If you’ve ever looked at your WiFi settings and wondered why there are two networks listed (one ending in “2.4G” and another in “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 Two Bands Explained
2.4 GHz
The older of the two 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 5 GHz, 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.
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 |
| Video conferencing, NAS access | Best on 5 GHz |
| High-density office environments | 5 GHz preferred |
Why This Matters for Your Office
In most office environments, you want to steer capable devices toward 5 GHz 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 both 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’s Coming: 6 GHz
The WiFi industry is actively working on opening up the 6 GHz band for unlicensed WiFi use. Regulatory proceedings are underway in the United States and Canada, with the promise of a large block of clean, uncongested spectrum that would significantly reduce the interference problems that plague 2.4 GHz today.
Hardware and standards aren’t there yet, but 6 GHz is worth watching. When it arrives, it will be particularly valuable in dense urban environments and multi-tenant office buildings where competing networks are a constant source of interference. We’ll cover it in detail once the standards and hardware mature.
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.