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 |
|---|---|---|---|---|---|---|
| 2022-08-11 | 484-967 | 0XXX1XXX2XXX3XXX8XXX9XXX · 2 holders which blocks → | COMCAST IP PHONE, LLC | 318J | GLENMOORE | PA |
| 2018-05-02 | 484-878 | 0–9 XXXall 10 · 4 holders which blocks → | COMCAST IP PHONE, LLC | 318J | READING | PA |
| 2016-01-27 | 484-869 | 0–9 XXXall 10 · 5 holders which blocks → | COMCAST IP PHONE, LLC | 318J | READING | PA |
| 2015-05-27 | 484-987 | 0–9 XXXall 10 · 6 holders which blocks → | COMCAST IP PHONE, LLC | 318J | READING | PA |
| 2015-03-24 | 484-915 | 0–9 XXXall 10 · 7 holders which blocks → | COMCAST IP PHONE, LLC | 318J | AVONDALE | PA |
| 2015-01-28 | 484-983 | 0–9 XXXall 10 · 4 holders which blocks → | COMCAST IP PHONE, LLC | 318J | W CHESTER | PA |
| 2014-09-30 | 484-370 | 0–9 XXXall 10 · 8 holders which blocks → | COMCAST IP PHONE, LLC | 318J | PHPHSBZN30 | PA |
| 2014-02-05 | 484-509 | 0–9 XXXall 10 · 5 holders which blocks → | COMCAST IP PHONE, LLC | 318J | READING | PA |
| 2009-04-23 | 484-415 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 5 holders which blocks → | COMCAST IP PHONE, LLC | 318J | BOYERTOWN | PA |
| 2007-07-09 | 484-816 | 0–9 XXXall 10 · 4 holders which blocks → | COMCAST IP PHONE, LLC | 318J | PHPHSBZN11 | PA |
| 2006-08-02 | 484-593 | 0–9 XXXall 10 · 5 holders which blocks → | COMCAST IP PHONE, LLC | 318J | DOWNINGTN | PA |
| 2004-01-13 | 484-266 | 0–9 XXXall 10 · 5 holders which blocks → | COMCAST IP PHONE, LLC | 318J | W CHESTER | PA |
| 2001-03-13 | 484-947 | 1XXX3XXX4XXX6XXX7XXX8XXX9XXX which blocks → | COMCAST IP PHONE, LLC | 318J | W CHESTER | PA |
| — | 484-480 | 0–9 XXXall 10 · 5 holders which blocks → | COMCAST IP PHONE, LLC | 318J | PHPHSBZN11 | PA |
| — | 484-671 | 1XXX2XXX3XXX4XXX6XXX7XXX · 4 holders which blocks → | COMCAST IP PHONE, LLC | 318J | LEESPORT | PA |
| — | 484-732 | 0XXX3XXX7XXX8XXX · 3 holders which blocks → | COMCAST IP PHONE, LLC | 318J | KENNETT SQ | PA |
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.