NumberResearchThousands-blocks in 628-977
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 628-977 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 628 blocks
Most active assignees, all time — NPA 628
New assignments by month
Sep 2026
Aug 2026
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2020-07-30 | 628-977-0XXX | 0000–0999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | SNFC MT-EV | CA |
| 2021-11-01 | 628-977-1XXX | 1000–1999 | Assigned | ONVOY, LLC - CA | 649C | SNFC MT-EV | CA |
| — | 628-977-2XXX | 2000–2999 | Available | SNFC MT-EV | CA | ||
| 2024-07-22 | 628-977-3XXX | 3000–3999 | Assigned | ONVOY SPECTRUM, LLC | 624H | SNFC MT-EV | CA |
| 2020-08-11 | 628-977-4XXX | 4000–4999 | Assigned | SONIC TELECOM, LLC - CA | 433E | SNFC MT-EV | CA |
| 2020-09-14 | 628-977-5XXX | 5000–5999 | Assigned | ONVOY, LLC - CA | 649C | SNFC MT-EV | CA |
| 2020-09-14 | 628-977-6XXX | 6000–6999 | Assigned | ONVOY, LLC - CA | 649C | SNFC MT-EV | CA |
| 2020-07-10 | 628-977-7XXX | 7000–7999 | Assigned | FRACTEL, LLC | 965H | SNFC MT-EV | CA |
| 2026-04-03 | 628-977-8XXX | 8000–8999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | SNFC MT-EV | CA |
| 2022-10-10 | 628-977-9XXX | 9000–9999 | Assigned | T-MOBILE USA, INC. | 6529 | SNFC MT-EV | CA |
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.