Custom SNMP Monitor of ipNetToMediaPhysAddress

Custom SNMP Monitor of ipNetToMediaPhysAddress

Hello, 
we are trying to monitor a router's ipNetToMediaPhysAddress, what we are trying to achieve is to be able to monitor all the IP addresses assigned by the router, we have done the following:
create a custom SNMP on the OID .1.3.6.1.2.1.4.22.1.2 to be able to do it. But when we check the monitorization all we're able to see is the Instance and the Value which is the MAC Address.
Which OID or configuration we would have to do in order to be able to see the IP Addresses?
Thanks.

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