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
2019-08-05 425-282-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J RENTON WA
2019-08-05 425-535-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 EVERETT WA
2019-07-29 425-585-7XXX 7000–7999Assigned HD CARRIER LLC 321J SILVERLAKE WA
2019-07-09 425-399-8XXX 8000–8999Assigned ONVOY, LLC - WA 483E SILVERLAKE WA
2019-07-03 425-395-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 ISSAQUAH WA
2019-07-03 425-414-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 ISSAQUAH WA
2019-07-03 425-414-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 ISSAQUAH WA
2019-07-03 425-414-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 ISSAQUAH WA
2019-07-03 425-507-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 ISSAQUAH WA
2019-06-19 425-403-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 KIRKLAND WA
2019-06-14 425-426-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 EVERETT WA
2019-06-05 425-414-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 ISSAQUAH WA
2019-06-05 425-428-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 ISSAQUAH WA
2019-06-05 425-428-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 ISSAQUAH WA
2019-06-05 425-436-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J BELLEVUE WA
2019-06-05 425-480-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J HALLS LAKE WA
2019-06-05 425-491-9XXX 9000–9999Assigned COMCAST IP PHONE, LLC 318J BOTHELL WA
2019-06-05 425-535-4XXX 4000–4999Assigned COMCAST IP PHONE, LLC 318J EVERETT WA
2019-05-28 425-549-1XXX 1000–1999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - WA 7146 CARNATION WA
2019-05-24 425-572-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 RENTON WA
2019-05-08 425-428-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 ISSAQUAH WA
2019-05-08 425-428-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 ISSAQUAH WA
2019-05-07 425-480-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 HALLS LAKE WA
2019-05-06 425-436-2XXX 2000–2999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 BELLEVUE WA
2019-05-06 425-436-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 BELLEVUE WA
2019-05-01 425-436-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 BELLEVUE WA
2019-04-26 425-491-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 BOTHELL WA
2019-04-25 425-436-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 BELLEVUE WA
2019-04-25 425-436-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 BELLEVUE WA
2019-04-23 425-505-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 BELLEVUE WA
2019-04-23 425-515-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 BELLEVUE WA
2019-04-15 425-480-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 HALLS LAKE WA
2019-04-15 425-535-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 EVERETT WA
2019-04-11 425-585-6XXX 6000–6999Assigned HD CARRIER LLC 321J SILVERLAKE WA
2019-04-08 425-217-0XXX 0000–0999Assigned ONVOY, LLC - WA 483E BOTHELL WA
2019-04-08 425-217-5XXX 5000–5999Assigned ONVOY, LLC - WA 483E BOTHELL WA
2019-04-08 425-428-4XXX 4000–4999Assigned ONVOY, LLC - WA 483E ISSAQUAH WA
2019-04-08 425-428-5XXX 5000–5999Assigned ONVOY, LLC - WA 483E ISSAQUAH WA
2019-04-08 425-428-6XXX 6000–6999Assigned ONVOY, LLC - WA 483E ISSAQUAH WA
2019-03-28 425-515-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 BELLEVUE WA
2019-03-28 425-515-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 BELLEVUE WA
2019-03-28 425-515-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 BELLEVUE WA
2019-03-19 425-428-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 ISSAQUAH WA
2019-03-19 425-528-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 RENTON WA
2019-03-13 425-243-0XXX 0000–0999Assigned ONVOY, LLC - WA 483E RENTON WA
2019-02-26 425-217-4XXX 4000–4999Assigned ASTOUND BROADBAND, LLC - WA 937F BOTHELL WA
2019-01-31 425-515-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 BELLEVUE WA
2019-01-31 425-515-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 BELLEVUE WA
2019-01-31 425-515-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 BELLEVUE WA
2019-01-29 425-217-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 BOTHELL 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.