Testing your AT&T Fiber connection
AT&T Fiber is a fibre-to-the-home service with symmetrical speeds: upload equals download on every tier. Since June 7, 2026, AT&T sells four fibre tiers. Outside its fibre footprint, AT&T offers Internet Air, a 5G fixed wireless service with much lower speeds.
This test detects your provider automatically and measures download, upload, ping, jitter and latency under load against the nearest server on Cloudflare's network. Enter your plan speed under the result to see the percentage you really get.
AT&T Fiber speeds by plan
| Plan | Download | Upload |
|---|---|---|
| Internet 300 | 300 Mbps | 300 Mbps |
| Internet 500 | 500 Mbps | 500 Mbps |
| Internet 1000 (1 GIG) | 1,000 Mbps | 1,000 Mbps |
| Internet 5000 (5 GIG) | up to 5,000 Mbps | up to 5,000 Mbps |
AT&T states that speeds are based on a wired connection and that, on 5 GIG, a single wired device reaches at most about 4.7 Gbps. Older tiers such as 2 GIG may remain on existing accounts. Checked on 31 October 2026; tiers change and vary by address, so confirm on the AT&T Fiber website.
What result should you expect?
On fibre, a wired test should show 90 to 95% of your plan in both directions: about 940 Mbps down and up on 1 GIG with a gigabit port. To measure 5 GIG you need a computer with a 10 Gbps port and a Cat 6a cable. Over Wi-Fi, expect much less, even with the included Wi-Fi 7 equipment on top tiers.
Measure your connection now. Start the test
Common reasons for slow AT&T Fiber speeds
- Testing over Wi-Fi only: fibre is rarely the bottleneck; Wi-Fi almost always is. Read fibre slow on Wi-Fi, fast on Ethernet.
- Gigabit port on a multi-gig plan: a 1 Gbps port caps a 5 GIG line at about 940 Mbps. See Ethernet cable categories.
- Upload much lower than download: on AT&T Fiber that is not normal. Test over a cable; if it persists, contact support.
- Internet Air, not fibre: if your service is AT&T Internet Air, compare with 5G home internet expectations instead.
Before contacting AT&T support
- Restart the gateway and check its broadband light.
- Run wired tests in both directions and note the upload.
- Use the Smart Home Manager app to check connected devices and Wi-Fi.
- If speeds stay below your plan, check for traffic throttling, then contact support with your saved results.
More help: slow internet: causes and fixes and all providers we cover.
Sources
- FCC: broadband labels (typical speed and latency)
- AT&T Fiber: official website
- Light Reading: AT&T streamlines its fibre plans (June 2026)
SpeedFibre is an independent website, not affiliated with AT&T Fiber. The provider's name is used only to describe the service being tested.
Frequently asked questions
Is AT&T Fiber really symmetrical?
Yes. AT&T advertises equal upload and download speeds on all its fibre tiers. A large gap between the two on a wired test is worth reporting.
Why can't I reach 5 Gbps on AT&T 5 GIG?
AT&T itself states that a single wired device reaches about 4.7 Gbps. You also need a 10 Gbps network card, a suitable cable and a fast enough computer.
Is AT&T Internet Air the same as AT&T Fiber?
No. Internet Air uses the 5G network and is offered where fibre is not available. Its speeds and latency vary much more.
