What is Wi-Fi Frequency Bands and Channels

1. The 3 Main Bands Overviews

Band (GHz)	Frequency Range(GHz)	Typical Channel Count (20 MHz)	Key Characteristics
2.4	2.400–2.4835	13 (most regions) / 14 (Japan only)	Good penetration, long range; crowded and noisy; only 3 non-overlapping channels
5.8	5.150–5.925	~25 (region-dependent)	Clean, many channels, high throughput; poor wall penetration; some channels require DFS
6	5.925–7.125	59 (20 MHz) / 29 (40MHz) / 14 (80 MHz) / 7 (160 MHz)/ 3 (320 MHz	Cleanest, widest channels; Wi-Fi 6E/7 only; poor penetration; regulatory rollout varies by country

2. The 2.4 GHz Band

2.1 Channel Layout

• Channel spacing: 5 MHz (except channel 14)
• Channel width: 20 MHz standard (older 802.11b devices may use 22 MHz)
• Channel count: 1–13 (most of the world); channel 14 is allowed only in Japan (2.484 GHz, 802.11b only)

2.2 The Critical Problem: Non-Overlapping Channels

Each 20 MHz channel in fact occupies roughly 22 MHz of spectrum, so only channels spaced 5 apart avoid overlapping.

There are only 3 fully non-overlapping 20 MHz channels on 2.4 GHz:

• 1, 6, 11 (the standard recommendation in North America and China)
• Some European deployments use 1, 5, 9, 13 (4-channel scheme; edges overlap slightly but remain usable)

If you and your neighbours are all crammed onto channel 6, 2.4 GHz throughput will drop dramatically — this is the fundamental reason 2.4 GHz often feels sluggish in dense environments.

2.3 Practical Recommendations

• Use 5 GHz instead of 2.4 GHz whenever possible
• If you must use 2.4 GHz, stick to 20 MHz channel width (never open 40 MHz — it overlaps with neighbouring channels entirely)
• Pick one of 1, 6, 11 — whichever your neighbours are not using

3. The 5.8 GHz Band

 5GHz is divided into several sub-bands with different regulatory requirements.

3.1 U-NII Sub-bands and Layout

Sub-band	Frequency Range	Channel Range	DFS?	Characteristics	China Zone
U-NII-1	5.150–5.250 GHz	36, 40, 44, 48	❌	Indoor-only (US); no DFS; clean	✅ available
U-NII-2	5.250–5.350 GHz	52, 56, 60, 64	✅	DFS + TPC required	✅ available
U-NII-2e	5.470–5.725 GHz	100–144	✅	The band with the most DFS channels	❌ not opened
U-NII-3	5.725–5.850 GHz	149–165	❌	No DFS; the most stable high-speed band	✅ available
U-NII-4	5.850–5.925 GHz	169–181	❌	Newer allocation; partial device support	❌ not opened

• Routers sold in China therefore typically expose only the 36–64 and 149–165 groups; the 100–144 range in between is hidden by regulation, not by hardware limitation.

3.2 DFS (Dynamic Frequency Selection)

DFS channels share spectrum with weather and military radar. An AP must listen for 60 seconds (or longer) before using such a channel, and must vacate immediately if radar is detected during operation (Channel Availability Check + In-Service Monitoring).

Practical impact of DFS:

• APs introduce a 30–60 second scan delay at startup before the 5 GHz network becomes available
• Near radar sources (airports, harbours), channel-hopping can be frequent
• Some older devices and low-end IoT gear do not support DFS and cannot join these channels

Non-DFS channels (always available): 36, 40, 44, 48, 149, 153, 157, 161, 165

4. The 6 GHz Band (Wi-Fi 6E / Wi-Fi 7)

4.1 Why 6 GHz Is Revolutionary

• 1200 MHz of continuous spectrum (5.925–7.125 GHz in the US) — wider than 2.4 GHz and 5 GHz combined
• No DFS requirement (no radar sharing today)
• Up to 7 non-overlapping 160 MHz channels (versus only 1–2 on 5 GHz, usually requiring DFS)
• Channel numbering starts at 1, with a step of 4 (1, 5, 9, 13 … 233)

4.2 Sub-band Breakdown and Layout (US FCC, U-NII-5 through U-NII-8)

Sub-band	Frequency Range	Channels	Notes
U-NII-5	5.925–6.425 GHz	1–93	First to open globally
U-NII-6	6.425–6.525 GHz	97–113
U-NII-7	6.525–6.875 GHz	117–185
U-NII-8	6.875–7.125 GHz	189–233

⚠️ Mainland China 6 GHz status (as of early 2026): 6 GHz has not yet been formally opened for Wi-Fi use. The band is currently allocated primarily to licensed mobile and satellite services. Some vendors shipping “Wi-Fi 7 routers” in China ship with 6 GHz disabled in firmware. When buying domestically, you should confirm whether 6 GHz is unlocked — it is common to find it missing on devices sold in China.

