NumberResearchRecent thousands-block assignments
2 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 623
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 |
|---|---|---|---|---|---|---|---|
| 2022-04-22 | 623-276-5XXX | 5000–5999 | Assigned | T-MOBILE USA, INC. | 6529 | PHOENIX | AZ |
| 2022-04-22 | 623-276-6XXX | 6000–6999 | Assigned | T-MOBILE USA, INC. | 6529 | PHOENIX | AZ |
| 2022-04-22 | 623-276-7XXX | 7000–7999 | Assigned | T-MOBILE USA, INC. | 6529 | PHOENIX | AZ |
| 2022-04-22 | 623-276-8XXX | 8000–8999 | Assigned | T-MOBILE USA, INC. | 6529 | PHOENIX | AZ |
| 2022-04-22 | 623-276-9XXX | 9000–9999 | Assigned | T-MOBILE USA, INC. | 6529 | PHOENIX | AZ |
| 2022-04-20 | 623-283-0XXX | 0000–0999 | Assigned | T-MOBILE USA, INC. | 6529 | PHOENIX | AZ |
| 2022-04-20 | 623-283-8XXX | 8000–8999 | Assigned | T-MOBILE USA, INC. | 6529 | PHOENIX | AZ |
| 2022-04-20 | 623-283-9XXX | 9000–9999 | Assigned | T-MOBILE USA, INC. | 6529 | PHOENIX | AZ |
| 2022-04-19 | 623-283-6XXX | 6000–6999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - AZ | 3285 | PHOENIX | AZ |
| 2022-04-11 | 623-283-1XXX | 1000–1999 | Assigned | ONVOY, LLC - AZ | 630E | PHOENIX | AZ |
| 2022-04-11 | 623-283-2XXX | 2000–2999 | Assigned | ONVOY, LLC - AZ | 630E | PHOENIX | AZ |
| 2022-04-11 | 623-283-3XXX | 3000–3999 | Assigned | ONVOY, LLC - AZ | 630E | PHOENIX | AZ |
| 2022-04-11 | 623-283-4XXX | 4000–4999 | Assigned | ONVOY, LLC - AZ | 630E | PHOENIX | AZ |
| 2022-04-11 | 623-283-5XXX | 5000–5999 | Assigned | ONVOY, LLC - AZ | 630E | PHOENIX | AZ |
| 2022-03-29 | 623-284-2XXX | 2000–2999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - AZ | 3285 | PHOENIX | AZ |
| 2022-03-23 | 623-284-0XXX | 0000–0999 | Assigned | TELNYX LLC | 073H | PHOENIX | AZ |
| 2022-03-23 | 623-284-1XXX | 1000–1999 | Assigned | TELNYX LLC | 073H | PHOENIX | AZ |
| 2022-02-22 | 623-284-4XXX | 4000–4999 | Assigned | T-MOBILE USA, INC. | 6529 | PHOENIX | AZ |
| 2022-02-22 | 623-284-5XXX | 5000–5999 | Assigned | T-MOBILE USA, INC. | 6529 | PHOENIX | AZ |
| 2022-02-22 | 623-284-6XXX | 6000–6999 | Assigned | T-MOBILE USA, INC. | 6529 | PHOENIX | AZ |
| 2022-02-22 | 623-284-7XXX | 7000–7999 | Assigned | T-MOBILE USA, INC. | 6529 | PHOENIX | AZ |
| 2022-02-22 | 623-284-8XXX | 8000–8999 | Assigned | T-MOBILE USA, INC. | 6529 | PHOENIX | AZ |
| 2022-02-22 | 623-284-9XXX | 9000–9999 | Assigned | T-MOBILE USA, INC. | 6529 | PHOENIX | AZ |
| 2022-02-22 | 623-288-0XXX | 0000–0999 | Assigned | ONVOY, LLC - AZ | 630E | PHOENIX | AZ |
