NumberResearch Membership · Data 09/21/2026

Recent thousands-block assignments

0 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/21/2026

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, all time — NPA 551
FRACTEL, LLC 19
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
2021-10-26 551-366-6XXX 6000–6999Assigned FRACTEL, LLC 965H ENGLEWOOD NJ
2021-08-13 551-899-9XXX 9000–9999Assigned FRACTEL, LLC 965H HASBROKHTS NJ
2021-08-11 551-755-5XXX 5000–5999Assigned FRACTEL, LLC 965H CLOSTER NJ
2021-08-11 551-955-5XXX 5000–5999Assigned FRACTEL, LLC 965H WYCKOFF NJ
2021-04-02 551-842-5XXX 5000–5999Assigned FRACTEL, LLC 965H JERSEYCITY NJ
2020-10-15 551-348-6XXX 6000–6999Assigned FRACTEL, LLC 965H LEONIA NJ
2020-10-15 551-388-8XXX 8000–8999Assigned FRACTEL, LLC 965H BAYONNE NJ
2020-10-15 551-786-7XXX 7000–7999Assigned FRACTEL, LLC 965H UNION CITY NJ
2020-10-15 551-946-3XXX 3000–3999Assigned FRACTEL, LLC 965H HACKENSACK NJ
2020-05-26 551-600-0XXX 0000–0999Assigned FRACTEL, LLC 965H WYCKOFF NJ
2020-05-26 551-600-6XXX 6000–6999Assigned FRACTEL, LLC 965H WYCKOFF NJ
2020-02-18 551-336-8XXX 8000–8999Assigned FRACTEL, LLC 965H HACKENSACK NJ
2020-02-18 551-345-6XXX 6000–6999Assigned FRACTEL, LLC 965H HASBROKHTS NJ
2020-02-18 551-356-7XXX 7000–7999Assigned FRACTEL, LLC 965H KEARNY NJ
2020-02-18 551-356-9XXX 9000–9999Assigned FRACTEL, LLC 965H KEARNY NJ
2020-02-18 551-465-8XXX 8000–8999Assigned FRACTEL, LLC 965H LEONIA NJ
2020-02-18 551-529-3XXX 3000–3999Assigned FRACTEL, LLC 965H UNION CITY NJ
2020-02-18 551-529-9XXX 9000–9999Assigned FRACTEL, LLC 965H UNION CITY NJ
2020-02-18 551-758-6XXX 6000–6999Assigned FRACTEL, LLC 965H JERSEYCITY NJ

Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/21/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.