In the "members" table there is a column "local". This is an integer value used as a bitmask with the following meaning:
Val Local
1     AAMTA
2     MTAB
4     CCMTA
8     MTACC
16    ESMTA
32    FCMTA
64    MTAGB
128   GCMTA
256   GLMTA
512   HCMTA
1024  MCMTA
2048  MTASM
4096  PGMTA