All ISPs / Xfinity (Comcast)
Does Xfinity (Comcast) use CGNAT?
Short answer: No. Xfinity (Comcast) gives home customers a public IPv4 address, according to customer reports (we found no official Xfinity (Comcast) statement). Static IP: Business only. IPv6 is available, so devices can still be reachable over IPv6.
Can I self-host on Xfinity (Comcast)?
| CGNAT by default? | No Confidence: Low: customer reports only; no official ISP statement found. Community reports: residential wireline gets a public (dynamic) IPv4 via DHCP. No official statement found. Searched for an official Xfinity statement on CGNAT; none found.
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| Free opt-out? | N/A No CGNAT reported, so nothing to opt out of. |
| Static IP | Business only Xfinity staff on the official forum: residential accounts can't get a static IP; Xfinity Business required.
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| Static IP price | Unknown Not yet verified. Know the answer? Submit a report. |
| IPv6 | Yes Residential IPv6 is assigned dynamically; fixed prefixes are business-only (forum answers).
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| Typical upload | Cable: typically 23–306 Mbps (41 Mbps is the most common label value). Fiber: 100–9,600 Mbps. From Xfinity's machine-readable FCC broadband-label file (~87k plan/area rows, published 2026-02-03). Areas upgraded to 'enhanced' upstream list 117–306 Mbps on cable; some 2 Gig rows list ~2,173 Mbps. Labels are per address, so yours may differ.
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| Terms on running servers | Restricteduse or run dedicated, stand-alone equipment or servers from the Premises that provide network content or any other services to anyone outside of your Premises local area network (“Premises LAN”), also commonly referred to as public services or servers. Examples of prohibited equipment and servers include, but are not limited to, email, web hosting, file sharing, and proxy services and servers;
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Source types: official the ISP's own page · official-forum ISP staff on the ISP's forum · community customer reports · secondary a third party quoting the ISP. "Unknown" means we haven't verified it, not that the answer is no.
Is something wrong or missing? Submit a report Check whether you're behind CGNAT