Modern wireless networks are under enormous strain due to the sheer number of connected devices in apartment buildings and office buildings. The 5 GHz band has become a true salvation for users seeking stability and high data transfer speeds unavailable in the congested 2.4 GHz band. Understanding how frequencies are allocated and how many are available is the foundation for properly configuring a router.
Unlike its predecessor, the 5 GHz band offers significantly more flexibility. However, the number of available channels is not fixed for all devices and regions. It directly depends on the legal regulations of a particular country, the version of the WiFi standard, and the channel bandwidth used.
In this article, we'll take a detailed look at the frequency spectrum structure, explain the differences between channels with and without DFS, and help you choose the optimal settings for your equipment. You'll learn why automatic selection isn't always effective and how manual tuning can dramatically improve signal quality.
General structure of the range and number of channels
The 5 GHz band covers a wide range of frequencies that typically extends from 5150 MHz to 5825 MHz, although the exact boundaries can vary. Standard IEEE 802.11a/ac/ax divides this spectrum into separate sections called channels, each with a central frequency. In theory, using a minimum channel width of 20 MHz, one could count up to 25 non-overlapping channels in the full spectrum.
However, the reality for end users is different due to regional restrictions. Available channels vary in Russia, Europe, and the United States. For example, 33 channels are the most common in Russia, but not all of them are permitted to be used without restrictions. Some frequencies are reserved for weather radars and military use, which imposes restrictions on the operation of civilian equipment.
⚠️ Attention: Using frequencies prohibited in your region can result in fines from communications regulators and may interfere with critical services. Always check your router's country settings.It is important to understand that router It doesn't always see or use all theoretically available channels. The device's firmware and certification often limit the list of available options. Therefore, even if the physical spectrum allows for 33 channels, your device's interface may not show all available channels. TP-Link or Keenetic There may be fewer of them displayed.
Regional restrictions and standards
Geographic location plays a key role in determining the available number of channels. Globally, the world is divided into several regulatory zones: FCC (USA), ETSI (Europe/Russia), and others. The ETSI zone, which includes the Russian Federation, allows for the use of channels 36 through 64, as well as 100 through 144 and 149 through 165. This gives a total of 33 channels in 20 MHz increments.
The situation is different in the United States: 45 channels are available, but some (for example, 120-128) are prohibited due to the risk of interference with access terminals. This means that a device imported from the US may not function correctly in Russia or may show fewer channels unless the region is changed in the settings.
📊 In which country are you setting up the network?RussiaUSAEurope (not Russia)AsiaOtherWhen purchasing equipment, it is worth paying attention to the region markings. If you purchased routerIf you install a network aimed at the Chinese or US markets in Moscow, it may default to a channel we have reserved. At best, the network will simply not launch; at worst, it will cause interference.
Below is a table of channel distribution across the main ranges, relevant for most modern standards:
Frequency range Channel numbers Restrictions Typical use UNII-1 (Lower) 36, 40, 44, 48 Power limitation Home networks, low power UNII-2 (Medium) 52-64, 100-112 DFS (radar) required Dense development, offices UNII-2 Extended 116-128, 132-144 DFS (radar) required Corporate sector UNII-3 (Upper) 149-165 High power Long-distance links, streets Channel width: 20, 40, 80 and 160 MHz
The number of physical channels is only half the equation. The other half is the channel width, which determines how much data can be transmitted simultaneously. The standard 802.11ac (WiFi 5) popularized the 80 MHz width, and 802.11ax (WiFi 6) added support for 160 MHz. The wider the channel, the fewer channels there are in the available spectrum.
If you set the bandwidth to 160 MHz, the entire available 5 GHz band will collapse into just one, or at most two, non-overlapping channels. It's like building an eight-lane highway where there were previously four narrow roads: the throughput of a single "car" (data flow) is enormous, but the number of roads themselves becomes critically small, and they are easily blocked by neighboring roads.
With an 80 MHz bandwidth, you get about 5-6 non-overlapping channels. This is a more manageable scenario, but in dense urban areas, even these channels can be occupied. Narrow 20 MHz channels provide the maximum number of options (up to 33), better wall penetration, and interference resistance, but sacrifice maximum speed.
Modern routers can aggregate channels by combining adjacent frequencies. However, it's worth remembering that Real 5GHz WiFi speed is only achieved using 80MHz and higher bandwidths, but stability is often better at 40MHz.Balancing speed and the number of available channels is a key task for a network administrator.
