It’s really common in cellular connections as well as smaller regional ISPs. I work for a rural fiber co-op with about 50,000 members/customers and we do CGNAT for all our members by default because we only have about 36,000 IPs allocated to us. We also have full ipv6 support as well with every customer getting a /56.
To get a big enough block for all our enterprise/business/residential customers to do 1:1 NAT for ipv4 would probably require an entire /16 which costs somewhere in the neighborhood of 2 million dollars last I checked. And even then we would eventually run out because we are constantly expanding to cover rural areas that have been ignored for decades by the big ISPs. Right now if a member needs a static or routable we just charge 10$ a month, and we have enough in reserve for all our members to operating like this likely until the entire internet abandons ipv4.
It’s really common in cellular connections as well as smaller regional ISPs. I work for a rural fiber co-op with about 50,000 members/customers and we do CGNAT for all our members by default because we only have about 36,000 IPs allocated to us. We also have full ipv6 support as well with every customer getting a /56.
To get a big enough block for all our enterprise/business/residential customers to do 1:1 NAT for ipv4 would probably require an entire /16 which costs somewhere in the neighborhood of 2 million dollars last I checked. And even then we would eventually run out because we are constantly expanding to cover rural areas that have been ignored for decades by the big ISPs. Right now if a member needs a static or routable we just charge 10$ a month, and we have enough in reserve for all our members to operating like this likely until the entire internet abandons ipv4.