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
2011-12-06 501-313-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C LITTLEROCK AR
2011-11-30 501-237-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AR 7277 LONOKE AR
2011-11-30 501-483-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AR 7277 PALARM AR
2011-11-30 501-727-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AR 7277 MORRILTON AR
2011-11-30 501-915-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - AR 5179 JESSIEVL AR
2011-11-15 501-331-4XXX 4000–4999Assigned WINDSTREAM ARKANSAS, INC. 1691 PERRYVILLE AR
2011-11-15 501-402-4XXX 4000–4999Assigned WINDSTREAM ARKANSAS, INC. 1691 GREENBRIER AR
2011-10-28 501-422-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CABOT AR
2011-10-27 501-222-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - AR 196F WRIGHTSVL AR
2011-10-21 501-313-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J LITTLEROCK AR
2011-10-20 501-483-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - AR 5179 PALARM AR
2011-10-18 501-264-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 LITTLEROCK AR
2011-10-18 501-264-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 LITTLEROCK AR
2011-10-18 501-264-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 LITTLEROCK AR
2011-10-18 501-264-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 LITTLEROCK AR
2011-10-18 501-264-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 LITTLEROCK AR
2011-10-18 501-264-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 LITTLEROCK AR
2011-10-12 501-222-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C WRIGHTSVL AR
2011-10-12 501-267-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 MALVERN AR
2011-10-12 501-267-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 MALVERN AR
2011-10-12 501-267-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 MALVERN AR
2011-10-12 501-308-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 LITTLEROCK AR
2011-10-12 501-523-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C SCOTT AR
2011-10-11 501-322-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AR 6805 KENSETT AR
2011-10-06 501-308-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 LITTLEROCK AR
2011-10-06 501-308-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 LITTLEROCK AR
2011-10-06 501-308-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 LITTLEROCK AR
2011-10-06 501-308-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 LITTLEROCK AR
2011-10-05 501-229-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 MALVERN AR
2011-10-05 501-304-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 MALVERN AR
2011-10-05 501-304-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 MALVERN AR
2011-10-05 501-458-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 MALVERN AR
2011-10-05 501-499-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 CONWAY AR
2011-10-05 501-693-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 HOTSPRINGS AR
2011-10-05 501-693-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 HOTSPRINGS AR
2011-10-05 501-881-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 HOTSPRINGS AR
2011-10-03 501-260-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 LITTLEROCK AR
2011-10-03 501-260-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 LITTLEROCK AR
2011-10-03 501-260-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 LITTLEROCK AR
2011-10-03 501-260-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 LITTLEROCK AR
2011-10-03 501-487-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - AR 802C SYVNHLSHWD AR
2011-09-28 501-504-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CONWAY AR
2011-09-28 501-505-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CONWAY AR
2011-09-28 501-513-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CONWAY AR
2011-09-28 501-794-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 BENTON AR
2011-09-28 501-860-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 BENTON AR
2011-09-23 501-248-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 LITTLEROCK AR
2011-09-23 501-248-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 LITTLEROCK AR
2011-09-23 501-248-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 LITTLEROCK AR
2011-09-23 501-248-7XXX 7000–7999Assigned 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.