AT&T Speed Test
This page helps AT&T Fiber users check their internet connection speed. AT&T Fiber delivers symmetrical upload and download speeds, which is a major advantage over traditional cable internet.
Whether you have the Fiber 300, 500, 1 Gig, or the hyper-fast 2 Gig / 5 Gig plans, this test will confirm if your BGW320 Gateway is delivering the promised bandwidth.
How to interpret your AT&T speed test
AT&T Fiber results usually show consistent performance due to the direct fiber connection to your home (FTTH).
Symmetrical Speeds: Make sure your Upload Result matches your Download Result. If you have 300 Mbps download but only 50 Mbps upload, something is wrong with your gateway or you are using an old device.
Ping/Latency: Fiber latency is extremely low (typically under 10ms). This is perfect for competitive gaming and real-time video conferencing.
AT&T Gateway Details
Hardware Models
Arris BGW320: The newest white tower gateway with a built-in ONT (fiber plugs directly into the back). Supports Wi-Fi 6 for faster wireless speeds.
Arris BGW210: The older black rectangular gateway. Requires a separate white ONT box on the wall (connected via Ethernet). Supports Wi-Fi 5 (AC).
Typical real-world performance
Wired (Ethernet): Expect ~940 Mbps on a 1 Gig plan (due to TCP/IP overhead). 2/5 Gig plans require special 2.5GbE or 10GbE network cards.
Wi-Fi: On the BGW320, Wi-Fi 6 devices can reach 600-800 Mbps near the router. Older Wi-Fi 5 devices often cap at 300-500 Mbps.
Common Causes of Slow AT&T Speeds
If your fiber connection is lagging, consider these factors:
Active Armor: AT&T's security feature runs on the gateway and scans traffic. It can occasionally throttle high-bandwidth activities. Try temporarily disabling it in the Smart Home Manager app.
IP Passthrough Issues: If you use your own router (like Eero, Orbi, or Ubiquiti), ensure the BGW320/BGW210 is in "IP Passthrough" mode to avoid Double NAT, which creates lag.
AT&T Gateway Login – Default IP & Access Code
To enable IP Passthrough, change Wi-Fi channels, or view line stats, you must log in to the gateway interface.
| AT&T Gateway Login Details | Information |
| Login IP Address | 192.168.1.254 |
| Device Access Code | See Gateway Sticker (Unique code printed on the side/back of the device) |
| Default Username | (often blank) or attadmin |
| Management App | AT&T Smart Home Manager (iOS/Android) |
Steps to Login
- Connect to your AT&T Wi-Fi or Ethernet.
- Open your browser and type 192.168.1.254 in the address bar.
- Navigate to the "Home Network" or "Firewall" tab.
- When prompted, enter the Device Access Code found on the sticker.
Troubleshooting Gateway Lights
Solid White (BGW320): Service is active and working normally.
Solid Green (BGW210): Power and Broadband lights should be Solid Green.
Blinking Red (Service/Broadband): Signal loss. Check if your fiber cable is loose or bent sharply. Could be a neighborhood outage.
Solid Red: Hardware failure or critical error. Try holding the red reset button for 10 seconds.
Wired vs Wi-Fi Testing
To verify the true speed of your fiber line, connect a computer via Cat6 Ethernet cable to one of the Yellow LAN ports on the gateway.
If the wired speed test is fast (near gigabit) but Wi-Fi is slow, the issue is wireless interference or device limitations, not the AT&T fiber line itself.
When to contact AT&T support
Call 800.288.2020 if:
- Your Service light is Blinking Red for over 15 minutes.
- You have physically damaged the fiber cable (do not look into the end of the fiber).
- Your wired speed test results are consistently <50% of your plan speed.
AT&T Speed Test FAQs
What does a blinking red Service light mean? A blinking red 'Service' (BGW320) or 'Broadband' (BGW210) light indicates the gateway cannot detect a signal. Check connections and restart the device.
How do I log into my AT&T gateway? Go to 192.168.1.254. You will need the 'Device Access Code' from the sticker on the gateway.
Why is my upload speed low? AT&T Fiber should be symmetrical. If upload is low, check for faulty Ethernet cables or try restarting your gateway to clear the NAT table.
What is IP Passthrough? It is a special mode that bridges the public IP address to your personal router, bypassing most of the AT&T gateway's firewall functions. Essential for using third-party mesh systems.
Compare with Alternative Providers
Check speeds from other providers available in AT&T areas:
- Spectrum Speed Test: Major cable competitor.
- Xfinity Speed Test: Major cable alternative.
- Google Fiber Speed Test: Available in select cities like Austin and Atlanta.