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

BRANFORD prefixes in area code 203

NANPA records 10 assigned NXX blocks to rate center BRANFORD in area code 203, 1.3% 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. 5 holders hold those blocks, the largest being SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT (5), COMCAST IP PHONE, LLC (2), PAETEC ITEL, 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 386, 475 – overlay codes cover the same geography, so a rate center is served by all of them.

10 assigned blocks – 1.3% of 203
5 holders of record
6 of them pooled in 1,000-number lots

Prefixes assigned here

PrefixHolder of recordAssignedPooledIn service
203-208 Comcast COMCAST IP PHONE, LLC – yes yes
203-315 AT&T SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT – no yes
203-433 Comcast COMCAST IP PHONE, LLC – yes yes
203-481 AT&T SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT – no yes
203-483 AT&T SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT – no yes
203-484 AT&T SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT – yes yes
203-488 AT&T SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT – no yes
203-643 Windstream PAETEC ITEL, LLC – yes yes
203-646 Onvoy ONVOY, LLC - CT – yes yes
203-871 AT&T TELEPORT COMMUNICATIONS AMERICA, 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 5 50%
COMCAST IP PHONE, LLC Comcast 2 20%
PAETEC ITEL, LLC Windstream 1 10%
ONVOY, LLC - CT Onvoy 1 10%
TELEPORT COMMUNICATIONS AMERICA, LLC - CT AT&T 1 10%

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 BRANFORD in area code 203?

10 blocks: 208, 315, 433, 481, 483, 484, 488, 643, 646, 871. The table above gives the holder of each.

Which carriers have numbers in BRANFORD?

SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT (5 blocks), COMCAST IP PHONE, LLC (2 blocks), PAETEC ITEL, LLC (1 block), ONVOY, LLC - CT (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 BRANFORD 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 203

All 784 prefixes in 203