cfg80211_get_unii(9)

✨ cfg80211_get_unii — kernel API manual energy ✨

okay so bestie, this one lives in the Kernel API Manual, section 9, and it's literally the glow-up guide for figuring out which U-NII band a frequency belongs to. no cap, it's giving "regulatory vibes only" 💅

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🌸 NAME 🌸

cfg80211_get_unii — get the U-NII band for the frequency 🎀

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🦋 SYNOPSIS 🦋

int cfg80211_get_unii (int freq );

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💜 ARGUMENTS 💜

• freq — the frequency for which we want to get the UNII band. that's it, that's the whole input, she's lowkey simple like that 🫶

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✨ DESCRIPTION ✨

Get a value specifying the U-NII band frequency belongs to. U-NII bands are defined by the FCC in C.F.R 47 part 15. 📜

like, the FCC said what the bands are, and this function is just the messenger, periodt. iykyk 👑

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🔥 RETURN 🔥

• -EINVAL if freq is invalid 😭 (bestie, invalid frequency = no band for you)
• 0 for UNII-1
• 1 for UNII-2A
• 2 for UNII-2B
• 3 for UNII-2C
• 4 for UNII-3

so like, a cute little numbered menu of bands, no guessing required 🌈

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🌟 SEE ALSO 🌟

Kernel file ./net/wireless/reg.h — go read her, she ate 💅

• regulatory_hint_indoor(9)
• regulatory_netlink_notify(9)
• regulatory_hint_found_beacon(9)
• regulatory_hint_country_ie(9)
• regulatory_hint_disconnect(9)
• regulatory_indoor_allowed(9)
• regulatory_propagate_dfs_state(9)
• reg_dfs_domain_same(9)
• reg_reload_regdb(9)
• reg_check_channels(9)
• reg_leave_invalid_chans_wk(9)
• reg_leave_invalid_nan_wk(9)

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⭐ real talk: everything above is from ./net/wireless, dated October 2026, and the page is cfg80211_get_unii(9) — so if you ever need to cite her, that's the receipt, bestie 🧚

and that's the whole page!! short, sweet, and absolutely iconic — go get those bands sorted 💖🌸🦋