| 2022-02-22 | 623-288-1XXX | 1000–1999 | Assigned | ONVOY, LLC - AZ | 630E | PHOENIX | AZ |
| 2022-02-22 | 623-288-2XXX | 2000–2999 | Assigned | ONVOY, LLC - AZ | 630E | PHOENIX | AZ |
| 2022-02-22 | 623-288-3XXX | 3000–3999 | Assigned | ONVOY, LLC - AZ | 630E | PHOENIX | AZ |
| 2022-02-22 | 623-288-4XXX | 4000–4999 | Assigned | ONVOY, LLC - AZ | 630E | PHOENIX | AZ |
| 2022-02-22 | 623-288-5XXX | 5000–5999 | Assigned | ONVOY, LLC - AZ | 630E | PHOENIX | AZ |
| 2022-02-22 | 623-288-6XXX | 6000–6999 | Assigned | ONVOY, LLC - AZ | 630E | PHOENIX | AZ |
| 2022-02-22 | 623-288-7XXX | 7000–7999 | Assigned | ONVOY, LLC - AZ | 630E | PHOENIX | AZ |
| 2022-02-22 | 623-288-8XXX | 8000–8999 | Assigned | ONVOY, LLC - AZ | 630E | PHOENIX | AZ |
| 2022-02-22 | 623-288-9XXX | 9000–9999 | Assigned | ONVOY, LLC - AZ | 630E | PHOENIX | AZ |
| 2022-02-18 | 623-281-0XXX | 0000–0999 | Assigned | ONVOY, LLC - AZ | 630E | PHOENIX | AZ |
| 2022-02-18 | 623-281-1XXX | 1000–1999 | Assigned | ONVOY, LLC - AZ | 630E | PHOENIX | AZ |
| 2022-02-18 | 623-281-2XXX | 2000–2999 | Assigned | ONVOY, LLC - AZ | 630E | PHOENIX | AZ |
| 2022-02-18 | 623-281-3XXX | 3000–3999 | Assigned | ONVOY, LLC - AZ | 630E | PHOENIX | AZ |
| 2022-01-13 | 623-281-4XXX | 4000–4999 | Assigned | T-MOBILE USA, INC. | 6529 | PHOENIX | AZ |
| 2022-01-13 | 623-281-5XXX | 5000–5999 | Assigned | T-MOBILE USA, INC. | 6529 | PHOENIX | AZ |
| 2022-01-13 | 623-281-6XXX | 6000–6999 | Assigned | T-MOBILE USA, INC. | 6529 | PHOENIX | AZ |
| 2022-01-13 | 623-281-7XXX | 7000–7999 | Assigned | T-MOBILE USA, INC. | 6529 | PHOENIX | AZ |
| 2022-01-13 | 623-281-8XXX | 8000–8999 | Assigned | T-MOBILE USA, INC. | 6529 | PHOENIX | AZ |
| 2022-01-13 | 623-281-9XXX | 9000–9999 | Assigned | T-MOBILE USA, INC. | 6529 | PHOENIX | AZ |
| 2022-01-11 | 623-268-0XXX | 0000–0999 | Assigned | T-MOBILE USA, INC. | 6529 | PHOENIX | AZ |
| 2022-01-11 | 623-268-1XXX | 1000–1999 | Assigned | T-MOBILE USA, INC. | 6529 | PHOENIX | AZ |
| 2022-01-11 | 623-268-2XXX | 2000–2999 | Assigned | T-MOBILE USA, INC. | 6529 | PHOENIX | AZ |
| 2022-01-11 | 623-268-3XXX | 3000–3999 | Assigned | T-MOBILE USA, INC. | 6529 | PHOENIX | AZ |
| 2022-01-08 | 623-280-0XXX | 0000–0999 | Assigned | ONVOY, LLC - AZ | 630E | PHOENIX | AZ |
| 2022-01-08 | 623-280-1XXX | 1000–1999 | Assigned | ONVOY, LLC - AZ | 630E | PHOENIX | AZ |
| 2022-01-08 | 623-280-2XXX | 2000–2999 | Assigned | ONVOY, LLC - AZ | 630E | PHOENIX | 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.