Home / Guides / Public IP guides / T-Mobile Fiber

Does T-Mobile Fiber (Lumos) give you a public IP?

Short answer: Residential lines often start on CGNAT. T-Mobile Fiber / Lumos does not publish a clear consumer CGNAT page we could find. Customers report that asking support for a public or "static" IPv4 works; some were charged about $10/month, others got a public dynamic IP at no charge. Treat price and process as market-specific until an official page confirms them.

Does it use CGNAT by default?

Yes according to multiple 2025–2026 customer write-ups for new T-Mobile Fiber (Lumos) installs: the WAN came with a shared / CGNAT address and inbound connections failed until support reprovisioned the line. We found no official Lumos or T-Mobile Fiber page that states "we use CGNAT." Confidence is low (reports only). See the T-Mobile Fiber ISP page.

Official path to a public IPv4

No published residential SKU found. What customers report:

Call or chat support and ask for a public IPv4 or static IP. Several report success the same day.
One May 2026 write-up says tier-2 support charged $10/month for a "static" public IP (customer report).
Other customers say support moved them off CGNAT to a public dynamic IP without a monthly add-on (customer report, customer report).

Until T-Mobile Fiber publishes the option and price, call support and get the fee (if any) in writing on your account. This guide does not invent an official price.

What about IPv6?

Customer reports from Lumos markets say residential IPv6 wasn't available yet (tier-2 confirmed in at least one Aug 2026 review). That may change by market. Verify with the checker on your line.

How to confirm on your line

Use how to tell if you're behind CGNAT.
Look for a WAN address in 100.64.0.0/10 (explainer) or a WAN/public mismatch.

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

This site sticks to ISP facts. It doesn't review or recommend third-party products or services. Policies change; ask T-Mobile Fiber support for the current option on your account.