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
Clear Download CSV ↓
Recent thousands-block assignments
AssignedThousands-blockLast 4 digitsStatusAssigneeOCNRate centerState
2016-08-15 231-819-4XXX 4000–4999Assigned CLEAR RATE COMMUNICATIONS, LLC 046L TUSTIN MI
2016-08-15 231-885-7XXX 7000–7999Assigned CLEAR RATE COMMUNICATIONS, LLC 046L MESICK MI
2016-08-11 231-340-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 ELMIRA MI
2016-07-29 231-495-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 BELLAIRE MI
2016-07-27 231-489-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E PETOSKEY MI
2016-07-27 231-597-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E CHEBOYGAN MI
2016-07-27 231-655-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E MANISTEE MI
2016-07-26 231-212-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J INTERLOCHN MI
2016-07-26 231-538-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E FREMONT MI
2016-07-20 231-742-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 HART MI
2016-07-07 231-787-4XXX 4000–4999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E WHITECLOUD MI
2016-07-05 231-252-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J TRAVERSECY MI
2016-07-05 231-263-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 KINGSLEY MI
2016-07-05 231-434-6XXX 6000–6999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J MANTON MI
2016-07-05 231-879-1XXX 1000–1999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J FIFE LAKE MI
2016-06-27 231-757-7XXX 7000–7999Assigned CLEAR RATE COMMUNICATIONS, LLC 046L SCOTTVILLE MI
2016-06-13 231-508-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7157 ONEKAMA MI
2016-05-23 231-277-8XXX 8000–8999Assigned CHARTER IP ENABLED SERVICES, LLC 792K FOUNTAIN MI
2016-05-13 231-444-6XXX 6000–6999Assigned CHARTER IP ENABLED SERVICES, LLC 792K CADILLAC MI
2016-05-11 231-252-4XXX 4000–4999Assigned CHARTER IP ENABLED SERVICES, LLC 792K TRAVERSECY MI
2016-04-20 231-252-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E TRAVERSECY MI
2016-04-20 231-252-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E TRAVERSECY MI
2016-04-18 231-907-4XXX 4000–4999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E LUDINGTON MI
2016-04-14 231-444-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E CADILLAC MI
2016-04-05 231-277-2XXX 2000–2999Assigned ONVOY, LLCV - MI 543C FOUNTAIN MI
2016-04-05 231-277-3XXX 3000–3999Assigned ONVOY, LLCV - MI 543C FOUNTAIN MI
2016-03-29 231-538-6XXX 6000–6999Assigned ONVOY, LLCV - MI 543C FREMONT MI
2016-03-29 231-538-7XXX 7000–7999Assigned ONVOY, LLCV - MI 543C FREMONT MI
2016-03-29 231-613-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 SCOTTVILLE MI
2016-03-23 231-277-0XXX 0000–0999Assigned ONVOY, LLCV - MI 543C FOUNTAIN MI
2016-03-23 231-277-1XXX 1000–1999Assigned ONVOY, LLCV - MI 543C FOUNTAIN MI
2016-03-23 231-771-0XXX 0000–0999Assigned ONVOY, LLCV - MI 543C ELK RAPIDS MI
2016-03-23 231-771-1XXX 1000–1999Assigned ONVOY, LLCV - MI 543C ELK RAPIDS MI
2016-03-18 231-489-4XXX 4000–4999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 PETOSKEY MI
2016-03-18 231-489-5XXX 5000–5999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 PETOSKEY MI
2016-03-18 231-489-6XXX 6000–6999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 PETOSKEY MI
2016-03-18 231-886-4XXX 4000–4999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 KALKASKA MI
2016-03-18 231-886-5XXX 5000–5999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 KALKASKA MI
2016-03-17 231-412-8XXX 8000–8999Assigned ONVOY, LLCV - MI 543C HARBOR SPG MI
2016-03-17 231-412-9XXX 9000–9999Assigned ONVOY, LLCV - MI 543C HARBOR SPG MI
2016-03-17 231-422-3XXX 3000–3999Assigned ONVOY, LLCV - MI 543C PELLSTON MI
2016-03-17 231-422-4XXX 4000–4999Assigned ONVOY, LLCV - MI 543C PELLSTON MI
2016-03-17 231-434-3XXX 3000–3999Assigned ONVOY, LLCV - MI 543C MANTON MI
2016-03-17 231-434-4XXX 4000–4999Assigned ONVOY, LLCV - MI 543C MANTON MI
2016-03-17 231-484-3XXX 3000–3999Assigned ONVOY, LLCV - MI 543C EASTJORDAN MI
2016-03-17 231-484-4XXX 4000–4999Assigned ONVOY, LLCV - MI 543C EASTJORDAN MI
2016-03-17 231-508-7XXX 7000–7999Assigned ONVOY, LLCV - MI 543C ONEKAMA MI
2016-03-17 231-508-9XXX 9000–9999Assigned ONVOY, LLCV - MI 543C ONEKAMA MI
2016-03-17 231-844-0XXX 0000–0999Assigned ONVOY, LLCV - MI 543C INDIAN RIV MI
2016-03-17 231-844-5XXX 5000–5999Assigned ONVOY, LLCV - MI 543C INDIAN RIV 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.