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 |
|---|---|---|---|---|---|---|
| 2025-04-03 | 904-961 | 4XXX which blocks → | COMCAST IP PHONE, LLC | 318J | KINGSLEYLK | FL |
| 2015-04-30 | 904-559 | 0–9 XXXall 10 · 7 holders which blocks → | COMCAST IP PHONE, LLC | 318J | JACKSONVL | FL |
| 2014-10-03 | 904-606 | 0–9 XXXall 10 · 4 holders which blocks → | COMCAST IP PHONE, LLC | 318J | MIDDLEBURG | FL |
| 2012-04-02 | 904-503 | 0–9 XXXall 10 · 2 holders which blocks → | COMCAST IP PHONE, LLC | 318J | JACKSONVL | FL |
| 2007-04-23 | 904-397 | 0–9 XXXall 10 · 2 holders which blocks → | COMCAST IP PHONE, LLC | 318J | MACCLENNY | FL |
| 2007-04-23 | 904-409 | 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 6 holders which blocks → | COMCAST IP PHONE, LLC | 318J | SANDERSON | FL |
| 2006-03-14 | 904-628 | 0–9 XXXall 10 · 5 holders which blocks → | COMCAST IP PHONE, LLC | 318J | CALLAHAN | FL |
| 2005-12-29 | 904-647 | 0–9 XXXall 10 · 3 holders which blocks → | COMCAST IP PHONE, LLC | 318J | JACKSONVL | FL |
| 2005-05-26 | 904-748 | 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → | COMCAST IP PHONE, LLC | 318J | MAXVILLE | FL |
| 2005-04-14 | 904-217 | 0–9 XXXall 10 · 4 holders which blocks → | COMCAST IP PHONE, LLC | 318J | ST JOHNS | FL |
| 2001-02-26 | 904-551 | 8XXX which blocks → | COMCAST IP PHONE, LLC | 318J | JACKSONVL | FL |
| — | 904-310 | 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → | COMCAST IP PHONE, LLC | 318J | FERNADNBCH | FL |
| — | 904-342 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | COMCAST IP PHONE, LLC | 318J | ST JOHNS | FL |
| — | 904-372 | 1XXX2XXX3XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → | COMCAST IP PHONE, LLC | 318J | JACKSOLBCH | FL |
| — | 904-373 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → | COMCAST IP PHONE, LLC | 318J | PNTVDRABCH | FL |
| — | 904-374 | not yet reported which blocks → | COMCAST IP PHONE, LLC | 318J | JACKSONVL | FL |
| — | 904-375 | 3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → | COMCAST IP PHONE, LLC | 318J | ORANGEPARK | FL |
| — | 904-379 | not yet reported which blocks → | COMCAST IP PHONE, LLC | 318J | JACKSONVL | FL |
| — | 904-406 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → | COMCAST IP PHONE, LLC | 318J | MIDDLEBURG | FL |
| — | 904-531 | 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → | COMCAST IP PHONE, LLC | 318J | GREENCVSPG | FL |
| — | 904-619 | not yet reported which blocks → | COMCAST IP PHONE, LLC | 318J | JACKSONVL | FL |
| — | 904-683 | not yet reported which blocks → | COMCAST IP PHONE, LLC | 318J | JACKSONVL | 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.