NumberResearchThousands-blocks in 970-399
This prefix’s ten 1,000-number blocks and who holds each — 10 on record · from the daily NANPA thousands-block report, 09/19/2026
The ten 1,000-number thousand-blocks inside prefix 970-399 and who was initially assigned each. Under pooling these blocks often belong to different carriers — the single prefix-level “assignee” is usually just the pool / code holder, not who holds the numbers. ← all 970 blocks
Most active assignees, all time — NPA 970
New assignments by month
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| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2009-11-13 | 970-399-0XXX | 0000–0999 | Assigned | FASTTRACK COMMUNICATIONS, INC. - CO | 330B | DELTA | CO |
| 2010-12-14 | 970-399-1XXX | 1000–1999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CO | 6118 | DELTA | CO |
| 2006-05-16 | 970-399-2XXX | 2000–2999 | Assigned | QWEST CORPORATION | 9636 | DELTA | CO |
| 2005-07-14 | 970-399-3XXX | 3000–3999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | DELTA | CO |
| 2008-03-24 | 970-399-4XXX | 4000–4999 | Assigned | FASTTRACK COMMUNICATIONS, INC. - CO | 330B | DELTA | CO |
| 2010-06-03 | 970-399-5XXX | 5000–5999 | Assigned | BANDWIDTH.COM CLEC, LLC - CO | 078F | DELTA | CO |
| — | 970-399-6XXX | 6000–6999 | Available | DELTA | CO | ||
| 2006-10-09 | 970-399-7XXX | 7000–7999 | Assigned | ONVOY, LLC - CO | 026D | DELTA | CO |
| 2010-07-01 | 970-399-8XXX | 8000–8999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | DELTA | CO |
| 2010-09-09 | 970-399-9XXX | 9000–9999 | Assigned | BANDWIDTH.COM CLEC, LLC - CO | 078F | DELTA | CO |
Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.