NumberResearchRecent thousands-block assignments
0 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/20/2026
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, all time — NPA 435
New assignments by month
Sep 2026
Aug 2026
Jul 2026
Jun 2026
May 2026
Apr 2026
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Dec 2025
Nov 2025
Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2022-12-15 | 435-309-7XXX | 7000–7999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - UT | 3231 | GLNCNYONCY | UT |
| 2022-12-15 | 435-547-6XXX | 6000–6999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - UT | 3231 | BRIAN HEAD | UT |
| 2022-03-01 | 435-599-7XXX | 7000–7999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - UT | 3231 | ST GEORGE | UT |
| 2020-03-03 | 435-572-8XXX | 8000–8999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - UT | 3231 | CEDAR CITY | UT |
| 2019-06-06 | 435-238-2XXX | 2000–2999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - UT | 3231 | CEDAR CITY | UT |
| 2013-11-27 | 435-602-4XXX | 4000–4999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - UT | 3231 | PARK CITY | UT |
| 2011-09-19 | 435-659-3XXX | 3000–3999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - UT | 3231 | PARK CITY | UT |
| 2011-02-03 | 435-659-2XXX | 2000–2999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - UT | 3231 | PARK CITY | UT |
| 2011-02-02 | 435-562-4XXX | 4000–4999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - UT | 3231 | SALINA | UT |
| 2011-02-02 | 435-710-5XXX | 5000–5999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - UT | 3231 | PAROWAN | UT |
| 2008-10-13 | 435-503-9XXX | 9000–9999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - UT | 3231 | HEBER CITY | UT |
| 2008-04-16 | 435-535-2XXX | 2000–2999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - UT | 3231 | LOGAN | UT |
| 2008-04-16 | 435-938-9XXX | 9000–9999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - UT | 3231 | LOGAN | UT |
| 2008-03-24 | 435-267-0XXX | 0000–0999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - UT | 3231 | CEDAR CITY | UT |
| 2008-03-24 | 435-657-5XXX | 5000–5999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - UT | 3231 | HEBER CITY | UT |
| 2008-02-01 | 435-272-0XXX | 0000–0999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - UT | 3231 | ST GEORGE | UT |
| 2008-02-01 | 435-272-1XXX | 1000–1999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - UT | 3231 | ST GEORGE | UT |
| 2008-01-31 | 435-227-3XXX | 3000–3999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - UT | 3231 | LOGAN | UT |
| 2008-01-31 | 435-227-8XXX | 8000–8999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - UT | 3231 | LOGAN | UT |
| 2008-01-22 | 435-216-9XXX | 9000–9999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - UT | 3231 | ST GEORGE | UT |
| 2008-01-22 | 435-363-2XXX | 2000–2999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - UT | 3231 | LOGAN | UT |
| 2008-01-22 | 435-363-3XXX | 3000–3999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - UT | 3231 | LOGAN | UT |
| 2008-01-17 | 435-216-3XXX | 3000–3999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - UT | 3231 | ST GEORGE | UT |
| 2008-01-16 | 435-227-4XXX | 4000–4999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - UT | 3231 | LOGAN | UT |
| 2006-05-17 | 435-216-1XXX | 1000–1999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - UT | 3231 | ST GEORGE | UT |
| 2005-11-29 | 435-554-0XXX | 0000–0999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - UT | 3231 | LOGAN | UT |
| 2005-11-11 | 435-503-8XXX | 8000–8999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - UT | 3231 | HEBER CITY | UT |
| 2005-10-14 | 435-237-0XXX | 0000–0999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - UT | 3231 | BRIGHAM CY | UT |
| 2005-10-14 | 435-241-5XXX | 5000–5999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - UT | 3231 | TOOELE | UT |
| 2005-08-15 | 435-201-6XXX | 6000–6999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - UT | 3231 | RICHFIELD | UT |
| 2005-08-15 | 435-216-5XXX | 5000–5999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - UT | 3231 | ST GEORGE | UT |
| 2005-08-15 | 435-527-7XXX | 7000–7999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - UT | 3231 | MONROE | UT |
| 2005-08-11 | 435-238-4XXX | 4000–4999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - UT | 3231 | CEDAR CITY | UT |
| 2005-04-22 | 435-201-5XXX | 5000–5999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - UT | 3231 | RICHFIELD | UT |
| 2005-04-22 | 435-252-0XXX | 0000–0999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - UT | 3231 | PARK CITY | UT |
| 2005-02-17 | 435-213-1XXX | 1000–1999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - UT | 3231 | LOGAN | UT |
| 2005-02-11 | 435-215-1XXX | 1000–1999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - UT | 3231 | ST GEORGE | UT |
| 2004-12-13 | 435-214-0XXX | 0000–0999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - UT | 3231 | PARK CITY | UT |
| 2004-10-19 | 435-258-6XXX | 6000–6999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - UT | 3231 | LOGAN | UT |
| 2004-10-19 | 435-772-9XXX | 9000–9999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - UT | 3231 | ST GEORGE | UT |
| 2004-10-07 | 435-915-4XXX | 4000–4999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - UT | 3231 | LOGAN | UT |
| 2004-10-05 | 435-216-4XXX | 4000–4999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - UT | 3231 | ST GEORGE | UT |
| 2004-09-27 | 435-245-1XXX | 1000–1999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - UT | 3231 | LOGAN | UT |
| 2004-09-27 | 435-671-4XXX | 4000–4999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - UT | 3231 | HEBER CITY | UT |
| 2004-05-04 | 435-228-4XXX | 4000–4999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - UT | 3231 | TOOELE | UT |
| 2004-05-04 | 435-261-4XXX | 4000–4999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - UT | 3231 | BEAVER | UT |
| 2004-05-04 | 435-580-4XXX | 4000–4999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - UT | 3231 | NEPHI | UT |
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.