We provide a list of webpages containing child sexual abuse images and videos to companies that choose to block or filter this material to protect their users and to prevent the repeated victimisation of the children depicted. Our analysts check these URLs daily to see if the sites are still online and those that are no longer online will be removed from the URL list that same day. The list is updated twice daily, with URLs added and removed as content is identified or taken down.

During 2025:

A total of 260,699, unique URLs were included on the list.
On average, 1,212 URLs were added each day up from 1,129 per day in 2024 (an increase of 7%).
The list contained an average of 6,923 URLs on any given day.

Criminal URLs on the list will depict a whole range of children, all ages, sexes and varying categories of severity of sexual abuse. The URL list is dynamic, with entries added and removed daily.

Our remit is to issue notice and takedown requests (also known as takedown notices) for websites hosted in the UK only. When content is hosted outside the UK, we notify the relevant international hotlines and law enforcement agencies to enable action to be taken locally. With agreement, our Hotline also supports the removal of international child sexual abuse material by following up on IWF notifications and contacting the hosting provider directly. This is an additional service we provide to limit the global availability of child sexual abuse imagery.

We conduct daily checks of the IWF URL List. If content is not removed within an appropriate timeframe, the IWF may issue removal notices directly to the relevant hosting provider in the country where the content is hosted. Once the criminal content has been taken down, the associated URLs are removed from the list to ensure it remains as accurate and up to date as possible.