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 331
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 |
|---|---|---|---|---|---|---|---|
| 2022-06-08 | 331-426-2XXX | 2000–2999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 7136 | LEMONT | IL |
| 2022-05-05 | 331-285-6XXX | 6000–6999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 7136 | NAPERVILLE | IL |
| 2021-11-22 | 331-279-6XXX | 6000–6999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 7136 | ELMHURST | IL |
| 2021-02-23 | 331-399-6XXX | 6000–6999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 7136 | DOWNERSGRV | IL |
| 2020-09-24 | 331-260-7XXX | 7000–7999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 7136 | DOWNERSGRV | IL |
| 2019-03-11 | 331-239-6XXX | 6000–6999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 7136 | YORKVILLE | IL |
| 2019-02-26 | 331-260-1XXX | 1000–1999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 7136 | DOWNERSGRV | IL |
| 2018-02-07 | 331-238-1XXX | 1000–1999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 7136 | DOWNERSGRV | IL |
| 2017-12-21 | 331-237-6XXX | 6000–6999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 7136 | NAPERVILLE | IL |
| 2017-12-21 | 331-237-7XXX | 7000–7999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 7136 | NAPERVILLE | IL |
| 2017-12-19 | 331-238-4XXX | 4000–4999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 7136 | DOWNERSGRV | IL |
| 2017-12-19 | 331-238-5XXX | 5000–5999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 7136 | DOWNERSGRV | IL |
| 2017-12-19 | 331-238-6XXX | 6000–6999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 7136 | DOWNERSGRV | IL |
| 2017-10-23 | 331-231-4XXX | 4000–4999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 7136 | NAPERVILLE | IL |
| 2017-10-10 | 331-231-6XXX | 6000–6999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 7136 | NAPERVILLE | IL |
| 2017-09-13 | 331-233-7XXX | 7000–7999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 7136 | DOWNERSGRV | IL |
| 2017-03-29 | 331-757-2XXX | 2000–2999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 7136 | LEMONT | IL |
| 2016-08-04 | 331-300-6XXX | 6000–6999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 7136 | AURORA | IL |
| 2016-06-02 | 331-252-6XXX | 6000–6999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 7136 | WARRENVL | IL |
| 2016-05-18 | 331-806-4XXX | 4000–4999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 7136 | WHEATON | IL |
| 2016-02-22 | 331-254-5XXX | 5000–5999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 7136 | SUGARGROVE | IL |
| 2015-09-30 | 331-253-3XXX | 3000–3999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 7136 | LEMONT | IL |
| 2015-07-10 | 331-903-4XXX | 4000–4999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 7136 | DOWNERSGRV | IL |
| 2014-09-16 | 331-702-7XXX | 7000–7999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 7136 | NAPERVILLE | IL |
| 2014-09-16 | 331-702-8XXX | 8000–8999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 7136 | NAPERVILLE | IL |
| 2014-05-15 | 331-801-2XXX | 2000–2999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 7136 | DOWNERSGRV | IL |
| 2014-05-15 | 331-801-3XXX | 3000–3999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 7136 | DOWNERSGRV | IL |
| 2014-05-15 | 331-801-4XXX | 4000–4999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 7136 | DOWNERSGRV | IL |
| 2014-05-15 | 331-801-5XXX | 5000–5999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 7136 | DOWNERSGRV | IL |
| 2014-05-15 | 331-801-6XXX | 6000–6999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 7136 | DOWNERSGRV | IL |
| 2014-05-15 | 331-801-7XXX | 7000–7999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 7136 | DOWNERSGRV | IL |
| 2013-07-26 | 331-229-5XXX | 5000–5999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 7136 | NAPERVILLE | IL |
| 2013-07-01 | 331-803-6XXX | 6000–6999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 7136 | LEMONT | IL |
| 2013-02-08 | 331-214-6XXX | 6000–6999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 7136 | DOWNERSGRV | 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.