Can I self-host on my ISP?

If your provider puts you behind CGNAT, port forwarding won't work, no matter what your router says. Here's what 41 US home ISPs actually do, with a source cited for every fact.

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Quick lists: ISPs that use CGNAT · ISPs without CGNAT · How to tell if you're behind CGNAT · ISPs by state

ISPTypeCGNAT by defaultStatic IPIPv6Server rulesVerified
Xfinity (Comcast)CableNo reportsBusiness onlyYesRestricted2026-10-16
Spectrum (Charter)CableSome plans/areas partly officialBusiness onlyYesNo explicit ban2026-10-16
AT&T FiberFiberNo reportsYes (paid block)YesNo explicit ban2026-10-16
AT&T Internet Air5G fixed wirelessYes partly officialUnknownUnknownUnknown2026-10-16
Verizon FiosFiberNo reportsBusiness onlyYesRestricted2026-10-16
Verizon 5G Home Internet5G fixed wirelessUnknownBusiness onlyUnknownUnknown2026-10-16
T-Mobile Home Internet5G fixed wirelessYes partly officialNoYesUnknown2026-10-16
StarlinkSatellite (LEO)Yes officialNoYesUnknown2026-10-16
CoxCableSome plans/areas reportsNo (residential)YesUnclear2026-10-16
Optimum (Altice)Cable / FiberNo reportsBusiness onlyUnknownLimited2026-10-16
Frontier Fiber (Verizon)Fiber / DSLSome plans/areas officialUnknownPartialRestricted2026-10-16
Quantum Fiber / CenturyLinkFiber / DSLNo reportsNo new leasesPartialUnknown2026-10-16
MediacomCableSome plans/areas officialBusiness onlyUnknownRestricted2026-10-16
Astound (RCN / Wave / Grande / enTouch)Cable / FiberUnknownUnknownYesLimited2026-10-16
Sparklight (Cable One)Cable / FiberUnknownBusiness onlyUnknownUnknown2026-10-16
WOW!Cable / FiberUnknownBusiness onlyUnknownUnknown2026-10-16
Google Fiber (GFiber)FiberNo officialBusiness onlyYesAllowed (personal use)2026-10-16
MetronetFiberYes reportsYes (residential add-on)NoRestricted2026-10-16
Ziply FiberFiberNo reportsOnly on 10 Gig / 50 Gig plans, or BusinessUnknownRestricted2026-10-16
BrightspeedFiber / DSLNo reportsYes (residential, postpaid)YesAllowed (personal use)2026-10-16
Kinetic (Windstream)Fiber / DSLNo reportsunclearUnknownRestricted2026-10-16
Fidium Fiber (Consolidated)FiberUnknownUnknownUnknownRestricted2026-10-16
TDS TelecomFiber / Cable / DSLUnknownUnknownUnknownRestricted2026-10-16
BreezelineCableUnknownUnknownUnknownRestricted2026-10-16
EPB FiberFiber (municipal)Some plans/areas reportsUnknownUnknownNo explicit ban2026-10-16
SonicFiber / DSLNo officialNo (fiber)Yes (fiber, not LA yet)Unknown2026-10-16
HughesnetSatellite (GEO)Yes reportsBusiness plans onlyUnknownUnknown2026-10-16
ViasatSatellite (GEO)UnknownBusiness onlyNoUnknown2026-10-16
ALLO FiberFiberUnknownUnknownUnknownRestricted2026-10-16
Rise Internet (formerly Rise Broadband)Fixed wirelessUnknownUnknownUnknownLimited2026-10-16
altafiber (Cincinnati Bell / Fioptics)FiberNo partly officialYes (residential add-on)YesNo explicit ban2026-10-16
Greenlight NetworksFiberYes reportsYes (on request)Yes (unsupported)Restricted2026-10-16
US Internet (USI Fiber)FiberNo partly officialBusiness only (officially)NoUnknown2026-10-16
GCICable / Fiber / Fixed wirelessSome plans/areas reportsUnknownUnknownLimited2026-10-16
T-Mobile Fiber (Lumos)FiberYes reportsUnknownNoUnknown2026-10-16
Nextlink InternetFixed wireless / FiberYes officialYes (paid add-on)UnknownUnknown2026-10-16
MidcoCable / Fiber / Fixed wirelessUnknownUnknownUnknownRestricted2026-10-16
Hawaiian TelcomFiber / DSLUnknownYes (residential option)UnknownRestricted2026-10-16
C Spire FiberFiberUnknownUnknownUnknownRestricted2026-10-16
Glo Fiber (Shentel)FiberUnknownUnknownUnknownNo explicit ban2026-10-16
Point BroadbandFiberUnknownUnknownUnknownUnknown2026-10-16

Sourced CGNAT answers for 26 of 41 ISPs so far (6 confirmed by the ISP itself, 5 partly, 15 from customer reports only). "Unknown" means not verified yet. Help fill the gaps.