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 713
New assignments by month
Sep 2026
Aug 2026
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Jun 2026
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2012-09-21 | 713-231-1XXX | 1000–1999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | HOUSTON | TX |
| 2012-08-14 | 713-730-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | HOUSTON | TX |
| 2012-08-14 | 713-730-4XXX | 4000–4999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | HOUSTON | TX |
| 2012-08-14 | 713-730-5XXX | 5000–5999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | HOUSTON | TX |
| 2012-02-03 | 713-904-2XXX | 2000–2999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | HOUSTON | TX |
| 2012-02-03 | 713-904-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | HOUSTON | TX |
| 2012-02-03 | 713-904-4XXX | 4000–4999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | HOUSTON | TX |
| 2012-02-03 | 713-904-5XXX | 5000–5999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | HOUSTON | TX |
| 2012-02-01 | 713-904-7XXX | 7000–7999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TX | 7239 | HOUSTON | TX |
| 2012-01-03 | 713-969-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | HOUSTON | TX |
| 2012-01-03 | 713-969-4XXX | 4000–4999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | HOUSTON | TX |
| 2012-01-03 | 713-969-5XXX | 5000–5999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | HOUSTON | TX |
| 2011-11-18 | 713-280-7XXX | 7000–7999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TX | 7239 | HSTNSUBURB | TX |
| 2011-11-02 | 713-909-8XXX | 8000–8999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TX | 7239 | HSTNSUBURB | TX |
| 2010-11-09 | 713-797-2XXX | 2000–2999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TX | 7239 | HOUSTON | TX |
| 2010-10-11 | 713-588-1XXX | 1000–1999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | HOUSTON | TX |
| 2010-10-11 | 713-588-2XXX | 2000–2999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | HOUSTON | TX |
| 2010-10-11 | 713-588-4XXX | 4000–4999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | HOUSTON | TX |
| 2010-10-11 | 713-588-8XXX | 8000–8999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | HOUSTON | TX |
| 2010-07-09 | 713-496-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TX | 7239 | HOUSTON | TX |
| 2010-07-09 | 713-496-4XXX | 4000–4999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TX | 7239 | HOUSTON | TX |
| 2010-07-09 | 713-496-5XXX | 5000–5999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TX | 7239 | HOUSTON | TX |
| 2010-07-09 | 713-496-6XXX | 6000–6999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TX | 7239 | HOUSTON | TX |
| 2010-07-09 | 713-496-7XXX | 7000–7999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TX | 7239 | HOUSTON | TX |
| 2010-07-09 | 713-496-8XXX | 8000–8999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TX | 7239 | HOUSTON | TX |
| 2009-01-15 | 713-234-5XXX | 5000–5999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TX | 7239 | SUGAR LAND | TX |
| 2007-11-28 | 713-258-1XXX | 1000–1999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TX | 7239 | HOUSTON | TX |
| 2007-11-28 | 713-258-2XXX | 2000–2999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TX | 7239 | HOUSTON | TX |
| 2007-11-28 | 713-258-8XXX | 8000–8999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TX | 7239 | HOUSTON | TX |
| 2007-11-28 | 713-258-9XXX | 9000–9999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | HOUSTON | TX |
| 2007-08-22 | 713-323-0XXX | 0000–0999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TX | 7239 | HSTNSUBURB | TX |
| 2007-08-22 | 713-323-1XXX | 1000–1999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TX | 7239 | HSTNSUBURB | TX |
| 2007-08-22 | 713-323-2XXX | 2000–2999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TX | 7239 | HSTNSUBURB | TX |
| 2007-08-22 | 713-323-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TX | 7239 | HSTNSUBURB | TX |
| 2007-08-22 | 713-323-4XXX | 4000–4999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TX | 7239 | HSTNSUBURB | TX |
| 2007-08-22 | 713-323-5XXX | 5000–5999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TX | 7239 | HSTNSUBURB | TX |
| 2007-08-22 | 713-323-6XXX | 6000–6999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TX | 7239 | HSTNSUBURB | TX |
| 2007-08-22 | 713-323-7XXX | 7000–7999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TX | 7239 | HSTNSUBURB | TX |
| 2007-08-22 | 713-323-8XXX | 8000–8999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TX | 7239 | HSTNSUBURB | TX |
| 2007-08-22 | 713-323-9XXX | 9000–9999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TX | 7239 | HSTNSUBURB | TX |
| 2007-06-15 | 713-758-0XXX | 0000–0999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | HOUSTON | TX |
| 2007-06-15 | 713-793-6XXX | 6000–6999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | HOUSTON | TX |
| 2007-06-15 | 713-820-9XXX | 9000–9999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | HOUSTON | TX |
| 2004-08-27 | 713-513-5XXX | 5000–5999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | HOUSTON | TX |
| 2004-07-13 | 713-456-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | HOUSTON | TX |
| 2004-07-13 | 713-456-7XXX | 7000–7999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | HOUSTON | TX |
| 2004-04-20 | 713-456-2XXX | 2000–2999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | HOUSTON | TX |
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.