NumberResearch Membership · Data 09/19/2026

Recent thousands-block assignments

0 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/19/2026

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, all time — NPA 231
CENTURYLINK COMMUNICATIONS, LLC 75
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
2020-04-15 231-666-2XXX 2000–2999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J MUSKEGON MI
2020-04-15 231-666-3XXX 3000–3999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J MUSKEGON MI
2020-04-15 231-666-5XXX 5000–5999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J MUSKEGON MI
2020-04-15 231-666-8XXX 8000–8999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J MUSKEGON MI
2020-04-15 231-666-9XXX 9000–9999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J MUSKEGON MI
2017-10-02 231-787-6XXX 6000–6999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J WHITECLOUD MI
2017-09-01 231-241-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J PENTWATER MI
2017-09-01 231-259-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J SHELBY MI
2017-09-01 231-403-8XXX 8000–8999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J WILLIAMSBG MI
2017-09-01 231-819-6XXX 6000–6999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J TUSTIN MI
2017-09-01 231-925-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J SCOTTVILLE MI
2017-08-30 231-277-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J FOUNTAIN MI
2017-08-30 231-442-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J HARRIETTA MI
2017-08-30 231-450-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J HESPERIA MI
2017-08-30 231-464-3XXX 3000–3999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J FREESOIL MI
2017-08-30 231-480-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J LUDINGTON MI
2017-08-30 231-508-4XXX 4000–4999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J ONEKAMA MI
2017-08-30 231-651-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J BEULAH MI
2017-08-30 231-655-6XXX 6000–6999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J MANISTEE MI
2017-08-30 231-721-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J HART MI
2017-08-30 231-729-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J IRONS MI
2017-08-30 231-797-8XXX 8000–8999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J LUTHER MI
2017-08-30 231-886-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J KALKASKA 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
2016-07-26 231-212-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J INTERLOCHN MI
2016-07-05 231-252-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J TRAVERSECY 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
2015-09-22 231-549-8XXX 8000–8999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J BOYNEFALLS MI
2015-09-17 231-529-4XXX 4000–4999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J BRUTUS MI
2015-08-28 231-999-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J CENTRAL LK MI
2015-08-26 231-244-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J BOYNE CITY MI
2015-08-25 231-422-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J PELLSTON MI
2015-08-18 231-203-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J ALANSON MI
2015-08-18 231-292-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J WHITEHALL MI
2015-08-18 231-322-5XXX 5000–5999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J TRCHRIVBDG MI
2015-08-18 231-751-6XXX 6000–6999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J WALLOON LK MI
2015-08-18 231-833-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J WOLVERINE MI
2015-08-18 231-888-6XXX 6000–6999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J TWIN LAKE MI
2015-08-17 231-303-8XXX 8000–8999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J NEWAYGO MI
2015-08-17 231-386-8XXX 8000–8999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J NORTHPORT MI
2015-08-17 231-559-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J MCBAIN MI
2015-08-17 231-685-8XXX 8000–8999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J RAVENNA MI
2015-08-17 231-743-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J MARION MI
2015-08-17 231-753-0XXX 0000–0999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J PETOSKEY MI
2015-08-17 231-803-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J MORLEY MI
2015-08-13 231-201-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J CHIPPEWALK MI
2015-08-13 231-264-3XXX 3000–3999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J ELK RAPIDS MI

Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.