Here is a step by step of how to find an MIB and it's OID details :
a) Select the product family in the following link :
b) Select the OS…. IOS/CatOS
c) From the list select the MIB for feature for which you want to find the OID
( for example BGP ). This will give you a complete list of all MIB for a particular feature.
d) Now copy any single MIB name from the file ( for example we select bgpPeerTable )
e) Paste this MIB name in the following tool ( SNMP object Navigator )to retrieve the OID :
For eg if we put “bgpPeerTable” we get “126.96.36.199.188.8.131.52”
A MIB browser does more that just give the OID of a MIB object. It allows querying a device for an Object and getting the value. Good browsers also allow MIB compilation. I also need a good browser because PI doesn't seem to provide those services.