NumberResearchRecent thousands-block assignments
0 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/25/2026
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 931
New assignments by month
Sep 2026
Aug 2026
Jul 2026
Jun 2026
May 2026
Apr 2026
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Dec 2025
Nov 2025
Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2018-05-04 | 931-774-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | MTPLEASANT | TN |
| 2017-01-11 | 931-386-4XXX | 4000–4999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | WINCHESTER | TN |
| 2016-03-25 | 931-534-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | DOVER | TN |
| 2016-03-25 | 931-820-6XXX | 6000–6999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | SANGO | TN |
| 2016-02-11 | 931-716-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | CENTERVL | TN |
| 2015-12-22 | 931-288-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | LEWISBURG | TN |
| 2015-10-22 | 931-503-7XXX | 7000–7999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | CLARKSVL | TN |
| 2013-12-10 | 931-450-7XXX | 7000–7999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | MANCHESTER | TN |
| 2013-10-01 | 931-546-4XXX | 4000–4999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | SOOAKGROVE | TN |
| 2011-11-22 | 931-295-4XXX | 4000–4999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | HOHENWALD | TN |
| 2011-06-29 | 931-499-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | SPRINGHILL | TN |
| 2010-12-29 | 931-279-5XXX | 5000–5999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | LAWRENCEBG | TN |
| 2010-12-29 | 931-371-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | PULASKI | TN |
| 2010-12-29 | 931-557-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | FAYETTEVL | TN |
| 2010-01-12 | 931-264-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | WAVERLY | TN |
| 2006-10-27 | 931-392-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | WINCHESTER | TN |
| 2006-10-27 | 931-536-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | SHELBYVL | TN |
| 2006-10-27 | 931-548-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | COLUMBIA | TN |
| 2006-10-27 | 931-588-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | TULLAHOMA | TN |
| 2006-07-21 | 931-933-7XXX | 7000–7999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | CLARKSVL | TN |
| 2006-03-28 | 931-241-4XXX | 4000–4999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | CLARKSVL | TN |
| 2006-01-24 | 931-241-5XXX | 5000–5999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | CLARKSVL | TN |
| 2006-01-24 | 931-241-6XXX | 6000–6999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | CLARKSVL | TN |
| 2004-05-13 | 931-443-0XXX | 0000–0999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | CLARKSVL | TN |
| 2004-05-13 | 931-443-1XXX | 1000–1999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | CLARKSVL | TN |
| 2004-05-13 | 931-443-2XXX | 2000–2999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | CLARKSVL | TN |
| 2004-05-13 | 931-443-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | CLARKSVL | TN |
| 2004-05-13 | 931-443-4XXX | 4000–4999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | CLARKSVL | TN |
| 2004-05-13 | 931-443-5XXX | 5000–5999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | CLARKSVL | TN |
| 2004-05-13 | 931-443-6XXX | 6000–6999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | CLARKSVL | TN |
| 2004-05-13 | 931-443-7XXX | 7000–7999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | CLARKSVL | TN |
| 2004-05-13 | 931-443-8XXX | 8000–8999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | CLARKSVL | TN |
| 2004-05-13 | 931-443-9XXX | 9000–9999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN | 7977 | CLARKSVL | TN |
Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/25/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.