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
2014-04-04 231-486-6XXX 6000–6999Assigned CHARTER IP ENABLED SERVICES, LLC 792K TRAVERSECY MI
2014-03-07 231-780-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 MUSKEGON MI
2014-02-26 231-335-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E FREMONT MI
2014-02-24 231-375-3XXX 3000–3999Assigned METROPCS, INC. 5562 MUSKEGON MI
2014-02-24 231-375-4XXX 4000–4999Assigned METROPCS, INC. 5562 MUSKEGON MI
2014-01-28 231-303-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E NEWAYGO MI
2014-01-22 231-375-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J MUSKEGON MI
2014-01-14 231-760-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 MUSKEGON MI
2013-10-15 231-403-5XXX 5000–5999Assigned PAETEC ITEL, LLC 829J WILLIAMSBG MI
2013-10-10 231-386-3XXX 3000–3999Assigned AT&T ENTERPRISES, LLC 516C NORTHPORT MI
2013-09-20 231-923-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 HART MI
2013-09-19 231-638-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 MUSKEGON MI
2013-08-08 231-484-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E EASTJORDAN MI
2013-07-11 231-256-5XXX 5000–5999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E LKLEELANAU MI
2013-07-11 231-432-4XXX 4000–4999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E NORTHPORT MI
2013-07-11 231-497-2XXX 2000–2999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E BOYNE CITY MI
2013-07-11 231-538-5XXX 5000–5999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E FREMONT MI
2013-07-11 231-676-5XXX 5000–5999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E BELLAIRE MI
2013-07-11 231-680-3XXX 3000–3999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E REED CITY MI
2013-07-11 231-923-7XXX 7000–7999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E HART MI
2013-07-01 231-486-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E TRAVERSECY MI
2013-06-28 231-299-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 MANISTEE MI
2013-06-13 231-487-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 PETOSKEY MI
2013-06-05 231-412-6XXX 6000–6999Assigned CHARTER IP ENABLED SERVICES, LLC 792K HARBOR SPG MI
2013-06-05 231-798-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 MUSKEGON MI
2013-05-28 231-943-2XXX 2000–2999Assigned CHARTER IP ENABLED SERVICES, LLC 792K TRAVERSECY MI
2013-05-07 231-881-9XXX 9000–9999Assigned CHARTER IP ENABLED SERVICES, LLC 792K PETOSKEY MI
2013-05-06 231-766-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J MUSKEGON MI
2013-03-20 231-264-7XXX 7000–7999Assigned ONVOY, LLCV - MI 543C ELK RAPIDS MI
2013-03-20 231-331-8XXX 8000–8999Assigned ONVOY, LLCV - MI 543C ALDEN MI
2013-03-20 231-377-8XXX 8000–8999Assigned ONVOY, LLCV - MI 543C CLAM RIVER MI
2013-03-20 231-383-8XXX 8000–8999Assigned ONVOY, LLCV - MI 543C BEULAH MI
2013-03-20 231-399-8XXX 8000–8999Assigned ONVOY, LLCV - MI 543C FRANKFORT MI
2013-03-20 231-437-5XXX 5000–5999Assigned ONVOY, LLCV - MI 543C CHARLEVOIX MI
2013-03-20 231-462-5XXX 5000–5999Assigned ONVOY, LLCV - MI 543C FOUNTAIN MI
2013-03-20 231-497-7XXX 7000–7999Assigned ONVOY, LLCV - MI 543C BOYNE CITY MI
2013-03-20 231-515-8XXX 8000–8999Assigned ONVOY, LLCV - MI 543C EVART MI
2013-03-20 231-533-2XXX 2000–2999Assigned ONVOY, LLCV - MI 543C BELLAIRE MI
2013-03-20 231-536-8XXX 8000–8999Assigned ONVOY, LLCV - MI 543C EASTJORDAN MI
2013-03-20 231-570-5XXX 5000–5999Assigned ONVOY, LLCV - MI 543C FIFE LAKE MI
2013-03-20 231-588-7XXX 7000–7999Assigned ONVOY, LLCV - MI 543C ELLSWORTH MI
2013-03-20 231-597-5XXX 5000–5999Assigned ONVOY, LLCV - MI 543C CHEBOYGAN MI
2013-03-20 231-598-7XXX 7000–7999Assigned ONVOY, LLCV - MI 543C BIG RAPIDS MI
2013-03-20 231-599-7XXX 7000–7999Assigned ONVOY, LLCV - MI 543C EASTPORT MI
2013-03-20 231-745-5XXX 5000–5999Assigned ONVOY, LLCV - MI 543C BALDWIN MI
2013-03-20 231-790-6XXX 6000–6999Assigned ONVOY, LLCV - MI 543C FREESOIL MI
2013-03-06 231-327-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 MUSKEGON MI
2013-03-06 231-327-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 MUSKEGON MI
2013-03-04 231-866-4XXX 4000–4999Assigned CHARTER IP ENABLED SERVICES, LLC 792K SUTTONSBAY MI
2013-03-01 231-263-8XXX 8000–8999Assigned CHARTER IP ENABLED SERVICES, LLC 792K KINGSLEY 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.