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
2004-12-29 231-498-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 ELK RAPIDS MI
2004-12-13 231-903-8XXX 8000–8999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 MUSKEGON MI
2004-11-15 231-747-3XXX 3000–3999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 MUSKEGON MI
2004-11-15 231-747-4XXX 4000–4999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 MUSKEGON MI
2004-10-22 231-498-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 ELK RAPIDS MI
2004-10-20 231-237-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 CHARLEVOIX MI
2004-10-18 231-267-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 WILLIAMSBG MI
2004-10-18 231-535-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 WALLOON LK MI
2004-10-18 231-903-9XXX 9000–9999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 MUSKEGON MI
2004-10-18 231-981-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 WHITEHALL MI
2004-10-14 231-242-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 HARBOR SPG MI
2004-10-14 231-256-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 LKLEELANAU MI
2004-10-14 231-276-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 INTERLOCHN MI
2004-10-14 231-389-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 HARRIETTA MI
2004-10-14 231-539-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 PELLSTON MI
2004-10-14 231-821-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 HOLTON MI
2004-10-14 231-824-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 MANTON MI
2004-10-14 231-825-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 MCBAIN MI
2004-10-14 231-828-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 TWIN LAKE MI
2004-10-14 231-853-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 RAVENNA MI
2004-10-05 231-534-8XXX 8000–8999Assigned MICHIGAN BELL TEL CO 9323 TRAVERSECY MI
2004-10-04 231-794-8XXX 8000–8999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 MANISTEE MI
2004-09-24 231-222-1XXX 1000–1999Assigned ACD TELECOM, INC. - MI 3535 EASTJORDAN MI
2004-09-24 231-237-3XXX 3000–3999Assigned ACD TELECOM, INC. - MI 3535 CHARLEVOIX MI
2004-09-24 231-264-1XXX 1000–1999Assigned ACD TELECOM, INC. - MI 3535 ELK RAPIDS MI
2004-09-24 231-331-0XXX 0000–0999Assigned ACD TELECOM, INC. - MI 3535 ALDEN MI
2004-09-24 231-333-2XXX 2000–2999Assigned ACD TELECOM, INC. - MI 3535 CHEBOYGAN MI
2004-09-24 231-354-1XXX 1000–1999Assigned ACD TELECOM, INC. - MI 3535 CORAL MI
2004-09-24 231-377-0XXX 0000–0999Assigned ACD TELECOM, INC. - MI 3535 CLAM RIVER MI
2004-09-24 231-392-5XXX 5000–5999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 TRAVERSECY MI
2004-09-24 231-459-0XXX 0000–0999Assigned ACD TELECOM, INC. - MI 3535 BOYNE CITY MI
2004-09-24 231-468-0XXX 0000–0999Assigned ACD TELECOM, INC. - MI 3535 CADILLAC MI
2004-09-24 231-533-0XXX 0000–0999Assigned ACD TELECOM, INC. - MI 3535 BELLAIRE MI
2004-09-24 231-544-0XXX 0000–0999Assigned ACD TELECOM, INC. - MI 3535 CENTRAL LK MI
2004-09-24 231-588-0XXX 0000–0999Assigned ACD TELECOM, INC. - MI 3535 ELLSWORTH MI
2004-09-24 231-599-0XXX 0000–0999Assigned ACD TELECOM, INC. - MI 3535 EASTPORT MI
2004-09-24 231-629-3XXX 3000–3999Assigned ACD TELECOM, INC. - MI 3535 BIG RAPIDS MI
2004-09-24 231-930-1XXX 1000–1999Assigned ACD TELECOM, INC. - MI 3535 BEULAH MI
2004-09-24 231-970-4XXX 4000–4999Assigned ACD TELECOM, INC. - MI 3535 BEAR LAKE MI
2004-09-17 231-571-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MUSKEGON MI
2004-09-17 231-571-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MUSKEGON MI
2004-08-25 231-944-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 TRAVERSECY MI
2004-08-25 231-944-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 TRAVERSECY MI
2004-08-25 231-944-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 TRAVERSECY MI
2004-07-16 231-668-3XXX 3000–3999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 TRAVERSECY MI
2004-07-15 231-747-2XXX 2000–2999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 MUSKEGON MI
2004-06-22 231-352-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 FRANKFORT MI
2004-06-22 231-432-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 NORTHPORT MI
2004-06-22 231-436-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 MACKINAWCY MI
2004-06-22 231-518-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 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.