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

DELTA prefixes in area code 970

NANPA records 6 assigned NXX blocks to rate center DELTA in area code 970, 0.8% of the 786 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 ONVOY, LLC - CO (2), FASTTRACK COMMUNICATIONS, INC. - CO (1), BANDWIDTH.COM CLEC, LLC - CO (1). The earliest assignment on record here is 2005-03-01 and the most recent 2016-06-23. 4 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 223, 256, 318, 419 – overlay codes cover the same geography, so a rate center is served by all of them.

6 assigned blocks – 0.8% of 970
5 holders of record
4 of them pooled in 1,000-number lots

Prefixes assigned here

PrefixHolder of recordAssignedPooledIn service
970-399 FASTTRACK COMMUNICATIONS, INC. - CO – yes yes
970-540 Onvoy ONVOY, LLC - CO 2005-03-01 yes yes
970-546 Bandwidth BANDWIDTH.COM CLEC, LLC - CO 2016-06-23 yes yes
970-751 UNION TELEPHONE COMPANY 2012-05-08 no yes
970-808 Onvoy ONVOY, LLC - CO 2011-01-12 yes yes
970-874 Lumen QWEST CORPORATION – 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
ONVOY, LLC - CO Onvoy 2 33.3%
FASTTRACK COMMUNICATIONS, INC. - CO – 1 16.7%
BANDWIDTH.COM CLEC, LLC - CO Bandwidth 1 16.7%
UNION TELEPHONE COMPANY – 1 16.7%
QWEST CORPORATION Lumen 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 DELTA in area code 970?

6 blocks: 399, 540, 546, 751, 808, 874. The table above gives the holder of each.

Which carriers have numbers in DELTA?

ONVOY, LLC - CO (2 blocks), FASTTRACK COMMUNICATIONS, INC. - CO (1 block), BANDWIDTH.COM CLEC, LLC - CO (1 block), UNION TELEPHONE COMPANY (1 block), QWEST CORPORATION (1 block). These are the holders on record; the carrier actually serving a given number can differ, because numbers move with their owners.

Is DELTA 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 970

All 786 prefixes in 970