NumberResearchThousands-blocks in 307-278
This prefix’s ten 1,000-number blocks and who holds each — 10 on record · from the daily NANPA thousands-block report, 09/20/2026
The ten 1,000-number thousand-blocks inside prefix 307-278 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 307 blocks
Most active assignees, all time — NPA 307
New assignments by month
Sep 2026
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2006-05-05 | 307-278-0XXX | 0000–0999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | BUFFALO | WY |
| 2010-01-22 | 307-278-1XXX | 1000–1999 | Assigned | BANDWIDTH.COM CLEC, LLC - WY | 081F | BUFFALO | WY |
| 2012-01-30 | 307-278-2XXX | 2000–2999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - WY | 9416 | BUFFALO | WY |
| 2010-03-04 | 307-278-3XXX | 3000–3999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | BUFFALO | WY |
| 2021-10-21 | 307-278-4XXX | 4000–4999 | Assigned | ONVOY SPECTRUM, LLC | 624H | BUFFALO | WY |
| 2020-01-02 | 307-278-5XXX | 5000–5999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - WY | 9416 | BUFFALO | WY |
| 2005-02-01 | 307-278-6XXX | 6000–6999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - WY | 9416 | BUFFALO | WY |
| 2006-09-22 | 307-278-7XXX | 7000–7999 | Assigned | ONVOY, LLC - WY | 450F | BUFFALO | WY |
| 2020-04-01 | 307-278-8XXX | 8000–8999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | BUFFALO | WY |
| 2008-11-03 | 307-278-9XXX | 9000–9999 | Assigned | BANDWIDTH.COM CLEC, LLC - WY | 081F | BUFFALO | WY |
Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/20/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.