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Check a domain

For website owners

ScanDefendBot: who we are,and how to opt out.

Seen it in your logs? A ScanDefend customer asked us to check your website's public security signals.

ScanDefendBot/1.0 (+https://scandefend.com/bot)

Opt my domain out What a check covers Let ScanDefend in

In short

A polite, named scanner.Read-only by design.

It reads your public homepage and the files it links to, a few standard public files like robots.txt and security.txt, and your public DNS records.

  • Who we are

    ScanDefendBot is the website checker used by ScanDefend, run by IronSky Limited (Ireland).

  • It names itself

    Every request carries the User-Agent shown above.

  • Light and read-only

    A small number of polite requests to your public homepage and the files it links to, a few standard public files like robots.txt and security.txt, and your public DNS records.

  • Stays on the public surface

    Public pages only: no logins, forms or hidden files.

Where we send from

Fixed addresses.Easy to recognise.

ScanDefendBot's website requests come from these IPv4 addresses.

  • 18.203.64.25

Updated 2026-10-20. Machine-readable list · Let ScanDefend in

Opt out

Opt out a domain.Blocked from checkout straight away.

Opted-out domains are kept out of checkout, so no one can order a scan of them. The block starts as soon as you send the form, and a person reviews the request within 24 hours.

Questions about our scanner? Email abuse@scandefend.com with your domain and the rough time of the requests.

The website name only. Opting out a domain also covers its subdomains.

So we can confirm the opt-out. Never used for marketing.

Confirm you're a person

Or email abuse@scandefend.com with the subject "Opt out".

About the checks

Also useful: About ScanDefend Contact Let ScanDefend in