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 |
|---|---|---|---|---|---|---|
| 2025-03-27 | 631-718 | 7XXX9XXX · 2 holders which blocks → | METROPCS, INC. | 5562 | RONKONKOMA | NY |
| 2025-03-27 | 631-934 | 0XXX1XXX7XXX8XXX9XXX · 3 holders which blocks → | METROPCS, INC. | 5562 | BABYLON | NY |
| 2019-04-24 | 631-939 | 0–9 XXXall 10 · 7 holders which blocks → | METROPCS, INC. | 5562 | RIVERHEAD | NY |
| 2018-07-12 | 631-809 | 0–9 XXXall 10 · 3 holders which blocks → | METROPCS, INC. | 5562 | DEER PARK | NY |
| 2017-09-01 | 631-303 | 0–9 XXXall 10 · 3 holders which blocks → | METROPCS, INC. | 5562 | AMITYVILLE | NY |
| 2016-06-07 | 631-381 | 0–9 XXXall 10 · 6 holders which blocks → | METROPCS, INC. | 5562 | RIVERHEAD | NY |
| 2016-04-22 | 631-215 | 0–9 XXXall 10 · 3 holders which blocks → | METROPCS, INC. | 5562 | BRENTWOOD | NY |
| 2013-06-14 | 631-449 | 0–9 XXXall 10 · 5 holders which blocks → | METROPCS, INC. | 5562 | BRENTWOOD | NY |
| 2010-06-01 | 631-336 | 0–9 XXXall 10 · 4 holders which blocks → | METROPCS, INC. | 5562 | BRENTWOOD | NY |
| 2008-09-30 | 631-575 | 0–9 XXXwhole prefix which blocks → | METROPCS, INC. | 5562 | BRENTWOOD | NY |
| 2003-10-21 | 631-278 | 0–9 XXXall 10 · 3 holders which blocks → | METROPCS, INC. | 5562 | BRENTWOOD | NY |
| 2003-09-10 | 631-365 | 0–9 XXXall 10 · 5 holders which blocks → | METROPCS, INC. | 5562 | BRENTWOOD | NY |
| 2003-07-23 | 631-291 | 0–9 XXXall 10 · 5 holders which blocks → | METROPCS, INC. | 5562 | BRENTWOOD | NY |
| 2002-10-21 | 631-276 | none assigned yet which blocks → | METROPCS, INC. | 5562 | HAMPTNBAYS | NY |
| 2002-09-25 | 631-926 | none assigned yet which blocks → | METROPCS, INC. | 5562 | BRENTWOOD | NY |
| 2002-06-26 | 631-433 | none assigned yet which blocks → | METROPCS, INC. | 5562 | BRENTWOOD | NY |
| 2002-06-17 | 631-371 | 0XXX2XXX3XXX4XXX5XXX8XXX · 4 holders which blocks → | METROPCS, INC. | 5562 | STONYBROOK | NY |
| 2002-06-17 | 631-383 | none assigned yet which blocks → | METROPCS, INC. | 5562 | BAY SHORE | NY |
| 2002-06-17 | 631-671 | none assigned yet which blocks → | METROPCS, INC. | 5562 | LINDENHST | NY |
| 2002-06-17 | 631-896 | none assigned yet which blocks → | METROPCS, INC. | 5562 | NORTHPORT | NY |
| 2002-05-14 | 631-384 | none assigned yet which blocks → | METROPCS, INC. | 5562 | SELDEN | NY |
| 2002-04-09 | 631-767 | none assigned yet which blocks → | METROPCS, INC. | 5562 | BRENTWOOD | NY |
| 2001-12-31 | 631-484 | none assigned yet which blocks → | METROPCS, INC. | 5562 | BRENTWOOD | NY |
| 2001-06-27 | 631-872 | none assigned yet which blocks → | METROPCS, INC. | 5562 | BRENTWOOD | NY |
| 2001-04-12 | 631-764 | none assigned yet which blocks → | METROPCS, INC. | 5562 | SELDEN | NY |
| 2001-04-12 | 631-796 | none assigned yet which blocks → | METROPCS, INC. | 5562 | BRENTWOOD | NY |
| 2001-03-15 | 631-445 | none assigned yet which blocks → | METROPCS, INC. | 5562 | BRENTWOOD | NY |
| — | 631-774 | none assigned yet which blocks → | METROPCS, INC. | 5562 | BRENTWOOD | NY |
| — | 631-831 | none assigned yet which blocks → | METROPCS, INC. | 5562 | BRENTWOOD | NY |
| — | 631-855 | 0–9 XXXall 10 · 4 holders which blocks → | METROPCS, INC. | 5562 | DEER PARK | NY |
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.