NumberResearch Membership · Data 09/20/2026

Recent prefix assignments

0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/20/2026

Full prefixes (NXX) Thousands-blocks (1,000-number pools)

The Code holder is who opened each NPA-NXX prefix — not necessarily who holds the numbers. A prefix is 10,000 numbers, but under pooling its ten 1,000-number blocks are handed out individually, often to different carriers; the code holder may hold only one block, or none. The Thousands-blocks column shows how the ten blocks are really split — click which blocks → to see who holds each 1,000-number block and its last-4-digit range. Assignments are initial assignments; the current serving carrier may differ due to portability.

Most active assignees, all time — NPA 425
ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 122
T-MOBILE USA, INC. 91
QWEST CORPORATION 69
LEVEL 3 COMMUNICATIONS, LLC - WA 49
NEW CINGULAR WIRELESS PCS, LLC 44
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 NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
2026-04-20 425-665 0XXX1XXX · 2 holders which blocks → VOIP INNOVATIONS, LLC 597F BELLEVUE WA
2026-02-20 425-425 0XXX1XXX2XXX4XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → ACCELERATE NETWORKS LLC 147L EVERETT WA
2026-01-08 425-592 0XXX1XXX2XXX3XXX9XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 BELLEVUE WA
2025-12-19 425-579 0XXX1XXX2XXX3XXX7XXX8XXX9XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 HALLS LAKE WA
2025-12-19 425-581 0XXX9XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SILVERLAKE WA
2025-10-23 425-575 4XXX5XXX6XXX7XXX8XXX9XXX which blocks → T-MOBILE USA, INC. 6529 BELLEVUE WA
2025-10-14 425-995 0XXX1XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J EVERETT WA
2025-09-19 425-574 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 BELLEVUE WA
2025-08-29 425-573 0–9 XXXwhole prefix which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - WA 7146 EVERETT WA
2025-07-14 425-568 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 BELLEVUE WA
2025-04-30 425-567 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 HALLS LAKE WA
2025-01-24 425-566 0XXX1XXX4XXX6XXX9XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 RENTON WA
2024-12-16 425-571 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 ISSAQUAH WA
2024-10-11 425-325 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 BOTHELL WA
2024-08-30 425-570 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 HALLS LAKE WA
2024-03-15 425-565 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 EVERETT WA
2024-03-11 425-561 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 HALLS LAKE WA
2024-01-09 425-560 0–9 XXXall 10 · 4 holders which blocks → FIVE9, INC. 598J KIRKLAND WA
2023-12-11 425-479 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 RENTON WA
2023-10-06 425-550 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 HALLS LAKE WA
2023-04-14 425-476 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - WA 483E BOTHELL WA
2023-03-03 425-536 0–9 XXXall 10 · 4 holders which blocks → PEERLESS NETWORK OF WASHINGTON, LLC - WA 159F BELLEVUE WA
2023-02-13 425-473 0–9 XXXall 10 · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 RENTON WA
2023-01-27 425-472 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 BELLEVUE WA
2022-12-30 425-461 2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 AMES LAKE WA
2022-12-19 425-845 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - WA 483E KIRKLAND WA
2022-11-16 425-474 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - WA 483E EVERETT WA
2022-11-10 425-725 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - WA 483E HALLS LAKE WA
2022-10-19 425-384 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 BOTHELL WA
2022-10-17 425-554 0–9 XXXwhole prefix which blocks → ONVOY SPECTRUM, LLC 624H EVERETT WA
2022-09-13 425-464 2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → ONVOY, LLC - WA 483E FALL CITY WA
2022-09-01 425-552 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - WA 483E SILVERLAKE WA
2022-08-18 425-547 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 RENTON WA
2022-07-14 425-540 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 BOTHELL WA
2022-06-07 425-475 0–9 XXXall 10 · 4 holders which blocks → COMMIO, LLC 939H HALLS LAKE WA
2022-04-12 425-380 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 KIRKLAND WA
2022-03-08 425-548 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 BOTHELL WA
2022-03-01 425-543 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 BELLEVUE WA
2022-01-27 425-542 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 BELLEVUE WA
2022-01-21 425-541 0–9 XXXall 10 · 3 holders which blocks → PEERLESS NETWORK OF WASHINGTON, LLC - WA 159F EVERETT WA
2022-01-10 425-832 0–9 XXXall 10 · 5 holders which blocks → TON80 COMMUNICATIONS, LLC 516J ISSAQUAH WA
2022-01-05 425-683 0–9 XXXall 10 · 4 holders which blocks → TON80 COMMUNICATIONS, LLC 516J EVERETT WA
2021-12-14 425-545 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 RENTON WA
2021-11-02 425-506 0–9 XXXwhole prefix which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - WA 7146 KIRKLAND WA
2021-10-28 425-370 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 BELLEVUE WA
2021-10-04 425-340 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 ISSAQUAH WA
2021-09-22 425-469 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 BELLEVUE WA
2021-08-19 425-758 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H HALLS LAKE WA
2021-07-23 425-667 0–9 XXXall 10 · 5 holders which blocks → FRACTEL, LLC 965H BOTHELL WA
2021-07-23 425-842 0–9 XXXall 10 · 3 holders which blocks → FRACTEL, LLC 965H NORTH BEND WA

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/20/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.