NumberResearchRecent thousands-block assignments
1 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/20/2026
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, last 30 days — NPA 312
New assignments by month
Sep 2026
Aug 2026
Jul 2026
Jun 2026
May 2026
Apr 2026
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2009-09-16 | 312-945-5XXX | 5000–5999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | CHICGOZN01 | IL |
| 2009-09-03 | 312-476-8XXX | 8000–8999 | Assigned | FIRST COMMUNICATIONS, LLC | 460K | CHICGOZN01 | IL |
| 2009-08-11 | 312-428-5XXX | 5000–5999 | Assigned | ONVOY, LLC | 224C | CHICGOZN01 | IL |
| 2009-08-11 | 312-428-6XXX | 6000–6999 | Assigned | ONVOY, LLC | 224C | CHICGOZN01 | IL |
| 2009-08-11 | 312-428-7XXX | 7000–7999 | Assigned | ONVOY, LLC | 224C | CHICGOZN01 | IL |
| 2009-08-11 | 312-428-9XXX | 9000–9999 | Assigned | ONVOY, LLC | 224C | CHICGOZN01 | IL |
| 2009-08-11 | 312-450-2XXX | 2000–2999 | Assigned | ONVOY, LLC | 224C | CHICGOZN01 | IL |
| 2009-08-11 | 312-450-3XXX | 3000–3999 | Assigned | ONVOY, LLC | 224C | CHICGOZN01 | IL |
| 2009-08-11 | 312-450-7XXX | 7000–7999 | Assigned | ONVOY, LLC | 224C | CHICGOZN01 | IL |
| 2009-08-11 | 312-675-2XXX | 2000–2999 | Assigned | ONVOY, LLC | 224C | CHICGOZN01 | IL |
| 2009-08-11 | 312-675-8XXX | 8000–8999 | Assigned | ONVOY, LLC | 224C | CHICGOZN01 | IL |
| 2009-08-11 | 312-994-1XXX | 1000–1999 | Assigned | PAETEC ITEL, LLC | 829J | CHICGOZN01 | IL |
| 2009-08-10 | 312-450-8XXX | 8000–8999 | Assigned | ACCESS ONE, INC. - IL | 5447 | CHICGOZN01 | IL |
| 2009-08-10 | 312-460-3XXX | 3000–3999 | Assigned | ACCESS ONE, INC. - IL | 5447 | CHICGOZN01 | IL |
| 2009-08-10 | 312-725-2XXX | 2000–2999 | Assigned | BANDWIDTH.COM CLEC, LLC - IL | 984E | CHICGOZN01 | IL |
| 2009-08-10 | 312-725-3XXX | 3000–3999 | Assigned | BANDWIDTH.COM CLEC, LLC - IL | 984E | CHICGOZN01 | IL |
| 2009-08-10 | 312-725-4XXX | 4000–4999 | Assigned | BANDWIDTH.COM CLEC, LLC - IL | 984E | CHICGOZN01 | IL |
| 2009-08-10 | 312-725-6XXX | 6000–6999 | Assigned | BANDWIDTH.COM CLEC, LLC - IL | 984E | CHICGOZN01 | IL |
| 2009-08-10 | 312-725-8XXX | 8000–8999 | Assigned | BANDWIDTH.COM CLEC, LLC - IL | 984E | CHICGOZN01 | IL |
| 2009-08-10 | 312-725-9XXX | 9000–9999 | Assigned | BANDWIDTH.COM CLEC, LLC - IL | 984E | CHICGOZN01 | IL |
| 2009-08-10 | 312-772-2XXX | 2000–2999 | Assigned | BANDWIDTH.COM CLEC, LLC - IL | 984E | CHICGOZN01 | IL |
| 2009-08-10 | 312-772-3XXX | 3000–3999 | Assigned | BANDWIDTH.COM CLEC, LLC - IL | 984E | CHICGOZN01 | IL |
| 2009-08-10 | 312-772-4XXX | 4000–4999 | Assigned | BANDWIDTH.COM CLEC, LLC - IL | 984E | CHICGOZN01 | IL |
| 2009-08-10 | 312-772-5XXX | 5000–5999 | Assigned | BANDWIDTH.COM CLEC, LLC - IL | 984E | CHICGOZN01 | IL |
