NumberResearchRecent thousands-block assignments
0 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/25/2026
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 575
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 |
|---|---|---|---|---|---|---|---|
| 2016-11-10 | 575-205-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NM | 7464 | TUCUMCARI | NM |
| 2016-01-29 | 575-659-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NM | 7464 | LOVINGTON | NM |
| 2015-06-15 | 575-329-4XXX | 4000–4999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NM | 7464 | CANNON AFB | NM |
| 2014-10-27 | 575-288-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NM | 7464 | LAS CRUCES | NM |
| 2013-11-26 | 575-383-8XXX | 8000–8999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NM | 7464 | RATON | NM |
| 2013-02-11 | 575-468-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NM | 7464 | PORTALES | NM |
| 2011-12-01 | 575-936-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NM | 7464 | DEMING | NM |
| 2011-07-12 | 575-502-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NM | 7464 | SNA TERESA | NM |
| 2010-06-29 | 575-519-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NM | 7464 | SILVERCITY | NM |
| 2010-06-29 | 575-616-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NM | 7464 | ARTESIA | NM |
| 2010-01-26 | 575-201-6XXX | 6000–6999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NM | 7464 | ANTHONY | NM |
| 2007-11-21 | 575-322-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NM | 7464 | SOCORRO | NM |
| 2007-10-09 | 575-741-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NM | 7464 | TAOS | NM |
| 2007-03-22 | 575-219-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NM | 7464 | CLOVIS | NM |
| 2006-10-31 | 575-208-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NM | 7464 | ROSWELL | NM |
| 2006-10-31 | 575-551-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NM | 7464 | ALAMOGORDO | NM |
| 2006-10-31 | 575-680-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NM | 7464 | LAS CRUCES | NM |
Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/25/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.