I had a Netgear Nighthawk XR300 and it can reserve 64 IP addresses (128 will be ideal) and I am replacing with something better/newer/more powerful/easier to manage. Number of IP reservations is not something commonly advertised as a feature or specification and is not commonly discussed at forums either. I was in an online chat with TP-Link and even the customer service can't tell me for sure which model has what reservation limits. So does I hope people here can post their home router models with corresponding address reservation limits. Please do not include any enterprise routers (I also have a Sophos SG115rev2).
So I start with mine:
Netgear Nighthawk XR300 - 64
TP-Link Archer C2300 - 32
Linksys EA6700 - 32
Is this the setting you are referring to?
Asus RT-AC86U
Manually Assigned IP around the DHCP list (Max Limit : 128)