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 603
New assignments by month
Sep 2026
Aug 2026
Jul 2026
Jun 2026
May 2026
Apr 2026
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Jan 2026
Dec 2025
Nov 2025
Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2026-02-19 | 603-501-2XXX | 2000–2999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | PORTSMOUTH | NH |
| 2023-10-17 | 603-805-2XXX | 2000–2999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NH | 7778 | CONCORD | NH |
| 2020-06-11 | 603-212-7XXX | 7000–7999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NH | 7778 | SALEM | NH |
| 2020-03-12 | 603-310-6XXX | 6000–6999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NH | 7778 | BEDFORD | NH |
| 2020-03-12 | 603-408-2XXX | 2000–2999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NH | 7778 | BERLIN | NH |
| 2019-12-16 | 603-406-2XXX | 2000–2999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NH | 7778 | CONCORD | NH |
| 2019-09-04 | 603-506-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NH | 7778 | MANCHESTER | NH |
| 2019-08-20 | 603-368-8XXX | 8000–8999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NH | 7778 | PORTSMOUTH | NH |
| 2019-03-26 | 603-379-5XXX | 5000–5999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NH | 7778 | RYE BEACH | NH |
| 2019-01-11 | 603-353-5XXX | 5000–5999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NH | 7778 | ORFORD | NH |
| 2019-01-11 | 603-904-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NH | 7778 | WALPOLE | NH |
| 2018-08-16 | 603-605-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NH | 7778 | DOVER | NH |
| 2018-07-16 | 603-614-6XXX | 6000–6999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NH | 7778 | WCHESTEFLD | NH |
| 2016-06-23 | 603-309-2XXX | 2000–2999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NH | 7778 | NEWPORT | NH |
| 2016-02-26 | 603-901-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NH | 7778 | CONWAY | NH |
| 2016-01-06 | 603-200-4XXX | 4000–4999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NH | 7778 | NEWMARKET | NH |
| 2015-12-28 | 603-751-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NH | 7778 | PELHAM | NH |
| 2015-08-25 | 603-263-9XXX | 9000–9999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NH | 7778 | MANCHESTER | NH |
| 2015-07-08 | 603-215-7XXX | 7000–7999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NH | 7778 | BERLIN | NH |
| 2015-05-26 | 603-931-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NH | 7778 | CONCORD | NH |
| 2015-04-24 | 603-301-5XXX | 5000–5999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NH | 7778 | CTROSSIPEE | NH |
| 2015-03-16 | 603-383-2XXX | 2000–2999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NH | 7778 | JACKSON | NH |
| 2014-10-22 | 603-824-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NH | 7778 | SALEM | NH |
| 2014-06-10 | 603-263-8XXX | 8000–8999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NH | 7778 | MANCHESTER | NH |
| 2013-11-26 | 603-266-5XXX | 5000–5999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NH | 7778 | TILTON | NH |
| 2013-07-02 | 603-291-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NH | 7778 | GREENVILLE | NH |
| 2013-07-02 | 603-758-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NH | 7778 | HAMPTON | NH |
| 2013-02-28 | 603-200-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NH | 7778 | NEWMARKET | NH |
| 2013-02-19 | 603-637-4XXX | 4000–4999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NH | 7778 | BEDFORD | NH |
| 2012-11-07 | 603-537-6XXX | 6000–6999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NH | 7778 | DERRY | NH |
| 2012-03-28 | 603-263-7XXX | 7000–7999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NH | 7778 | MANCHESTER | NH |
| 2012-03-21 | 603-570-6XXX | 6000–6999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NH | 7778 | PORTSMOUTH | NH |
| 2012-03-20 | 603-336-2XXX | 2000–2999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NH | 7778 | HINSDALE | NH |
| 2011-12-21 | 603-814-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NH | 7778 | SEABROOK | NH |
| 2011-11-22 | 603-787-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NH | 7778 | WOODSVILLE | NH |
| 2011-09-30 | 603-263-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NH | 7778 | MANCHESTER | NH |
| 2010-12-29 | 603-215-5XXX | 5000–5999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NH | 7778 | BERLIN | NH |
| 2008-08-11 | 603-276-4XXX | 4000–4999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NH | 7778 | W LEBANON | NH |
| 2008-02-07 | 603-277-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NH | 7778 | HANOVER | NH |
| 2007-12-14 | 603-489-6XXX | 6000–6999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NH | 7778 | HAMPSTEAD | NH |
| 2007-06-27 | 603-389-2XXX | 2000–2999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NH | 7778 | DURHAM | NH |
| 2007-06-27 | 603-833-2XXX | 2000–2999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NH | 7778 | ROCHESTER | NH |
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.