I expect you were on Orange LLU before, and that is being phased out, with customers being moved to BT Wholesale connections (non-LLU).
That almost certainly accounts for the drop in speed.
Re IP addresses, they can be either Static
. If you are allocated a static address then it always stays the same. You would probably have been told it before you were connected, as you usually have to set it up in your router. This isn't always the case though.
If you are allocated a dynamic address one is given to you each time you connect the router. This is often different from the previous time, though with a few ISPs it is what we call "sticky" - in that it usually sticks to your line.
ISPs buy blocks of IP addresses from the relevant authorities. Static IP addresses mean the ISP has to have one for every customer all the time, dynamic means they only need enough plus some spare to provide for the maximum number they ever have connecting simultaneously.
It looks like yours is dynamic.
As an aside, I suggest you edit out the actual IP addresses. Hacker search engines crawl through this sort of place looking for them as potential targets.
My broadband basic info/help site - www.robertos.me.uk
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