NumberResearch Membership · Data 09/20/2026

Recent thousands-block assignments

25 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 501
ONVOY, LLC - AR 15
BANDWIDTH.COM CLEC, LLC - AR 5
CSC WIRELESS, LLC 2
NEW CINGULAR WIRELESS PCS, LLC - IL 1
MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AR 1
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
2005-07-06 501-554-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LITTLEROCK AR
2005-06-17 501-545-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AR 6805 HOTSPRINGS AR
2005-06-15 501-743-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AR 6805 CABOT AR
2005-05-05 501-392-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 SYVNHLSHWD AR
2005-05-04 501-542-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - AR 5179 SYVNHLSHWD AR
2005-04-13 501-747-1XXX 1000–1999Assigned AT&T ENTERPRISES, LLC 516C LITTLEROCK AR
2005-04-06 501-588-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - AR 5179 LITTLEROCK AR
2005-04-06 501-588-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - AR 5179 LITTLEROCK AR
2005-03-24 501-318-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 HOTSPRINGS AR
2005-03-24 501-318-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 HOTSPRINGS AR
2005-03-24 501-538-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 HOTSPRINGS AR
2005-03-23 501-366-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AR 6805 LITTLEROCK AR
2005-03-23 501-366-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AR 6805 LITTLEROCK AR
2005-03-23 501-366-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AR 6805 LITTLEROCK AR
2005-03-07 501-628-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CABOT AR
2005-03-07 501-628-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CABOT AR
2005-02-14 501-691-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 HEBER SPG AR
2005-02-14 501-691-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 HEBER SPG AR
2005-02-10 501-581-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 GREENBRIER AR
2005-02-03 501-326-6XXX 6000–6999Assigned WINDSTREAM COMMUNICATIONS, INC. - AR 7656 BENTON AR
2005-01-21 501-467-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MALVERN AR
2005-01-21 501-593-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 SEARCY AR
2005-01-21 501-593-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 SEARCY AR
2005-01-21 501-593-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 SEARCY AR
2005-01-21 501-860-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 BENTON AR
2005-01-21 501-860-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 BENTON AR
2005-01-06 501-339-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CONWAY AR
2005-01-06 501-339-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CONWAY AR
2005-01-06 501-339-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CONWAY AR
2004-12-30 501-442-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 LITTLEROCK AR
2004-12-30 501-442-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 LITTLEROCK AR
2004-12-15 501-436-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - AR 5179 SYVNHLSHWD AR
2004-12-02 501-538-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 HOTSPRINGS AR
2004-12-02 501-538-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 HOTSPRINGS AR
2004-11-02 501-748-8XXX 8000–8999Assigned WINDSTREAM COMMUNICATIONS, INC. - AR 7656 LITTLEROCK AR
2004-11-02 501-748-9XXX 9000–9999Assigned WINDSTREAM COMMUNICATIONS, INC. - AR 7656 LITTLEROCK AR
2004-10-06 501-588-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - AR 5179 LITTLEROCK AR
2004-08-04 501-303-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - AR 5179 BENTON AR
2004-08-04 501-358-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - AR 5179 CONWAY AR
2004-06-18 501-259-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CABOT AR
2004-06-18 501-259-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CABOT AR
2004-04-07 501-226-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - AR 5179 JESSIEVL AR
2004-03-26 501-538-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 HOTSPRINGS AR
2004-03-26 501-538-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 HOTSPRINGS AR
2004-03-26 501-538-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 HOTSPRINGS AR
2004-03-22 501-317-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 BENTON AR
2004-03-22 501-317-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 BENTON AR
2004-03-05 501-206-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 HEBER SPG AR
2004-03-05 501-206-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 HEBER SPG AR
2004-01-29 501-442-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 LITTLEROCK AR

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.