Either 256 or 65536?

I think I may run out of the 256 NAT IP's due to virtual things. If I change the netmask to, does all ~ becomes one network? Can I make, something like, only ~ one network so that I can have maximum 2560 hosts?

you can use this ip subnet calculator to help you.

using the mask you'll cover from to
Number of Usable Hosts: 4,094

Isn't this enough for you ?
Subnet Mask:
Usable Host IP Range: -
Number of Usable Hosts: 2,046


The OpenWrt netmask can also be configured with CIDR notation like instead of a 4 number netmask. Leave the netmask field blank when using CIDR.

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