Is there a citation for the "most" here? I understand this is true in some cases, but I've never used an ISP that does carrier grade NAT. I'm on Spectrum cable

Is there a citation for the "most" here? I understand this is true in some cases, but I've never used an ISP that does carrier grade NAT. I'm on Spectrum cable now, which is not exactly known for being a good ISP, and I have my own address.