Mae'r cynnwys hwn ar gael yn Saesneg yn unig.

Spectrum information portal

Please view our guide to using Ofcom’s System Information System (SIS) to understand how to use the portal.

Please direct any feedback on your experience of the spectrum information portal to: spectrumportalfeedback@ofcom.org.uk

For the best experience, expand to full screen (click on the button in the bottom right corner).

Data files

View the spectrum information portal data files: