Bridge table size

Most of cable modem spec sheets I have do not list the maximum number of MAC addresses that can be learned by the cable modem.

Could someone confirm that the Motorola SB6121 supports a maximum of 32 CPEs?

In the Cablelabs L2VPN spec they talk of upping the size of the bridge table to 128 entries. Does anyone know any specific DOCSIS 3.0 modems that support 128 or more CPEs. I am looking for a basic cable modem; no router, no switch, no wifi...