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

READING prefixes in area code 517

NANPA records 4 assigned NXX blocks to rate center READING in area code 517, 0.6% of the 616 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. 4 holders hold those blocks, the largest being FRONTIER NORTH, INC. - MI (1), INTERACTIVE SERVICES NETWORK, INC. (1), CHARTER IP ENABLED SERVICES, LLC (1). The earliest assignment on record here is 2001-11-15 and the most recent 2007-10-02. 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 484, 610, 620, 781 – overlay codes cover the same geography, so a rate center is served by all of them.

4 assigned blocks – 0.6% of 517
4 holders of record
2 of them pooled in 1,000-number lots

Prefixes assigned here

PrefixHolder of recordAssignedPooledIn service
517-283 Frontier FRONTIER NORTH, INC. - MI – yes yes
517-658 INTERACTIVE SERVICES NETWORK, INC. 2002-03-27 no yes
517-901 Charter CHARTER IP ENABLED SERVICES, LLC 2007-10-02 yes yes
517-970 ACD TELECOM, INC. - MI 2001-11-15 no 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
FRONTIER NORTH, INC. - MI Frontier 1 25%
INTERACTIVE SERVICES NETWORK, INC. – 1 25%
CHARTER IP ENABLED SERVICES, LLC Charter 1 25%
ACD TELECOM, INC. - MI – 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 READING in area code 517?

4 blocks: 283, 658, 901, 970. The table above gives the holder of each.

Which carriers have numbers in READING?

FRONTIER NORTH, INC. - MI (1 block), INTERACTIVE SERVICES NETWORK, INC. (1 block), CHARTER IP ENABLED SERVICES, LLC (1 block), ACD TELECOM, INC. - MI (1 block). These are the holders on record; the carrier actually serving a given number can differ, because numbers move with their owners.

Is READING 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 517

All 616 prefixes in 517