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 559
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 |
|---|---|---|---|---|---|---|---|
| 2014-08-06 | 559-558-9XXX | 9000–9999 | Assigned | LEVEL 3 TELECOM OF CALIFORNIA, LP - CA | 7718 | FRESNO | CA |
| 2013-02-12 | 559-472-4XXX | 4000–4999 | Assigned | LEVEL 3 TELECOM OF CALIFORNIA, LP - CA | 7718 | CLOVIS | CA |
| 2012-09-26 | 559-829-3XXX | 3000–3999 | Assigned | LEVEL 3 TELECOM OF CALIFORNIA, LP - CA | 7718 | SANJOAQUIN | CA |
| 2012-06-25 | 559-573-3XXX | 3000–3999 | Assigned | LEVEL 3 TELECOM OF CALIFORNIA, LP - CA | 7718 | FRESNO | CA |
| 2012-06-13 | 559-316-2XXX | 2000–2999 | Assigned | LEVEL 3 TELECOM OF CALIFORNIA, LP - CA | 7718 | FOWLER | CA |
| 2009-02-25 | 559-492-5XXX | 5000–5999 | Assigned | LEVEL 3 TELECOM OF CALIFORNIA, LP - CA | 7718 | FRESNO | CA |
| 2007-06-14 | 559-389-5XXX | 5000–5999 | Assigned | LEVEL 3 TELECOM OF CALIFORNIA, LP - CA | 7718 | FRESNO | CA |
| 2007-05-30 | 559-408-7XXX | 7000–7999 | Assigned | LEVEL 3 TELECOM OF CALIFORNIA, LP - CA | 7718 | FRESNO | CA |
| 2006-05-17 | 559-892-4XXX | 4000–4999 | Assigned | LEVEL 3 TELECOM OF CALIFORNIA, LP - CA | 7718 | FRESNO | CA |
| 2005-09-06 | 559-892-2XXX | 2000–2999 | Assigned | LEVEL 3 TELECOM OF CALIFORNIA, LP - CA | 7718 | FRESNO | CA |
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.