[arielcostas]

The thing is, in many cases the provider selling internet to you isn't the same as whoever owns the cables that arrive to your place. So you may switch between providers (which in Spain are owned by 4 groups: MasOrange, Movistar/Telefónica, Vodafone and DIGI) but in many cases your IP goes through Telefónica's network (either by hiring them, or via NEBA, basically renting their infra) or MasOrange (they acquired a lot of local companies like R in Galicia, Euskaltel in the Basque Country, Telecable, and many others, including Orange) and basically own 14 brands as of now [^1].

So even if you do switch providers, chances are you are using one of the same (if not the actual same) provider, and got perhaps other options in those 4 groups. There's an actual coverage map by our Ministry for Digital Transformation[^2] that shows what actual coverage there is. Sometimes there's "Aire Networks" or others, but mostly it's the four large groups I mentioned before.

[^1]: https://masorange.es/en/brands/ [^2]: https://experience.arcgis.com/experience/275e90e49dc544ef94e...

[cassianoleal]

At least in the UK, if you use a BT line as GP mentioned (via OpenReach), they provide the physical connection but anything on top of that is up to the ISP.

In OSI terms, OpenReach does layers 1 and 2, and the ISP is responsible for 3. That means your IP addresses, your IPv6 PD, etc are all on the ISP. If you change ISPs, it’s a whole new IP infra even if it uses the same OpenReach cables.