NumberResearchRecent thousands-block assignments
0 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/23/2026
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 951
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 |
|---|---|---|---|---|---|---|---|
| 2009-01-14 | 951-251-6XXX | 6000–6999 | Assigned | FRONTIER CALIFORNIA INC. | 2319 | MORENO | CA |
| 2009-01-14 | 951-251-7XXX | 7000–7999 | Assigned | FRONTIER CALIFORNIA INC. | 2319 | MORENO | CA |
| 2008-11-11 | 951-249-8XXX | 8000–8999 | Assigned | FRONTIER CALIFORNIA INC. | 2319 | MURRIETA | CA |
| 2008-01-15 | 951-238-3XXX | 3000–3999 | Assigned | FRONTIER CALIFORNIA INC. | 2319 | PERRIS | CA |
| 2007-02-15 | 951-223-2XXX | 2000–2999 | Assigned | FRONTIER CALIFORNIA INC. | 2319 | HEMT HMLD | CA |
| 2006-09-01 | 951-723-1XXX | 1000–1999 | Assigned | FRONTIER CALIFORNIA INC. | 2319 | SUN CITY | CA |
| 2006-08-23 | 951-240-4XXX | 4000–4999 | Assigned | FRONTIER CALIFORNIA INC. | 2319 | TEMECULA | CA |
| 2006-07-19 | 951-691-5XXX | 5000–5999 | Assigned | FRONTIER CALIFORNIA INC. | 2319 | MURRIETA | CA |
| 2006-03-13 | 951-246-8XXX | 8000–8999 | Assigned | FRONTIER CALIFORNIA INC. | 2319 | SUN CITY | CA |
| 2005-08-02 | 951-867-3XXX | 3000–3999 | Assigned | FRONTIER CALIFORNIA INC. | 2319 | MORENO | CA |
| 2005-07-26 | 951-816-3XXX | 3000–3999 | Assigned | FRONTIER CALIFORNIA INC. | 2319 | MURRIETA | CA |
| 2005-05-23 | 951-639-5XXX | 5000–5999 | Assigned | FRONTIER CALIFORNIA INC. | 2319 | SUN CITY | CA |
| 2005-05-13 | 951-490-4XXX | 4000–4999 | Assigned | FRONTIER CALIFORNIA INC. | 2319 | PERRIS | CA |
| 2005-05-04 | 951-445-4XXX | 4000–4999 | Assigned | FRONTIER CALIFORNIA INC. | 2319 | MURRIETA | CA |
| 2005-04-27 | 951-487-3XXX | 3000–3999 | Assigned | FRONTIER CALIFORNIA INC. | 2319 | HEMT SNJC | CA |
| 2005-03-03 | 951-325-2XXX | 2000–2999 | Assigned | FRONTIER CALIFORNIA INC. | 2319 | HEMT HMLD | CA |
| 2005-02-16 | 951-723-8XXX | 8000–8999 | Assigned | FRONTIER CALIFORNIA INC. | 2319 | SUN CITY | CA |
| 2005-01-19 | 951-922-6XXX | 6000–6999 | Assigned | FRONTIER CALIFORNIA INC. | 2319 | BANNING | CA |
| 2004-10-26 | 951-566-5XXX | 5000–5999 | Assigned | FRONTIER CALIFORNIA INC. | 2319 | SUN CITY | CA |
| 2004-10-26 | 951-813-3XXX | 3000–3999 | Assigned | FRONTIER CALIFORNIA INC. | 2319 | MURRIETA | CA |
| 2004-09-23 | 951-922-4XXX | 4000–4999 | Assigned | FRONTIER CALIFORNIA INC. | 2319 | BANNING | CA |
| 2004-09-14 | 951-325-5XXX | 5000–5999 | Assigned | FRONTIER CALIFORNIA INC. | 2319 | HEMT HMLD | CA |
| 2004-05-17 | 951-769-5XXX | 5000–5999 | Assigned | FRONTIER CALIFORNIA INC. | 2319 | BANNING | CA |
| 2004-02-17 | 951-769-4XXX | 4000–4999 | Assigned | FRONTIER CALIFORNIA INC. | 2319 | BANNING | CA |
| 2004-01-15 | 951-246-4XXX | 4000–4999 | Assigned | FRONTIER CALIFORNIA INC. | 2319 | SUN CITY | CA |
| 2004-01-15 | 951-325-7XXX | 7000–7999 | Assigned | FRONTIER CALIFORNIA INC. | 2319 | HEMT HMLD | CA |
| 2003-09-15 | 951-325-8XXX | 8000–8999 | Assigned | FRONTIER CALIFORNIA INC. | 2319 | HEMT HMLD | CA |
| 2003-09-02 | 951-894-2XXX | 2000–2999 | Assigned | FRONTIER CALIFORNIA INC. | 2319 | MURRIETA | CA |
| 2003-08-29 | 951-246-7XXX | 7000–7999 | Assigned | FRONTIER CALIFORNIA INC. | 2319 | SUN CITY | CA |
| 2003-07-17 | 951-894-1XXX | 1000–1999 | Assigned | FRONTIER CALIFORNIA INC. | 2319 | MURRIETA | CA |
| 2003-05-12 | 951-894-4XXX | 4000–4999 | Assigned | FRONTIER CALIFORNIA INC. | 2319 | MURRIETA | CA |
| 2003-05-06 | 951-246-3XXX | 3000–3999 | Assigned | FRONTIER CALIFORNIA INC. | 2319 | SUN CITY | CA |
| 2003-03-04 | 951-894-6XXX | 6000–6999 | Assigned | FRONTIER CALIFORNIA INC. | 2319 | MURRIETA | CA |
| 2002-12-19 | 951-894-5XXX | 5000–5999 | Assigned | FRONTIER CALIFORNIA INC. | 2319 | MURRIETA | CA |
| 2002-11-13 | 951-894-7XXX | 7000–7999 | Assigned | FRONTIER CALIFORNIA INC. | 2319 | MURRIETA | CA |
| 2002-09-18 | 951-304-7XXX | 7000–7999 | Assigned | FRONTIER CALIFORNIA INC. | 2319 | MURRIETA | CA |
| 2002-07-11 | 951-304-3XXX | 3000–3999 | Assigned | FRONTIER CALIFORNIA INC. | 2319 | MURRIETA | CA |
| 2002-05-01 | 951-304-2XXX | 2000–2999 | Assigned | FRONTIER CALIFORNIA INC. | 2319 | MURRIETA | CA |
| 2002-02-12 | 951-304-9XXX | 9000–9999 | Assigned | FRONTIER CALIFORNIA INC. | 2319 | MURRIETA | CA |
| 2001-12-21 | 951-461-8XXX | 8000–8999 | Assigned | FRONTIER CALIFORNIA INC. | 2319 | MURRIETA | CA |
| 2001-11-07 | 951-461-7XXX | 7000–7999 | Assigned | FRONTIER CALIFORNIA INC. | 2319 | MURRIETA | CA |
| 2001-09-21 | 951-461-4XXX | 4000–4999 | Assigned | FRONTIER CALIFORNIA INC. | 2319 | MURRIETA | CA |
Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/23/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.