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
Clear Download CSV ↓
Recent thousands-block assignments
AssignedThousands-blockLast 4 digitsStatusAssigneeOCNRate centerState
2016-08-25 501-523-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - AR 196F SCOTT AR
2016-08-22 501-415-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - AR 196F LONOKE AR
2016-08-19 501-435-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 LITTLEROCK AR
2016-08-19 501-435-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 LITTLEROCK AR
2016-08-19 501-435-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 LITTLEROCK AR
2016-08-19 501-435-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 LITTLEROCK AR
2016-08-19 501-435-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 LITTLEROCK AR
2016-08-19 501-443-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 BENTON AR
2016-08-16 501-830-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - AR 802C FERNDALE AR
2016-08-15 501-575-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 BENTON AR
2016-08-15 501-575-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 BENTON AR
2016-08-15 501-891-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 LITTLEROCK AR
2016-08-15 501-891-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 LITTLEROCK AR
2016-08-15 501-914-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 LITTLEROCK AR
2016-07-27 501-478-6XXX 6000–6999Assigned AT&T ENTERPRISES, LLC 516C LITTLEROCK AR
2016-07-26 501-254-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 SEARCY AR
2016-07-26 501-254-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 SEARCY AR
2016-07-26 501-254-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 SEARCY AR
2016-07-26 501-406-9XXX 9000–9999Assigned E. RITTER COMMUNICATIONS, LLC 128L LITTLEROCK AR
2016-07-26 501-585-9XXX 9000–9999Assigned E. RITTER COMMUNICATIONS, LLC 128L CONWAY AR
2016-07-26 501-701-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 HOTSPRINGS AR
2016-07-26 501-781-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 HOTSPRINGS AR
2016-07-26 501-781-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 HOTSPRINGS AR
2016-07-20 501-800-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 PALARM AR
2016-07-20 501-800-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 PALARM AR
2016-07-07 501-574-6XXX 6000–6999Assigned AT&T ENTERPRISES, LLC 516C BENTON AR
2016-07-05 501-585-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AR 7277 CONWAY AR
2016-06-29 501-314-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - AR 196F GREENBRIER AR
2016-06-29 501-333-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - AR 196F MAUMELLE AR
2016-06-29 501-478-8XXX 8000–8999Assigned METROPCS, INC. 5562 LITTLEROCK AR
2016-06-29 501-891-7XXX 7000–7999Assigned METROPCS, INC. 5562 LITTLEROCK AR
2016-06-28 501-575-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - AR 5179 BENTON AR
2016-06-22 501-239-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - AR 196F BEEBE AR
2016-06-22 501-386-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - AR 196F CENTER RDG AR
2016-06-21 501-651-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 HOTSPRINGS AR
2016-06-21 501-651-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 HOTSPRINGS AR
2016-06-21 501-651-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 HOTSPRINGS AR
2016-06-21 501-651-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 HOTSPRINGS AR
2016-06-15 501-732-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MALVERN AR
2016-06-13 501-406-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - AR 196F LITTLEROCK AR
2016-06-13 501-436-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - AR 196F SYVNHLSHWD AR
2016-06-13 501-436-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - AR 196F SYVNHLSHWD AR
2016-06-13 501-651-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - AR 196F HOTSPRINGS AR
2016-06-13 501-888-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - AR 196F SPRINGLAKE AR
2016-06-08 501-904-1XXX 1000–1999Assigned COMCAST IP PHONE, LLC 318J LITTLEROCK AR
2016-06-08 501-904-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J LITTLEROCK AR
2016-06-08 501-904-7XXX 7000–7999Assigned COMCAST IP PHONE, LLC 318J LITTLEROCK AR
2016-05-27 501-294-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J MORGANTON AR
2016-05-23 501-575-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 BENTON AR
2016-05-23 501-575-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 BENTON 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.