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

PLAINVILLE prefixes in area code 860

NANPA records 8 assigned NXX blocks to rate center PLAINVILLE in area code 860, 1.0% of the 783 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. 5 holders hold those blocks, the largest being SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT (3), ONVOY, LLC - CT (2), MCIMETRO ACCESS TRANSMISSION SERVICES LLC (1). 6 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 785, 812, 959 – overlay codes cover the same geography, so a rate center is served by all of them.

8 assigned blocks – 1% of 860
5 holders of record
6 of them pooled in 1,000-number lots

Prefixes assigned here

PrefixHolder of recordAssignedPooledIn service
860-351 Verizon MCIMETRO ACCESS TRANSMISSION SERVICES LLC – yes yes
860-410 AT&T SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT – yes yes
860-479 Comcast COMCAST IP PHONE, LLC – yes yes
860-517 AT&T TELEPORT COMMUNICATIONS AMERICA, LLC - CT – yes yes
860-747 AT&T SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT – no yes
860-793 AT&T SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT – no yes
860-846 Onvoy ONVOY, LLC - CT – yes yes
860-855 Onvoy ONVOY, LLC - CT – 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
SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT AT&T 3 37.5%
ONVOY, LLC - CT Onvoy 2 25%
MCIMETRO ACCESS TRANSMISSION SERVICES LLC Verizon 1 12.5%
COMCAST IP PHONE, LLC Comcast 1 12.5%
TELEPORT COMMUNICATIONS AMERICA, LLC - CT AT&T 1 12.5%

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 PLAINVILLE in area code 860?

8 blocks: 351, 410, 479, 517, 747, 793, 846, 855. The table above gives the holder of each.

Which carriers have numbers in PLAINVILLE?

SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT (3 blocks), ONVOY, LLC - CT (2 blocks), MCIMETRO ACCESS TRANSMISSION SERVICES LLC (1 block), COMCAST IP PHONE, LLC (1 block), TELEPORT COMMUNICATIONS AMERICA, LLC - CT (1 block). These are the holders on record; the carrier actually serving a given number can differ, because numbers move with their owners.

Is PLAINVILLE 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 860

All 783 prefixes in 860