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 |
|---|---|---|---|---|---|---|
| 2020-09-08 | 573-630 | 0–9 XXXall 10 · 4 holders which blocks → | TELEPORT COMMUNICATIONS AMERICA, LLC - MO | 6123 | BONNETERRE | MO |
| 2019-06-26 | 573-813 | 0XXX1XXX3XXX4XXX6XXX8XXX9XXX · 7 holders which blocks → | TELEPORT COMMUNICATIONS AMERICA, LLC - MO | 6123 | E PRAIRIE | MO |
| 2015-06-17 | 573-702 | 0–9 XXXall 10 · 5 holders which blocks → | TELEPORT COMMUNICATIONS AMERICA, LLC - MO | 7218 | BLOOMSDALE | MO |
| 2011-07-14 | 573-553 | 0XXX3XXX6XXX7XXX · 4 holders which blocks → | TELEPORT COMMUNICATIONS AMERICA, LLC - MO | 7218 | WESTPHALIA | MO |
| 2010-01-18 | 573-708 | 0–9 XXXall 10 · 5 holders which blocks → | TELEPORT COMMUNICATIONS AMERICA, LLC - MO | 7218 | CAPEGIRARD | MO |
| 2009-11-20 | 573-608 | 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 8 holders which blocks → | TELEPORT COMMUNICATIONS AMERICA, LLC - MO | 7218 | STEGNVIEVE | MO |
| 2008-10-01 | 573-891 | 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → | TELEPORT COMMUNICATIONS AMERICA, LLC - MO | 7218 | DEXTER | MO |
| 2008-06-05 | 573-469 | 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → | TELEPORT COMMUNICATIONS AMERICA, LLC - MO | 7218 | JEFFERSNCY | MO |
| — | 573-381 | 0–9 XXXall 10 · 6 holders which blocks → | TELEPORT COMMUNICATIONS AMERICA, LLC - MO | 7218 | CAPEGIRARD | MO |
| — | 573-712 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → | TELEPORT COMMUNICATIONS AMERICA, LLC - MO | 7218 | POPLAR BLF | 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.