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 520
New assignments by month
Sep 2026
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2026-09-04 | 520-735-7XXX | 7000–7999 | Assigned | INTRADO COMMUNICATIONS, LLC | 890G | SIERRAVIST | AZ |
| 2026-09-04 | 520-765-7XXX | 7000–7999 | Assigned | INTRADO COMMUNICATIONS, LLC | 890G | CASAGRANDE | AZ |
| 2026-08-19 | 520-479-0XXX | 0000–0999 | Assigned | INTRADO COMMUNICATIONS, LLC | 890G | TUCSON | AZ |
| 2026-08-19 | 520-571-5XXX | 5000–5999 | Assigned | INTRADO COMMUNICATIONS, LLC | 890G | TUCSON | AZ |
| 2026-08-19 | 520-594-3XXX | 3000–3999 | Assigned | INTRADO COMMUNICATIONS, LLC | 890G | TUCSON | AZ |
| 2019-10-29 | 520-372-1XXX | 1000–1999 | Assigned | INTRADO COMMUNICATIONS, LLC | 890G | TUCSON | AZ |
| 2019-10-29 | 520-372-9XXX | 9000–9999 | Assigned | INTRADO COMMUNICATIONS, LLC | 890G | TUCSON | AZ |
| 2019-10-29 | 520-416-0XXX | 0000–0999 | Assigned | INTRADO COMMUNICATIONS, LLC | 890G | TUCSON | AZ |
| 2019-10-29 | 520-416-8XXX | 8000–8999 | Assigned | INTRADO COMMUNICATIONS, LLC | 890G | TUCSON | AZ |
| 2019-10-29 | 520-416-9XXX | 9000–9999 | Assigned | INTRADO COMMUNICATIONS, LLC | 890G | TUCSON | AZ |
| 2019-09-25 | 520-372-0XXX | 0000–0999 | Assigned | INTRADO COMMUNICATIONS, LLC | 890G | TUCSON | AZ |
| 2016-07-20 | 520-965-6XXX | 6000–6999 | Assigned | INTRADO COMMUNICATIONS, LLC | 890G | TUCSON | AZ |
| 2014-12-29 | 520-809-9XXX | 9000–9999 | Assigned | INTRADO COMMUNICATIONS, LLC | 890G | TUCSON | 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.