NumberResearchThousands-blocks in 928-299
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 928-299 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 928 blocks
Most active assignees, all time — NPA 928
New assignments by month
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2015-03-05 | 928-299-0XXX | 0000–0999 | Assigned | T-MOBILE USA, INC. | 6529 | BULLHEADCY | AZ |
| 2015-01-07 | 928-299-1XXX | 1000–1999 | Assigned | T-MOBILE USA, INC. | 6529 | BULLHEADCY | AZ |
| 2014-02-11 | 928-299-2XXX | 2000–2999 | Assigned | CSC VOICE, LLC | 612K | BULLHEADCY | AZ |
| 2014-02-11 | 928-299-3XXX | 3000–3999 | Assigned | CSC VOICE, LLC | 612K | BULLHEADCY | AZ |
| 2014-02-11 | 928-299-4XXX | 4000–4999 | Assigned | CSC VOICE, LLC | 612K | BULLHEADCY | AZ |
| 2014-02-11 | 928-299-5XXX | 5000–5999 | Assigned | CSC VOICE, LLC | 612K | BULLHEADCY | AZ |
| 2014-10-01 | 928-299-6XXX | 6000–6999 | Assigned | T-MOBILE USA, INC. | 6529 | BULLHEADCY | AZ |
| 2016-05-05 | 928-299-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | BULLHEADCY | AZ |
| 2014-04-14 | 928-299-8XXX | 8000–8999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | BULLHEADCY | AZ |
| 2014-07-15 | 928-299-9XXX | 9000–9999 | Assigned | T-MOBILE USA, INC. | 6529 | BULLHEADCY | AZ |
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.