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
2016-06-23 831-225-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 SALINAS CA
2016-06-23 831-789-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 SALINAS CA
2016-06-23 909-699-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 COLTON CA
2016-06-23 909-699-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 COLTON CA
2016-06-21 602-831-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2016-06-21 602-831-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2016-06-21 602-831-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2016-06-21 602-831-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2016-06-21 602-831-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2016-06-21 602-831-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2016-06-21 702-969-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 MESQUITE NV
2016-06-21 702-969-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 MESQUITE NV
2016-06-21 702-969-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 MESQUITE NV
2016-06-21 970-632-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 FT COLLINS CO
2016-06-21 970-632-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 FT COLLINS CO
2016-06-20 312-826-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2016-06-20 312-826-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2016-06-20 312-826-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2016-06-20 312-826-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2016-06-20 312-826-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2016-06-20 312-826-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2016-06-20 312-826-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2016-06-20 312-826-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2016-06-20 312-826-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2016-06-20 312-826-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2016-06-20 479-401-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 FORT SMITH AR
2016-06-20 479-401-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 FORT SMITH AR
2016-06-20 682-804-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 WEATHERFD TX
2016-06-20 775-300-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 RENO NV
2016-06-20 775-300-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 RENO NV
2016-06-17 425-240-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 BELLEVUE WA
2016-06-17 425-240-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 BELLEVUE WA
2016-06-17 510-707-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 OKLD TRNID CA
2016-06-17 510-707-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 OKLD TRNID CA
2016-06-17 510-707-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 OKLD TRNID CA
2016-06-17 510-707-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 OKLD TRNID CA
2016-06-17 510-707-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 OKLD TRNID CA
2016-06-17 657-335-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 SANTA ANA CA
2016-06-17 657-335-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 SANTA ANA CA
2016-06-17 657-335-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 SANTA ANA CA
2016-06-17 657-335-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 SANTA ANA CA
2016-06-17 657-335-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 SANTA ANA CA
2016-06-17 669-204-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 SNJS WEST CA
2016-06-17 669-204-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 SNJS WEST CA
2016-06-17 669-204-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 SNJS WEST CA
2016-06-17 669-204-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 SNJS WEST CA
2016-06-17 808-773-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 HONOLULU HI
2016-06-17 909-490-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 ONTARIO CA
2016-06-17 909-490-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 ONTARIO CA
2016-06-15 209-302-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 MANTECA CA

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.