NumberResearch Membership · Data 09/20/2026

Recent thousands-block assignments

29 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/20/2026

Full prefixes (NXX) Thousands-blocks (1,000-number pools)

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, last 30 days — NPA 551
ONVOY, LLC - NJ 12
NEW CINGULAR WIRELESS PCS, LLC - DC 11
CSC WIRELESS, LLC 3
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NJ 3
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
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Recent thousands-block assignments
AssignedThousands-blockLast 4 digitsStatusAssigneeOCNRate centerState
2014-09-16 551-888-4XXX 4000–4999Assigned ONVOY, LLC - NJ 637C UNION CITY NJ
2014-09-11 551-227-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - NJ 4804 JERSEYCITY NJ
2014-09-11 551-227-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - NJ 4804 JERSEYCITY NJ
2014-09-11 551-228-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - NJ 4804 HACKENSACK NJ
2014-09-10 551-224-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NJ 6391 FAIR LAWN NJ
2014-09-10 551-224-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NJ 6391 FAIR LAWN NJ
2014-09-10 551-224-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NJ 6391 FAIR LAWN NJ
2014-09-10 551-224-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NJ 6391 FAIR LAWN NJ
2014-09-10 551-224-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NJ 6391 FAIR LAWN NJ
2014-09-10 551-224-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NJ 6391 FAIR LAWN NJ
2014-09-10 551-225-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NJ 6391 JERSEYCITY NJ
2014-09-10 551-225-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NJ 6391 JERSEYCITY NJ
2014-09-10 551-225-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NJ 6391 JERSEYCITY NJ
2014-09-10 551-500-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NJ 6391 RAMSEY NJ
2014-09-10 551-500-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NJ 6391 RAMSEY NJ
2014-09-10 551-500-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NJ 6391 RAMSEY NJ
2014-09-10 551-500-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NJ 6391 RAMSEY NJ
2014-09-09 551-224-1XXX 1000–1999Assigned OMNIPOINT COMMUNICATIONS, INC. - NJ 6623 FAIR LAWN NJ
2014-09-09 551-888-9XXX 9000–9999Assigned OMNIPOINT COMMUNICATIONS, INC. - NJ 6623 UNION CITY NJ
2014-09-04 551-227-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 JERSEYCITY NJ
2014-09-04 551-227-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 JERSEYCITY NJ
2014-09-02 551-228-0XXX 0000–0999Assigned ONVOY, LLC - NJ 637C HACKENSACK NJ
2014-09-02 551-228-1XXX 1000–1999Assigned ONVOY, LLC - NJ 637C HACKENSACK NJ
2014-08-27 551-225-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J JERSEYCITY NJ
2014-08-22 551-666-3XXX 3000–3999Assigned OMNIPOINT COMMUNICATIONS, INC. - NJ 6623 BAYONNE NJ
2014-08-22 551-666-7XXX 7000–7999Assigned OMNIPOINT COMMUNICATIONS, INC. - NJ 6623 BAYONNE NJ
2014-08-21 551-228-7XXX 7000–7999Assigned PAETEC ITEL, LLC 829J HACKENSACK NJ
2014-08-06 551-666-4XXX 4000–4999Assigned ONVOY, LLC - NJ 637C BAYONNE NJ
2014-07-28 551-223-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NJ 6391 FAIR LAWN NJ
2014-07-28 551-223-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NJ 6391 FAIR LAWN NJ
2014-07-23 551-227-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 JERSEYCITY NJ
2014-07-02 551-228-6XXX 6000–6999Assigned CABLEVISION LIGHTPATH, INC. - NJ 4948 HACKENSACK NJ
2014-06-04 551-223-7XXX 7000–7999Assigned OMNIPOINT COMMUNICATIONS, INC. - NJ 6623 FAIR LAWN NJ
2014-06-04 551-227-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - NJ 4804 JERSEYCITY NJ
2014-06-03 551-225-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - NJ 118F JERSEYCITY NJ
2014-06-03 551-225-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - NJ 118F JERSEYCITY NJ
2014-05-29 551-222-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - NJ 118F JERSEYCITY NJ
2014-05-29 551-222-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - NJ 118F JERSEYCITY NJ
2014-05-29 551-222-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - NJ 118F JERSEYCITY NJ
2014-05-22 551-587-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NJ 6391 HACKENSACK NJ
2014-05-22 551-999-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NJ 6391 HACKENSACK NJ
2014-05-22 551-999-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NJ 6391 HACKENSACK NJ
2014-05-20 551-224-0XXX 0000–0999Assigned ONVOY, LLC - NJ 637C FAIR LAWN NJ
2014-05-09 551-222-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NJ 6391 JERSEYCITY NJ
2014-05-09 551-222-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NJ 6391 JERSEYCITY NJ
2014-05-09 551-223-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NJ 6391 FAIR LAWN NJ
2014-05-09 551-223-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NJ 6391 FAIR LAWN NJ
2014-05-09 551-223-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NJ 6391 FAIR LAWN NJ
2014-05-09 551-223-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NJ 6391 FAIR LAWN NJ
2014-05-09 551-223-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NJ 6391 FAIR LAWN 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.