The EU has opened only 5.945–6.425 GHz (~500 MHz, the lower half of U-NII-5), so European Wi-Fi 6E devices have only about 24 twenty-MHz channels and 3 one-sixty-MHz channels — far fewer than in the US.

5. Practical recommendations:

• 2.4 GHz: lock to 20 MHz
• 5 GHz: 80 MHz is the sweet spot (balanced throughput and interference); 160 MHz only at short range in clean environments
• 6 GHz: start at 80 MHz, 160 MHz is the daily-workhorse, 320 MHz reserved for extreme scenarios

6. Band, Channel, Frequency Reference

WiFi	CH BW	Channel and Frequency
2.4 GHz	20MHz	Channel	1	2	3	4	5	6	7	8	9	10	11	12	13	14
		Frequency/MHz	2412	2417	2422	2427	2432	2437	2442	2447	2452	2457	2462	2467	2472	2484
	40MHz	Channel			3	4	5	6	7	8	9	10	11
		Frequency/MHz			2422	2427	2432	2437	2442	2447	2452	2457	2462
5 GHz Low	20MHz	Channel	36	40	44	48	52	56	60	64
		Frequency/MHz	5180	5200	5220	5240	5260	5280	5300	5320
	40MHz	Channel	38	42	46	50	54	58	62
		Frequency/MHz	5190	5210	5230	5250	5270	5290	5310
	80MHz	Channel		42				58
		Frequency/MHz		5210				5290
	160MHz	Channel				50
		Frequency/MHz				5250
5 GHz Mid	20MHz	Channel	100	104	108	112	116	120	124	128	132	136	140
		Frequency/MHz	5500	5520	5540	5560	5580	5600	5620	5640	5660	5680	5700
	40MHz	Channel	102	106	110	114	118	122	126	130	134	138
		Frequency/MHz	5510	5530	5550	5570	5590	5610	5630	5650	5670	5690
	80MHz	Channel		106				122
		Frequency/MHz		5530				5610
	160MHz	Channel				114
		Frequency/MHz				5570
5 GHz High	20MHz	Channel	149	153	157	161	165
		Frequency/MHz	5745	5765	5785	5805	5825
	40MHz	Channel	151	155	159	163
		Frequency/MHz	5755	5775	5795	5815
	80MHz	Channel		155
		Frequency/MHz		5775
6E U-NII-5: 5925-6425MHz U-NII-6: 6425-6525MHz U-NII-7: 6525-6875MHz U-NII-8: 6875-7125MHz	20MHz	Channel	1	5	9	13	17	21	25	29	33	37	41	45	49	53	57	61
		Frequency/MHz	5955	5975	5995	6015	6035	6055	6075	6095	6115	6135	6155	6175	6195	6215	6235	6255
	40MHz	Channel	3	11	19	27	35	43	51	59
		Frequency/MHz	5965	6005	6045	6085	6125	6165	6205	6245
	80MHz	Channel	7	23	39	55
		Frequency/MHz	5985	6065	6145	6225
	160MHz	Channel	15	47
		Frequency/MHz	6025	6185
	20MHz	Channel	65	69	73	77	81	85	89	93	97	101	105	109	113	117	121	125
		Frequency/MHz	6275	6295	6315	6335	6355	6375	6395	6415	6435	6455	6475	6495	6515	6535	6555	6575
	40MHz	Channel	67	75	83	91	99	107	115	123
		Frequency/MHz	6285	6325	6365	6405	6445	6485	6525	6565
	80MHz	Channel	71	87	103	119
		Frequency/MHz	6305	6385	6465	6545
	160MHz	Channel	79	111
		Frequency/MHz	6345	6505
	20MHz	Channel	129	133	137	141	145	149	153	157	161	165	169	173	177	181	185	189
		Frequency/MHz	6595	6615	6635	6655	6675	6695	6715	6735	6755	6775	6795	6815	6835	6855	6875	6895
	40MHz	Channel	131	139	147	155	163	171	179	187
		Frequency/MHz	6605	6645	6685	6725	6765	6805	6845	6885
	80MHz	Channel	135	151	167	183
		Frequency/MHz	6625	6705	6785	6865
	160MHz	Channel	143	175
		Frequency/MHz	6665	6825
	20MHz	Channel	193	197	201	205	209	213	217	221	225	229	233
		Frequency/MHz	6915	6935	6955	6975	6995	7015	7035	7055	7075	7095	7115
	40MHz	Channel	195	203	211	219	227
		Frequency/MHz	6925	6965	7005	7045	7085
	80MHz	Channel	199	215
		Frequency/MHz	6945	7025
	160MHz	Channel	207
		Frequency/MHz	6985
1、IEEE Std 802.11-2012：17.4.6.3 Channel Numbering of operating channels
2、https://support.huawei.com/enterprise/zh/doc/EDOC1100198080/
3、https://www.litepoint.com/blog/wi-fi-6e-standard-and-channels/
3、https://en.wikipedia.org/wiki/List_of_WLAN_channels