NumberResearch Membership · Data 09/26/2026

Recent thousands-block assignments

68 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/26/2026

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
T-MOBILE USA, INC. 68
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
2016-12-07 224-421-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 ARLIGTNHTS IL
2016-12-07 224-421-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 ARLIGTNHTS IL
2016-12-07 224-421-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 ARLIGTNHTS IL
2016-12-07 224-421-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 ARLIGTNHTS IL
2016-12-07 224-421-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 ARLIGTNHTS IL
2016-12-07 224-421-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 ARLIGTNHTS IL
2016-12-07 224-421-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 ARLIGTNHTS IL
2016-12-07 224-421-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 ARLIGTNHTS IL
2016-12-07 224-540-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 ROUND LAKE IL
2016-12-07 224-540-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 ROUND LAKE IL
2016-12-07 224-540-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 ROUND LAKE IL
2016-12-07 224-551-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 DEERFIELD IL
2016-12-07 224-551-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 DEERFIELD IL
2016-12-07 224-551-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 DEERFIELD IL
2016-12-07 224-551-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 DEERFIELD IL
2016-12-07 224-575-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 ELGIN IL
2016-12-07 224-575-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 ELGIN IL
2016-12-07 331-385-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 AURORA IL
2016-12-07 331-385-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 AURORA IL
2016-12-07 331-385-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 AURORA IL
2016-12-07 331-385-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 AURORA IL
2016-12-07 331-385-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 AURORA IL
2016-12-07 331-707-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 AURORA IL
2016-12-07 469-514-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 FRISCO TX
2016-12-07 469-514-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 FRISCO TX
2016-12-07 469-514-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 FRISCO TX
2016-12-07 469-514-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 FRISCO TX
2016-12-07 619-558-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 EL CAJON CA
2016-12-07 630-819-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 HINSDALE IL
2016-12-07 630-819-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 HINSDALE IL
2016-12-07 708-852-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 CHICAGOHTS IL
2016-12-07 720-462-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 DENVER CO
2016-12-07 720-462-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 DENVER CO
2016-12-07 720-462-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 DENVER CO
2016-12-07 720-462-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 DENVER CO
2016-12-07 858-883-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 POWAY CA
2016-12-07 925-214-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 WALNUT CRK CA
2016-12-06 559-290-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 FRESNO CA
2016-12-06 619-830-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 CHULAVISTA CA
2016-12-06 619-830-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 CHULAVISTA CA
2016-12-06 628-213-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 SNFC CNTRL CA
2016-12-06 661-553-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 DELANO CA
2016-12-06 951-441-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 ARLINGTON CA
2016-12-05 314-396-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 ST LOUIS MO
2016-12-05 314-930-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 ST LOUIS MO
2016-12-05 385-254-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 PROVO UT
2016-12-05 385-482-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 PROVO UT
2016-12-05 385-482-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 PROVO UT
2016-12-05 608-312-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 BELOIT WI
2016-12-05 608-800-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 MADISON WI

Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/26/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.