NumberResearchRecent thousands-block assignments
0 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/19/2026
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
Jul 2026
Jun 2026
May 2026
Apr 2026
Mar 2026
Feb 2026
Jan 2026
Dec 2025
Nov 2025
Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2020-09-03 | 331-264-8XXX | 8000–8999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - IL | 6115 | HINSDALE | IL |
| 2020-06-03 | 331-264-5XXX | 5000–5999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - IL | 6115 | HINSDALE | IL |
| 2020-03-06 | 331-264-1XXX | 1000–1999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - IL | 6115 | HINSDALE | IL |
| 2020-02-27 | 331-732-6XXX | 6000–6999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - IL | 6115 | GENEVA | IL |
| 2020-02-27 | 331-732-7XXX | 7000–7999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - IL | 6115 | GENEVA | IL |
| 2020-02-27 | 331-732-8XXX | 8000–8999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - IL | 6115 | GENEVA | IL |
| 2020-02-27 | 331-732-9XXX | 9000–9999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - IL | 6115 | GENEVA | IL |
| 2020-01-25 | 331-732-0XXX | 0000–0999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - IL | 6115 | GENEVA | IL |
| 2020-01-25 | 331-732-1XXX | 1000–1999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - IL | 6115 | GENEVA | IL |
| 2020-01-25 | 331-732-2XXX | 2000–2999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - IL | 6115 | GENEVA | IL |
| 2020-01-25 | 331-732-3XXX | 3000–3999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - IL | 6115 | GENEVA | IL |
| 2020-01-25 | 331-732-4XXX | 4000–4999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - IL | 6115 | GENEVA | IL |
| 2019-08-05 | 331-236-3XXX | 3000–3999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - IL | 6115 | WHEATON | IL |
| 2017-10-11 | 331-236-7XXX | 7000–7999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - IL | 6115 | WHEATON | IL |
| 2015-12-15 | 331-401-1XXX | 1000–1999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - IL | 6115 | NAPERVILLE | IL |
| 2015-07-30 | 331-814-2XXX | 2000–2999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - IL | 6115 | NAPERVILLE | IL |
| 2015-07-28 | 331-301-2XXX | 2000–2999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - IL | 6115 | AURORA | IL |
| 2014-04-16 | 331-305-2XXX | 2000–2999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - IL | 6115 | NAPERVILLE | IL |
| 2014-03-26 | 331-208-9XXX | 9000–9999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - IL | 6115 | AURORA | IL |
| 2014-01-15 | 331-318-3XXX | 3000–3999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - IL | 6115 | LEMONT | IL |
| 2013-12-26 | 331-305-6XXX | 6000–6999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - IL | 6115 | NAPERVILLE | IL |
| 2013-03-12 | 331-215-5XXX | 5000–5999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - IL | 6115 | NAPERVILLE | IL |
| 2012-12-17 | 331-209-6XXX | 6000–6999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - IL | 6115 | ELMHURST | IL |
| 2012-12-17 | 331-215-6XXX | 6000–6999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - IL | 6115 | NAPERVILLE | IL |
| 2012-12-14 | 331-208-5XXX | 5000–5999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - IL | 6115 | AURORA | IL |
| 2012-11-30 | 331-214-5XXX | 5000–5999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - IL | 6115 | DOWNERSGRV | IL |
| 2012-08-03 | 331-422-3XXX | 3000–3999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - IL | 6115 | ST CHARLES | IL |
| 2012-05-24 | 331-212-4XXX | 4000–4999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - IL | 6115 | AURORA | IL |
| 2012-02-03 | 331-422-7XXX | 7000–7999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - IL | 6115 | ST CHARLES | IL |
| 2011-12-01 | 331-200-2XXX | 2000–2999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - IL | 6115 | BARTLETT | IL |
| 2011-11-07 | 331-207-2XXX | 2000–2999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - IL | 6115 | YORKVILLE | IL |
| 2010-11-24 | 331-472-8XXX | 8000–8999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - IL | 6115 | NAPERVILLE | IL |
| 2010-10-27 | 331-472-3XXX | 3000–3999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - IL | 6115 | NAPERVILLE | IL |
| 2010-02-11 | 331-330-4XXX | 4000–4999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - IL | 6115 | NAPERVILLE | IL |
| 2009-10-21 | 331-330-2XXX | 2000–2999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - IL | 6115 | NAPERVILLE | IL |
| 2009-06-18 | 331-481-8XXX | 8000–8999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - IL | 6115 | DOWNERSGRV | IL |
| 2009-06-18 | 331-826-0XXX | 0000–0999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - IL | 6115 | ELMHURST | IL |
| 2009-06-04 | 331-481-7XXX | 7000–7999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - IL | 6115 | DOWNERSGRV | IL |
| 2008-12-30 | 331-472-2XXX | 2000–2999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - IL | 6115 | NAPERVILLE | IL |
| 2008-11-17 | 331-422-0XXX | 0000–0999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - IL | 6115 | ST CHARLES | IL |
| 2008-04-30 | 331-425-6XXX | 6000–6999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - IL | 6115 | AURORA | IL |
| 2008-04-30 | 331-425-7XXX | 7000–7999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - IL | 6115 | AURORA | IL |
| 2007-08-24 | 331-684-0XXX | 0000–0999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - IL | 6115 | AURORA | IL |
Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.