This read-write OCTET STRING holds 0 to 700 octets representing up to 100 addresses, each encoded as a 6-octet MAC address followed by a 1-byte port number, where a port number of zero marks a specially configured address rather than a dynamically learned one. An administrator uses it as a bulk-transfer mechanism to pull large numbers of address entries in a single SNMP operation instead of walking them one at a time. For example, the admin uses addrBlock to dump 100 learned addresses in a single poll rather than issuing 100 separate addrIndex and addrOperation reads.