<P> This range is documented as only being allowed as a licensed band in the United States . Please see IEEE 802.11 y for details . </P> <P> Countries apply their own regulations to the allowable channels, allowed users and maximum power levels within these frequency ranges . </P> <P> A 40 MHz band is available from 3655--3695 MHz . It may be divided into eight 5 MHz channels, four 10 MHz channels, or two 20 MHz channels, as follows: </P> <Table> <Tr> <Th> Channel </Th> <Th> Frequency (MHz) </Th> <Th_colspan="3"> United States </Th> </Tr> <Tr> <Th> 5 MHz </Th> <Th> 10 MHz </Th> <Th> 20 MHz </Th> </Tr> <Tr> <Td> 131 </Td> <Td> 3657.5 </Td> <Td> Yes </Td> <Td> No </Td> <Td> No </Td> </Tr> <Tr> <Td> 132 </Td> <Td> 3660.0 </Td> <Td> No </Td> <Td> Yes </Td> </Tr> <Tr> <Td> 3662.5 </Td> <Td> Yes </Td> <Td> No </Td> </Tr> <Tr> <Td> 133 </Td> <Td> 3665.0 </Td> <Td> No </Td> <Td> Yes </Td> </Tr> <Tr> <Td> No </Td> </Tr> <Tr> <Td> 3667.5 </Td> <Td> Yes </Td> <Td> No </Td> </Tr> <Tr> <Td> 134 </Td> <Td> 3670.0 </Td> <Td> No </Td> <Td> Yes </Td> </Tr> <Tr> <Td> 3672.5 </Td> <Td> Yes </Td> <Td> No </Td> </Tr> <Tr> <Td> 135 </Td> <Td> 3675.0 </Td> <Td> No </Td> </Tr> <Tr> <Td> No </Td> <Td> No </Td> </Tr> <Tr> <Td> 3677.5 </Td> <Td> Yes </Td> </Tr> <Tr> <Td> 136 </Td> <Td> 3680.0 </Td> <Td> No </Td> <Td> Yes </Td> </Tr> <Tr> <Td> 3682.5 </Td> <Td> Yes </Td> <Td> No </Td> </Tr> <Tr> <Td> 137 </Td> <Td> 3685.0 </Td> <Td> No </Td> <Td> Yes </Td> </Tr> <Tr> <Td> No </Td> </Tr> <Tr> <Td> 3687.5 </Td> <Td> Yes </Td> <Td> No </Td> </Tr> <Tr> <Td> 138 </Td> <Td> 3690.0 </Td> <Td> No </Td> <Td> Yes </Td> </Tr> <Tr> <Td> 3692.5 </Td> <Td> Yes </Td> <Td> No </Td> </Tr> </Table>

How many channels are available with 802.11a in some countries