Block a range of phone numbers

I am receiving 6-8 spam calls each day from a particular range of numbers. The numbers have the same area code and first four digits, but the last 3 digits vary. I cannot effectively manage 1000 (or more) numbers in my block list.

The suggested solution is to allow a user or admin to block a range of numbers, e.g.,

+1 (999) 555-7***

would block any number in the range (999) 555-7000 through (999) 555-7999.

The wildcard digits do not have to be at the end of the number: to block a particular exchange (to use the old POTS terminology) from any US area code:

+1 (***) 555-****

or block all cellular calls from China:

+86 1** **** ****