NumberResearchRecent thousands-block assignments
0 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/19/2026
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 615
New assignments by month
Sep 2026
Aug 2026
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Jun 2026
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2023-02-22 | 615-954-0XXX | 0000–0999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | NASHVILLE | TN |
| 2023-02-22 | 615-954-1XXX | 1000–1999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | NASHVILLE | TN |
| 2023-02-22 | 615-954-2XXX | 2000–2999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | NASHVILLE | TN |
| 2023-02-22 | 615-954-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | NASHVILLE | TN |
| 2023-02-22 | 615-954-4XXX | 4000–4999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | NASHVILLE | TN |
| 2023-02-22 | 615-954-5XXX | 5000–5999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | NASHVILLE | TN |
| 2023-02-22 | 615-954-6XXX | 6000–6999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | NASHVILLE | TN |
| 2023-02-22 | 615-954-7XXX | 7000–7999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | NASHVILLE | TN |
| 2023-02-22 | 615-954-8XXX | 8000–8999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | NASHVILLE | TN |
| 2023-02-22 | 615-954-9XXX | 9000–9999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | NASHVILLE | TN |
| 2021-03-11 | 615-989-5XXX | 5000–5999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | GALLATIN | TN |
| 2020-08-05 | 615-882-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | NASHVILLE | TN |
| 2020-08-04 | 615-984-6XXX | 6000–6999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | SMYRNA | TN |
| 2018-07-26 | 615-235-8XXX | 8000–8999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | LEBANON | TN |
| 2017-04-24 | 615-757-8XXX | 8000–8999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | HENDERSNVL | TN |
| 2016-08-22 | 615-657-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | ASHLAND CY | TN |
| 2016-06-13 | 615-716-7XXX | 7000–7999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | FRANKLIN | TN |
| 2016-04-28 | 615-600-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | NASHVILLE | TN |
| 2015-10-23 | 615-571-8XXX | 8000–8999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | NASHVILLE | TN |
| 2015-05-13 | 615-919-5XXX | 5000–5999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | NASHVILLE | TN |
| 2015-05-13 | 615-928-5XXX | 5000–5999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | NASHVILLE | TN |
| 2015-04-13 | 615-648-8XXX | 8000–8999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | MURFREESBO | TN |
| 2015-03-31 | 615-721-0XXX | 0000–0999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | FRANKLIN | TN |
| 2015-03-31 | 615-721-1XXX | 1000–1999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | FRANKLIN | TN |
| 2015-03-18 | 615-721-4XXX | 4000–4999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | FRANKLIN | TN |
| 2015-01-15 | 615-981-8XXX | 8000–8999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | NASHVILLE | TN |
| 2014-07-10 | 615-928-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | NASHVILLE | TN |
| 2014-07-10 | 615-928-4XXX | 4000–4999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | NASHVILLE | TN |
| 2014-03-12 | 615-393-5XXX | 5000–5999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | NASHVILLE | TN |
| 2014-03-12 | 615-393-6XXX | 6000–6999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | NASHVILLE | TN |
| 2014-03-12 | 615-393-7XXX | 7000–7999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | NASHVILLE | TN |
| 2014-02-05 | 615-679-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | NASHVILLE | TN |
| 2013-12-10 | 615-398-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | PLEASANTVW | TN |
| 2013-09-16 | 615-905-2XXX | 2000–2999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | FRANKLIN | TN |
| 2013-09-16 | 615-905-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | FRANKLIN | TN |
| 2013-09-12 | 615-381-0XXX | 0000–0999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | NASHVILLE | TN |
| 2013-09-12 | 615-381-1XXX | 1000–1999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | NASHVILLE | TN |
| 2013-09-12 | 615-381-2XXX | 2000–2999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | NASHVILLE | TN |
| 2013-09-12 | 615-381-8XXX | 8000–8999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | NASHVILLE | TN |
| 2013-09-12 | 615-381-9XXX | 9000–9999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | NASHVILLE | TN |
| 2013-09-03 | 615-381-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | NASHVILLE | TN |
| 2013-09-03 | 615-381-4XXX | 4000–4999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | NASHVILLE | TN |
| 2013-09-03 | 615-381-5XXX | 5000–5999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | NASHVILLE | TN |
| 2013-09-03 | 615-381-6XXX | 6000–6999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | NASHVILLE | TN |
| 2013-09-03 | 615-381-7XXX | 7000–7999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | NASHVILLE | TN |
| 2013-08-27 | 615-258-5XXX | 5000–5999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | NASHVILLE | TN |
| 2013-07-29 | 615-241-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | NSPRINGHIL | TN |
| 2013-05-14 | 615-647-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | NASHVILLE | TN |
| 2013-02-01 | 615-997-2XXX | 2000–2999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | NASHVILLE | TN |
| 2012-09-13 | 615-614-6XXX | 6000–6999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | FRANKLIN | TN |
Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.