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 601
New assignments by month
Sep 2026
Aug 2026
Jul 2026
Jun 2026
May 2026
Apr 2026
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Dec 2025
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2020-08-18 | 601-521-6XXX | 6000–6999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MS | 4886 | MADISON | MS |
| 2019-10-23 | 601-821-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MS | 4886 | NVALAIRSTA | MS |
| 2017-03-06 | 601-756-5XXX | 5000–5999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MS | 4886 | MONTICELLO | MS |
| 2017-03-01 | 601-617-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MS | 4886 | PORTGIBSON | MS |
| 2017-03-01 | 601-786-2XXX | 2000–2999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MS | 4886 | FAYETTE | MS |
| 2017-03-01 | 601-793-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MS | 4886 | DE KALB | MS |
| 2017-03-01 | 601-822-6XXX | 6000–6999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MS | 4886 | RALEIGH | MS |
| 2017-03-01 | 601-980-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MS | 4886 | LIBERTY | MS |
| 2016-02-05 | 601-746-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MS | 4886 | POPLARVL | MS |
| 2016-02-05 | 601-808-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MS | 4886 | MENDENHALL | MS |
| 2016-02-05 | 601-827-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MS | 4886 | TYLERTOWN | MS |
| 2016-02-05 | 601-837-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MS | 4886 | COLLINS | MS |
| 2014-02-28 | 601-909-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MS | 4886 | HATTIESBG | MS |
| 2014-01-23 | 601-882-9XXX | 9000–9999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MS | 4886 | JACKSON | MS |
| 2013-11-26 | 601-912-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MS | 4886 | RICHTON | MS |
| 2012-06-07 | 601-653-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MS | 4886 | NATCHEZ | MS |
| 2011-12-27 | 601-674-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MS | 4886 | COLUMBIA | MS |
| 2011-02-23 | 601-563-6XXX | 6000–6999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MS | 4886 | WESSON | MS |
| 2011-02-23 | 601-574-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MS | 4886 | HAZLEHURST | MS |
| 2011-02-23 | 601-780-4XXX | 4000–4999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MS | 4886 | CARTHAGE | MS |
| 2011-01-20 | 601-493-8XXX | 8000–8999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MS | 4886 | NATCHEZ | MS |
| 2011-01-13 | 601-900-4XXX | 4000–4999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MS | 4886 | FOREST | MS |
| 2010-10-19 | 601-476-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MS | 4886 | WIGGINS | MS |
| 2010-10-19 | 601-673-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MS | 4886 | LUCEDALE | MS |
| 2010-08-09 | 601-768-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MS | 4886 | QUITMAN | MS |
| 2010-06-14 | 601-533-4XXX | 4000–4999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MS | 4886 | BOLTON | MS |
| 2010-05-26 | 601-600-5XXX | 5000–5999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MS | 4886 | MCCOMB | MS |
| 2009-11-25 | 601-509-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MS | 4886 | WAYNESBORO | MS |
| 2006-11-30 | 601-262-2XXX | 2000–2999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MS | 4886 | VICKSBURG | MS |
| 2006-11-30 | 601-282-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MS | 4886 | MERIDIAN | MS |
| 2006-11-30 | 601-283-4XXX | 4000–4999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MS | 4886 | LAUREL | MS |
| 2006-11-30 | 601-329-2XXX | 2000–2999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MS | 4886 | HATTIESBG | MS |
| 2006-11-30 | 601-493-2XXX | 2000–2999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MS | 4886 | NATCHEZ | MS |
| 2006-11-30 | 601-667-2XXX | 2000–2999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MS | 4886 | CANTON | MS |
| 2006-11-30 | 601-724-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MS | 4886 | BRANDON | MS |
| 2006-11-30 | 601-990-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MS | 4886 | BROOKHAVEN | MS |
| 2006-05-19 | 601-790-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MS | 4886 | MADISON | MS |
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.