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 425
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 |
|---|---|---|---|---|---|---|---|
| 2023-03-31 | 425-474-8XXX | 8000–8999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | EVERETT | WA |
| 2019-11-08 | 425-403-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - WA | 7274 | KIRKLAND | WA |
| 2019-05-06 | 425-436-2XXX | 2000–2999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | BELLEVUE | WA |
| 2019-05-06 | 425-436-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | BELLEVUE | WA |
| 2018-04-17 | 425-363-1XXX | 1000–1999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | NORTH BEND | WA |
| 2017-10-13 | 425-382-4XXX | 4000–4999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | EVERETT | WA |
| 2017-06-20 | 425-588-4XXX | 4000–4999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - WA | 7274 | KIRKLAND | WA |
| 2017-06-14 | 425-659-7XXX | 7000–7999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | BOTHELL | WA |
| 2016-10-26 | 425-362-1XXX | 1000–1999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | BELLEVUE | WA |
| 2016-07-07 | 425-215-7XXX | 7000–7999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | BOTHELL | WA |
| 2016-05-23 | 425-690-0XXX | 0000–0999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | RENTON | WA |
| 2016-05-23 | 425-690-1XXX | 1000–1999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | RENTON | WA |
| 2016-05-23 | 425-690-2XXX | 2000–2999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | RENTON | WA |
| 2016-05-23 | 425-690-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | RENTON | WA |
| 2016-05-23 | 425-690-4XXX | 4000–4999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | RENTON | WA |
| 2016-05-23 | 425-690-5XXX | 5000–5999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | RENTON | WA |
| 2016-05-23 | 425-690-6XXX | 6000–6999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | RENTON | WA |
| 2016-05-23 | 425-690-7XXX | 7000–7999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | RENTON | WA |
| 2016-05-23 | 425-690-8XXX | 8000–8999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | RENTON | WA |
| 2016-05-23 | 425-690-9XXX | 9000–9999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | RENTON | WA |
| 2015-06-17 | 425-595-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | EVERETT | WA |
| 2014-12-22 | 425-305-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - WA | 7274 | KIRKLAND | WA |
| 2012-07-03 | 425-777-2XXX | 2000–2999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | BELLEVUE | WA |
| 2011-09-19 | 425-658-5XXX | 5000–5999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | KIRKLAND | WA |
| 2011-07-12 | 425-505-4XXX | 4000–4999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | BELLEVUE | WA |
| 2011-01-28 | 425-404-2XXX | 2000–2999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | EVERETT | WA |
| 2010-09-29 | 425-633-2XXX | 2000–2999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | BELLEVUE | WA |
| 2010-09-29 | 425-633-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | BELLEVUE | WA |
| 2010-03-02 | 425-406-6XXX | 6000–6999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | KIRKLAND | WA |
| 2009-10-15 | 425-629-7XXX | 7000–7999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - WA | 7274 | KIRKLAND | WA |
| 2008-11-19 | 425-516-6XXX | 6000–6999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | BELLEVUE | WA |
| 2008-10-24 | 425-449-4XXX | 4000–4999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | BELLEVUE | WA |
| 2008-10-24 | 425-449-5XXX | 5000–5999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | BELLEVUE | WA |
| 2008-10-06 | 425-368-7XXX | 7000–7999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | BOTHELL | WA |
| 2008-10-06 | 425-420-2XXX | 2000–2999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | BOTHELL | WA |
| 2008-09-08 | 425-968-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - WA | 7274 | KIRKLAND | WA |
| 2008-06-06 | 425-224-2XXX | 2000–2999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | SILVERLAKE | WA |
| 2008-05-12 | 425-636-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - WA | 7274 | KIRKLAND | WA |
| 2007-11-21 | 425-999-8XXX | 8000–8999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | BELLEVUE | WA |
| 2007-08-21 | 425-502-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | BELLEVUE | WA |
| 2007-08-21 | 425-502-4XXX | 4000–4999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | BELLEVUE | WA |
| 2007-07-23 | 425-405-4XXX | 4000–4999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | EVERETT | WA |
| 2006-10-06 | 425-636-4XXX | 4000–4999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - WA | 7274 | KIRKLAND | WA |
| 2006-10-06 | 425-636-5XXX | 5000–5999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - WA | 7274 | KIRKLAND | WA |
| 2006-10-06 | 425-636-7XXX | 7000–7999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - WA | 7274 | KIRKLAND | WA |
| 2006-07-26 | 425-529-9XXX | 9000–9999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | RENTON | WA |
| 2005-10-10 | 425-216-5XXX | 5000–5999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | KIRKLAND | WA |
| 2005-10-10 | 425-249-7XXX | 7000–7999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | EVERETT | WA |
| 2005-10-10 | 425-284-8XXX | 8000–8999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - WA | 7274 | KIRKLAND | WA |
| 2005-10-10 | 425-297-4XXX | 4000–4999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | EVERETT | WA |
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.