Based on the details you provided looks like you are trying to do 2 things 1) Change the Management subnet for the MRs/APs. 2) Assign static IPs to Meraki MRs/APs For example let's consider the current subnet for APs are 192.168.1.0/28 and you are changing this current subnet to 192.168.2.0/28. Before making the subnet changes if you have given any fixed IPs from this subnet remove it you can navigate to Security & SDWAN -> DHCP -> you can find the required details under the VLANs. Second edit the VLAN and save it with your new subnet range. Once you have configure the new VLAN, we want the APs to send a new DHCP Discover packets so either shut/un-shut the AP connected port or reboot the APs if needed. Once APs are online and Up you can navigate to Security & SDWAN -> DHCP -> VLAN of the APs -> you can configure fixed IP ( static IPs for the APs). Usually the Dashboard will take sometime to reflect all of these changes so be patience. You can refer the below Doc for configuring fixed IPs Note: Assuming the DHCP Server for the VLAN is running on the MX or MS. https://documentation.meraki.com/Platform_Management/Dashboard_Administration/Design_and_Configure/Configuration_Guides/Routing_and_Firewall/Configuring_DHCP_Services_on_the_MX_and_MS
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