NumberResearchRecent thousands-block assignments
0 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/22/2026
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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| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2018-09-12 | 551-557-1XXX | 1000–1999 | Assigned | BLUEBIRD COMMUNICATIONS, LLC - NJ | 999H | PARK RIDGE | NJ |
| 2018-09-07 | 551-210-0XXX | 0000–0999 | Assigned | BLUEBIRD COMMUNICATIONS, LLC - NJ | 999H | DUMONT | NJ |
| 2018-09-07 | 551-212-2XXX | 2000–2999 | Assigned | BLUEBIRD COMMUNICATIONS, LLC - NJ | 999H | TEANECK | NJ |
| 2018-09-07 | 551-230-5XXX | 5000–5999 | Assigned | BLUEBIRD COMMUNICATIONS, LLC - NJ | 999H | ENGLEWOOD | NJ |
| 2018-09-07 | 551-231-4XXX | 4000–4999 | Assigned | BLUEBIRD COMMUNICATIONS, LLC - NJ | 999H | OAKLAND | NJ |
| 2018-09-07 | 551-239-5XXX | 5000–5999 | Assigned | BLUEBIRD COMMUNICATIONS, LLC - NJ | 999H | CLIFFSIDE | NJ |
| 2018-09-07 | 551-250-2XXX | 2000–2999 | Assigned | BLUEBIRD COMMUNICATIONS, LLC - NJ | 999H | FAIR LAWN | NJ |
| 2018-09-07 | 551-272-2XXX | 2000–2999 | Assigned | BLUEBIRD COMMUNICATIONS, LLC - NJ | 999H | LEONIA | NJ |
| 2018-09-07 | 551-279-5XXX | 5000–5999 | Assigned | BLUEBIRD COMMUNICATIONS, LLC - NJ | 999H | RAMSEY | NJ |
| 2018-09-07 | 551-280-1XXX | 1000–1999 | Assigned | BLUEBIRD COMMUNICATIONS, LLC - NJ | 999H | JERSEYCITY | NJ |
| 2018-09-07 | 551-282-2XXX | 2000–2999 | Assigned | BLUEBIRD COMMUNICATIONS, LLC - NJ | 999H | WESTWOOD | NJ |
| 2018-09-07 | 551-284-5XXX | 5000–5999 | Assigned | BLUEBIRD COMMUNICATIONS, LLC - NJ | 999H | RIDGEWOOD | NJ |
| 2018-09-07 | 551-285-5XXX | 5000–5999 | Assigned | BLUEBIRD COMMUNICATIONS, LLC - NJ | 999H | RUTHERFORD | NJ |
| 2018-09-07 | 551-286-6XXX | 6000–6999 | Assigned | BLUEBIRD COMMUNICATIONS, LLC - NJ | 999H | HACKENSACK | NJ |
| 2018-09-07 | 551-300-5XXX | 5000–5999 | Assigned | BLUEBIRD COMMUNICATIONS, LLC - NJ | 999H | UNION CITY | NJ |
| 2018-09-07 | 551-319-3XXX | 3000–3999 | Assigned | BLUEBIRD COMMUNICATIONS, LLC - NJ | 999H | WYCKOFF | NJ |
| 2018-09-07 | 551-399-3XXX | 3000–3999 | Assigned | BLUEBIRD COMMUNICATIONS, LLC - NJ | 999H | BAYONNE | NJ |
| 2018-09-07 | 551-722-2XXX | 2000–2999 | Assigned | BLUEBIRD COMMUNICATIONS, LLC - NJ | 999H | HASBROKHTS | NJ |
Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/22/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.