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 |
|---|---|---|---|---|---|
| 2011-10-21 | 615-209-6XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | NASHVILLE | TN |
| 2011-09-28 | 615-953-5XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | NASHVILLE | TN |
| 2011-09-02 | 615-984-3XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | SMYRNA | TN |
| 2011-07-05 | 423-241-4XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7278 | COPPERBSIN | TN |
| 2011-07-05 | 423-436-3XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7278 | MADISONVL | TN |
| 2011-07-05 | 423-781-3XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7278 | ETOWAH | TN |
| 2011-07-05 | 865-344-3XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7278 | DANDRIDGE | TN |
| 2011-07-05 | 865-375-3XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7278 | JEFFERSNCY | TN |
| 2011-06-29 | 931-499-3XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | SPRINGHILL | TN |
| 2011-05-31 | 615-984-5XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | SMYRNA | TN |
| 2011-05-24 | 615-807-7XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | FRANKLIN | TN |
| 2011-04-19 | 615-807-5XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | FRANKLIN | TN |
| 2011-04-19 | 615-807-6XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | FRANKLIN | TN |
| 2011-04-15 | 615-970-3XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | NASHVILLE | TN |
| 2011-02-23 | 615-798-1XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | FRANKLIN | TN |
| 2011-02-23 | 615-798-5XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | FRANKLIN | TN |
| 2011-02-23 | 615-798-6XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | FRANKLIN | TN |
| 2011-02-23 | 615-798-7XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | FRANKLIN | TN |
| 2011-01-18 | 423-414-3XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7278 | CHATTNOOGA | TN |
| 2010-12-29 | 931-279-5XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | LAWRENCEBG | TN |
| 2010-12-29 | 931-371-3XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | PULASKI | TN |
| 2010-12-29 | 931-557-3XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | FAYETTEVL | TN |
| 2010-11-19 | 423-381-6XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7278 | ATHENS | TN |
| 2010-10-04 | 865-238-7XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7278 | MARYVILLE | TN |
| 2010-08-17 | 615-861-6XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | FRANKLIN | TN |
| 2010-08-17 | 615-861-7XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | FRANKLIN | TN |
| 2010-08-10 | 615-970-5XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | NASHVILLE | TN |
| 2010-08-09 | 615-970-4XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | NASHVILLE | TN |
| 2010-05-25 | 423-707-3XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7278 | ELIZABTHTN | TN |
| 2010-05-21 | 615-208-8XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | NASHVILLE | TN |
| 2010-04-15 | 615-925-4XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | NASHVILLE | TN |
| 2010-02-10 | 423-406-3XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7278 | MIDWAY SUL | TN |
| 2010-01-12 | 931-264-3XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | WAVERLY | TN |
| 2009-12-14 | 423-347-3XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7278 | ROGERSVL | TN |
| 2009-11-17 | 615-679-4XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | NASHVILLE | TN |
| 2009-09-28 | 615-925-3XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | NASHVILLE | TN |
| 2009-09-22 | 615-861-5XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | FRANKLIN | TN |
| 2009-05-29 | 615-779-5XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | NASHVILLE | TN |
| 2009-05-29 | 615-779-7XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | NASHVILLE | TN |
| 2009-05-29 | 615-873-5XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | NASHVILLE | TN |
| 2009-02-10 | 423-391-4XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7278 | BLUFF CITY | TN |
| 2009-02-10 | 423-948-4XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7278 | LIMESTONE | TN |
| 2009-02-10 | 865-465-4XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7278 | MASCOT | TN |
| 2009-02-10 | 865-657-4XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7278 | LOUDON | TN |
| 2008-11-28 | 615-873-2XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | NASHVILLE | TN |
| 2008-11-28 | 615-873-3XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | NASHVILLE | TN |
| 2008-09-30 | 423-662-3XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7278 | BLOUNTVL | TN |
| 2008-09-30 | 865-325-3XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7278 | GATLINBURG | TN |
| 2008-09-08 | 615-861-3XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | FRANKLIN | TN |
| 2008-09-08 | 615-861-4XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | FRANKLIN | TN |
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.