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
2017-06-12 231-252-9XXX 9000–9999Assigned CHARTER IP ENABLED SERVICES, LLC 792K TRAVERSECY MI
2017-06-02 231-489-8XXX 8000–8999Assigned CHARTER IP ENABLED SERVICES, LLC 792K PETOSKEY MI
2017-06-01 231-252-8XXX 8000–8999Assigned CHARTER IP ENABLED SERVICES, LLC 792K TRAVERSECY MI
2017-05-22 231-260-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 MUSKEGON MI
2017-05-22 231-260-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 MUSKEGON MI
2017-05-22 231-260-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 MUSKEGON MI
2017-05-17 231-394-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 MOORESTOWN MI
2017-05-17 231-493-9XXX 9000–9999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 TRAVERSECY MI
2017-05-17 231-640-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 LAKE ANN MI
2017-05-17 231-970-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 BEAR LAKE MI
2017-05-12 231-252-5XXX 5000–5999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 TRAVERSECY MI
2017-05-12 231-252-6XXX 6000–6999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 TRAVERSECY MI
2017-04-27 231-239-7XXX 7000–7999Assigned ONVOY, LLCV - MI 543C LUDINGTON MI
2017-04-27 231-241-2XXX 2000–2999Assigned ONVOY, LLCV - MI 543C PENTWATER MI
2017-04-26 231-434-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MANTON MI
2017-04-26 231-833-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 WOLVERINE MI
2017-04-25 231-252-2XXX 2000–2999Assigned CHARTER IP ENABLED SERVICES, LLC 792K TRAVERSECY MI
2017-04-25 231-252-3XXX 3000–3999Assigned CHARTER IP ENABLED SERVICES, LLC 792K TRAVERSECY MI
2017-04-20 231-450-6XXX 6000–6999Assigned ONVOY, LLCV - MI 543C HESPERIA MI
2017-04-20 231-594-6XXX 6000–6999Assigned ONVOY, LLCV - MI 543C HART MI
2017-04-20 231-636-2XXX 2000–2999Assigned ONVOY, LLCV - MI 543C HOWARDCITY MI
2017-03-22 231-246-7XXX 7000–7999Assigned COMCAST IP PHONE, LLC 318J MUSKEGON MI
2017-03-08 231-707-0XXX 0000–0999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 NEWAYGO MI
2017-03-07 231-260-6XXX 6000–6999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 MUSKEGON MI
2017-03-07 231-260-7XXX 7000–7999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 MUSKEGON MI
2017-03-07 231-260-8XXX 8000–8999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 MUSKEGON MI
2017-03-07 231-260-9XXX 9000–9999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 MUSKEGON MI
2017-02-27 231-246-5XXX 5000–5999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 MUSKEGON MI
2017-02-27 231-246-6XXX 6000–6999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 MUSKEGON MI
2017-02-15 231-882-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 BEULAH MI
2017-01-17 231-216-2XXX 2000–2999Assigned ONVOY, LLCV - MI 543C FRANKFORT MI
2017-01-09 231-246-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J MUSKEGON MI
2016-12-13 231-246-9XXX 9000–9999Assigned CHARTER IP ENABLED SERVICES, LLC 792K MUSKEGON MI
2016-12-08 231-898-7XXX 7000–7999Assigned CHARTER IP ENABLED SERVICES, LLC 792K CARR MI
2016-11-17 231-819-5XXX 5000–5999Assigned PEERLESS NETWORK OF MICHIGAN, LLC - MI 933G TUSTIN MI
2016-11-08 231-386-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 NORTHPORT MI
2016-10-17 231-246-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 MUSKEGON MI
2016-10-10 231-221-1XXX 1000–1999Assigned 123.NET, LLC 2550 HARBOR SPG MI
2016-09-26 231-545-9XXX 9000–9999Assigned CHARTER IP ENABLED SERVICES, LLC 792K BOYNEFALLS MI
2016-09-22 231-655-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 MANISTEE MI
2016-09-21 231-844-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E INDIAN RIV MI
2016-09-13 231-444-8XXX 8000–8999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J CADILLAC MI
2016-09-13 231-598-5XXX 5000–5999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J BIG RAPIDS MI
2016-09-13 231-680-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J REED CITY MI
2016-09-12 231-427-3XXX 3000–3999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E MACKINAWCY MI
2016-09-12 231-508-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E ONEKAMA MI
2016-09-06 231-246-1XXX 1000–1999Assigned PEERLESS NETWORK OF MICHIGAN, LLC - MI 933G MUSKEGON MI
2016-08-19 231-970-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 BEAR LAKE MI
2016-08-16 231-907-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LUDINGTON MI
2016-08-15 231-444-7XXX 7000–7999Assigned CLEAR RATE COMMUNICATIONS, LLC 046L CADILLAC 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.