If you’ve ever looked at your WiFi settings and wondered why there are two or three networks listed (ending in “2.4G” or “5G”) you’re not alone. These refer to the radio frequency bands your router uses to transmit wireless signals, and understanding the difference helps you get more out of your network.
The Three Bands Explained
2.4 GHz
The oldest of the three bands and by far the most crowded. It has been the standard for WiFi since the late 1990s, which means virtually every wireless device supports it, including older laptops, IoT gadgets, smart home devices, and budget hardware.
The trade-off: 2.4 GHz travels further and penetrates walls better than higher frequencies, but it offers lower maximum speeds and shares space with microwave ovens, baby monitors, Bluetooth devices, and your neighbours’ networks. In a dense urban or office environment, 2.4 GHz congestion is a real and common problem.
5 GHz
A significantly faster band with much less congestion. It supports higher speeds and has more available channels, which means less interference from neighbouring networks.
The trade-off: 5 GHz doesn’t travel as far as 2.4 GHz and is more affected by walls and obstacles. It’s ideal for devices that are reasonably close to an access point and need reliable, high-speed connections, laptops, desktop computers, streaming devices, and video conferencing equipment.
6 GHz (WiFi 6E and WiFi 7)
The newest band, introduced with WiFi 6E and carried forward into WiFi 7. It opens up a large swathe of previously unused spectrum, which means significantly less congestion and the potential for very high speeds in ideal conditions.
The trade-off: 6 GHz has even shorter range than 5 GHz and requires newer hardware, both the access point and the client device need to support WiFi 6E or WiFi 7 to use it. Most devices in the field today don’t support 6 GHz yet, but adoption is growing quickly.
Which Devices Use Which Band?
| Device Type | Typical Band |
|---|---|
| Smart home sensors, old IoT devices | 2.4 GHz only |
| Older laptops and phones | 2.4 GHz only |
| Modern laptops and phones | 2.4 GHz and 5 GHz |
| WiFi 6E / WiFi 7 devices | 2.4, 5 and 6 GHz |
| Video conferencing, NAS access | Best on 5 GHz |
| High-density office environments | 5 GHz and 6 GHz |
Why This Matters for Your Office
In most office environments, you want to steer capable devices toward 5 GHz (or 6 GHz if available) and leave 2.4 GHz for devices that have no other option.
Here’s why: if your modern laptops are connecting on 2.4 GHz, either because that’s the default or because the 5 GHz signal is weaker in their area, they’re getting slower speeds and competing with every other device on that congested band.
Most modern routers and access points support band steering, which automatically nudges capable devices toward the faster band. This works well in most cases, though it’s not perfect.
Should You Broadcast Separate SSIDs for Each Band?
This depends on your setup and devices.
Single SSID (band steering): One network name for all bands. The router or access point decides which band to assign each device. Simpler to manage, and works well with modern hardware.
Separate SSIDs: You give each band its own name (e.g. “Office_5G” and “Office_2.4G”). Gives you manual control over which devices connect where. Useful if you have IoT or smart home devices that must connect to 2.4 GHz or struggle with band steering.
In a business environment with mixed hardware, separate SSIDs often give you more predictable results — especially for IoT and smart devices that sometimes fail to connect when band steering is aggressive.
What About WiFi 6E and the 6 GHz Band?
WiFi 6E routers and access points have been available since around 2021, and WiFi 7 hardware began appearing in 2023–2024. If you’re buying new networking hardware today, look for WiFi 6E or WiFi 7 support.
The 6 GHz band is largely free of legacy interference, which makes it valuable in high-density environments like open-plan offices, conference rooms with many simultaneous users, or multi-tenant buildings with many competing networks.
For most SMEs refreshing their hardware in 2025–2026, WiFi 6E access points offer a meaningful improvement in performance, particularly in congested environments.
Practical Tips for Managing WiFi Bands
- Put IoT devices on 2.4 GHz and ideally on a separate guest or IoT SSID to isolate them from your main network.
- Use 5 GHz for laptops and workstations wherever possible.
- Check your channel settings on 2.4 GHz, channels 1, 6 and 11 are the only non-overlapping options. On 5 GHz there are many more.
- Consider a spectrum analyser if you’re experiencing interference you can’t diagnose. (Covered in a separate post in this series.)
- Don’t rely on “Auto” channel selection alone in a dense environment manually setting channels based on what’s in use around you often produces better results.