Web Safe works via Virgin Media's DNS and to confirm if that is the case go to https://22.214.171.124/help and confirm the reported AS Name is Virgin Media.
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By default you will use VM DNS but this can be override by the device either by VPN, proxy change of DNS or a browser with DNS over TLS
If you wish to really limit DNS use modem mode with a router and a swtich VLAN two ports untag between hub and router and with the switch having ACL you can limit to VM DNS or you can get a high end router and do it that way.
IP's to block DNS over TLS in windows firewall
Thanks for your posts and replies, rafiaamiri.
Sorry to see you're still facing an issue with your blocked sites on web-safe not working, could you please advise if the Child Safe is switched on too as the blocked list is under this feature?
Also, have you checked further settings such as filtering to ensure it's all set to the right options for you in order for the pages to be blocked by Child Safe?
You can customise your Child Safe settings for your family by clicking on the Categories, Sites or Timer filters and selecting the level of protection.
Let us know more and we're happy to help you.
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Let me try this option and is this officially recommended by Virgin
No, not as far as I know but this should not detract from it being a valid troubleshooting process to determine if the device is using Virgin Media DNS or not. If you are concerned by the URL see Cloudflare | Wikipedia for more information about who operates 126.96.36.199 - Wikipedia
Why is that it is allowed in laptop browser but not in mobile which still I am weird any reasons to explain please
If one device is using Virgin Media DNS and the other is not you would see the described behaviour.
both laptop and mobile is using the same WiFi
As explain earlier if they are using different DNS setting then this would be seen. Quickest means to confirm this is to follow the previous advice here Re: Can access blocked website - Virgin Media Community - 5197227