Difference between single GETNEXT and series GETNEXT by WALK

I’m intercepting snmp request using CommandResponder from SNMP4J. Can I somehow understand which request came from a single “getnext” or the first of a series with a “walk” request? We don’t load MIB for device.

No, a single GETNEXT is not distinguishable on the wire from a GETNEXT being part of a series of GETNEXT in a „Walk“ operation.