Hi,
This is quite challenging. Normally system will reserve IP based on full MAC address. This is because MAC address is unique for a device. If based on the first 4-6 digit, the system will have difficulty in assigning IP since there is no unique entity for system to recognize. May be you can share your thought to achieve this?
Alternatively, you may pre-defined all IPs you want to reserve in notepad. Then paste into DHCP Reservation section in our box. This will more simple to add a batch of reserved IPs. Please find the screen shot below for better understanding.
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Pre-defined all the related Name, Mac-address and IP in notepad then follow screen-shot below
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Copy and paste the info from notepad to DHCP Reservation section.
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Follow the screen shot below
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Done
Hope this help.