NumberingData
Verified Nov 1, 2026 · Source: NANPA CO Code Assignment Records

GREENCASTL prefixes in area code 717

NANPA records 4 assigned NXX blocks to rate center GREENCASTL in area code 717, 0.5% of the 784 blocks assigned in the code. A rate center is the billing geography a block is allocated to – NANPA truncates the name to ten characters, so read it as a NANPA label rather than a town. 3 holders hold those blocks, the largest being BRIGHTSPEED OF PENNSYLVANIA, LLC (2), COMCAST IP PHONE, LLC (1), CORE COMMUNICATIONS, INC. - PA (1). The earliest assignment on record here is 2006-06-27 and the most recent 2009-03-18. 2 of them are in thousands-block pooling, so those prefixes are shared between carriers in 1,000-number lots. The same rate center name also appears in area codes 223, 765 – overlay codes cover the same geography, so a rate center is served by all of them.

4 assigned blocks – 0.5% of 717
3 holders of record
2 of them pooled in 1,000-number lots

Prefixes assigned here

PrefixHolder of recordAssignedPooledIn service
717-593 Brightspeed BRIGHTSPEED OF PENNSYLVANIA, LLC – yes yes
717-597 Brightspeed BRIGHTSPEED OF PENNSYLVANIA, LLC – no yes
717-643 Comcast COMCAST IP PHONE, LLC 2006-06-27 no yes
717-895 CORE COMMUNICATIONS, INC. - PA 2009-03-18 yes yes

The holder is who received the block from the numbering administrator. It is not necessarily the carrier serving a given number: numbers move with their owners, and a pooled block is shared.

Who holds the blocks

HolderBrandBlocksShare here
BRIGHTSPEED OF PENNSYLVANIA, LLC Brightspeed 2 50%
COMCAST IP PHONE, LLC Comcast 1 25%
CORE COMMUNICATIONS, INC. - PA – 1 25%

Same rate center in other codes

Overlay codes cover the same geography, so one rate center is served by all of them.

Frequently asked

Which prefixes belong to GREENCASTL in area code 717?

4 blocks: 593, 597, 643, 895. The table above gives the holder of each.

Which carriers have numbers in GREENCASTL?

BRIGHTSPEED OF PENNSYLVANIA, LLC (2 blocks), COMCAST IP PHONE, LLC (1 block), CORE COMMUNICATIONS, INC. - PA (1 block). These are the holders on record; the carrier actually serving a given number can differ, because numbers move with their owners.

Is GREENCASTL a city?

It is a rate center – the unit NANPA allocates number blocks to. Its name is abbreviated to ten characters and is not necessarily a settlement: we print it as recorded rather than guess at the full name.

Other rate centers in 717

All 784 prefixes in 717