NumberResearch Membership · Data 09/19/2026

Recent thousands-block assignments

25 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/19/2026

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
2011-03-30 501-203-4XXX 4000–4999Assigned AT&T ENTERPRISES, LLC 516C SEARCY AR
2011-03-30 501-226-3XXX 3000–3999Assigned AT&T ENTERPRISES, LLC 516C JESSIEVL AR
2011-03-30 501-365-7XXX 7000–7999Assigned AT&T ENTERPRISES, LLC 516C HEBER SPG AR
2011-03-30 501-438-8XXX 8000–8999Assigned AT&T ENTERPRISES, LLC 516C LONOKE AR
2011-03-30 501-594-6XXX 6000–6999Assigned AT&T ENTERPRISES, LLC 516C PARON AR
2011-03-30 501-669-4XXX 4000–4999Assigned AT&T ENTERPRISES, LLC 516C CLEVELAND AR
2011-03-30 501-701-4XXX 4000–4999Assigned AT&T ENTERPRISES, LLC 516C HOTSPRINGS AR
2011-03-30 501-815-8XXX 8000–8999Assigned AT&T ENTERPRISES, LLC 516C JONESMILLS AR
2011-03-30 501-825-2XXX 2000–2999Assigned AT&T ENTERPRISES, LLC 516C GREERSFRRY AR
2011-03-30 501-939-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C LONSDALE AR
2011-03-30 501-991-2XXX 2000–2999Assigned AT&T ENTERPRISES, LLC 516C CRYSTALSPG AR
2011-03-29 501-557-4XXX 4000–4999Assigned AT&T ENTERPRISES, LLC 516C BAUXITE AR
2011-03-28 501-210-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 LITTLEROCK AR
2011-03-28 501-210-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 LITTLEROCK AR
2011-03-28 501-218-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 LITTLEROCK AR
2011-03-28 501-235-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 LITTLEROCK AR
2011-03-28 501-235-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 LITTLEROCK AR
2011-03-28 501-255-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 LITTLEROCK AR
2011-03-28 501-400-1XXX 1000–1999Assigned PAETEC ITEL, LLC 829J LITTLEROCK AR
2011-03-25 501-550-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - AR 5179 GREERSFRRY AR
2011-03-25 501-840-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 BENTON AR
2011-03-23 501-859-8XXX 8000–8999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - AR 802C LITTLEROCK AR
2011-03-21 501-232-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C BEEBE AR
2011-03-21 501-261-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C SPRINGLAKE AR
2011-03-21 501-477-3XXX 3000–3999Assigned AT&T ENTERPRISES, LLC 516C MORRILTON AR
2011-03-21 501-893-4XXX 4000–4999Assigned AT&T ENTERPRISES, LLC 516C CENTER RDG AR
2011-03-04 501-584-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 LITTLEROCK AR
2011-03-04 501-584-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 LITTLEROCK AR
2011-03-04 501-614-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 LITTLEROCK AR
2011-02-25 501-286-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CABOT AR
2011-02-24 501-218-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LITTLEROCK AR
2011-02-24 501-218-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LITTLEROCK AR
2011-02-24 501-218-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LITTLEROCK AR
2011-02-24 501-218-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LITTLEROCK AR
2011-02-24 501-504-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CONWAY AR
2011-02-24 501-504-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CONWAY AR
2011-02-24 501-757-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AR 6805 CLINTON AR
2011-02-21 501-392-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - AR 196F SYVNHLSHWD AR
2011-02-21 501-499-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - AR 5179 CONWAY AR
2011-02-14 501-420-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 LITTLEROCK AR
2011-02-14 501-420-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 LITTLEROCK AR
2011-02-14 501-476-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 LITTLEROCK AR
2011-02-14 501-476-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 LITTLEROCK AR
2011-02-14 501-554-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 LITTLEROCK AR
2011-02-09 501-463-5XXX 5000–5999Assigned WINDSTREAM COMMUNICATIONS, INC. - AR 7656 HOTSPRINGS AR
2011-01-19 501-420-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - AR 196F LITTLEROCK AR
2011-01-19 501-420-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - AR 196F LITTLEROCK AR
2011-01-19 501-420-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - AR 196F LITTLEROCK AR
2011-01-17 501-786-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LITTLEROCK AR
2011-01-17 501-786-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LITTLEROCK AR

Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.