NumberResearchRecent thousands-block assignments
0 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, all time — NPA 312
New assignments by month
Sep 2026
Aug 2026
Jul 2026
Jun 2026
May 2026
Apr 2026
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Dec 2025
Nov 2025
Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2022-05-20 | 312-423-0XXX | 0000–0999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 7136 | CHICGOZN01 | IL |
| 2019-06-10 | 312-779-8XXX | 8000–8999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 7136 | CHICGOZN01 | IL |
| 2019-05-01 | 312-741-6XXX | 6000–6999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 7136 | CHICGOZN01 | IL |
| 2019-04-22 | 312-776-0XXX | 0000–0999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 7136 | CHICGOZN01 | IL |
| 2019-04-22 | 312-776-1XXX | 1000–1999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 7136 | CHICGOZN01 | IL |
| 2018-11-14 | 312-761-7XXX | 7000–7999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 7136 | CHICGOZN01 | IL |
| 2018-11-07 | 312-761-6XXX | 6000–6999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 7136 | CHICGOZN01 | IL |
| 2018-10-22 | 312-872-6XXX | 6000–6999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 7136 | CHICGOZN01 | IL |
| 2018-08-24 | 312-741-7XXX | 7000–7999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 7136 | CHICGOZN01 | IL |
| 2018-03-21 | 312-728-5XXX | 5000–5999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 7136 | CHICGOZN01 | IL |
| 2018-03-21 | 312-728-6XXX | 6000–6999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 7136 | CHICGOZN01 | IL |
| 2018-02-28 | 312-728-1XXX | 1000–1999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 7136 | CHICGOZN01 | IL |
| 2017-11-21 | 312-392-3XXX | 3000–3999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 7136 | CHICGOZN01 | IL |
| 2017-11-21 | 312-392-9XXX | 9000–9999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 7136 | CHICGOZN01 | IL |
| 2017-10-23 | 312-736-5XXX | 5000–5999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 7136 | CHICGOZN01 | IL |
| 2017-10-23 | 312-736-6XXX | 6000–6999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 7136 | CHICGOZN01 | IL |
| 2017-10-05 | 312-579-1XXX | 1000–1999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 7136 | CHICGOZN01 | IL |
| 2017-05-17 | 312-319-6XXX | 6000–6999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 7136 | CHICGOZN01 | IL |
| 2016-10-20 | 312-764-4XXX | 4000–4999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 7136 | CHICGOZN01 | IL |
| 2016-10-20 | 312-764-5XXX | 5000–5999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 7136 | CHICGOZN01 | IL |
| 2016-10-20 | 312-764-6XXX | 6000–6999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 7136 | CHICGOZN01 | IL |
| 2016-06-02 | 312-586-3XXX | 3000–3999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 7136 | CHICGOZN01 | IL |
| 2016-06-02 | 312-586-4XXX | 4000–4999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 7136 | CHICGOZN01 | IL |
| 2016-02-02 | 312-383-5XXX | 5000–5999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 7136 | CHICGOZN01 | IL |
| 2016-02-02 | 312-383-6XXX | 6000–6999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 7136 | CHICGOZN01 | IL |
| 2015-09-28 | 312-549-3XXX | 3000–3999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 7136 | CHICGOZN01 | IL |
| 2015-09-28 | 312-549-4XXX | 4000–4999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 7136 | CHICGOZN01 | IL |
| 2015-09-28 | 312-549-5XXX | 5000–5999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 7136 | CHICGOZN01 | IL |
| 2015-09-28 | 312-549-6XXX | 6000–6999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 7136 | CHICGOZN01 | IL |
| 2015-09-28 | 312-549-7XXX | 7000–7999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 7136 | CHICGOZN01 | IL |
| 2015-09-21 | 312-734-2XXX | 2000–2999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 7136 | CHICGOZN01 | IL |
| 2015-09-21 | 312-734-3XXX | 3000–3999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 7136 | CHICGOZN01 | IL |
| 2015-09-21 | 312-734-4XXX | 4000–4999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 7136 | CHICGOZN01 | IL |
| 2015-09-21 | 312-734-5XXX | 5000–5999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 7136 | CHICGOZN01 | IL |
| 2015-09-21 | 312-734-6XXX | 6000–6999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 7136 | CHICGOZN01 | IL |
| 2015-09-21 | 312-734-7XXX | 7000–7999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 7136 | CHICGOZN01 | IL |
| 2015-09-21 | 312-734-8XXX | 8000–8999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 7136 | CHICGOZN01 | IL |
| 2015-09-11 | 312-871-4XXX | 4000–4999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 7136 | CHICGOZN01 | IL |
| 2015-09-11 | 312-871-5XXX | 5000–5999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 7136 | CHICGOZN01 | IL |
| 2015-09-11 | 312-871-6XXX | 6000–6999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 7136 | CHICGOZN01 | IL |
| 2015-08-13 | 312-964-6XXX | 6000–6999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 7136 | CHICGOZN01 | IL |
| 2015-08-13 | 312-964-7XXX | 7000–7999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 7136 | CHICGOZN01 | IL |
| 2015-06-26 | 312-889-5XXX | 5000–5999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 7136 | CHICGOZN01 | IL |
| 2015-06-26 | 312-889-6XXX | 6000–6999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 7136 | CHICGOZN01 | IL |
| 2014-08-12 | 312-995-5XXX | 5000–5999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 7136 | CHICGOZN01 | IL |
| 2014-08-12 | 312-995-6XXX | 6000–6999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 7136 | CHICGOZN01 | IL |
| 2014-08-12 | 312-995-7XXX | 7000–7999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 7136 | CHICGOZN01 | IL |
| 2014-08-12 | 312-995-8XXX | 8000–8999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 7136 | CHICGOZN01 | IL |
| 2014-03-13 | 312-843-5XXX | 5000–5999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 7136 | CHICGOZN01 | IL |
| 2014-03-13 | 312-843-6XXX | 6000–6999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 7136 | 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.