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 |
|---|---|---|---|---|---|
| 2026-04-14 | 479-590-3XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AR | 7277 | FORT SMITH | AR |
| 2025-01-09 | 479-554-9XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AR | 7277 | FORT SMITH | AR |
| 2022-04-18 | 501-401-6XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AR | 7277 | LITTLEROCK | AR |
| 2019-07-01 | 479-362-0XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AR | 7277 | BENTONVL | AR |
| 2019-07-01 | 479-362-1XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AR | 7277 | BENTONVL | AR |
| 2019-07-01 | 479-362-2XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AR | 7277 | BENTONVL | AR |
| 2019-07-01 | 479-362-3XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AR | 7277 | BENTONVL | AR |
| 2019-07-01 | 479-362-4XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AR | 7277 | BENTONVL | AR |
| 2019-04-10 | 501-355-3XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AR | 7277 | LITTLEROCK | AR |
| 2019-04-10 | 501-355-4XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AR | 7277 | LITTLEROCK | AR |
| 2019-04-10 | 501-355-5XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AR | 7277 | LITTLEROCK | AR |
| 2018-02-08 | 501-263-3XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AR | 7277 | LITTLEROCK | AR |
| 2017-11-06 | 479-769-3XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AR | 7277 | FORT SMITH | AR |
| 2017-05-01 | 479-319-5XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AR | 7277 | BENTONVL | AR |
| 2017-04-26 | 501-904-3XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AR | 7277 | LITTLEROCK | AR |
| 2017-04-10 | 479-367-3XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AR | 7277 | BENTONVL | AR |
| 2017-02-03 | 479-347-3XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AR | 7277 | SPRINGDALE | AR |
| 2017-02-03 | 870-444-3XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AR | 7277 | EL DORADO | AR |
| 2017-01-17 | 501-261-3XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AR | 7277 | SPRINGLAKE | AR |
| 2016-09-13 | 501-478-2XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AR | 7277 | LITTLEROCK | AR |
| 2016-08-24 | 479-431-3XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AR | 7277 | FORT SMITH | AR |
| 2016-07-05 | 501-585-4XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AR | 7277 | CONWAY | AR |
| 2016-06-15 | 870-417-3XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AR | 7277 | LAKE VLG | AR |
| 2016-06-15 | 870-831-3XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AR | 7277 | HAMBURG | AR |
| 2016-04-22 | 501-651-2XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AR | 7277 | HOTSPRINGS | AR |
| 2016-02-16 | 870-466-3XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AR | 7277 | WARREN | AR |
| 2016-01-27 | 479-437-6XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AR | 7277 | MENA | AR |
| 2015-10-21 | 501-575-3XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AR | 7277 | BENTON | AR |
| 2015-05-11 | 870-727-6XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AR | 7277 | PINE BLUFF | AR |
| 2015-04-03 | 479-321-3XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AR | 7277 | BENTONVL | AR |
| 2015-02-04 | 501-777-3XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AR | 7277 | LITTLEROCK | AR |
| 2015-02-02 | 479-877-7XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AR | 7277 | ROGERS | AR |
| 2015-02-02 | 501-505-4XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AR | 7277 | CONWAY | AR |
| 2014-04-22 | 479-718-6XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AR | 7277 | FAYETTEVL | AR |
| 2014-04-17 | 501-725-7XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AR | 7277 | LITTLEROCK | AR |
| 2013-12-13 | 501-204-3XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AR | 7277 | JESSIEVL | AR |
| 2013-11-08 | 501-825-3XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AR | 7277 | GREERSFRRY | AR |
| 2013-11-08 | 870-724-3XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AR | 7277 | GURDON | AR |
| 2013-10-15 | 479-877-2XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AR | 7277 | ROGERS | AR |
| 2013-10-01 | 501-725-3XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AR | 7277 | LITTLEROCK | AR |
| 2013-09-12 | 479-802-5XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AR | 7277 | BENTONVL | AR |
| 2013-02-25 | 479-259-9XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AR | 7277 | FORT SMITH | AR |
| 2013-02-05 | 501-267-4XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AR | 7277 | MALVERN | AR |
| 2012-12-07 | 501-482-3XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AR | 7277 | FERNDALE | AR |
| 2012-08-28 | 479-573-3XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AR | 7277 | FORT SMITH | AR |
| 2012-08-01 | 501-954-6XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AR | 7277 | LITTLEROCK | AR |
| 2012-04-05 | 479-717-7XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AR | 7277 | SPRINGDALE | AR |
| 2011-11-30 | 501-237-3XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AR | 7277 | LONOKE | AR |
| 2011-11-30 | 501-483-4XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AR | 7277 | PALARM | AR |
| 2011-11-30 | 501-727-3XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AR | 7277 | MORRILTON | 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.