NumberResearch Membership · Data 09/21/2026

Recent thousands-block assignments

0 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/21/2026

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 574
T-MOBILE USA, INC. 20
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
2023-04-07 574-221-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 NAPPANEE IN
2023-04-07 574-356-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 NAPPANEE IN
2022-07-21 574-581-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 MONTICELLO IN
2022-07-21 574-581-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 MONTICELLO IN
2022-07-21 574-581-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 MONTICELLO IN
2021-12-06 574-373-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 WARSAW IN
2021-12-06 574-373-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 WARSAW IN
2021-02-05 574-240-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 MONTICELLO IN
2021-02-05 574-373-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 WARSAW IN
2013-10-31 574-301-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 BREMEN IN
2006-10-04 574-209-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 BREMEN IN
2006-10-04 574-356-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 NAPPANEE IN
2006-09-28 574-549-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 WARSAW IN
2006-03-31 574-808-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 MONTICELLO IN
2006-03-28 574-265-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 WARSAW IN
2004-12-28 574-265-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 WARSAW IN
2004-11-05 574-808-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 MONTICELLO IN
2003-12-01 574-356-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 NAPPANEE IN
2003-11-11 574-297-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 MONTICELLO IN
2003-03-25 574-301-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 BREMEN IN

Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/21/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.