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

SUMMERFLD prefixes in area code 743

NANPA records 6 assigned NXX blocks to rate center SUMMERFLD in area code 743, 3.7% of the 163 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 BANDWIDTH.COM CLEC, LLC - NC (2), ONVOY, LLC - NC (2), TON80 COMMUNICATIONS, LLC (1). The earliest assignment on record here is 2017-02-27 and the most recent 2024-05-15. 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 336, 618, 740, 785 – overlay codes cover the same geography, so a rate center is served by all of them.

6 assigned blocks – 3.7% of 743
4 holders of record
6 of them pooled in 1,000-number lots

Prefixes assigned here

PrefixHolder of recordAssignedPooledIn service
743-203 Bandwidth BANDWIDTH.COM CLEC, LLC - NC 2019-05-20 yes yes
743-228 Onvoy ONVOY, LLC - NC 2021-04-12 yes yes
743-233 Bandwidth BANDWIDTH.COM CLEC, LLC - NC 2019-08-16 yes yes
743-278 Onvoy ONVOY, LLC - NC 2024-05-15 yes yes
743-439 TON80 COMMUNICATIONS, LLC 2021-04-13 yes yes
743-777 Telnyx TELNYX LLC 2017-02-27 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
BANDWIDTH.COM CLEC, LLC - NC Bandwidth 2 33.3%
ONVOY, LLC - NC Onvoy 2 33.3%
TON80 COMMUNICATIONS, LLC – 1 16.7%
TELNYX LLC Telnyx 1 16.7%

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 SUMMERFLD in area code 743?

6 blocks: 203, 228, 233, 278, 439, 777. The table above gives the holder of each.

Which carriers have numbers in SUMMERFLD?

BANDWIDTH.COM CLEC, LLC - NC (2 blocks), ONVOY, LLC - NC (2 blocks), TON80 COMMUNICATIONS, LLC (1 block), TELNYX LLC (1 block). These are the holders on record; the carrier actually serving a given number can differ, because numbers move with their owners.

Is SUMMERFLD 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 743

All 163 prefixes in 743