Jfscan - A Super Fast And Customisable Port Scanner, Based On Masscan And NMap


Killing features

  • Scan with nmap fast! Allows you to scan targets with Masscan and run Nmap on discovered ports with possibility of custom options. Nmap on steroids. *
  • Allows to scan targets in multiple formats.
  • Can output results in domain:port format.
  • Works in stdin/stdout mode, so you can pipe results to other tools.

The JFScan (Just Fu*king Scan) is a wrapper around a super-fast port scanner Masscan. It's designed to simplify work when scanning for open ports on targets in mixed formats, inluding domain names. Some useful modules are included, such as modules for subdomain enumeration using Amass and crt.sh. The JFScan accepts a target in the following forms: URL, domain or IP (including CIDR). You can specify a file with targets using argument or just use stdin.

The JFScan also allows you to output only the results and chain it with other tools, for example Nuclei. The domain:port output of JFScan is crucial if you want to discover vulnerabilities in web applications as virtual host decides which content will be served.

Finally, it can scan discovered ports with Nmap, you can also define custom options and use Nmaps amazing scripting capabilities.

JFScans logic of input & output processing:


Please follow installation instructions before running. Do not run the JFScan under a root, it's not needed since we set a special permissions on the masscan binary.

usage: jfscan [-h] -t TARGETS [--resolvers RESOLVERS] [-m MODULES] (-p PORTS | -tp TOP_PORTS) [-r MAX_RATE] [-oi] [-od] [-q] [--nmap] [--nmap-options NMAP_OPTIONS] [--nmap-threads NMAP_THREADS] [--nmap-output NMAP_OUTPUT]

JFScan - Just Fu*king Scan

optional arguments:
-h, --help show this help message and exit
-t TARGETS, --targets TARGETS
list of targets, accepted form is: domain name, IPv4, IPv6, URL
--resolvers RESOLVERS
custom resolvers separated by a comma, e. g.,,
-m MODULES, --modules MODULES
modules separated by a comma, available modules: enum_amass, enum_crtsh
-p PORTS, --ports PORTS
ports, can be a range or port list: 0-65535 or 22,80,100-500,...
-tp TOP_PORTS, --top-ports TOP_PORTS
scan only N of the top ports, e. g., --top-ports 1000
-r MAX_RATE, --max-rate MAX_RATE
max kpps rate
interface for masscan and nmap to use
-oi, --only-ips output only IP adresses, default: all resources
-od, --only-domains output only domains, default: all resources
-q, --quite output only results

--nmap run nmap on discovered ports
--nmap-options NMAP_OPTIONS
nmap arguments, e. g., --nmap-options='-sV' or --nmap-options='-sV --script ssh-auth-methods'
--nmap-threads NMAP_THREADS
number of nmaps to run concurrently, default 8
--nmap-output NMAP_OUTPUT
path to save output file in XML format (same as nmap option -oX)


Scan targets for only for ports 80 and 443 with rate of 10 kpps:

$ jfscan -p 80,443 -t targets.txt -r 10000

Scan targets for only for ports 80 and 443 and utilize a crt.sh subdomain enumeration modules:

$ jfscan -p 80,443 -t targets.txt -m enum_crtsh

Scan targets for top 1000 ports and utilize crt.sh module:

$ jfscan --top-ports 1000 -t targets.txt -m enum_crtsh

You can also specify targets on stdin and pipe it to nuclei:

$ cat targets.txt | jfscan --top-ports 1000 -m enum_crtsh | httpx -silent | nuclei

Utilize nmap to gather more info about discovered services:

$ cat targets.txt | jfscan -p 0-65535 --nmap --nmap-options="-sV --scripts ssh-auth-methods"

The targets.txt can contain targets in the following forms:



  1. Before installation, make sure you have the latest version of Masscan installed (tested version is 1.3.2).

First, install a libpcap-dev (Debian based distro) or libcap-devel (Centos based distro):

sudo apt install libpcap-dev

Next, clone the official repository and install:

sudo apt-get --assume-yes install git make gcc
git clone https://github.com/robertdavidgraham/masscan
cd masscan
sudo make install
  1. The Masscan requires root permissions to run. Since running binaries under root is not good idea, we will set a CAP_NET_RAW capability to the binary:
sudo setcap CAP_NET_RAW+ep /usr/bin/masscan
  1. For installation of JFscan a python3 and pip3 is required.
sudo apt install python3 python3-pip
  1. Install JFScan:
$ git clone https://github.com/nullt3r/jfscan.git
$ cd jfscan
$ pip3 install .

If you can't run the jfscan directly from command line you should check if $HOME/.local/bin is in your path.

Add the following line to your ~/.zshrc or ~/.bashrc:

export PATH="$HOME/.local/bin:$PATH"
  1. Additional steps: For enum_amass module to work, install Amass:
snap install amass


Read file LICENSE.


I am not responsible for any damages. You are responsible for your own actions. Attacking targets without prior mutual consent is illegal.

Known issues

  • Running enum_amass will take forever if there is more then 10 domains on the input. Amass takes forever and sometimes fails... help me to resolve it :)

* When scanning smaller network ranges, you can just use nmap directly, there is no need to use JFScan. You can reach up to 70% of the speed of JFScan using the following options:

nmap -Pn -n -v yourTargetNetwork/26 -p- --min-parallelism 64 --min-rate 20000 --min-hostgroup 64 --randomize-hosts -sS -sV

As always, expect some false positivies/negatives.

Jfscan - A Super Fast And Customisable Port Scanner, Based On Masscan And NMap Jfscan - A Super Fast And Customisable Port Scanner, Based On Masscan And NMap Reviewed by Zion3R on 8:30 AM Rating: 5