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 336
LEVEL 3 COMMUNICATIONS, LLC - NC 24
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
2018-11-21 336-640 0XXX1XXX2XXX3XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - NC 3235 SPARTA NC
2017-05-09 336-966 0–9 XXXwhole prefix which blocks → LEVEL 3 COMMUNICATIONS, LLC - NC 3235 WINSTN SAL NC
2014-04-02 336-606 0–9 XXXall 10 · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - NC 3235 SANDYRIDGE NC
2014-04-02 336-915 0–9 XXXall 10 · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - NC 3235 ROXBORO NC
2014-04-02 336-916 0–9 XXXall 10 · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - NC 3235 MADISON NC
2011-09-13 336-904 0–9 XXXall 10 · 7 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - NC 3235 KERNERSVL NC
2010-10-29 336-600 0–9 XXXall 10 · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - NC 3235 OLDTOWN NC
2007-08-09 336-612 0–9 XXXall 10 · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - NC 3235 EDEN NC
2005-03-08 336-525 0–9 XXXall 10 · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - NC 3235 SAXAPAHAW NC
2005-03-08 336-844 0–9 XXXall 10 · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - NC 3235 NOWILKESBO NC
2004-10-18 336-505 0–9 XXXall 10 · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - NC 3235 KIMESVILLE NC
2004-07-16 336-443 0–9 XXXall 10 · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - NC 3235 DOBSON NC
2004-04-26 336-459 0–9 XXXall 10 · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - NC 3235 YANCEYVL NC
2003-10-01 336-441 0–9 XXXall 10 · 7 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - NC 3235 SUMMERFLD NC
2002-02-11 336-329 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - NC 3235 BURLINGTON NC
2001-07-24 336-790 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX which blocks → LEVEL 3 COMMUNICATIONS, LLC - NC 3235 GREENSBORO NC
2001-07-24 336-791 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - NC 3235 REIDSVILLE NC
2001-07-24 336-793 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - NC 3235 WINSTN SAL NC
— 336-283 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - NC 3235 WINSTN SAL NC
— 336-285 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - NC 3235 GREENSBORO NC
— 336-331 2XXX3XXX5XXX7XXX8XXX9XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - NC 3235 WINSTN SAL NC
— 336-499 not yet reported which blocks → LEVEL 3 COMMUNICATIONS, LLC - NC 3235 WINSTN SAL NC
— 336-510 not yet reported which blocks → LEVEL 3 COMMUNICATIONS, LLC - NC 3235 GREENSBORO NC
— 336-517 4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - NC 3235 GREENSBORO NC

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.