NumberResearchRecent thousands-block assignments
0 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/18/2026
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.
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| Assigned | Block | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|
| 2011-11-30 | 870-455-3XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AR | 7277 | NASHVILLE | AR |
| 2011-11-28 | 870-224-7XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AR | 7277 | MONTICELLO | AR |
| 2011-11-28 | 870-667-3XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AR | 7277 | ASHDOWN | AR |
| 2011-09-12 | 870-474-3XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AR | 7277 | HOPE | AR |
| 2010-10-20 | 870-501-7XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AR | 7277 | MCGEHEE | AR |
| 2010-10-12 | 501-302-3XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AR | 7277 | HEBER SPG | AR |
| 2010-10-12 | 501-485-3XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AR | 7277 | PINNACLE | AR |
| 2010-07-08 | 870-345-3XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AR | 7277 | ARKADLPHIA | AR |
| 2010-06-25 | 870-390-3XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AR | 7277 | CAMDEN | AR |
| 2010-06-25 | 870-626-3XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AR | 7277 | MAGNOLIA | AR |
| 2010-05-25 | 501-203-3XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AR | 7277 | SEARCY | AR |
| 2010-04-05 | 479-268-7XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AR | 7277 | BENTONVL | AR |
| 2010-01-22 | 501-545-2XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AR | 7277 | HOTSPRINGS | AR |
| 2009-11-11 | 501-707-3XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AR | 7277 | LITTLEROCK | AR |
| 2007-10-12 | 501-628-9XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AR | 7277 | CABOT | AR |
| 2007-10-08 | 870-677-3XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AR | 7277 | EL DORADO | AR |
| 2007-04-10 | 479-235-3XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AR | 7277 | VAN BUREN | AR |
| 2007-04-10 | 479-877-3XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AR | 7277 | ROGERS | AR |
| 2007-04-10 | 501-574-3XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AR | 7277 | BENTON | AR |
| 2007-04-10 | 501-764-3XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AR | 7277 | CONWAY | AR |
| 2007-03-22 | 501-943-4XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AR | 7277 | BRYANTCGVL | AR |
| 2007-02-13 | 479-268-2XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AR | 7277 | BENTONVL | AR |
| 2007-02-13 | 501-241-4XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AR | 7277 | JACKSONVL | AR |
| 2006-08-30 | 479-717-5XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AR | 7277 | SPRINGDALE | AR |
| 2005-08-24 | 479-439-6XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AR | 7277 | FAYETTEVL | AR |
| 2005-08-24 | 501-545-4XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AR | 7277 | HOTSPRINGS | AR |
| 2004-03-04 | 479-221-9XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AR | 7277 | FORT SMITH | AR |
| 2003-05-23 | 501-392-3XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AR | 7277 | SYVNHLSHWD | AR |
Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/18/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.