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 |
|---|---|---|---|---|---|---|
| 2009-02-10 | 610-679 | 0–9 XXXall 10 · 9 holders which blocks → | METROPCS, INC. | 5562 | COATESVL | PA |
| 2002-09-27 | 610-550 | 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → | METROPCS, INC. | 5562 | PHPHSBZN22 | PA |
| 2002-09-27 | 610-551 | 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → | METROPCS, INC. | 5562 | PHPHSBZN30 | PA |
| 2002-09-27 | 610-710 | 4XXX5XXX7XXX · 3 holders which blocks → | METROPCS, INC. | 5562 | PHPHSBZN26 | PA |
| — | 610-580 | 0XXX2XXX which blocks → | METROPCS, INC. | 5562 | PHPHSBZN24 | PA |
| — | 610-620 | 0–9 XXXall 10 · 5 holders which blocks → | METROPCS, INC. | 5562 | W CHESTER | PA |
| — | 610-633 | none assigned yet which blocks → | METROPCS, INC. | 5562 | PHPHSBZN28 | PA |
| — | 610-637 | none assigned yet which blocks → | METROPCS, INC. | 5562 | PHPHSBZN28 | PA |
| — | 610-656 | none assigned yet which blocks → | METROPCS, INC. | 5562 | PHPHSBZN28 | PA |
| — | 610-803 | 0–9 XXXall 10 · 3 holders which blocks → | METROPCS, INC. | 5562 | PHPHSBZN17 | PA |
| — | 610-842 | none assigned yet which blocks → | METROPCS, INC. | 5562 | PHPHSBZN28 | PA |
| — | 610-986 | 0XXX2XXX · 2 holders which blocks → | METROPCS, INC. | 5562 | PHPHSBZN24 | 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.