The Free On-line Dictionary of Computing (19 January 2023):

Corporation for Research and Educational Networking
CREN

    (CREN) The organisation responsible for providing
   networking service to BITNET and CSNET users.  CREN was
   formed in October 1989, when BITNET and CSNET were
   combined under one authority.  CSNET is no longer
   operational, but CREN still runs BITNET.

   [Still true?]

   (1996-05-17)