KillerScan Download
About

The story behind the scanner, and the field tech who built it.

The maker

"I walk onto a network I've never seen and the first question is always the same: what is actually on here? So I wrote the tool that answers it - in seconds, with no agent and no login."

I'm Steve the Killer - a field technician and systems administrator at a large MSP. A big part of the job is showing up to a site I don't know and having to understand it fast: which box is the router, where the DNS actually lives, what that one device hammering the network even is. The existing answers were heavy network suites that want an agent, a server, a license, or an account before they'll tell you a single MAC address.

I wanted something I could drop on any machine, double-click, and read in a few seconds. So I built it, and KillerScan is the result.

The app

KillerScan is a native Windows network scanner that ships as a single self-contained executable - no installer required, no agent to deploy, no account, no subscription. Hand someone the .exe and they can map a subnet.

It is built for a field tech's reality: it finds devices that ignore ping, identifies vendors from the full IEEE OUI registries, and works out what each device is from a weighted blend of hostname, ports, banners, mDNS and SSDP - all locally, with no telemetry and no ads. It even calls out randomized privacy MACs instead of guessing a maker that isn't real.

Much of what it does was driven by the devices it ran into in the wild. The GitHub issues page stays open to anyone, and your suggestions genuinely shape where it goes next. KillerScan is free software under the GPL-3.0 licence. For the deep technical details, see the Technical page.