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 |
|---|---|---|---|---|---|---|
| 2021-07-29 | 727-284 | 0–9 XXXall 10 · 4 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - FL | 4802 | STPETERSBG | FL |
| 2015-10-30 | 727-312 | 0–9 XXXall 10 · 4 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - FL | 4802 | NWPTRICHEY | FL |
| 2014-04-17 | 727-240 | 0–9 XXXall 10 · 4 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - FL | 4802 | CLEARWATER | FL |
| 2013-02-21 | 727-223 | 0–9 XXXall 10 · 5 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - FL | 4802 | CLEARWATER | FL |
| 2010-12-16 | 727-400 | 0–9 XXXall 10 · 3 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - FL | 4802 | CLEARWATER | FL |
| 2002-08-30 | 727-755 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - FL | 4802 | HUDSON | FL |
| 2002-04-26 | 727-474 | 2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - FL | 4802 | CLEARWATER | FL |
| 2002-04-26 | 727-478 | 5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - FL | 4802 | NWPTRICHEY | FL |
| 2002-04-26 | 727-498 | 2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - FL | 4802 | STPETERSBG | FL |
| 2001-01-04 | 727-748 | 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - FL | 4802 | CLEARWATER | FL |
| — | 727-213 | 4XXX7XXX8XXX · 2 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - FL | 4802 | CLEARWATER | FL |
| — | 727-214 | 4XXX7XXX8XXX which blocks → | LEVEL 3 COMMUNICATIONS, LLC - FL | 4802 | STPETERSBG | FL |
| — | 727-287 | 4XXX5XXX7XXX8XXX · 3 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - FL | 4802 | CLEARWATER | FL |
| — | 727-288 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - FL | 4802 | CLEARWATER | FL |
| — | 727-289 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → | LEVEL 3 COMMUNICATIONS, LLC - FL | 4802 | STPETERSBG | FL |
| — | 727-290 | 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - FL | 4802 | STPETERSBG | FL |
| — | 727-342 | 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - FL | 4802 | STPETERSBG | FL |
| — | 727-359 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - FL | 4802 | NWPTRICHEY | FL |
| — | 727-475 | 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - FL | 4802 | CLEARWATER | FL |
| — | 727-493 | 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - FL | 4802 | TARPON SPG | FL |
| — | 727-565 | 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - FL | 4802 | STPETERSBG | FL |
| — | 727-597 | 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - FL | 4802 | NWPTRICHEY | FL |
| — | 727-645 | 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - FL | 4802 | NWPTRICHEY | FL |
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.