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HTTP/2 301 server: nginx date: Tue, 30 Dec 2025 23:35:50 GMT content-type: text/html content-length: 162 location: https://unix4lyfe.org/darkstat/ cache-control: must-revalidate HTTP/2 200 server: nginx date: Tue, 30 Dec 2025 23:35:50 GMT content-type: text/html last-modified: Tue, 11 Jan 2022 00:26:17 GMT vary: Accept-Encoding etag: W/"61dccea9-1711" cache-control: must-revalidate content-encoding: gzip darkstat

Captures network traffic, calculates statistics about usage, and serves reports over HTTP.

Features:

Traffic graphs, reports per host, shows ports for each host.
Embedded web-server with deflate compression.
Asynchronous reverse DNS resolution using a child process.
Small. Portable. Single-threaded. Efficient.
Supports IPv6.

Screenshots: (click)

Code:

Quickstart:

# ./configure
# make

Once built, this is all it takes to get darkstat running:

# darkstat -i eth0

Although it's possible to configure / complicate things further, once out of the box, darkstat will just work without much trouble on your part.

Slower start:

# man darkstat

Portability:

darkstat should build and run on any modern UNIX system that has libpcap. It has been reported to build on:

AIX
FreeBSD, NetBSD, OpenBSD
Linux (Archlinux, Debian, Fedora, Gentoo, OpenSUSE, Ubuntu)
Mac OS X
Solaris

Efficiency:

On my FreeBSD router, ppp takes an order of magnitude more CPU time than darkstat. If your system can keep up with PPPoE, you should have no trouble running darkstat.