11.4k ⭐) is a very fast and noisy port scanner designed for CTFs. You can scan all 65k ports in a few seconds.

It's not installed by default on Kali. First, search for the latest .deb that you can find on their release page.

$ # there wasn't the .deb for the latest
$ wget
$ sudo dpkg -i rustscan_2.0.1_amd64.deb

Basic usage

$ rustscan -a IP -p 21
$ rustscan -a IP -p 21,22,80
$ rustscan -a IP --range 1-1023
# add "--" before nmap options
$ rustscan -a IP -- -sC -A
$ rustscan -a IP -- -sV

Using --ulimit make it faster, but you will miss some ports.