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Does T-Mobile Home Internet give you a public IP?

Short answer: No for residential Home Internet. T-Mobile's own support page says its gateways can't enable port forwarding and that it can't change a dynamic IP to static. Customers report CGNAT (shared IPv4). There is no official residential public-IP add-on.

Does it use CGNAT by default?

Yes, according to customer reports, and T-Mobile's docs match that outcome even though they don't use the word "CGNAT". On the Connect your devices support page, T-Mobile says:

• Gateways do not have the ability to enable or disable NAT or port forwarding
• NAT type can't be changed on the gateway
• Home Internet uses dynamic IP addressing and T-Mobile can't change it to static

Customer reports describe an IPv6-native network with shared IPv4 (CGNAT / 464XLAT), so inbound IPv4 never reaches your gateway. See the T-Mobile Home Internet ISP page for every cited source.

Official path to a public IPv4

None on residential Home Internet. T-Mobile's support page is explicit: it does not have the ability to change IP from dynamic to static on this product. We found no residential "public IP" or "CGNAT opt-out" SKU.

Business / fixed-wireless business products are a different product line. This guide is only about residential T-Mobile Home Internet.

What about IPv6?

Customers report the network is IPv6-native. CGNAT only blocks inbound IPv4. If the checker shows you a public IPv6 address, some services that speak IPv6 can still reach you, if your gateway's IPv6 firewall allows it. That doesn't replace a public IPv4 for everything.

How to confirm on your line

1. Follow how to tell if you're behind CGNAT: compare the gateway WAN IPv4 with the public IPv4 from the checker.
2. A WAN address in 100.64.0.0/10 is the shared CGNAT range (explainer). A mismatch between WAN and public IP also means you're behind another NAT.

More detail and sources: Does T-Mobile Home Internet use CGNAT?

This site sticks to ISP facts. It doesn't review or recommend third-party products or services. Policies change; check the linked T-Mobile page before you rely on it.