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 |
|---|---|---|---|---|---|---|
| 2018-04-26 | 636-292 | 0–9 XXXwhole prefix which blocks → | TELEPORT COMMUNICATIONS AMERICA, LLC - MO | 7218 | CHESTERFLD | MO |
| 2017-03-24 | 636-865 | 0XXX5XXX6XXX · 2 holders which blocks → | TELEPORT COMMUNICATIONS AMERICA, LLC - MO | 6123 | HILLSBORO | MO |
| 2015-06-16 | 636-428 | 0–9 XXXall 10 · 3 holders which blocks → | TELEPORT COMMUNICATIONS AMERICA, LLC - MO | 7218 | HIGH RIDGE | MO |
| 2009-07-08 | 636-543 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX · 6 holders which blocks → | TELEPORT COMMUNICATIONS AMERICA, LLC - MO | 7218 | FSSCRSTLCY | MO |
| 2007-06-06 | 636-283 | 0–9 XXXall 10 · 6 holders which blocks → | TELEPORT COMMUNICATIONS AMERICA, LLC - MO | 7218 | WASHINGTON | MO |
| — | 636-651 | 5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | TELEPORT COMMUNICATIONS AMERICA, LLC - MO | 7218 | FENTON | MO |
| — | 636-681 | 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → | TELEPORT COMMUNICATIONS AMERICA, LLC - MO | 7218 | CHESTERFLD | MO |
| — | 636-685 | 0XXX2XXX · 2 holders which blocks → | TELEPORT COMMUNICATIONS AMERICA, LLC - MO | 7218 | HARVESTER | MO |
| — | 636-686 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → | TELEPORT COMMUNICATIONS AMERICA, LLC - MO | 7218 | MANCHESTER | MO |
| — | 636-688 | 0XXX7XXX8XXX9XXX · 3 holders which blocks → | TELEPORT COMMUNICATIONS AMERICA, LLC - MO | 7218 | ST CHARLES | MO |
| — | 636-689 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX which blocks → | TELEPORT COMMUNICATIONS AMERICA, LLC - MO | 7218 | VALLEYPARK | MO |
| — | 636-695 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → | TELEPORT COMMUNICATIONS AMERICA, LLC - MO | 7218 | DARDENNE | MO |
| — | 636-696 | 3XXX5XXX6XXX8XXX9XXX · 2 holders which blocks → | TELEPORT COMMUNICATIONS AMERICA, LLC - MO | 7218 | OFALLON | MO |
| — | 636-697 | 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → | TELEPORT COMMUNICATIONS AMERICA, LLC - MO | 7218 | ST PETERS | MO |
| — | 636-698 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → | TELEPORT COMMUNICATIONS AMERICA, LLC - MO | 7218 | WENTZVILLE | MO |
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.