NumberResearch Membership · Data 09/19/2026

Recent thousands-block assignments

7 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/19/2026

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
2008-09-18 231-450-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 HESPERIA MI
2008-09-10 231-527-4XXX 4000–4999Assigned FIRST COMMUNICATIONS, LLC 460K BIG RAPIDS MI
2008-09-08 231-944-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 TRAVERSECY MI
2008-09-08 231-944-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 TRAVERSECY MI
2008-09-05 231-350-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 BELLAIRE MI
2008-09-05 231-399-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 FRANKFORT MI
2008-09-05 231-879-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 FIFE LAKE MI
2008-08-28 231-760-4XXX 4000–4999Assigned COMCAST IP PHONE, LLC 318J MUSKEGON MI
2008-08-28 231-760-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J MUSKEGON MI
2008-08-28 231-760-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J MUSKEGON MI
2008-08-20 231-942-7XXX 7000–7999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E CADILLAC MI
2008-08-15 231-539-3XXX 3000–3999Assigned CHARTER IP ENABLED SERVICES, LLC 792K PELLSTON MI
2008-08-15 231-588-1XXX 1000–1999Assigned CHARTER IP ENABLED SERVICES, LLC 792K ELLSWORTH MI
2008-08-08 231-518-7XXX 7000–7999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E KALKASKA MI
2008-08-05 231-384-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 KALKASKA MI
2008-08-05 231-425-4XXX 4000–4999Assigned CHARTER IP ENABLED SERVICES, LLC 792K LUDINGTON MI
2008-08-01 231-613-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 SCOTTVILLE MI
2008-07-22 231-421-5XXX 5000–5999Assigned CHARTER IP ENABLED SERVICES, LLC 792K TRAVERSECY MI
2008-07-14 231-268-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHEBOYGAN MI
2008-07-14 231-268-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHEBOYGAN MI
2008-06-10 231-486-1XXX 1000–1999Assigned FIRST COMMUNICATIONS, LLC 460K TRAVERSECY MI
2008-06-10 231-760-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MUSKEGON MI
2008-06-06 231-944-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 TRAVERSECY MI
2008-06-05 231-239-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 LUDINGTON MI
2008-06-04 231-508-0XXX 0000–0999Assigned KALEVA TELEPHONE COMPANY - MI 392F ONEKAMA MI
2008-05-30 231-887-6XXX 6000–6999Assigned KALEVA TELEPHONE COMPANY - MI 392F MANISTEE MI
2008-04-28 231-307-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 MORLEY MI
2008-04-28 231-307-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 MORLEY MI
2008-04-28 231-459-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 BOYNE CITY MI
2008-04-28 231-676-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 BELLAIRE MI
2008-04-15 231-515-1XXX 1000–1999Assigned CHARTER IP ENABLED SERVICES, LLC 792K EVART MI
2008-04-11 231-564-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 KALKASKA MI
2008-04-07 231-373-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 PETOSKEY MI
2008-04-07 231-373-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 PETOSKEY MI
2008-04-07 231-373-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 PETOSKEY MI
2008-03-06 231-747-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J MUSKEGON MI
2008-03-06 231-747-7XXX 7000–7999Assigned COMCAST IP PHONE, LLC 318J MUSKEGON MI
2008-03-06 231-747-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J MUSKEGON MI
2008-03-06 231-747-9XXX 9000–9999Assigned COMCAST IP PHONE, LLC 318J MUSKEGON MI
2008-03-03 231-742-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 HART MI
2008-02-27 231-238-2XXX 2000–2999Assigned CHARTER IP ENABLED SERVICES, LLC 792K INDIAN RIV MI
2008-02-27 231-268-3XXX 3000–3999Assigned CHARTER IP ENABLED SERVICES, LLC 792K CHEBOYGAN MI
2008-02-27 231-436-6XXX 6000–6999Assigned CHARTER IP ENABLED SERVICES, LLC 792K MACKINAWCY MI
2008-02-26 231-872-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 REED CITY MI
2008-02-14 231-259-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 SHELBY MI
2008-02-12 231-421-3XXX 3000–3999Assigned CHARTER IP ENABLED SERVICES, LLC 792K TRAVERSECY MI
2008-02-07 231-672-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MUSKEGON MI
2008-01-31 231-242-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 HARBOR SPG MI
2008-01-31 231-720-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 MUSKEGON MI
2008-01-11 231-452-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J NEWAYGO MI

Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.