NumberResearchRecent thousands-block assignments
0 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/26/2026
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 253
New assignments by month
Sep 2026
Aug 2026
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2018-11-06 | 253-251-5XXX | 5000–5999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - WA | 7274 | PUYALLUP | WA |
| 2018-09-25 | 253-993-2XXX | 2000–2999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - WA | 7274 | TACOMAWVLY | WA |
| 2016-07-12 | 253-321-7XXX | 7000–7999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - WA | 7274 | SUMNER | WA |
| 2013-02-15 | 253-733-5XXX | 5000–5999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - WA | 7274 | DES MOINES | WA |
| 2012-08-30 | 253-256-6XXX | 6000–6999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - WA | 7274 | PUYALLUP | WA |
| 2012-04-18 | 253-733-4XXX | 4000–4999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - WA | 7274 | DES MOINES | WA |
| 2007-11-14 | 253-398-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - WA | 7274 | KENT | WA |
| 2007-10-19 | 253-292-4XXX | 4000–4999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - WA | 7274 | TACOMA | WA |
| 2007-03-22 | 253-271-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - WA | 7274 | GRAHAM | WA |
| 2007-02-22 | 253-733-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - WA | 7274 | DES MOINES | WA |
| 2006-11-16 | 253-881-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - WA | 7274 | PUYALLUP | WA |
| 2006-10-06 | 253-655-8XXX | 8000–8999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - WA | 7274 | GRAHAM | WA |
| 2005-11-23 | 253-321-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - WA | 7274 | SUMNER | WA |
| 2005-06-21 | 253-883-2XXX | 2000–2999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - WA | 7274 | TACOMAWVLY | WA |
| 2005-06-21 | 253-883-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - WA | 7274 | TACOMAWVLY | WA |
| 2005-06-21 | 253-883-4XXX | 4000–4999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - WA | 7274 | TACOMAWVLY | WA |
| 2005-06-21 | 253-883-6XXX | 6000–6999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - WA | 7274 | TACOMAWVLY | WA |
| 2004-02-20 | 253-200-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - WA | 7274 | PUYALLUP | WA |
| 2004-02-20 | 253-299-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - WA | 7274 | SUMNER | WA |
| 2004-02-20 | 253-344-4XXX | 4000–4999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - WA | 7274 | TACOMAWVLY | WA |
Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/26/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.