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
2015-02-05 231-303-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E NEWAYGO MI
2014-12-19 231-655-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 MANISTEE MI
2014-12-18 231-767-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 MUSKEGON MI
2014-12-17 231-751-9XXX 9000–9999Assigned PEERLESS NETWORK OF MICHIGAN, LLC - MI 933G WALLOON LK MI
2014-12-17 231-819-9XXX 9000–9999Assigned PEERLESS NETWORK OF MICHIGAN, LLC - MI 933G TUSTIN MI
2014-12-01 231-774-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E INTERLOCHN MI
2014-11-10 231-787-0XXX 0000–0999Assigned ONVOY, LLCV - MI 543C WHITECLOUD MI
2014-11-10 231-787-1XXX 1000–1999Assigned ONVOY, LLCV - MI 543C WHITECLOUD MI
2014-10-16 231-828-1XXX 1000–1999Assigned ONVOY, LLCV - MI 543C TWIN LAKE MI
2014-10-15 231-819-0XXX 0000–0999Assigned ONVOY, LLCV - MI 543C TUSTIN MI
2014-10-15 231-819-1XXX 1000–1999Assigned ONVOY, LLCV - MI 543C TUSTIN MI
2014-10-14 231-676-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 BELLAIRE MI
2014-10-07 231-497-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 BOYNE CITY MI
2014-10-07 231-497-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 BOYNE CITY MI
2014-10-07 231-751-7XXX 7000–7999Assigned ONVOY, LLCV - MI 543C WALLOON LK MI
2014-10-07 231-819-7XXX 7000–7999Assigned ONVOY, LLCV - MI 543C TUSTIN MI
2014-10-01 231-265-8XXX 8000–8999Assigned ONVOY, LLCV - MI 543C CORAL MI
2014-10-01 231-434-7XXX 7000–7999Assigned ONVOY, LLCV - MI 543C MANTON MI
2014-10-01 231-674-7XXX 7000–7999Assigned ONVOY, LLCV - MI 543C GRANT MI
2014-10-01 231-685-7XXX 7000–7999Assigned ONVOY, LLCV - MI 543C RAVENNA MI
2014-10-01 231-758-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 PETOSKEY MI
2014-10-01 231-758-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 PETOSKEY MI
2014-10-01 231-758-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 PETOSKEY MI
2014-09-30 231-846-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CADILLAC MI
2014-09-30 231-846-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CADILLAC MI
2014-09-30 231-907-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LUDINGTON MI
2014-09-26 231-434-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MANTON MI
2014-09-26 231-434-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MANTON MI
2014-09-26 231-685-1XXX 1000–1999Assigned CHARTER IP ENABLED SERVICES, LLC 792K RAVENNA MI
2014-09-18 231-299-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E MANISTEE MI
2014-09-05 231-292-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 WHITEHALL MI
2014-08-21 231-307-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E MORLEY MI
2014-08-20 231-375-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 MUSKEGON MI
2014-08-06 231-437-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E CHARLEVOIX MI
2014-08-05 231-403-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E WILLIAMSBG MI
2014-08-05 231-674-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E GRANT MI
2014-08-04 231-375-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 MUSKEGON MI
2014-07-11 231-437-6XXX 6000–6999Assigned CHARTER IP ENABLED SERVICES, LLC 792K CHARLEVOIX MI
2014-07-11 231-866-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 SUTTONSBAY MI
2014-06-25 231-445-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E CHEBOYGAN MI
2014-06-25 231-484-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E EASTJORDAN MI
2014-06-17 231-404-5XXX 5000–5999Assigned DAYSTARR LLC DBA DAYSTARR COMMUNICATIONS 993L STANWOOD MI
2014-06-17 231-660-9XXX 9000–9999Assigned DAYSTARR LLC DBA DAYSTARR COMMUNICATIONS 993L BIG RAPIDS MI
2014-06-17 231-791-5XXX 5000–5999Assigned DAYSTARR LLC DBA DAYSTARR COMMUNICATIONS 993L REED CITY MI
2014-06-17 231-803-1XXX 1000–1999Assigned DAYSTARR LLC DBA DAYSTARR COMMUNICATIONS 993L MORLEY MI
2014-06-17 231-937-1XXX 1000–1999Assigned DAYSTARR LLC DBA DAYSTARR COMMUNICATIONS 993L HOWARDCITY MI
2014-06-10 231-923-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 HART MI
2014-06-03 231-375-2XXX 2000–2999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7157 MUSKEGON MI
2014-05-19 231-265-1XXX 1000–1999Assigned CHARTER IP ENABLED SERVICES, LLC 792K CORAL MI
2014-04-14 231-886-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 KALKASKA 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.