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
2011-08-11 231-399-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C FRANKFORT MI
2011-08-11 231-412-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C HARBOR SPG MI
2011-08-11 231-437-2XXX 2000–2999Assigned AT&T ENTERPRISES, LLC 516C CHARLEVOIX MI
2011-08-11 231-462-7XXX 7000–7999Assigned AT&T ENTERPRISES, LLC 516C FOUNTAIN MI
2011-08-11 231-498-6XXX 6000–6999Assigned AT&T ENTERPRISES, LLC 516C ELK RAPIDS MI
2011-08-11 231-508-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C ONEKAMA MI
2011-08-11 231-518-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C KALKASKA MI
2011-08-11 231-535-7XXX 7000–7999Assigned AT&T ENTERPRISES, LLC 516C WALLOON LK MI
2011-08-11 231-536-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C EASTJORDAN MI
2011-08-11 231-539-9XXX 9000–9999Assigned AT&T ENTERPRISES, LLC 516C PELLSTON MI
2011-08-11 231-570-7XXX 7000–7999Assigned AT&T ENTERPRISES, LLC 516C FIFE LAKE MI
2011-08-11 231-651-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C BEULAH MI
2011-08-11 231-660-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C BIG RAPIDS MI
2011-08-11 231-714-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C TRAVERSECY MI
2011-08-11 231-743-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C MARION MI
2011-08-11 231-774-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C INTERLOCHN MI
2011-08-11 231-790-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C FREESOIL MI
2011-08-11 231-793-6XXX 6000–6999Assigned AT&T ENTERPRISES, LLC 516C WHITECLOUD MI
2011-08-11 231-803-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C MORLEY MI
2011-08-11 231-825-6XXX 6000–6999Assigned AT&T ENTERPRISES, LLC 516C MCBAIN MI
2011-08-11 231-829-2XXX 2000–2999Assigned AT&T ENTERPRISES, LLC 516C TUSTIN MI
2011-08-11 231-936-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C SCOTTVILLE MI
2011-08-11 231-942-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C CADILLAC MI
2011-08-11 231-994-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C LKLEELANAU MI
2011-08-03 231-715-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 TRAVERSECY MI
2011-08-03 231-852-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LUDINGTON MI
2011-07-22 231-268-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E CHEBOYGAN MI
2011-07-18 231-527-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E BIG RAPIDS MI
2011-07-18 231-942-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E CADILLAC MI
2011-07-12 231-729-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 IRONS MI
2011-06-30 231-651-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 BEULAH MI
2011-06-21 231-835-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 GLEN LAKE MI
2011-06-20 231-714-8XXX 8000–8999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 TRAVERSECY MI
2011-06-16 231-846-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CADILLAC MI
2011-06-08 231-834-2XXX 2000–2999Assigned CLEAR RATE COMMUNICATIONS, LLC 046L GRANT MI
2011-05-31 231-794-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E MANISTEE MI
2011-05-31 231-994-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E LKLEELANAU MI
2011-05-27 231-622-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E PETOSKEY MI
2011-05-18 231-445-7XXX 7000–7999Assigned AT&T ENTERPRISES, LLC 516C CHEBOYGAN MI
2011-05-17 231-268-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E CHEBOYGAN MI
2011-05-17 231-287-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E BIG RAPIDS MI
2011-05-17 231-303-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E NEWAYGO MI
2011-05-17 231-335-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E FREMONT MI
2011-05-17 231-577-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E CADILLAC MI
2011-05-05 231-433-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 MOORESTOWN MI
2011-04-27 231-450-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 HESPERIA MI
2011-04-22 231-527-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 BIG RAPIDS MI
2011-04-18 231-245-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 NEWAYGO MI
2011-04-18 231-287-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 BIG RAPIDS MI
2011-04-18 231-383-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 BEULAH 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.