NumberResearch Membership · Data 09/20/2026

Recent thousands-block assignments

0 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, all time — NPA 928
CSC VOICE, LLC 50
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
2018-01-05 928-770-0XXX 0000–0999Assigned CSC VOICE, LLC 612K MOHAVE VLY AZ
2014-06-10 928-662-6XXX 6000–6999Assigned CSC VOICE, LLC 612K PARKER DAM AZ
2014-02-26 928-575-1XXX 1000–1999Assigned CSC VOICE, LLC 612K PARKER AZ
2014-02-26 928-923-5XXX 5000–5999Assigned CSC VOICE, LLC 612K EHRENBERG AZ
2014-02-11 928-299-2XXX 2000–2999Assigned CSC VOICE, LLC 612K BULLHEADCY AZ
2014-02-11 928-299-3XXX 3000–3999Assigned CSC VOICE, LLC 612K BULLHEADCY AZ
2014-02-11 928-299-4XXX 4000–4999Assigned CSC VOICE, LLC 612K BULLHEADCY AZ
2014-02-11 928-299-5XXX 5000–5999Assigned CSC VOICE, LLC 612K BULLHEADCY AZ
2014-02-11 928-529-2XXX 2000–2999Assigned CSC VOICE, LLC 612K KINGMAN AZ
2014-02-11 928-529-3XXX 3000–3999Assigned CSC VOICE, LLC 612K KINGMAN AZ
2014-02-11 928-529-4XXX 4000–4999Assigned CSC VOICE, LLC 612K KINGMAN AZ
2014-02-11 928-529-5XXX 5000–5999Assigned CSC VOICE, LLC 612K KINGMAN AZ
2014-02-04 928-363-1XXX 1000–1999Assigned CSC VOICE, LLC 612K PAYSON AZ
2014-02-04 928-363-4XXX 4000–4999Assigned CSC VOICE, LLC 612K PAYSON AZ
2014-02-04 928-404-2XXX 2000–2999Assigned CSC VOICE, LLC 612K BULLHDCYN AZ
2014-02-04 928-404-6XXX 6000–6999Assigned CSC VOICE, LLC 612K BULLHDCYN AZ
2014-02-04 928-577-2XXX 2000–2999Assigned CSC VOICE, LLC 612K MOHAVE VLY AZ
2014-02-04 928-764-5XXX 5000–5999Assigned CSC VOICE, LLC 612K CASTLEROCK AZ
2014-02-04 928-862-2XXX 2000–2999Assigned CSC VOICE, LLC 612K SEDONA AZ
2014-02-04 928-862-3XXX 3000–3999Assigned CSC VOICE, LLC 612K SEDONA AZ
2014-02-04 928-862-4XXX 4000–4999Assigned CSC VOICE, LLC 612K SEDONA AZ
2013-11-06 928-440-3XXX 3000–3999Assigned CSC VOICE, LLC 612K FLAGSTAFF AZ
2013-11-06 928-440-4XXX 4000–4999Assigned CSC VOICE, LLC 612K FLAGSTAFF AZ
2013-11-06 928-440-5XXX 5000–5999Assigned CSC VOICE, LLC 612K FLAGSTAFF AZ
2013-11-06 928-733-1XXX 1000–1999Assigned CSC VOICE, LLC 612K LKHAVASUCY AZ
2013-11-06 928-733-2XXX 2000–2999Assigned CSC VOICE, LLC 612K LKHAVASUCY AZ
2013-11-06 928-733-3XXX 3000–3999Assigned CSC VOICE, LLC 612K LKHAVASUCY AZ
2013-11-06 928-733-4XXX 4000–4999Assigned CSC VOICE, LLC 612K LKHAVASUCY AZ
2013-11-06 928-733-5XXX 5000–5999Assigned CSC VOICE, LLC 612K LKHAVASUCY AZ
2013-11-06 928-733-6XXX 6000–6999Assigned CSC VOICE, LLC 612K LKHAVASUCY AZ
2013-07-25 928-478-2XXX 2000–2999Assigned CSC VOICE, LLC 612K PAYSON AZ
2013-04-29 928-554-1XXX 1000–1999Assigned CSC VOICE, LLC 612K SEDONA AZ
2013-04-04 928-302-3XXX 3000–3999Assigned CSC VOICE, LLC 612K LKHAVASUCY AZ
2007-12-21 928-302-1XXX 1000–1999Assigned CSC VOICE, LLC 612K LKHAVASUCY AZ
2007-11-28 928-219-5XXX 5000–5999Assigned CSC VOICE, LLC 612K BULLHEADCY AZ
2007-10-17 928-263-1XXX 1000–1999Assigned CSC VOICE, LLC 612K KINGMAN AZ
2007-08-01 928-266-1XXX 1000–1999Assigned CSC VOICE, LLC 612K FLAGSTAFF AZ
2007-02-22 928-566-1XXX 1000–1999Assigned CSC VOICE, LLC 612K LKHAVASUCY AZ
2007-01-10 928-219-4XXX 4000–4999Assigned CSC VOICE, LLC 612K BULLHEADCY AZ
2006-11-21 928-565-1XXX 1000–1999Assigned CSC VOICE, LLC 612K KINGMAN AZ
2005-04-29 928-554-4XXX 4000–4999Assigned CSC VOICE, LLC 612K SEDONA AZ
2005-04-13 928-478-6XXX 6000–6999Assigned CSC VOICE, LLC 612K PAYSON AZ
2005-04-12 928-404-4XXX 4000–4999Assigned CSC VOICE, LLC 612K BULLHDCYN AZ
2005-04-12 928-566-4XXX 4000–4999Assigned CSC VOICE, LLC 612K LKHAVASUCY AZ
2005-04-12 928-770-4XXX 4000–4999Assigned CSC VOICE, LLC 612K MOHAVE VLY AZ
2005-03-14 928-377-3XXX 3000–3999Assigned CSC VOICE, LLC 612K KINGMAN AZ
2005-03-14 928-466-9XXX 9000–9999Assigned CSC VOICE, LLC 612K CASTLEROCK AZ
2005-03-11 928-667-5XXX 5000–5999Assigned CSC VOICE, LLC 612K PARKER DAM AZ
2005-03-08 928-444-4XXX 4000–4999Assigned CSC VOICE, LLC 612K BULLHEADCY AZ
2005-03-08 928-575-4XXX 4000–4999Assigned CSC VOICE, LLC 612K PARKER AZ

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.