NumberResearch Membership · Data 09/20/2026

Recent thousands-block assignments

2 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, last 30 days — NPA 425
NEW CINGULAR WIRELESS PCS, LLC 2
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
2020-02-20 425-300-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 BELLEVUE WA
2020-02-20 425-300-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 BELLEVUE WA
2020-02-20 425-300-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 BELLEVUE WA
2020-02-20 425-515-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 BELLEVUE WA
2020-02-10 425-480-7XXX 7000–7999Assigned PAETEC ITEL, LLC 829J HALLS LAKE WA
2020-02-07 425-521-5XXX 5000–5999Assigned ONVOY, LLC - WA 483E EVERETT WA
2020-02-07 425-521-6XXX 6000–6999Assigned ONVOY, LLC - WA 483E EVERETT WA
2020-02-05 425-300-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 BELLEVUE WA
2020-02-05 425-403-7XXX 7000–7999Assigned PEERLESS NETWORK OF WASHINGTON, LLC - WA 159F KIRKLAND WA
2020-01-25 425-459-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 BELLEVUE WA
2020-01-25 425-459-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 BELLEVUE WA
2020-01-25 425-459-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 BELLEVUE WA
2020-01-16 425-459-5XXX 5000–5999Assigned ONVOY, LLC - WA 483E BELLEVUE WA
2020-01-16 425-459-6XXX 6000–6999Assigned ONVOY, LLC - WA 483E BELLEVUE WA
2020-01-14 425-300-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 BELLEVUE WA
2020-01-14 425-300-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 BELLEVUE WA
2020-01-09 425-465-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 ISSAQUAH WA
2020-01-09 425-465-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 ISSAQUAH WA
2020-01-09 425-465-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 ISSAQUAH WA
2019-12-19 425-403-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 KIRKLAND WA
2019-12-18 425-572-8XXX 8000–8999Assigned METROPCS, INC. 5562 RENTON WA
2019-12-18 425-585-3XXX 3000–3999Assigned METROPCS, INC. 5562 SILVERLAKE WA
2019-12-13 425-396-9XXX 9000–9999Assigned ONVOY, LLC - WA 483E NORTH BEND WA
2019-12-13 425-728-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 RENTON WA
2019-12-09 425-300-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - WA 006F BELLEVUE WA
2019-12-03 425-300-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - WA 006F BELLEVUE WA
2019-12-03 425-403-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 KIRKLAND WA
2019-11-11 425-521-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - WA 006F EVERETT WA
2019-11-08 425-403-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - WA 7274 KIRKLAND WA
2019-11-07 425-300-9XXX 9000–9999Assigned PEERLESS NETWORK OF WASHINGTON, LLC - WA 159F BELLEVUE WA
2019-11-04 425-490-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 FALL CITY WA
2019-10-29 425-300-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 BELLEVUE WA
2019-10-25 425-439-3XXX 3000–3999Assigned LEVEL 3 TELECOM OF WASHINGTON, LLC - WA 7455 BOTHELL WA
2019-10-24 425-689-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 AMES LAKE WA
2019-10-23 425-970-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 RENTON WA
2019-10-16 425-410-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 BELLEVUE WA
2019-10-16 425-436-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 BELLEVUE WA
2019-10-16 425-436-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 BELLEVUE WA
2019-10-16 425-436-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 BELLEVUE WA
2019-10-01 425-433-9XXX 9000–9999Assigned TELNYX LLC 073H MAPLE VLY WA
2019-09-30 425-521-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 EVERETT WA
2019-09-30 425-521-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 EVERETT WA
2019-09-27 425-689-9XXX 9000–9999Assigned ASTOUND BROADBAND, LLC - WA 937F AMES LAKE WA
2019-09-26 425-414-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 ISSAQUAH WA
2019-09-26 425-535-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 EVERETT WA
2019-09-25 425-439-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 BOTHELL WA
2019-09-16 425-393-6XXX 6000–6999Assigned IP HORIZON LLC 515J BELLEVUE WA
2019-09-03 425-439-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 BOTHELL WA
2019-08-22 425-535-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 EVERETT WA
2019-08-13 425-436-6XXX 6000–6999Assigned HD CARRIER LLC 321J BELLEVUE WA

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.