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
2020-11-04 231-281-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CADILLAC MI
2020-11-04 231-281-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CADILLAC MI
2020-10-29 231-262-8XXX 8000–8999Assigned ONVOY, LLCV - MI 543C ELMIRA MI
2020-10-29 231-262-9XXX 9000–9999Assigned ONVOY, LLCV - MI 543C ELMIRA MI
2020-10-29 231-273-3XXX 3000–3999Assigned ONVOY, LLCV - MI 543C EASTPORT MI
2020-10-29 231-273-4XXX 4000–4999Assigned ONVOY, LLCV - MI 543C EASTPORT MI
2020-10-29 231-278-7XXX 7000–7999Assigned ONVOY, LLCV - MI 543C HESPERIA MI
2020-10-29 231-278-8XXX 8000–8999Assigned ONVOY, LLCV - MI 543C HESPERIA MI
2020-10-29 231-304-4XXX 4000–4999Assigned ONVOY, LLCV - MI 543C BRUTUS MI
2020-10-29 231-304-5XXX 5000–5999Assigned ONVOY, LLCV - MI 543C BRUTUS MI
2020-10-29 231-448-6XXX 6000–6999Assigned ONVOY, LLCV - MI 543C ST JAMES MI
2020-10-29 231-448-7XXX 7000–7999Assigned ONVOY, LLCV - MI 543C ST JAMES MI
2020-10-29 231-626-4XXX 4000–4999Assigned ONVOY, LLCV - MI 543C LEVERING MI
2020-10-29 231-626-5XXX 5000–5999Assigned ONVOY, LLCV - MI 543C LEVERING MI
2020-10-29 231-681-4XXX 4000–4999Assigned ONVOY, LLCV - MI 543C FRUITPORT MI
2020-10-29 231-681-5XXX 5000–5999Assigned ONVOY, LLCV - MI 543C FRUITPORT MI
2020-10-22 231-640-7XXX 7000–7999Assigned ONVOY, LLCV - MI 543C LAKE ANN MI
2020-10-22 231-640-8XXX 8000–8999Assigned ONVOY, LLCV - MI 543C LAKE ANN MI
2020-10-22 231-685-3XXX 3000–3999Assigned ONVOY, LLCV - MI 543C RAVENNA MI
2020-10-22 231-685-4XXX 4000–4999Assigned ONVOY, LLCV - MI 543C RAVENNA MI
2020-10-22 231-743-0XXX 0000–0999Assigned ONVOY, LLCV - MI 543C MARION MI
2020-10-22 231-743-1XXX 1000–1999Assigned ONVOY, LLCV - MI 543C MARION MI
2020-10-21 231-279-8XXX 8000–8999Assigned ONVOY, LLCV - MI 543C BIG RAPIDS MI
2020-10-21 231-279-9XXX 9000–9999Assigned ONVOY, LLCV - MI 543C BIG RAPIDS MI
2020-10-21 231-462-2XXX 2000–2999Assigned ONVOY, LLCV - MI 543C FOUNTAIN MI
2020-10-21 231-462-6XXX 6000–6999Assigned ONVOY, LLCV - MI 543C FOUNTAIN MI
2020-10-21 231-721-2XXX 2000–2999Assigned ONVOY, LLCV - MI 543C HART MI
2020-10-21 231-721-3XXX 3000–3999Assigned ONVOY, LLCV - MI 543C HART MI
2020-10-19 231-531-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J MUSKEGON MI
2020-10-19 231-900-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J MUSKEGON MI
2020-10-15 231-437-8XXX 8000–8999Assigned ONVOY, LLCV - MI 543C CHARLEVOIX MI
2020-10-15 231-437-9XXX 9000–9999Assigned ONVOY, LLCV - MI 543C CHARLEVOIX MI
2020-10-15 231-707-2XXX 2000–2999Assigned ONVOY, LLCV - MI 543C NEWAYGO MI
2020-10-15 231-707-3XXX 3000–3999Assigned ONVOY, LLCV - MI 543C NEWAYGO MI
2020-10-14 231-262-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 ELMIRA MI
2020-10-14 231-340-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 ELMIRA MI
2020-09-29 231-216-5XXX 5000–5999Assigned PEERLESS NETWORK OF MICHIGAN, LLC - MI 933G FRANKFORT MI
2020-09-18 231-277-5XXX 5000–5999Assigned ONVOY, LLCV - MI 543C FOUNTAIN MI
2020-09-18 231-277-6XXX 6000–6999Assigned ONVOY, LLCV - MI 543C FOUNTAIN MI
2020-09-18 231-450-8XXX 8000–8999Assigned ONVOY, LLCV - MI 543C HESPERIA MI
2020-09-18 231-450-9XXX 9000–9999Assigned ONVOY, LLCV - MI 543C HESPERIA MI
2020-09-16 231-577-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CADILLAC MI
2020-08-25 231-879-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E FIFE LAKE MI
2020-08-13 231-201-6XXX 6000–6999Assigned ONVOY, LLCV - MI 543C CHIPPEWALK MI
2020-08-13 231-201-9XXX 9000–9999Assigned ONVOY, LLCV - MI 543C CHIPPEWALK MI
2020-08-13 231-227-8XXX 8000–8999Assigned ONVOY, LLCV - MI 543C HONOR MI
2020-08-13 231-227-9XXX 9000–9999Assigned ONVOY, LLCV - MI 543C HONOR MI
2020-08-13 231-241-8XXX 8000–8999Assigned ONVOY, LLCV - MI 543C PENTWATER MI
2020-08-13 231-241-9XXX 9000–9999Assigned ONVOY, LLCV - MI 543C PENTWATER MI
2020-08-13 231-261-7XXX 7000–7999Assigned ONVOY, LLCV - MI 543C LUDINGTON 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.