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# ifconfig -v wlan0 list chan
Channel   1 : 2412      MHz 11b          Channel   6 : 2437      MHz 11g ht/40+
Channel   1 : 2412      MHz 11g          Channel   6 : 2437      MHz 11g ht/40-
Channel   1 : 2412      MHz 11g ht/20    Channel   7 : 2442      MHz 11b
Channel   1 : 2412      MHz 11g ht/40+   Channel   7 : 2442      MHz 11g
Channel   2 : 2417      MHz 11b          Channel   7 : 2442      MHz 11g ht/20
Channel   2 : 2417      MHz 11g          Channel   7 : 2442      MHz 11g ht/40+
Channel   2 : 2417      MHz 11g ht/20    Channel   7 : 2442      MHz 11g ht/40-
Channel   2 : 2417      MHz 11g ht/40+   Channel   8 : 2447      MHz 11b
Channel   3 : 2422      MHz 11b          Channel   8 : 2447      MHz 11g
Channel   3 : 2422      MHz 11g          Channel   8 : 2447      MHz 11g ht/20
Channel   3 : 2422      MHz 11g ht/20    Channel   8 : 2447      MHz 11g ht/40-
Channel   3 : 2422      MHz 11g ht/40+   Channel   9 : 2452      MHz 11b
Channel   4 : 2427      MHz 11b          Channel   9 : 2452      MHz 11g
Channel   4 : 2427      MHz 11g          Channel   9 : 2452      MHz 11g ht/20
Channel   4 : 2427      MHz 11g ht/20    Channel   9 : 2452      MHz 11g ht/40-
Channel   4 : 2427      MHz 11g ht/40+   Channel  10 : 2457      MHz 11b
Channel   5 : 2432      MHz 11b          Channel  10 : 2457      MHz 11g
Channel   5 : 2432      MHz 11g          Channel  10 : 2457      MHz 11g ht/20
Channel   5 : 2432      MHz 11g ht/20    Channel  10 : 2457      MHz 11g ht/40-
Channel   5 : 2432      MHz 11g ht/40+   Channel  11 : 2462      MHz 11b
Channel   5 : 2432      MHz 11g ht/40-   Channel  11 : 2462      MHz 11g
Channel   6 : 2437      MHz 11b          Channel  11 : 2462      MHz 11g ht/20
Channel   6 : 2437      MHz 11g          Channel  11 : 2462      MHz 11g ht/40-
Channel   6 : 2437      MHz 11g ht/20