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 360
LEVEL 3 COMMUNICATIONS, LLC - WA 61
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
2020-05-26 360-541 0–9 XXXall 10 · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 VANCOUVER WA
2015-09-22 360-768 0–9 XXXall 10 · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 VANCOUVER WA
2015-09-22 360-998 0–9 XXXall 10 · 8 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 LONGVIEW WA
2015-07-13 360-810 0–9 XXXall 10 · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 OLYMPIA WA
2009-08-26 360-831 0–9 XXXall 10 · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 VANCOUVER WA
2005-05-25 360-967 0–9 XXXall 10 · 7 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 CASTLEROCK WA
2002-10-17 360-203 0XXX1XXX4XXX5XXX6XXX7XXX which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 FORKS WA
2002-05-07 360-761 0–9 XXXall 10 · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 BUCKLEY WA
2001-06-25 360-209 0–9 XXXall 10 · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 ABERDEEN WA
2001-03-19 360-545 0XXX1XXX2XXX3XXX5XXX7XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SHELTON WA
2001-01-25 360-243 1XXX2XXX3XXX5XXX6XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SNOHOMISH WA
2001-01-25 360-390 1XXX2XXX3XXX4XXX5XXX7XXX8XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 PTTOWNSEND WA
2001-01-25 360-450 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 VANCOUVER WA
— 360-200 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 LONGVIEW WA
— 360-205 1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 BELFAIR WA
— 360-215 0XXX3XXX4XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 PORTLUDLOW WA
— 360-216 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 CAMAS WA
— 360-219 0XXX3XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 CHEHALIS WA
— 360-284 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 ENUMCLAW WA
— 360-306 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 WHATCOMCTY WA
— 360-350 0XXX2XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 OLYMPIA WA
— 360-362 0–9 XXXall 10 · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 BREMERTON WA
— 360-443 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 PORT ORCH WA
— 360-447 1XXX2XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SILVERDALE WA
— 360-464 0–9 XXXall 10 · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 OLYMPIA WA
— 360-467 0XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SNOHOMISH WA
— 360-483 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 WHATCOMCTY WA
— 360-488 0–9 XXXall 10 · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 MT VERNON WA
— 360-504 2XXX3XXX4XXX6XXX7XXX8XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 PT ANGELES WA
— 360-512 0XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SNOHOMISH WA
— 360-529 0–9 XXXall 10 · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 OLYMPIA WA
— 360-539 3XXX7XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 OLYMPIA WA
— 360-543 1XXX2XXX3XXX4XXX6XXX8XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 WHATCOMCTY WA
— 360-544 0XXX2XXX3XXX4XXX6XXX7XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 OAK HARBOR WA
— 360-548 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 MARYSVILLE WA
— 360-549 2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SHELTON WA
— 360-552 0XXX1XXX2XXX3XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 BELFAIR WA
— 360-554 2XXX8XXX9XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 PTTOWNSEND WA
— 360-557 2XXX3XXX4XXX5XXX7XXX8XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 CHEHALIS WA
— 360-587 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SKYKOMISH WA
— 360-603 0XXX1XXX2XXX3XXX6XXX8XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 WHATCOMCTY WA
— 360-612 1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 ABERDEEN WA
— 360-614 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 HOODSPORT WA
— 360-615 2XXX3XXX8XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 ENUMCLAW WA
— 360-616 1XXX3XXX6XXX8XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 BREMERTON WA
— 360-618 1XXX2XXX3XXX9XXX which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 MARYSVILLE WA
— 360-633 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SILVERDALE WA
— 360-637 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 ABERDEEN WA
— 360-639 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 OAK HARBOR WA
— 360-680 1XXX2XXX3XXX5XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 HOOD CANAL 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.