The DFS Problem and Radar Channels
One of the main features of the 5 GHz band is the mechanism DFS (Dynamic Frequency Selection)Some channels (mainly mid-range, from 52 to 144) are reserved for weather radars and military systems. Routers operating on these frequencies are required to constantly "listen" for radar signals.
If a router detects a radar signal, it must immediately (within 10 seconds) stop broadcasting on that frequency and switch all clients to another channel. This process causes connection interruptions for several seconds or even minutes, which has a severe impact on online gaming and video calls.
⚠️ Attention: Near airports and military installations, the use of DFS channels may be completely blocked by the router firmware or lead to constant network reconnections.On the other hand, DFS channels can be a lifesaver in empty frequency bands. Since standard home routers often avoid these frequencies by default due to the complexity of the implementation, they can be extremely quiet. If you live in a private home away from strategic locations, choosing a channel in the DFS range (e.g., 100-120) can yield excellent results.
Professionals use specialized software to check for channel occupancy and the presence of radar signals. The average user only needs to know: if the network is constantly dropping, try forcibly switching the router to channels 36-48 or 149-165, which don't require radar scanning.
Practical router setup
Moving on to the practical part, let's look at how to apply this knowledge. The first step is to analyze your surroundings. You need to see which channels are already occupied by your neighbors. You don't have to be a hacker to do this; just install an app on your smartphone, for example, WiFi Analyzer or WiFi Man.
After scanning, you'll see a load chart. Your goal is to find a "hole" in the airwaves. If channels 36, 40, 44, and 48 are all occupied, but channel 100 is free, it makes sense to take a chance and use a DFS channel. If there are no free narrow channels, you can try expanding the bandwidth to 80 MHz, covering several busy but weak neighboring signals.
☑️ 5 GHz WiFi Setup Checklist
Completed: 0 / 5In the router interface, look for the section
WirelessorWireless network. Find the itemChannel Width(Channel width) andChannel(Channel). Avoid "Auto" mode if you have specific speed issues, as router algorithms often malfunction and may switch to a worse channel.After making changes, be sure to save the settings (
Save/Apply) and reboot the router. Client devices may also need to reconnect to the network to see the changes in the broadcast settings.Comparison with the 2.4 GHz band
Why are we discussing 5 GHz in such detail when we have good old 2.4 GHz? The answer lies in the number of channels. The 2.4 GHz band has only 13 channels (in Russia), but due to the wide signal spectrum, only three of them actually don't overlap: 1, 6, and 11. The rest interfere with each other.
The situation is radically different in the 5 GHz band. Even with a 40 MHz channel width, you have more than 10 non-overlapping options. This means the likelihood of you disturbing your neighbor, or them disturbing you, is significantly lower. Furthermore, 5 GHz is less susceptible to household interference from microwaves, Bluetooth headsets, and baby monitors.
Why is 5 GHz worse at passing through walls?
A higher signal frequency (5 GHz vs. 2.4 GHz) means a shorter wavelength. Shorter wavelengths are less able to bypass obstacles and attenuate faster in concrete and brick, so the range of 5 GHz is always shorter.
However, you shouldn't completely abandon 2.4 GHz. Smart home devices, older laptops, and budget devices often operate exclusively on this frequency. The ideal strategy is a dual-band router, with 5 GHz dedicated to demanding tasks (video, gaming), and 2.4 GHz for background devices and IoT.
Frequently Asked Questions (FAQ)
How many 5 GHz channels are available in Russia?
In the Russian Federation, 33 channels with 20 MHz spacing are available for civilian use. However, some of these (DFS channels) have restrictions for use near airports and military installations.
Which 5GHz channel is best for gaming?
For gaming, stability (low ping) is more important than just speed. Channels 36, 40, 44, or 48 are best, as they don't require DFS scanning and are less likely to be switched. Channel widths of 40 or 80 MHz are optimal.
Why doesn't the router see channels above 64?
This is due to regional settings. If your router is set to a restricted country (or the US, where some channels are blocked), the upper band may be hidden. Check your regional settings in the router interface.
Does channel width affect WiFi range?
Yes, indirectly. A wider channel (160 MHz) requires a higher signal strength (SNR) for decoding. At the edge of the coverage area, a device may not be able to handle the wide channel and may switch to a narrower one or even drop out, while a narrower 20 MHz channel will penetrate further.