If you can't or don't want to copy vendor-specific MIB files to the Zabbix server, you can always use numeric OIDs, like we did before. While not being as descriptive, they are guaranteed to work even if the copied MIBs are not available for some reason or are removed during a system upgrade.

But how do we derive the corresponding numeric OID from a textual one? While we could use snmpget to retrieve the particular value and output it in numeric form, that requires the availability of the device and network round trip. Fortunately, there's an easier way—the snmptranslate command. To find out the numeric form of the OID, we can use PowerNet-MIB::upsAdvIdentSerialNumber.0:

$ snmptranslate -On PowerNet-MIB::upsAdvIdentSerialNumber.0
.1.3.6.1.4.1.318.1.1.1.1.2.3.0

The default output format for Net-SNMP tools is the short textual one, which only outputs the MIB name and object name. If you would like to find out the corresponding textual name, use the following:

$ snmptranslate .1.3.6.1.2.1.1.1.0
SNMPv2-MIB::sysDescr.0  

You can also use the -Of flag to output an OID in full notation:

$ snmptranslate -Of PowerNet-MIB::upsAdvIdentSerialNumber.0
.iso.org.dod.internet.private.enterprises.apc.products.hardware.ups.upsIdent.upsAdvIdent.upsAdvIdentSerialNumber.0