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
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2018-08-21 | 435-253-8XXX | 8000–8999 | Assigned | FIRSTDIGITAL TELECOM, LLC - UT | 5727 | FILLMORE | UT |
| 2017-12-11 | 435-485-1XXX | 1000–1999 | Assigned | FIRSTDIGITAL TELECOM, LLC - UT | 5727 | BLANDING | UT |
| 2017-12-05 | 435-419-9XXX | 9000–9999 | Assigned | FIRSTDIGITAL TELECOM, LLC - UT | 5727 | MONTICELLO | UT |
| 2015-08-04 | 435-429-7XXX | 7000–7999 | Assigned | FIRSTDIGITAL TELECOM, LLC - UT | 5727 | ST GEORGE | UT |
| 2014-12-19 | 435-406-0XXX | 0000–0999 | Assigned | FIRSTDIGITAL TELECOM, LLC - UT | 5727 | DELTA | UT |
| 2014-12-19 | 435-406-8XXX | 8000–8999 | Assigned | FIRSTDIGITAL TELECOM, LLC - UT | 5727 | DELTA | UT |
| 2014-10-24 | 435-383-9XXX | 9000–9999 | Assigned | FIRSTDIGITAL TELECOM, LLC - UT | 5727 | CEDAR CITY | UT |
| 2014-10-21 | 435-670-1XXX | 1000–1999 | Assigned | FIRSTDIGITAL TELECOM, LLC - UT | 5727 | SALINA | UT |
| 2014-09-29 | 435-619-8XXX | 8000–8999 | Assigned | FIRSTDIGITAL TELECOM, LLC - UT | 5727 | ST GEORGE | UT |
| 2014-09-29 | 435-703-2XXX | 2000–2999 | Assigned | FIRSTDIGITAL TELECOM, LLC - UT | 5727 | ST GEORGE | UT |
| 2011-12-28 | 435-200-2XXX | 2000–2999 | Assigned | FIRSTDIGITAL TELECOM, LLC - UT | 5727 | PARK CITY | UT |
| 2011-12-27 | 435-631-3XXX | 3000–3999 | Assigned | FIRSTDIGITAL TELECOM, LLC - UT | 5727 | PARK CITY | UT |
| 2011-12-27 | 435-631-8XXX | 8000–8999 | Assigned | FIRSTDIGITAL TELECOM, LLC - UT | 5727 | PARK CITY | UT |
| 2011-12-27 | 435-714-5XXX | 5000–5999 | Assigned | FIRSTDIGITAL TELECOM, LLC - UT | 5727 | PARK CITY | UT |
| 2011-12-27 | 435-729-1XXX | 1000–1999 | Assigned | FIRSTDIGITAL TELECOM, LLC - UT | 5727 | PARK CITY | UT |
| 2011-12-27 | 435-729-2XXX | 2000–2999 | Assigned | FIRSTDIGITAL TELECOM, LLC - UT | 5727 | PARK CITY | UT |
| 2011-12-27 | 435-729-3XXX | 3000–3999 | Assigned | FIRSTDIGITAL TELECOM, LLC - UT | 5727 | PARK CITY | UT |
| 2011-12-27 | 435-729-4XXX | 4000–4999 | Assigned | FIRSTDIGITAL TELECOM, LLC - UT | 5727 | PARK CITY | UT |
| 2011-12-27 | 435-729-5XXX | 5000–5999 | Assigned | FIRSTDIGITAL TELECOM, LLC - UT | 5727 | PARK CITY | UT |
| 2011-12-27 | 435-729-6XXX | 6000–6999 | Assigned | FIRSTDIGITAL TELECOM, LLC - UT | 5727 | PARK CITY | UT |
| 2011-12-27 | 435-729-8XXX | 8000–8999 | Assigned | FIRSTDIGITAL TELECOM, LLC - UT | 5727 | PARK CITY | UT |
| 2011-07-08 | 435-215-0XXX | 0000–0999 | Assigned | FIRSTDIGITAL TELECOM, LLC - UT | 5727 | ST GEORGE | UT |
| 2011-07-08 | 435-919-1XXX | 1000–1999 | Assigned | FIRSTDIGITAL TELECOM, LLC - UT | 5727 | BRIGHAM CY | UT |
| 2009-01-23 | 435-856-1XXX | 1000–1999 | Assigned | FIRSTDIGITAL TELECOM, LLC - UT | 5727 | NEPHI | UT |
| 2006-07-10 | 435-657-8XXX | 8000–8999 | Assigned | FIRSTDIGITAL TELECOM, LLC - UT | 5727 | HEBER CITY | 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.