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

SIASCONSET prefixes in area code 774

NANPA records 3 assigned NXX blocks to rate center SIASCONSET in area code 774, 0.6% of the 522 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 ONVOY, LLC - MA (1), LEVEL 3 COMMUNICATIONS, LLC - MA (1), NEW CINGULAR WIRELESS PCS, LLC - DC (1). The earliest assignment on record here is 2001-12-21 and the most recent 2021-04-01. 3 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 code 508 – overlay codes cover the same geography, so a rate center is served by all of them.

3 assigned blocks – 0.6% of 774
3 holders of record
3 of them pooled in 1,000-number lots

Prefixes assigned here

PrefixHolder of recordAssignedPooledIn service
774-547 Onvoy ONVOY, LLC - MA 2021-04-01 yes yes
774-768 Lumen LEVEL 3 COMMUNICATIONS, LLC - MA 2001-12-21 yes yes
774-812 AT&T NEW CINGULAR WIRELESS PCS, LLC - DC 2015-06-15 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
ONVOY, LLC - MA Onvoy 1 33.3%
LEVEL 3 COMMUNICATIONS, LLC - MA Lumen 1 33.3%
NEW CINGULAR WIRELESS PCS, LLC - DC AT&T 1 33.3%

Frequently asked

Which prefixes belong to SIASCONSET in area code 774?

3 blocks: 547, 768, 812. The table above gives the holder of each.

Which carriers have numbers in SIASCONSET?

ONVOY, LLC - MA (1 block), LEVEL 3 COMMUNICATIONS, LLC - MA (1 block), NEW CINGULAR WIRELESS PCS, LLC - DC (1 block). These are the holders on record; the carrier actually serving a given number can differ, because numbers move with their owners.

Is SIASCONSET 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 774

All 522 prefixes in 774