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 |
|---|---|---|---|---|---|---|
| 2023-03-07 | 920-813 | 1XXX which blocks → | TWC IP ENABLED SERVICES, LLC | 793K | GILLETT | WI |
| 2022-01-27 | 920-914 | 0XXX1XXX2XXX3XXX4XXX7XXX8XXX9XXX · 6 holders which blocks → | TWC IP ENABLED SERVICES, LLC | 793K | BERLIN | WI |
| 2018-10-30 | 920-502 | 0–9 XXXall 10 · 6 holders which blocks → | TWC IP ENABLED SERVICES, LLC | 793K | NEENAH | WI |
| 2018-08-06 | 920-441 | 0–9 XXXall 10 · 4 holders which blocks → | TWC IP ENABLED SERVICES, LLC | 793K | APPLETON | WI |
| 2010-11-30 | 920-393 | 0–9 XXXall 10 · 4 holders which blocks → | TWC IP ENABLED SERVICES, LLC | 793K | GREEN BAY | WI |
| 2009-05-12 | 920-771 | 0XXX1XXX2XXX3XXX7XXX · 5 holders which blocks → | TWC IP ENABLED SERVICES, LLC | 793K | MILLCENTER | WI |
| 2009-05-11 | 920-503 | 0XXX1XXX2XXX3XXX4XXX6XXX8XXX · 6 holders which blocks → | TWC IP ENABLED SERVICES, LLC | 793K | PULASKI | WI |
| 2009-05-11 | 920-649 | 0XXX2XXX6XXX9XXX · 4 holders which blocks → | TWC IP ENABLED SERVICES, LLC | 793K | ONEIDA | WI |
| 2007-04-10 | 920-881 | 1XXX2XXX3XXX4XXX5XXX6XXX8XXX · 4 holders which blocks → | TWC IP ENABLED SERVICES, LLC | 793K | ST NAZIANZ | WI |
| 2007-04-10 | 920-981 | 1XXX2XXX4XXX8XXX · 3 holders which blocks → | TWC IP ENABLED SERVICES, LLC | 793K | STOCKBDG | WI |
| 2007-03-14 | 920-953 | 3XXX4XXX5XXX6XXX8XXX · 4 holders which blocks → | TWC IP ENABLED SERVICES, LLC | 793K | VALDERS | WI |
| 2006-12-06 | 920-871 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 6 holders which blocks → | TWC IP ENABLED SERVICES, LLC | 793K | HILBERT | WI |
| 2006-08-22 | 920-507 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 7 holders which blocks → | TWC IP ENABLED SERVICES, LLC | 793K | SHERWOOD | WI |
| 2006-08-22 | 920-778 | 0XXX1XXX6XXX7XXX8XXX · 5 holders which blocks → | TWC IP ENABLED SERVICES, LLC | 793K | LARSEN | WI |
| 2005-09-21 | 920-504 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → | TWC IP ENABLED SERVICES, LLC | 793K | SEYMOUR | WI |
| 2004-01-09 | 920-558 | 0–9 XXXall 10 · 4 holders which blocks → | TWC IP ENABLED SERVICES, LLC | 793K | NEENAH | WI |
| 2002-08-29 | 920-385 | 0–9 XXXall 10 · 4 holders which blocks → | TWC IP ENABLED SERVICES, LLC | 793K | OSHKOSH | WI |
| — | 920-364 | 0–9 XXXall 10 · 3 holders which blocks → | TWC IP ENABLED SERVICES, LLC | 793K | APPLETON | WI |
| — | 920-516 | 0–9 XXXall 10 · 8 holders which blocks → | TWC IP ENABLED SERVICES, LLC | 793K | OCONTO | WI |
| — | 920-544 | 0–9 XXXall 10 · 3 holders which blocks → | TWC IP ENABLED SERVICES, LLC | 793K | GREEN BAY | WI |
| — | 920-781 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → | TWC IP ENABLED SERVICES, LLC | 793K | ELKHART LK | WI |
| — | 920-782 | 0XXX1XXX2XXX4XXX6XXX7XXX8XXX · 5 holders which blocks → | TWC IP ENABLED SERVICES, LLC | 793K | CLEVELAND | WI |
| — | 920-828 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 5 holders which blocks → | TWC IP ENABLED SERVICES, LLC | 793K | HOWARDSGRV | 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.