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 203
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 |
|---|---|---|---|---|---|---|---|
| 2014-12-29 | 203-447-6XXX | 6000–6999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | HUNTINGTON | CT |
| 2014-10-02 | 203-447-4XXX | 4000–4999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | HUNTINGTON | CT |
| 2014-09-18 | 203-769-7XXX | 7000–7999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT | 7316 | GREENWICH | CT |
| 2014-03-14 | 203-290-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT | 7230 | BRIDGEPORT | CT |
| 2013-07-02 | 203-704-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | WOLCOTT | CT |
| 2012-09-21 | 203-836-2XXX | 2000–2999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | NEW HAVEN | CT |
| 2012-08-22 | 203-423-8XXX | 8000–8999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT | 7230 | WILTON | CT |
| 2012-08-02 | 203-491-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | NEWTOWN | CT |
| 2011-12-12 | 203-533-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | GUILFORD | CT |
| 2011-10-26 | 203-318-7XXX | 7000–7999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | MADISON | CT |
| 2011-02-25 | 203-212-5XXX | 5000–5999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT | 7230 | BRIDGEPORT | CT |
| 2010-04-21 | 203-937-2XXX | 2000–2999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | NEW HAVEN | CT |
| 2009-07-22 | 203-701-4XXX | 4000–4999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | MILFORD | CT |
| 2008-10-09 | 203-995-0XXX | 0000–0999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT | 7230 | BRIDGEPORT | CT |
| 2008-10-09 | 203-995-1XXX | 1000–1999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT | 7230 | BRIDGEPORT | CT |
| 2008-10-09 | 203-995-2XXX | 2000–2999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT | 7230 | BRIDGEPORT | CT |
| 2008-10-09 | 203-995-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT | 7230 | BRIDGEPORT | CT |
| 2008-10-09 | 203-995-4XXX | 4000–4999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT | 7230 | BRIDGEPORT | CT |
| 2008-10-09 | 203-995-5XXX | 5000–5999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT | 7230 | BRIDGEPORT | CT |
| 2008-10-09 | 203-995-6XXX | 6000–6999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT | 7230 | BRIDGEPORT | CT |
| 2008-10-09 | 203-995-7XXX | 7000–7999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT | 7230 | BRIDGEPORT | CT |
| 2008-10-09 | 203-995-8XXX | 8000–8999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT | 7230 | BRIDGEPORT | CT |
| 2008-10-09 | 203-995-9XXX | 9000–9999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT | 7230 | BRIDGEPORT | CT |
| 2008-09-18 | 203-405-4XXX | 4000–4999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | WOODBURY | CT |
| 2008-09-08 | 203-347-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT | 7316 | BYRAM | CT |
| 2008-09-08 | 203-930-7XXX | 7000–7999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT | 7316 | GREENWICH | CT |
| 2008-08-22 | 203-897-0XXX | 0000–0999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT | 7230 | STAMFORD | CT |
| 2008-08-22 | 203-897-1XXX | 1000–1999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT | 7230 | STAMFORD | CT |
| 2008-08-22 | 203-897-2XXX | 2000–2999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT | 7230 | STAMFORD | CT |
| 2008-08-22 | 203-897-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT | 7230 | STAMFORD | CT |
| 2008-08-22 | 203-897-4XXX | 4000–4999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT | 7230 | STAMFORD | CT |
| 2008-08-22 | 203-897-5XXX | 5000–5999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT | 7230 | STAMFORD | CT |
| 2008-08-22 | 203-897-6XXX | 6000–6999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT | 7230 | STAMFORD | CT |
| 2008-08-22 | 203-897-7XXX | 7000–7999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT | 7230 | STAMFORD | CT |
| 2008-08-22 | 203-897-8XXX | 8000–8999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT | 7230 | STAMFORD | CT |
| 2008-08-22 | 203-897-9XXX | 9000–9999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT | 7230 | STAMFORD | CT |
| 2008-05-28 | 203-721-8XXX | 8000–8999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | WATERBURY | CT |
| 2008-05-27 | 203-433-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | BRANFORD | CT |
| 2008-05-27 | 203-463-6XXX | 6000–6999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | SEYMOUR | CT |
| 2008-05-27 | 203-497-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | NEW HAVEN | CT |
| 2008-05-27 | 203-893-4XXX | 4000–4999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | ANSONIDRBY | CT |
| 2008-02-20 | 203-992-0XXX | 0000–0999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT | 7230 | GREENWICH | CT |
| 2008-02-20 | 203-992-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT | 7230 | GREENWICH | CT |
| 2007-10-23 | 203-873-2XXX | 2000–2999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT | 7230 | BRIDGEPORT | CT |
| 2007-10-23 | 203-873-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT | 7230 | BRIDGEPORT | CT |
| 2007-10-23 | 203-873-4XXX | 4000–4999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT | 7230 | BRIDGEPORT | CT |
| 2007-10-23 | 203-873-5XXX | 5000–5999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT | 7230 | BRIDGEPORT | CT |
| 2007-06-08 | 203-296-5XXX | 5000–5999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT | 7230 | BRIDGEPORT | CT |
| 2007-06-08 | 203-296-6XXX | 6000–6999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT | 7230 | BRIDGEPORT | CT |
| 2007-06-08 | 203-296-7XXX | 7000–7999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT | 7230 | BRIDGEPORT | CT |
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.