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 551
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 |
|---|---|---|---|---|---|---|---|
| 2024-12-27 | 551-414-2XXX | 2000–2999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - NJ | 4804 | JERSEYCITY | NJ |
| 2024-07-17 | 551-310-7XXX | 7000–7999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - NJ | 4804 | WESTWOOD | NJ |
| 2023-12-28 | 551-374-6XXX | 6000–6999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - NJ | 4804 | DUMONT | NJ |
| 2020-08-11 | 551-529-7XXX | 7000–7999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - NJ | 4804 | UNION CITY | NJ |
| 2020-01-16 | 551-230-9XXX | 9000–9999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - NJ | 4804 | ENGLEWOOD | NJ |
| 2018-12-13 | 551-296-2XXX | 2000–2999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - NJ | 4804 | OAKLAND | NJ |
| 2018-12-13 | 551-308-2XXX | 2000–2999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - NJ | 4804 | RAMSEY | NJ |
| 2018-12-06 | 551-284-8XXX | 8000–8999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - NJ | 4804 | RIDGEWOOD | NJ |
| 2017-02-16 | 551-249-2XXX | 2000–2999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - NJ | 4804 | PARK RIDGE | NJ |
| 2016-03-17 | 551-267-6XXX | 6000–6999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - NJ | 4804 | JERSEYCITY | NJ |
| 2015-08-06 | 551-254-6XXX | 6000–6999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - NJ | 4804 | UNION CITY | NJ |
| 2015-07-21 | 551-229-4XXX | 4000–4999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - NJ | 4804 | JERSEYCITY | NJ |
| 2015-07-15 | 551-228-4XXX | 4000–4999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - NJ | 4804 | HACKENSACK | NJ |
| 2015-07-02 | 551-256-8XXX | 8000–8999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - NJ | 4804 | JERSEYCITY | NJ |
| 2014-10-03 | 551-233-2XXX | 2000–2999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - NJ | 4804 | JERSEYCITY | NJ |
| 2014-09-11 | 551-227-3XXX | 3000–3999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - NJ | 4804 | JERSEYCITY | NJ |
| 2014-09-11 | 551-227-4XXX | 4000–4999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - NJ | 4804 | JERSEYCITY | NJ |
| 2014-09-11 | 551-228-2XXX | 2000–2999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - NJ | 4804 | HACKENSACK | NJ |
| 2014-06-04 | 551-227-2XXX | 2000–2999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - NJ | 4804 | JERSEYCITY | NJ |
| 2014-04-08 | 551-500-2XXX | 2000–2999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - NJ | 4804 | RAMSEY | NJ |
| 2014-04-08 | 551-999-6XXX | 6000–6999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - NJ | 4804 | HACKENSACK | NJ |
| 2008-01-31 | 551-226-7XXX | 7000–7999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - NJ | 4804 | JERSEYCITY | NJ |
| 2008-01-31 | 551-226-8XXX | 8000–8999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - NJ | 4804 | JERSEYCITY | NJ |
| 2008-01-17 | 551-226-5XXX | 5000–5999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - NJ | 4804 | JERSEYCITY | NJ |
| 2008-01-17 | 551-226-6XXX | 6000–6999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - NJ | 4804 | JERSEYCITY | NJ |
| 2005-09-12 | 551-497-4XXX | 4000–4999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - NJ | 4804 | HACKENSACK | NJ |
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.