Band & channel decoder
From a channel number to a licensee.
Field-test screens and modem logs report channels as NR-ARFCNs and EARFCNs. Enter one, or a frequency in MHz, and see the exact frequency, the bands it belongs to and who is licensed there in the county you choose.
Enter a channel number to begin. Nothing you type leaves your browser.
How the numbers work
An NR-ARFCN is a position on 5G's global frequency raster. Below 3 GHz each step is 5 kHz; from 3 to 24.25 GHz each step is 15 kHz; above that, 60 kHz. The number identifies a frequency exactly and says nothing about the band, which is why one frequency can belong to several overlapping bands.
An EARFCN is LTE's equivalent. Each LTE band has its own numbering range in 100 kHz steps, so an EARFCN identifies both the band and the frequency.
What the answer means
The decoder reports the centre frequency your phone named, then looks up which licence block contains it in the chosen county. The carrier shown is the one licensed at that frequency. If your phone is using it, that is almost certainly whose signal you are on, or a partner roaming on it.
Channels at a block edge can straddle two licences; the table on the county page shows the neighbours.