NumberResearchRecent prefix assignments
0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/20/2026
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.
| Assigned | NPA-NXX | Thousands-blocks taken (last-4 opening) | Code holder | OCN | Rate center | State |
|---|---|---|---|---|---|---|
| 2024-06-17 | 920-971 | 1XXX which blocks → | CHARTER IP ENABLED SERVICES, LLC | 792K | READFIELD | WI |
| 2008-02-28 | 920-774 | 1XXX4XXX6XXX7XXX · 4 holders which blocks → | CHARTER IP ENABLED SERVICES, LLC | 792K | WILD ROSE | WI |
| 2008-02-20 | 920-741 | 0XXX1XXX2XXX4XXX7XXX · 3 holders which blocks → | CHARTER IP ENABLED SERVICES, LLC | 792K | BRUSSELS | WI |
| 2008-02-20 | 920-935 | 1XXX2XXX3XXX9XXX · 4 holders which blocks → | CHARTER IP ENABLED SERVICES, LLC | 792K | PICKETT | WI |
| 2008-02-20 | 920-975 | 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 6 holders which blocks → | CHARTER IP ENABLED SERVICES, LLC | 792K | WAYSIDE | WI |
| 2007-05-11 | 920-859 | 0–9 XXXall 10 · 6 holders which blocks → | CHARTER IP ENABLED SERVICES, LLC | 792K | OMRO | WI |
| 2007-04-26 | 920-520 | 0XXX2XXX4XXX5XXX6XXX7XXX · 5 holders which blocks → | CHARTER IP ENABLED SERVICES, LLC | 792K | FOX LAKE | WI |
| 2007-03-30 | 920-519 | 0XXX1XXX2XXX4XXX5XXX6XXX8XXX9XXX · 7 holders which blocks → | CHARTER IP ENABLED SERVICES, LLC | 792K | BLACKCREEK | WI |
| 2007-03-30 | 920-767 | 0XXX1XXX2XXX3XXX6XXX7XXX8XXX · 6 holders which blocks → | CHARTER IP ENABLED SERVICES, LLC | 792K | MARKESAN | WI |
| 2007-03-30 | 920-807 | 0XXX1XXX2XXX3XXX4XXX6XXX7XXX9XXX · 5 holders which blocks → | CHARTER IP ENABLED SERVICES, LLC | 792K | GREEN LAKE | WI |
| 2007-03-30 | 920-852 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → | CHARTER IP ENABLED SERVICES, LLC | 792K | ROSENDALE | WI |
| 2007-03-30 | 920-896 | 0–9 XXXall 10 · 8 holders which blocks → | CHARTER IP ENABLED SERVICES, LLC | 792K | RIPON | WI |
| 2007-03-30 | 920-938 | 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 8 holders which blocks → | CHARTER IP ENABLED SERVICES, LLC | 792K | SHIOCTON | WI |
| 2006-11-29 | 920-862 | 0XXX1XXX2XXX3XXX8XXX9XXX · 3 holders which blocks → | CHARTER IP ENABLED SERVICES, LLC | 792K | WEYAUWEGA | WI |
| 2006-11-26 | 920-481 | 0–9 XXXall 10 · 6 holders which blocks → | CHARTER IP ENABLED SERVICES, LLC | 792K | PRINCETON | WI |
| 2006-05-25 | 920-670 | 0XXX4XXX6XXX · 3 holders which blocks → | CHARTER IP ENABLED SERVICES, LLC | 792K | JOHNSBURG | WI |
| 2006-01-20 | 920-945 | 0–9 XXXall 10 · 4 holders which blocks → | CHARTER IP ENABLED SERVICES, LLC | 792K | LAKE MILLS | WI |
| 2005-10-11 | 920-818 | 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | CHARTER IP ENABLED SERVICES, LLC | 792K | STURGEONBY | WI |
| 2005-01-27 | 920-350 | 0–9 XXXall 10 · 4 holders which blocks → | CHARTER IP ENABLED SERVICES, LLC | 792K | COLUMBUS | WI |
| 2001-06-18 | 920-363 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 8 holders which blocks → | CHARTER IP ENABLED SERVICES, LLC | 792K | BAILEYSHBR | 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.