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
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2024-01-08 | 551-201-8XXX | 8000–8999 | Assigned | COMMIO, LLC | 939H | JERSEYCITY | NJ |
| 2024-01-08 | 551-201-9XXX | 9000–9999 | Assigned | COMMIO, LLC | 939H | JERSEYCITY | NJ |
| 2024-01-08 | 551-289-1XXX | 1000–1999 | Assigned | COMMIO, LLC | 939H | HACKENSACK | NJ |
| 2024-01-08 | 551-364-4XXX | 4000–4999 | Assigned | COMMIO, LLC | 939H | BAYONNE | NJ |
| 2024-01-08 | 551-364-5XXX | 5000–5999 | Assigned | COMMIO, LLC | 939H | BAYONNE | NJ |
| 2024-01-08 | 551-377-0XXX | 0000–0999 | Assigned | COMMIO, LLC | 939H | UNION CITY | NJ |
| 2024-01-08 | 551-377-1XXX | 1000–1999 | Assigned | COMMIO, LLC | 939H | UNION CITY | NJ |
| 2024-01-08 | 551-377-8XXX | 8000–8999 | Assigned | COMMIO, LLC | 939H | UNION CITY | NJ |
| 2024-01-08 | 551-386-0XXX | 0000–0999 | Assigned | COMMIO, LLC | 939H | RIDGEWOOD | NJ |
| 2024-01-08 | 551-386-1XXX | 1000–1999 | Assigned | COMMIO, LLC | 939H | RIDGEWOOD | NJ |
| 2024-01-08 | 551-386-2XXX | 2000–2999 | Assigned | COMMIO, LLC | 939H | RIDGEWOOD | NJ |
| 2024-01-08 | 551-386-8XXX | 8000–8999 | Assigned | COMMIO, LLC | 939H | RIDGEWOOD | NJ |
| 2024-01-08 | 551-387-8XXX | 8000–8999 | Assigned | COMMIO, LLC | 939H | JERSEYCITY | NJ |
| 2022-10-12 | 551-346-1XXX | 1000–1999 | Assigned | COMMIO, LLC | 939H | CLOSTER | NJ |
| 2021-09-23 | 551-329-0XXX | 0000–0999 | Assigned | COMMIO, LLC | 939H | RIDGEWOOD | NJ |
| 2021-09-23 | 551-329-1XXX | 1000–1999 | Assigned | COMMIO, LLC | 939H | RIDGEWOOD | NJ |
| 2021-09-23 | 551-329-2XXX | 2000–2999 | Assigned | COMMIO, LLC | 939H | RIDGEWOOD | NJ |
| 2021-09-15 | 551-837-0XXX | 0000–0999 | Assigned | COMMIO, LLC | 939H | HACKENSACK | NJ |
| 2021-09-15 | 551-837-1XXX | 1000–1999 | Assigned | COMMIO, LLC | 939H | HACKENSACK | NJ |
| 2021-09-15 | 551-837-3XXX | 3000–3999 | Assigned | COMMIO, LLC | 939H | HACKENSACK | NJ |
| 2021-09-15 | 551-837-8XXX | 8000–8999 | Assigned | COMMIO, LLC | 939H | HACKENSACK | NJ |
| 2021-08-10 | 551-323-0XXX | 0000–0999 | Assigned | COMMIO, LLC | 939H | UNION CITY | NJ |
| 2021-08-10 | 551-323-1XXX | 1000–1999 | Assigned | COMMIO, LLC | 939H | UNION CITY | NJ |
| 2021-08-10 | 551-323-6XXX | 6000–6999 | Assigned | COMMIO, LLC | 939H | UNION CITY | NJ |
| 2021-06-11 | 551-309-7XXX | 7000–7999 | Assigned | COMMIO, LLC | 939H | JERSEYCITY | NJ |
| 2021-06-11 | 551-430-3XXX | 3000–3999 | Assigned | COMMIO, LLC | 939H | JERSEYCITY | NJ |
| 2021-06-11 | 551-430-8XXX | 8000–8999 | Assigned | COMMIO, LLC | 939H | JERSEYCITY | NJ |
| 2021-06-11 | 551-842-0XXX | 0000–0999 | Assigned | COMMIO, LLC | 939H | JERSEYCITY | NJ |
| 2021-06-03 | 551-318-0XXX | 0000–0999 | Assigned | COMMIO, LLC | 939H | BAYONNE | NJ |
| 2021-06-03 | 551-318-1XXX | 1000–1999 | Assigned | COMMIO, LLC | 939H | BAYONNE | NJ |
| 2021-06-03 | 551-318-2XXX | 2000–2999 | Assigned | COMMIO, LLC | 939H | BAYONNE | 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.