OID for ESN in RF ARP Table

Hi,

I can´t seem to find the OID for ESN in the Public RF ARP Table.

DHCP lease ESN is ok and the radio itself. 

edit: bridge table is ok (.1.3.6.1.4.1.161.19.3.3.4.1.1). But for SMs in NAT mode I still need the ARP table.

Anyone know what it is or if it´s even avaliable?

Thanks!