Swisscom as a older RSP probably is sitting on a huge block of IPv4 addresses, whereas newer RSPs usually have much smaller blocks. Hence older RSPs tend to con

Swisscom as a older RSP probably is sitting on a huge block of IPv4 addresses, whereas newer RSPs usually have much smaller blocks. Hence older RSPs tend to continue with IPv4 as they have enough addresses to do this, whereas newer ones are pretty much forced to migrated to CG-NAT/IPv6 to conserve their IPv4 space. I see this here in New Zealand too: Spark, which was previously the state owned Telecom New Zealand, has so many IPv4 addresses they have done nothing at all in regards to IPv6 because they have no economic incentive to do so. In contrast, many of the other RSPs here have much smaller IPv4 blocks so CG-NAT/IPv6 is becoming the norm now for the smaller/newer RSPs.