#docker #port #scan #tokio

app havn

A fast configurable port scanner with reasonable defaults

7 releases

0.1.6 Nov 17, 2023
0.1.5 Oct 9, 2023
0.1.4 Aug 25, 2023
0.1.3 Jul 30, 2023
0.1.1 May 21, 2023

#254 in Command line utilities

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98 downloads per month

MIT license

1.5K SLoC

Rust 1K SLoC // 0.0% comments Shell 259 SLoC // 0.1% comments


A fast configurable port scanner with reasonable defaults


havn - ˈheɪvən || "HAY" + "vuhn" - is a lightweight self-contained port scanning application written in Rust, using asynchronous Tokio multithreading to deliver fast and reliable results. With sensible defaults and configurable options, users are able customise the scanning process according to their needs. It is designed and built to be compatible with multiple platforms, including Docker, and has a binary size of less than 1mb.

Download & install


Published on crates.io, so if you have cargo installed, simply run

cargo install havn


Published on Docker Hub and ghcr.io, with images built for linux/amd64, linux/arm64, and linux/arm/v6

via Docker Hub

docker run --rm -it mrjackwills/havn:latest #[options]

via ghcr.io

docker run --rm -it ghcr.io/mrjackwills/havn:latest #[options]

❗Caution: To scan the Docker host itself, you must grant access by including the option:



See the pre-built binaries

or, download & install (x86_64 one liner)

wget https://www.github.com/mrjackwills/havn/releases/latest/download/havn_linux_x86_64.tar.gz &&
tar xzvf havn_linux_x86_64.tar.gz havn &&
install -Dm 755 havn -t "${HOME}/.local/bin" &&
rm havn_linux_x86_64.tar.gz havn

or, for automatic platform selection, download, and installation (to $HOME/.local/bin)

One should always verify script content before running in a shell

curl https://raw.githubusercontent.com/mrjackwills/havn/main/install.sh | bash


havn #[options]

Available command line arguments

argument result
[string] The address or IP to scan. [default:]
-a Scan every port, from 1 to 65535, conflicts with -p
-c [number] How many concurrent request should be made. [default: 1000]
-m Monochrome mode - won't colourize the output [default: false]
-p [number / string] Inclusive port range to scan, accepts either a range: -300, 101-200, or a single port 80, conflicts with -a [default: -1000]
-r [number] Retry attempts per port. [default: 1]
-t [number] Timeout for each request in milliseconds. [default: 2000]
-6 Scan the IPv6 address instead of IPv4, [default: false]


# Scan github.com using the default settings
havn github.com

# Scan default address [], all ports [1-65535],
# 2048 concurrent requests, 500ms timeout, 0 retries, IPv4
havn -a -c 2048 -t 500 -r 0

# Scan www.google.com, ports 10-600,
# 500 concurrent requests, 3000ms timeout, default retries [1], IPv4
havn www.google.com -p 10-600 -c 500 -t 3000 

# Scan www.digitalocean.com, ports 1-100
# default concurrent requests[1000], 1000ms timeout, and use IPv6 address
havn www.digitalocean.com -p -100 -t 1000 -6

# Scan www.bbc.com, port 443 only
# default concurrent requests[1000], default timeout[2000ms], 6 retries, IPv4
havn www.bbc.com -p 443 -r 6


  • Scan UDP ports, currently only TCP
  • allow multiple addresses/IPs to be scanned
  • monitor response times to automatically modify request settings
  • configurable option to disable second-pass scan
  • debug option to display more verbose output
  • improve windows performance
  • publish to npm


A number of tests will open port 80, this may cause issues if the port is already open on your system

cargo test -- --test-threads=1

Build step


cargo build --release

Cross platform

Using Docker

requires Docker & cross-rs

64bit arm (pi 4, pi zero w 2)

cross build --target aarch64-unknown-linux-musleabihf --release

32bit pi (pi zero w)

cross build --target arm-unknown-linux-musleabihf --release

Windows x86_64

cross build --target x86_64-pc-windows-gnu --release

Without Docker

64bit arm (pi 4, pi zero w 2)

edit ~/.cargo/config

linker = "rust-lld"
rustup target add aarch64-unknown-linux-musl
cargo build --target aarch64-unknown-linux-musl --release

32bit pi (pi zero w)

edit ~/.cargo/config

linker = "arm-linux-gnueabihf-ld"
sudo apt update && sudo apt install gcc-arm-linux-gnueabihf -y
rustup target add arm-unknown-linux-musleabihf
cargo build --target arm-unknown-linux-musleabihf --release

Windows (build on linux)

edit ~/.cargo/config

linker = "x86_64-w64-mingw32-gcc"
ar = "x86_64-w64-mingw32-gcc-ar"
sudo apt update && sudo apt install mingw-w64
rustup target add x86_64-pc-windows-gnu
cargo build --target x86_64-pc-windows-gnu --release

Untested on other platforms


~150K SLoC