NumberResearchRecent thousands-block assignments
0 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/26/2026
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 928
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 |
|---|---|---|---|---|---|---|---|
| 2009-12-03 | 928-263-3XXX | 3000–3999 | Assigned | CITIZENS UTILITIES RURAL DBA FRONTIER UT RURAL | 2172 | KINGMAN | AZ |
| 2008-08-21 | 928-219-3XXX | 3000–3999 | Assigned | CITIZENS UTILITIES RURAL DBA FRONTIER UT RURAL | 2172 | BULLHEADCY | AZ |
| 2008-08-12 | 928-263-5XXX | 5000–5999 | Assigned | CITIZENS UTILITIES RURAL DBA FRONTIER UT RURAL | 2172 | KINGMAN | AZ |
| 2007-05-09 | 928-263-4XXX | 4000–4999 | Assigned | CITIZENS UTILITIES RURAL DBA FRONTIER UT RURAL | 2172 | KINGMAN | AZ |
| 2007-04-25 | 928-302-5XXX | 5000–5999 | Assigned | CITIZENS UTILITIES RURAL DBA FRONTIER UT RURAL | 2172 | LKHAVASUCY | AZ |
| 2005-05-31 | 928-444-1XXX | 1000–1999 | Assigned | CITIZENS UTILITIES RURAL DBA FRONTIER UT RURAL | 2172 | BULLHEADCY | AZ |
Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/26/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.