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 920
LEVEL 3 COMMUNICATIONS, LLC - WI 46
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
Clear Download CSV ↓
Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
2022-12-06 920-760 0–9 XXXall 10 · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WI 5489 APPLETON WI
2012-11-16 920-234 0–9 XXXall 10 · 7 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WI 5489 SHEBOGNFLS WI
2005-05-03 920-550 0–9 XXXall 10 · 7 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WI 5489 SHEBOGNFLS WI
2004-06-29 920-240 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WI 5489 WAUTOMA WI
2004-06-29 920-260 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WI 5489 MARKESAN WI
2004-04-16 920-354 0–9 XXXall 10 · 7 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WI 5489 BERLIN WI
2003-03-03 920-624 1XXX2XXX3XXX5XXX6XXX7XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WI 5489 ST CLOUD WI
2003-02-28 920-587 7XXX8XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WI 5489 OOSTBURG WI
2003-02-05 920-486 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WI 5489 NEENAH WI
2002-10-31 920-552 1XXX2XXX5XXX6XXX7XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WI 5489 OOSTBURG WI
2002-08-21 920-443 1XXX2XXX3XXX5XXX6XXX7XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WI 5489 REEDSVILLE WI
2002-08-21 920-447 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WI 5489 RANDOMLAKE WI
2002-08-21 920-449 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WI 5489 PLYMOUTH WI
2002-08-21 920-522 0XXX2XXX3XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WI 5489 CHILTON WI
2002-08-21 920-523 1XXX2XXX3XXX6XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WI 5489 CASCADE WI
2002-08-21 920-524 1XXX2XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WI 5489 BRILLION WI
2002-08-21 920-653 0XXX2XXX3XXX5XXX6XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WI 5489 MAPLETON WI
2002-08-21 920-654 1XXX2XXX3XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WI 5489 MISHICOT WI
2002-08-21 920-656 3XXX5XXX6XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WI 5489 NEOSHO WI
2002-08-21 920-657 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WI 5489 TWO RIVERS WI
2002-08-21 920-796 0XXX1XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WI 5489 WHITELAW WI
2002-08-21 920-797 0XXX1XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WI 5489 KIEL WI
2002-08-21 920-798 2XXX3XXX5XXX6XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WI 5489 LEBANON WI
2002-08-21 920-799 6XXX9XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WI 5489 JOHNSBURG WI
2002-05-13 920-267 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WI 5489 OSHKOSH WI
2002-05-13 920-268 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WI 5489 APPLETON WI
2002-05-13 920-471 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WI 5489 GREEN BAY WI
2002-05-13 920-472 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WI 5489 NEW LONDON WI
2002-05-13 920-473 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WI 5489 STURGEONBY WI
2002-03-25 920-545 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 8 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WI 5489 WATERTOWN WI
2002-03-25 920-547 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WI 5489 SHEBOYGAN WI
2002-03-25 920-933 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WI 5489 FONDDU LAC WI
2001-08-12 920-367 0–9 XXXall 10 · 9 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WI 5489 DENMARK WI
2001-06-28 920-341 1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WI 5489 CLYMAN WI
2001-06-08 920-827 2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WI 5489 NEWHOLSTEN WI
— 920-227 0XXX3XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WI 5489 GREEN BAY WI
— 920-243 3XXX7XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WI 5489 APPLETON WI
— 920-264 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WI 5489 GREEN BAY WI
— 920-278 0XXX1XXX2XXX3XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WI 5489 DE PERE WI
— 920-287 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WI 5489 SHEBOYGAN WI
— 920-328 3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WI 5489 GREEN BAY WI
— 920-423 1XXX2XXX3XXX5XXX7XXX8XXX9XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WI 5489 LTL CHUTE WI
— 920-521 3XXX5XXX7XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WI 5489 NEENAH WI
— 920-574 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WI 5489 APPLETON WI
— 920-645 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WI 5489 MANITOWOC WI
— 920-744 3XXX5XXX7XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WI 5489 OSHKOSH WI

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.