Maintain an Infoblox IB-1852-A appliance with a three-year Level 3+ maintenance entitlement that includes network services. IB-MAIN-1852-A-NS1GRID-2DC-23 is a service offering tied to the named IB-1852-A platform rather than a hardware appliance. It establishes a stated maintenance period for deployments that require continued service coverage for that specific Infoblox system. The three-year duration distinguishes this entitlement from shorter maintenance terms and makes it suitable when the coverage period needs to extend across a planned operating cycle. The Level 3+ designation identifies the maintenance tier, while the network services designation identifies the associated service scope. These two designations should be retained when matching the entitlement to an existing IB-1852-A environment. Select this service when the installed platform is specifically an IB-1852-A and the requirement calls for three years of Level 3+ maintenance with network services. The ordering code combines platform applicability, maintenance tier, service designation, and duration in one identifier. It does not replace or change the underlying appliance model; it supplies the maintenance and network-services entitlement associated with that appliance.