0-249 probably means 125.
* fine-grained categorisation large bulk, separately reports on numbers of NSLs, customer affected by NSLs, content FISA, customers affected by content FISA, non-content FISA and customers affected by non-content FISA in bands of 1000 (for each category) starting from 0-999 inclusive
* coarse-grained categorisation finer bulk, report only the aggregate number of FISA and NSL orders and the number of customers affected by that aggregate, but do so in bands of 250 (starting from 0-249 inclusive)
So "0-249" means "between 0 and 249", they're not allowed to be more precise at this point
[0] https://www.justice.gov/iso/opa/resources/422201412716042240...