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.
Most active assignees, all time
New assignments by month
Sep 2026
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| Assigned | Block | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|
| 2015-02-09 | 423-491-4XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7278 | JOHNSON CY | TN |
| 2015-02-05 | 423-708-6XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7278 | CHATTNOOGA | TN |
| 2015-01-15 | 615-981-8XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | NASHVILLE | TN |
| 2014-08-25 | 423-592-6XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7278 | LAFOLLETTE | TN |
| 2014-07-10 | 615-928-3XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | NASHVILLE | TN |
| 2014-07-10 | 615-928-4XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | NASHVILLE | TN |
| 2014-03-18 | 865-337-6XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7278 | KNOXVILLE | TN |
| 2014-03-12 | 615-393-5XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | NASHVILLE | TN |
| 2014-03-12 | 615-393-6XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | NASHVILLE | TN |
| 2014-03-12 | 615-393-7XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | NASHVILLE | TN |
| 2014-02-05 | 615-679-3XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | NASHVILLE | TN |
| 2013-12-10 | 615-398-3XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | PLEASANTVW | TN |
| 2013-12-10 | 931-450-7XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | MANCHESTER | TN |
| 2013-10-01 | 931-546-4XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | SOOAKGROVE | TN |
| 2013-09-16 | 615-905-2XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | FRANKLIN | TN |
| 2013-09-16 | 615-905-3XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | FRANKLIN | TN |
| 2013-09-12 | 615-381-0XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | NASHVILLE | TN |
| 2013-09-12 | 615-381-1XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | NASHVILLE | TN |
| 2013-09-12 | 615-381-2XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | NASHVILLE | TN |
| 2013-09-12 | 615-381-8XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | NASHVILLE | TN |
| 2013-09-12 | 615-381-9XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | NASHVILLE | TN |
| 2013-09-03 | 615-381-3XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | NASHVILLE | TN |
| 2013-09-03 | 615-381-4XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | NASHVILLE | TN |
| 2013-09-03 | 615-381-5XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | NASHVILLE | TN |
| 2013-09-03 | 615-381-6XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | NASHVILLE | TN |
| 2013-09-03 | 615-381-7XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | NASHVILLE | TN |
| 2013-08-27 | 615-258-5XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | NASHVILLE | TN |
| 2013-07-29 | 615-241-3XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | NSPRINGHIL | TN |
| 2013-05-14 | 615-647-3XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | NASHVILLE | TN |
| 2013-04-12 | 423-516-5XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7278 | SULIVNGDNS | TN |
| 2013-03-12 | 423-800-7XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7278 | CHATTNOOGA | TN |
| 2013-02-01 | 615-997-2XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | NASHVILLE | TN |
| 2012-09-13 | 615-614-6XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | FRANKLIN | TN |
| 2012-09-13 | 615-614-7XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | FRANKLIN | TN |
| 2012-07-09 | 615-786-8XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | FRANKLIN | TN |
| 2012-04-04 | 615-544-7XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | FAIRVIEW | TN |
| 2012-04-04 | 615-988-3XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | NASHVILLE | TN |
| 2012-03-28 | 615-465-4XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | FRANKLIN | TN |
| 2012-02-10 | 615-617-6XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | MURFREESBO | TN |
| 2012-01-05 | 865-269-7XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7278 | CLINTON | TN |
| 2012-01-04 | 615-486-3XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | CARTHAGE | TN |
| 2012-01-04 | 615-581-3XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | WHITEHOUSE | TN |
| 2011-12-19 | 615-209-7XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | NASHVILLE | TN |
| 2011-11-29 | 423-301-3XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7278 | SO PITTSBG | TN |
| 2011-11-22 | 423-735-6XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7278 | ERWIN | TN |
| 2011-11-22 | 931-295-4XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | HOHENWALD | TN |
| 2011-10-21 | 615-209-2XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | NASHVILLE | TN |
| 2011-10-21 | 615-209-3XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | NASHVILLE | TN |
| 2011-10-21 | 615-209-4XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | NASHVILLE | TN |
| 2011-10-21 | 615-209-5XXX | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | NASHVILLE | 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.