NumberResearch Membership · Data 09/19/2026

Recent prefix assignments

0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/19/2026

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
LEVEL 3 COMMUNICATIONS, LLC - WA 49
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
2022-12-30 425-461 2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 AMES LAKE WA
2019-10-29 425-300 0–9 XXXall 10 · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 BELLEVUE WA
2018-12-13 425-705 not yet reported which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 KIRKLAND WA
2018-12-13 425-722 not yet reported which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 KIRKLAND WA
2018-12-12 425-703 not yet reported which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 KIRKLAND WA
2018-12-12 425-706 not yet reported which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 KIRKLAND WA
2018-12-12 425-707 not yet reported which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 KIRKLAND WA
2018-08-22 425-410 0–9 XXXall 10 · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 BELLEVUE WA
2015-11-16 425-599 0–9 XXXall 10 · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 HALLS LAKE WA
2014-05-01 425-305 0–9 XXXall 10 · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 KIRKLAND WA
2006-01-04 425-502 0–9 XXXall 10 · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 BELLEVUE WA
2002-03-07 425-533 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 BELLEVUE WA
2002-02-21 425-336 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 RENTON WA
2002-02-21 425-358 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 MAPLE VLY WA
2002-02-21 425-654 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 ISSAQUAH WA
2001-10-31 425-367 0–9 XXXall 10 · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 EVERETT WA
2001-10-22 425-361 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 HALLS LAKE WA
2001-04-30 425-374 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 EVERETT WA
— 425-223 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 BELLEVUE WA
— 425-276 0XXX1XXX2XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 RENTON WA
— 425-296 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 KIRKLAND WA
— 425-307 0XXX1XXX2XXX4XXX5XXX7XXX8XXX9XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 KIRKLAND WA
— 425-318 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 BOTHELL WA
— 425-321 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SILVERLAKE WA
— 425-409 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 HALLS LAKE WA
— 425-421 0–9 XXXwhole prefix which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 KIRKLAND WA
— 425-437 2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 MAPLE VLY WA
— 425-458 8XXX which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 BELLEVUE WA
— 425-491 0XXX9XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 BOTHELL WA
— 425-605 not yet reported which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 KIRKLAND WA
— 425-608 1XXX9XXX which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 HALLS LAKE WA
— 425-609 not yet reported which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 EVERETT WA
— 425-651 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 ISSAQUAH WA
— 425-660 0XXX1XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 MAPLE VLY WA
— 425-663 0XXX1XXX9XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 RENTON WA
— 425-728 0–9 XXXall 10 · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 RENTON WA
— 425-738 2XXX3XXX7XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 RENTON WA
— 425-786 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 BELLEVUE WA
— 425-818 not yet reported which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 BELLEVUE WA
— 425-902 0XXX2XXX3XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 RENTON WA
— 425-903 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 EVERETT WA
— 425-939 2XXX which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 BOTHELL WA
— 425-947 2XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 KIRKLAND WA
— 425-948 0XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SILVERLAKE WA
— 425-949 1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 BOTHELL WA
— 425-953 0XXX3XXX6XXX7XXX8XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 EVERETT WA
— 425-954 0XXX2XXX3XXX5XXX6XXX7XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 HALLS LAKE WA
— 425-996 1XXX2XXX5XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 ISSAQUAH WA
— 425-999 0XXX1XXX2XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 BELLEVUE WA

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.