NumberResearchThousands-blocks in 308-550
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 308-550 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 |
|---|---|---|---|---|---|---|---|
| — | 308-550-0XXX | 0000–0999 | Reserved | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NE | 5807 | FULLERTON | NE |
| — | 308-550-1XXX | 1000–1999 | Reserved | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NE | 5807 | FULLERTON | NE |
| — | 308-550-2XXX | 2000–2999 | Reserved | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NE | 5807 | FULLERTON | NE |
| 2024-01-30 | 308-550-3XXX | 3000–3999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NE | 5807 | FULLERTON | NE |
| 2016-08-10 | 308-550-4XXX | 4000–4999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | FULLERTON | NE |
| 2018-11-14 | 308-550-5XXX | 5000–5999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - NE | 3233 | FULLERTON | NE |
| 2021-03-04 | 308-550-6XXX | 6000–6999 | Assigned | ONVOY, LLC - NE | 549E | FULLERTON | NE |
| 2014-12-03 | 308-550-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | FULLERTON | NE |
| 2019-11-22 | 308-550-8XXX | 8000–8999 | Assigned | ONVOY, LLC - NE | 549E | FULLERTON | NE |
| 2022-07-18 | 308-550-9XXX | 9000–9999 | Assigned | TELNYX LLC | 073H | FULLERTON | NE |
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.