| 2009-07-29 | 312-994-4XXX | 4000–4999 | Assigned | PAETEC ITEL, LLC | 829J | CHICGOZN01 | IL |
| 2009-07-23 | 312-725-1XXX | 1000–1999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 7136 | CHICGOZN01 | IL |
| 2009-07-23 | 312-725-5XXX | 5000–5999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 7136 | CHICGOZN01 | IL |
| 2009-07-23 | 312-725-7XXX | 7000–7999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 7136 | CHICGOZN01 | IL |
| 2009-06-04 | 312-462-9XXX | 9000–9999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | CHICGOZN01 | IL |
| 2009-05-12 | 312-262-8XXX | 8000–8999 | Assigned | T-MOBILE USA, INC. | 6529 | CHICGOZN01 | IL |
| 2009-05-12 | 312-267-9XXX | 9000–9999 | Assigned | T-MOBILE USA, INC. | 6529 | CHICGOZN01 | IL |
| 2009-05-12 | 312-348-0XXX | 0000–0999 | Assigned | T-MOBILE USA, INC. | 6529 | CHICGOZN01 | IL |
| 2009-05-12 | 312-348-9XXX | 9000–9999 | Assigned | T-MOBILE USA, INC. | 6529 | CHICGOZN01 | IL |
| 2009-05-12 | 312-489-4XXX | 4000–4999 | Assigned | T-MOBILE USA, INC. | 6529 | CHICGOZN01 | IL |
| 2009-05-05 | 312-945-9XXX | 9000–9999 | Assigned | T-MOBILE USA, INC. | 6529 | CHICGOZN01 | IL |
| 2009-04-06 | 312-768-1XXX | 1000–1999 | Assigned | PAETEC ITEL, LLC | 829J | CHICGOZN01 | IL |
| 2009-03-27 | 312-465-1XXX | 1000–1999 | Assigned | PAETEC ITEL, LLC | 829J | CHICGOZN01 | IL |
| 2009-03-27 | 312-521-4XXX | 4000–4999 | Assigned | PAETEC ITEL, LLC | 829J | CHICGOZN01 | IL |
| 2009-03-27 | 312-537-6XXX | 6000–6999 | Assigned | PAETEC ITEL, LLC | 829J | CHICGOZN01 | IL |
| 2009-03-23 | 312-546-7XXX | 7000–7999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | CHICGOZN01 | IL |
| 2009-03-23 | 312-546-8XXX | 8000–8999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | CHICGOZN01 | IL |
| 2009-03-23 | 312-546-9XXX | 9000–9999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | CHICGOZN01 | IL |
| 2009-02-20 | 312-262-3XXX | 3000–3999 | Assigned | ONVOY, LLC | 224C | CHICGOZN01 | IL |
| 2009-02-20 | 312-262-4XXX | 4000–4999 | Assigned | ONVOY, LLC | 224C | CHICGOZN01 | IL |
| 2009-02-20 | 312-262-5XXX | 5000–5999 | Assigned | ONVOY, LLC | 224C | CHICGOZN01 | IL |
| 2009-02-20 | 312-262-6XXX | 6000–6999 | Assigned | ONVOY, LLC | 224C | CHICGOZN01 | IL |
| 2009-02-19 | 312-582-1XXX | 1000–1999 | Assigned | FIRST COMMUNICATIONS, LLC | 460K | CHICGOZN01 | IL |
| 2009-01-26 | 312-253-3XXX | 3000–3999 | Assigned | PAETEC ITEL, LLC | 829J | CHICGOZN01 | IL |
| 2009-01-22 | 312-348-1XXX | 1000–1999 | Assigned | ACCESS ONE, INC. - IL | 5447 | CHICGOZN01 | IL |
| 2009-01-22 | 312-521-5XXX | 5000–5999 | Assigned | ACCESS ONE, INC. - IL | 5447 | CHICGOZN01 | IL |
Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/20/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.