NumberResearchThousands-blocks in 307-228
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 307-228 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 |
|---|---|---|---|---|---|---|---|
| 2014-05-28 | 307-228-0XXX | 0000–0999 | Assigned | BANDWIDTH.COM CLEC, LLC - WY | 081F | GILLETTE | WY |
| 2015-04-16 | 307-228-1XXX | 1000–1999 | Assigned | BANDWIDTH.COM CLEC, LLC - WY | 081F | GILLETTE | WY |
| 2014-08-04 | 307-228-2XXX | 2000–2999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - WY | 9416 | GILLETTE | WY |
| 2014-10-14 | 307-228-3XXX | 3000–3999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WY | 6566 | GILLETTE | WY |
| 2015-04-16 | 307-228-4XXX | 4000–4999 | Assigned | BANDWIDTH.COM CLEC, LLC - WY | 081F | GILLETTE | WY |
| 2021-04-30 | 307-228-5XXX | 5000–5999 | Assigned | BANDWIDTH.COM CLEC, LLC - WY | 081F | GILLETTE | WY |
| 2014-08-25 | 307-228-6XXX | 6000–6999 | Assigned | TELEPORT COMMUNICATIONS AMERICA WY-LLC | 879G | GILLETTE | WY |
| 2020-08-06 | 307-228-7XXX | 7000–7999 | Assigned | ONVOY, LLC - WY | 450F | GILLETTE | WY |
| 2019-10-10 | 307-228-8XXX | 8000–8999 | Assigned | AIRUS, INC. - WY | 581H | GILLETTE | WY |
| 2018-04-26 | 307-228-9XXX | 9000–9999 | Assigned | AIRUS, INC. - WY | 581H | GILLETTE | 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.