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 870
New assignments by month
Sep 2026
Aug 2026
Jul 2026
Jun 2026
May 2026
Apr 2026
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Dec 2025
Nov 2025
Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2019-04-17 | 870-666-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | JONESBORO | AR |
| 2017-02-03 | 870-444-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AR | 7277 | EL DORADO | AR |
| 2016-10-05 | 870-201-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | NEWPORT | AR |
| 2016-06-15 | 870-271-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | HARRISBURG | AR |
| 2016-06-15 | 870-298-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | MARIANNA | AR |
| 2016-06-15 | 870-301-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | AUGUSTA | AR |
| 2016-06-15 | 870-417-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AR | 7277 | LAKE VLG | AR |
| 2016-06-15 | 870-753-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | HELENA | AR |
| 2016-06-15 | 870-831-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AR | 7277 | HAMBURG | AR |
| 2016-02-16 | 870-466-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AR | 7277 | WARREN | AR |
| 2015-05-11 | 870-727-6XXX | 6000–6999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AR | 7277 | PINE BLUFF | AR |
| 2015-02-02 | 870-581-5XXX | 5000–5999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | FORREST CY | AR |
| 2014-11-17 | 870-581-4XXX | 4000–4999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | FORREST CY | AR |
| 2014-05-14 | 870-945-4XXX | 4000–4999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | FORREST CY | AR |
| 2014-03-19 | 870-376-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | BATESVILLE | AR |
| 2014-03-03 | 870-819-4XXX | 4000–4999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | JONESBORO | AR |
| 2013-11-08 | 870-724-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AR | 7277 | GURDON | AR |
| 2013-11-08 | 870-945-8XXX | 8000–8999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | FORREST CY | AR |
| 2013-06-14 | 870-581-8XXX | 8000–8999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | FORREST CY | AR |
| 2011-11-30 | 870-455-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AR | 7277 | NASHVILLE | AR |
| 2011-11-28 | 870-224-7XXX | 7000–7999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AR | 7277 | MONTICELLO | AR |
| 2011-11-28 | 870-587-7XXX | 7000–7999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | WYNNE | AR |
| 2011-11-28 | 870-667-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AR | 7277 | ASHDOWN | AR |
| 2011-09-23 | 870-759-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | WALNUT RDG | AR |
| 2011-09-12 | 870-474-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AR | 7277 | HOPE | AR |
| 2011-08-11 | 870-878-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | BLACK ROCK | AR |
| 2011-02-24 | 870-576-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | OSCEOLA | AR |
| 2010-10-20 | 870-501-7XXX | 7000–7999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AR | 7277 | MCGEHEE | AR |
| 2010-07-09 | 870-824-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | BLYTHEVL | AR |
| 2010-07-08 | 870-345-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AR | 7277 | ARKADLPHIA | AR |
| 2010-06-25 | 870-390-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AR | 7277 | CAMDEN | AR |
| 2010-06-25 | 870-626-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AR | 7277 | MAGNOLIA | AR |
| 2009-08-26 | 870-594-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | FORREST CY | AR |
| 2008-03-18 | 870-648-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | TEXARKANA | AR |
| 2007-10-08 | 870-677-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AR | 7277 | EL DORADO | AR |
| 2007-03-15 | 870-573-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | PARAGOULD | AR |
| 2007-02-22 | 870-330-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | TEXARKANA | AR |
| 2006-05-18 | 870-819-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | JONESBORO | AR |
| 2004-11-19 | 870-559-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | MARION | AR |
| 2004-09-29 | 870-629-9XXX | 9000–9999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | W MEMPHIS | AR |
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.