NumberResearch Membership · Data 09/20/2026

Recent thousands-block assignments

7 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 231
NEW CINGULAR WIRELESS PCS, LLC - IL 2
EXIANT COMMUNICATIONS LLC 2
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 2
AHOI LLC 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
2018-04-11 231-468-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CADILLAC MI
2018-04-06 231-624-7XXX 7000–7999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7157 KALKASKA MI
2018-04-03 231-493-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 TRAVERSECY MI
2018-04-03 231-493-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 TRAVERSECY MI
2018-04-03 231-493-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 TRAVERSECY MI
2018-04-03 231-493-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 TRAVERSECY MI
2018-04-03 231-493-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 TRAVERSECY MI
2018-03-19 231-201-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E CHIPPEWALK MI
2018-03-19 231-685-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 RAVENNA MI
2018-03-19 231-685-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 RAVENNA MI
2018-03-19 231-888-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 TWIN LAKE MI
2018-03-19 231-888-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 TWIN LAKE MI
2018-03-13 231-495-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 BELLAIRE MI
2018-01-05 231-375-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 MUSKEGON MI
2017-11-21 231-666-0XXX 0000–0999Assigned ONVOY, LLCV - MI 543C MUSKEGON MI
2017-11-03 231-564-4XXX 4000–4999Assigned CHARTER IP ENABLED SERVICES, LLC 792K KALKASKA MI
2017-10-19 231-624-3XXX 3000–3999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 KALKASKA MI
2017-10-19 231-624-4XXX 4000–4999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 KALKASKA MI
2017-10-10 231-666-6XXX 6000–6999Assigned ONVOY, LLCV - MI 543C MUSKEGON MI
2017-10-02 231-787-6XXX 6000–6999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J WHITECLOUD MI
2017-10-02 231-800-0XXX 0000–0999Assigned ONVOY, LLCV - MI 543C LUTHER MI
2017-10-02 231-800-8XXX 8000–8999Assigned ONVOY, LLCV - MI 543C LUTHER MI
2017-09-08 231-300-0XXX 0000–0999Assigned ONVOY, LLCV - MI 543C ALDEN MI
2017-09-08 231-300-1XXX 1000–1999Assigned ONVOY, LLCV - MI 543C ALDEN MI
2017-09-08 231-300-2XXX 2000–2999Assigned ONVOY, LLCV - MI 543C ALDEN MI
2017-09-08 231-300-3XXX 3000–3999Assigned ONVOY, LLCV - MI 543C ALDEN MI
2017-09-01 231-241-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J PENTWATER MI
2017-09-01 231-259-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J SHELBY MI
2017-09-01 231-403-8XXX 8000–8999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J WILLIAMSBG MI
2017-09-01 231-819-6XXX 6000–6999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J TUSTIN MI
2017-09-01 231-925-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J SCOTTVILLE MI
2017-08-30 231-277-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J FOUNTAIN MI
2017-08-30 231-440-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 BALDWIN MI
2017-08-30 231-442-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J HARRIETTA MI
2017-08-30 231-450-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J HESPERIA MI
2017-08-30 231-464-3XXX 3000–3999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J FREESOIL MI
2017-08-30 231-480-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J LUDINGTON MI
2017-08-30 231-508-4XXX 4000–4999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J ONEKAMA MI
2017-08-30 231-651-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J BEULAH MI
2017-08-30 231-655-6XXX 6000–6999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J MANISTEE MI
2017-08-30 231-721-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J HART MI
2017-08-30 231-729-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J IRONS MI
2017-08-30 231-797-8XXX 8000–8999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J LUTHER MI
2017-08-30 231-886-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J KALKASKA MI
2017-08-10 231-939-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 PETOSKEY MI
2017-08-07 231-489-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 PETOSKEY MI
2017-07-31 231-223-5XXX 5000–5999Assigned CHARTER IP ENABLED SERVICES, LLC 792K OLDMISSION MI
2017-07-25 231-743-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MARION MI
2017-07-24 231-493-3XXX 3000–3999Assigned METROPCS, INC. 5562 TRAVERSECY MI
2017-07-24 231-493-4XXX 4000–4999Assigned METROPCS, INC. 5562 TRAVERSECY MI

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.