NumberResearchThousands-blocks in 308-257
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 308-257 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 308 blocks
Most active assignees, all time — NPA 308
New assignments by month
Sep 2026
Aug 2026
Jul 2026
Jun 2026
May 2026
Apr 2026
Mar 2026
Feb 2026
Jan 2026
Dec 2025
Nov 2025
Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2023-08-03 | 308-257-0XXX | 0000–0999 | Assigned | TELNYX LLC | 073H | NO PLATTE | NE |
| 2023-04-04 | 308-257-1XXX | 1000–1999 | Assigned | COMCAST IP PHONE, LLC | 318J | NO PLATTE | NE |
| 2024-03-20 | 308-257-2XXX | 2000–2999 | Assigned | ONVOY, LLC - NE | 549E | NO PLATTE | NE |
| 2024-04-17 | 308-257-3XXX | 3000–3999 | Assigned | ONVOY, LLC - NE | 549E | NO PLATTE | NE |
| 2025-03-26 | 308-257-4XXX | 4000–4999 | Assigned | METROPCS, INC. | 5562 | NO PLATTE | NE |
| 2025-11-05 | 308-257-5XXX | 5000–5999 | Assigned | ONVOY, LLC - NE | 549E | NO PLATTE | NE |
| 2025-03-19 | 308-257-6XXX | 6000–6999 | Assigned | AERIAL COMMUNICATIONS, INC. | 6701 | NO PLATTE | NE |
| 2024-12-04 | 308-257-7XXX | 7000–7999 | Assigned | ONVOY SPECTRUM, LLC | 624H | NO PLATTE | NE |
| 2024-06-05 | 308-257-8XXX | 8000–8999 | Assigned | ONVOY, LLC - NE | 549E | NO PLATTE | NE |
| 2024-08-01 | 308-257-9XXX | 9000–9999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | NO PLATTE | NE |
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.