Email and home address visible from check my ip site

[#1]

Hi All

I know these “check my ip” sites provide detail of ISP, region, device, browser, ios blah blah. However, a friend tried it with their device (Plusnet is the isp) and saw their email address when they drilled down the isp no.

That can’t be right, can it? Why would Plusnet operate any differently to other isps?

Thanks

[#2]

However, a friend tried it with their device (Plusnet is the isp) and saw their email address when they drilled down the isp no.

If they have a static IP , then the reverse DNS for their public IP will show <accountname>.plus.com

[#3]

So if they have dynamic (like most), the reverse DNS won’t show?

Second question- even if it was static, would that reverse dnd only be visible to him? Ie no one else? Ie somehow available through posting on social media, forums etc.

Many thanks again

Many thanks?

[#4]

So if they have dynamic (like most), the reverse DNS won’t show?

The reverse DNS for a dynamic IP shows as <ipaddress>.dyn.plus.net

Second question- even if it was static, would that reverse dnd only be visible to him? Ie no one else? Ie somehow available 

The reverse DNS is available to anyone who knows (or can detect) the public IP address.

If it is due to a static IP rDNS then its possible for your friend to get a it changed to <ip address>.plus.com

[#5]

Thanks. V clear and constructive. I won’t be able to see him for a few days? I think he must have static ip assigned, as was adamant his email was showing on one of the check my ip results page. I guess he must have highlighted the ip to generate it?

Moving forward, wouldn’t it be easier just to change device settings to automatic?

Thanks for your time and expertise.

[#6]

Apologies-meant to ask about changing static ip:

Will he need to approach Plusnet to do that?
If he changes it as suggested, will that prevent the email showing via reverse dns etc?

Regards

[#7]

He will need to ask Plusnet to change the rDNS

[#8]

Moderators Note

This topic has been moved from Broadband to Everything Else