NumberResearchRecent thousands-block assignments
9 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/19/2026
Most carrier growth happens here, not at the prefix level: under number pooling, carriers receive individual 1,000-number blocks (e.g. 626-470-0XXX) within already-assigned prefixes. Assignments are initial assignments — the current serving carrier of individual numbers may differ due to portability.
Most active assignees, last 30 days — NPA 928
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 |
|---|---|---|---|---|---|---|---|
| 2005-04-12 | 928-566-4XXX | 4000–4999 | Assigned | CSC VOICE, LLC | 612K | LKHAVASUCY | AZ |
| 2005-04-12 | 928-770-4XXX | 4000–4999 | Assigned | CSC VOICE, LLC | 612K | MOHAVE VLY | AZ |
| 2005-03-23 | 928-345-5XXX | 5000–5999 | Assigned | METROPCS, INC. | 5562 | YUMA | AZ |
| 2005-03-14 | 928-377-3XXX | 3000–3999 | Assigned | CSC VOICE, LLC | 612K | KINGMAN | AZ |
| 2005-03-14 | 928-466-9XXX | 9000–9999 | Assigned | CSC VOICE, LLC | 612K | CASTLEROCK | AZ |
| 2005-03-11 | 928-667-5XXX | 5000–5999 | Assigned | CSC VOICE, LLC | 612K | PARKER DAM | AZ |
| 2005-03-11 | 928-814-2XXX | 2000–2999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ | 6572 | FLAGSTAFF | AZ |
| 2005-03-08 | 928-444-4XXX | 4000–4999 | Assigned | CSC VOICE, LLC | 612K | BULLHEADCY | AZ |
| 2005-03-08 | 928-575-4XXX | 4000–4999 | Assigned | CSC VOICE, LLC | 612K | PARKER | AZ |
| 2005-03-07 | 928-257-1XXX | 1000–1999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - AZ | 3285 | YUMA | AZ |
| 2005-03-07 | 928-328-1XXX | 1000–1999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - AZ | 3285 | YUMA | AZ |
| 2005-03-07 | 928-328-8XXX | 8000–8999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - AZ | 3285 | YUMA | AZ |
| 2005-03-03 | 928-466-4XXX | 4000–4999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - AZ | 3285 | CASTLEROCK | AZ |
| 2005-03-01 | 928-303-5XXX | 5000–5999 | Assigned | METROPCS, INC. | 5562 | KINGMAN | AZ |
| 2005-03-01 | 928-388-8XXX | 8000–8999 | Assigned | T-MOBILE USA, INC. | 6529 | YUMA | AZ |
| 2005-03-01 | 928-412-7XXX | 7000–7999 | Assigned | T-MOBILE USA, INC. | 6529 | LKHAVASUCY | AZ |
| 2005-02-23 | 928-377-4XXX | 4000–4999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - AZ | 3285 | KINGMAN | AZ |
| 2005-02-18 | 928-230-2XXX | 2000–2999 | Assigned | T-MOBILE USA, INC. | 6529 | LKHAVASUCY | AZ |
| 2005-02-18 | 928-255-0XXX | 0000–0999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - AZ | 3285 | FLAGSTAFF | AZ |
| 2005-02-18 | 928-255-1XXX | 1000–1999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - AZ | 3285 | FLAGSTAFF | AZ |
| 2005-02-18 | 928-388-9XXX | 9000–9999 | Assigned | T-MOBILE USA, INC. | 6529 | YUMA | AZ |
| 2005-02-16 | 928-679-7XXX | 7000–7999 | Assigned | QWEST CORPORATION | 9636 | FLAGSTAFF | AZ |
| 2005-02-16 | 928-679-8XXX | 8000–8999 | Assigned | QWEST CORPORATION | 9636 | FLAGSTAFF | AZ |
| 2005-02-03 | 928-202-5XXX | 5000–5999 | Assigned | T-MOBILE USA, INC. | 6529 | SEDONA | AZ |
| 2005-01-31 | 928-202-3XXX | 3000–3999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - AZ | 3285 | SEDONA | AZ |
| 2005-01-27 | 928-261-3XXX | 3000–3999 | Assigned | T-MOBILE USA, INC. | 6529 | YUMA | AZ |
| 2005-01-27 | 928-261-7XXX | 7000–7999 | Assigned | T-MOBILE USA, INC. | 6529 | YUMA | AZ |
| 2005-01-27 | 928-785-7XXX | 7000–7999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | YUMA | AZ |
| 2005-01-24 | 928-446-7XXX | 7000–7999 | Assigned | T-MOBILE USA, INC. | 6529 | YUMA | AZ |
| 2005-01-20 | 928-415-0XXX | 0000–0999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - AZ | 3285 | WICKENBURG | AZ |
| 2005-01-18 | 928-230-3XXX | 3000–3999 | Assigned | T-MOBILE USA, INC. | 6529 | LKHAVASUCY | AZ |
| 2005-01-18 | 928-303-3XXX | 3000–3999 | Assigned | METROPCS, INC. | 5562 | KINGMAN | AZ |
| 2005-01-17 | 928-257-7XXX | 7000–7999 | Assigned | T-MOBILE USA, INC. | 6529 | YUMA | AZ |
| 2005-01-14 | 928-257-3XXX | 3000–3999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - AZ | 3285 | YUMA | AZ |
| 2005-01-14 | 928-478-8XXX | 8000–8999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - AZ | 3285 | PAYSON | AZ |
| 2005-01-10 | 928-542-5XXX | 5000–5999 | Assigned | T-MOBILE USA, INC. | 6529 | BULLHEADCY | AZ |
| 2004-12-30 | 928-230-4XXX | 4000–4999 | Assigned | T-MOBILE USA, INC. | 6529 | LKHAVASUCY | AZ |
| 2004-12-21 | 928-202-2XXX | 2000–2999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ | 6572 | SEDONA | AZ |
| 2004-12-16 | 928-785-6XXX | 6000–6999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | YUMA | AZ |
| 2004-12-15 | 928-227-0XXX | 0000–0999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - AZ | 3285 | PRESCOTT | AZ |
| 2004-12-15 | 928-227-1XXX | 1000–1999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - AZ | 3285 | PRESCOTT | AZ |
| 2004-12-09 | 928-261-2XXX | 2000–2999 | Assigned | T-MOBILE USA, INC. | 6529 | YUMA | AZ |
| 2004-12-02 | 928-814-1XXX | 1000–1999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | FLAGSTAFF | AZ |
| 2004-11-29 | 928-377-2XXX | 2000–2999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | KINGMAN | AZ |
| 2004-11-18 | 928-252-6XXX | 6000–6999 | Assigned | COMCAST IP PHONE, LLC | 318J | LKPLEASANT | AZ |
| 2004-11-16 | 928-227-2XXX | 2000–2999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - AZ | 3285 | PRESCOTT | AZ |
| 2004-11-16 | 928-261-5XXX | 5000–5999 | Assigned | T-MOBILE USA, INC. | 6529 | YUMA | AZ |
| 2004-10-29 | 928-261-6XXX | 6000–6999 | Assigned | T-MOBILE USA, INC. | 6529 | YUMA | AZ |
| 2004-10-15 | 928-230-5XXX | 5000–5999 | Assigned | T-MOBILE USA, INC. | 6529 | LKHAVASUCY | AZ |
| 2004-10-13 | 928-202-1XXX | 1000–1999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ | 6572 | SEDONA | AZ |
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.