As of 1 January 2017 CERT.be will be operated by the Centre for Cybersecurity Belgium (CCB).
All activities of CERT.be, now operated by the Belgian national research network Belnet, will be transferred to the CCB. You can still report cybersecurity incidents via cert [at] cert [dot] be.
The phone number changes to 02 501 05 60.
Do you want to report an incident? You can find more information here.