NumberResearch Membership · Data 09/20/2026

Recent thousands-block assignments

0 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, all time — NPA 406
CENTURYLINK COMMUNICATIONS, LLC 62
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
2023-01-30 406-215-0XXX 0000–0999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J MISSOULA MT
2022-06-16 406-613-1XXX 1000–1999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J BOZEMAN MT
2022-06-16 406-613-2XXX 2000–2999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J BOZEMAN MT
2022-06-16 406-613-3XXX 3000–3999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J BOZEMAN MT
2022-06-16 406-613-4XXX 4000–4999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J BOZEMAN MT
2022-06-16 406-613-5XXX 5000–5999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J BOZEMAN MT
2019-09-16 406-389-2XXX 2000–2999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J HELENA MT
2017-11-06 406-601-5XXX 5000–5999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J BILLINGS MT
2017-11-06 406-601-6XXX 6000–6999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J BILLINGS MT
2017-11-06 406-601-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J BILLINGS MT
2017-05-16 406-218-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J MISSOULA MT
2016-09-12 406-729-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J WILSALL MT
2016-07-08 406-426-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J RED LODGE MT
2016-07-08 406-795-4XXX 4000–4999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J WIBAUX MT
2016-07-08 406-851-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J MILES CITY MT
2016-07-08 406-943-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J SIDNEY MT
2016-07-07 406-282-5XXX 5000–5999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J MANHATTAN MT
2016-07-07 406-577-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J BOZEMAN MT
2016-07-07 406-668-8XXX 8000–8999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J FROMBERG MT
2016-07-07 406-740-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J COLSTRIP MT
2016-07-07 406-742-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J FAIRVIEW MT
2016-07-07 406-743-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J LAUREL MT
2016-07-07 406-780-6XXX 6000–6999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J COLUMBUS MT
2016-07-07 406-800-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J BRIDGER MT
2016-07-07 406-813-4XXX 4000–4999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J BELGRADE MT
2016-07-07 406-838-4XXX 4000–4999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J COOKE CITY MT
2016-07-07 406-946-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J LIVINGSTON MT
2016-07-07 406-987-6XXX 6000–6999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J GLENDIVE MT
2016-06-07 406-970-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J BILLINGS MT
2016-01-11 406-604-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J GREATFALLS MT
2015-05-28 406-299-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J BUTTE MT
2015-02-17 406-659-6XXX 6000–6999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J NO PARKMAN MT
2015-02-12 406-574-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J SILVERTIP MT
2014-05-06 406-925-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J DILLON MT
2014-05-05 406-302-6XXX 6000–6999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J WOLF CREEK MT
2014-05-05 406-863-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J WHITEFISH MT
2014-05-05 406-982-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J YELLOW BAY MT
2014-04-30 406-226-6XXX 6000–6999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J EGLACIERPK MT
2014-04-30 406-229-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J CUT BANK MT
2014-04-30 406-300-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J KALISPELL MT
2014-04-30 406-313-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J BOULDER MT
2014-04-30 406-387-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J HUNGRYHORS MT
2014-04-30 406-415-6XXX 6000–6999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J DEER LODGE MT
2014-04-30 406-505-6XXX 6000–6999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J CONRAD MT
2014-04-30 406-508-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J FRENCHTOWN MT
2014-04-30 406-521-6XXX 6000–6999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J TOWNSEND MT
2014-04-30 406-625-6XXX 6000–6999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J STEVENSVL MT
2014-04-30 406-642-5XXX 5000–5999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J VICTOR MT
2014-04-30 406-708-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J LEWISTOWN MT
2014-04-30 406-802-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J HAMILTON MT

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.