This read-write OCTET STRING packs up to 100 addresses, 0 to 700 bytes total, as 6-byte MAC-plus-1-byte-port entries, used specifically for bulk-dumping blocks of the switch's MAC address table, where a port number of zero flags a specially configured address rather than a dynamically learned one. An admin's management script reads this after a read-block operation to retrieve many address table entries in one SNMP exchange rather than walking them one at a time, and can distinguish specially configured addresses from learned ones by checking each entry's port byte for zero. For example, a script performing a full address-table export would repeatedly issue read-block(6) operations and parse each returned kxaddrBlock buffer into individual MAC-address-plus-port records, flagging any entry with a zero port byte as a specially configured address rather than one learned from live traffic.