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 815
T-MOBILE USA, INC. 323
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
2025-01-13 815-930-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 ELIZABETH IL
2024-08-27 815-779-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 PLAINFIELD IL
2024-08-27 815-779-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 PLAINFIELD IL
2024-08-27 815-779-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 PLAINFIELD IL
2024-02-08 815-779-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 PLAINFIELD IL
2024-02-08 815-779-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 PLAINFIELD IL
2024-02-08 815-779-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 PLAINFIELD IL
2024-01-10 815-660-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 LOCKPORT IL
2024-01-09 815-560-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 HARVARD IL
2023-06-27 815-859-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 ROCHELLE IL
2023-06-27 815-859-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 ROCHELLE IL
2022-12-16 815-763-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 JOLIET IL
2022-12-16 815-763-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 JOLIET IL
2022-09-28 815-749-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 LOCKPORT IL
2022-09-28 815-749-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 LOCKPORT IL
2022-09-20 815-749-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 LOCKPORT IL
2022-09-20 815-749-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 LOCKPORT IL
2022-09-20 815-749-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 LOCKPORT IL
2022-09-20 815-749-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 LOCKPORT IL
2021-02-18 815-615-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 MENDOTA IL
2021-01-30 815-909-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 DE KALB IL
2021-01-30 815-909-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 DE KALB IL
2019-08-14 815-909-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 DE KALB IL
2018-04-30 815-503-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 MENDOTA IL
2018-02-23 815-564-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 STERLING IL
2017-05-31 815-656-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 FREEPORT IL
2017-05-31 815-656-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 FREEPORT IL
2017-05-31 815-656-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 FREEPORT IL
2017-05-31 815-656-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 FREEPORT IL
2017-05-31 815-656-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 FREEPORT IL
2017-05-31 815-661-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 MORRIS IL
2017-05-31 815-661-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 MORRIS IL
2017-03-29 815-766-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 DE KALB IL
2017-03-29 815-766-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 DE KALB IL
2017-03-29 815-766-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 DE KALB IL
2016-12-12 815-416-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 MORRIS IL
2016-12-12 815-416-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 MORRIS IL
2016-11-11 815-687-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 WOODSTOCK IL
2016-11-11 815-687-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 WOODSTOCK IL
2016-06-14 815-710-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 MORRIS IL
2016-06-14 815-710-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 MORRIS IL
2016-02-23 815-217-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 DE KALB IL
2015-05-19 815-329-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 ROCKFORD IL
2015-05-19 815-329-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 ROCKFORD IL
2015-05-19 815-329-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 ROCKFORD IL
2015-05-19 815-329-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 ROCKFORD IL
2015-05-19 815-329-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 ROCKFORD IL
2014-12-03 815-764-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 DE KALB IL
2014-12-03 815-764-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 DE KALB IL
2014-12-03 815-764-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 DE KALB IL

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.