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

BASALT prefixes in area code 970

NANPA records 6 assigned NXX blocks to rate center BASALT 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. 6 holders hold those blocks, the largest being SAN ISABEL TELECOM, INC. - CO (1), LEVEL 3 COMMUNICATIONS, LLC - CO (1), COMMIO, LLC (1). The earliest assignment on record here is 2004-10-27 and the most recent 2023-08-11. 4 of them are in thousands-block pooling, so those prefixes are shared between carriers in 1,000-number lots.

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

Prefixes assigned here

PrefixHolder of recordAssignedPooledIn service
970-273 SAN ISABEL TELECOM, INC. - CO 2006-05-18 no yes
970-279 Lumen LEVEL 3 COMMUNICATIONS, LLC - CO 2004-10-27 yes yes
970-603 COMMIO, LLC 2023-08-11 yes yes
970-678 INTERLINK ADV SVC DBA FORETHOUGHT.NET - CO 2017-03-17 yes yes
970-718 Peerless PEERLESS NETWORK OF COLORADO, LLC - CO 2013-04-10 yes yes
970-927 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
SAN ISABEL TELECOM, INC. - CO – 1 16.7%
LEVEL 3 COMMUNICATIONS, LLC - CO Lumen 1 16.7%
COMMIO, LLC – 1 16.7%
INTERLINK ADV SVC DBA FORETHOUGHT.NET - CO – 1 16.7%
PEERLESS NETWORK OF COLORADO, LLC - CO Peerless 1 16.7%
QWEST CORPORATION Lumen 1 16.7%

Frequently asked

Which prefixes belong to BASALT in area code 970?

6 blocks: 273, 279, 603, 678, 718, 927. The table above gives the holder of each.

Which carriers have numbers in BASALT?

SAN ISABEL TELECOM, INC. - CO (1 block), LEVEL 3 COMMUNICATIONS, LLC - CO (1 block), COMMIO, LLC (1 block), INTERLINK ADV SVC DBA FORETHOUGHT.NET - CO (1 block), PEERLESS NETWORK OF COLORADO, LLC - CO (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 BASALT 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