Which US ISPs don't use CGNAT?
These home internet providers give customers a public IPv4 address by default, based on the sources on each ISP page. A public IP doesn't guarantee the terms allow servers, so check the server rules too.
| ISP | CGNAT | Opt-out | IPv6 | Server rules |
|---|---|---|---|---|
| Xfinity (Comcast) | No reports | N/A | Yes | Restricted |
| AT&T Fiber | No reports | N/A | Yes | No explicit ban |
| Verizon Fios | No reports | N/A | Yes | Restricted |
| Optimum (Altice) | No reports | N/A | Unknown | Limited |
| Quantum Fiber / CenturyLink | No reports | N/A | Partial | Unknown |
| Google Fiber (GFiber) | No official | N/A | Yes | Allowed (personal use) |
| Ziply Fiber | No reports | N/A | Unknown | Restricted |
| Brightspeed | No reports | N/A | Yes | Allowed (personal use) |
| Kinetic (Windstream) | No reports | N/A | Unknown | Restricted |
| Sonic | No official | N/A | Yes (fiber, not LA yet) | Unknown |
| altafiber (Cincinnati Bell / Fioptics) | No partly official | N/A | Yes | No explicit ban |
| US Internet (USI Fiber) | No partly official | N/A | No | Unknown |
12 of 41 ISPs we track. 14 still have an unverified CGNAT answer, so they aren't listed on either page. The confidence tag shows whether the answer comes from the ISP itself ("official"), partly from the ISP ("partly official") or only from customer reports ("reports"). What is CGNAT? · How to tell if you're behind it