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 |
|---|---|---|---|---|---|---|
| 2015-04-13 | 415-304 | 0–9 XXXall 10 · 4 holders which blocks → | METROPCS, INC. | 5562 | SNFC CNTRL | CA |
| 2013-01-29 | 415-635 | 0–9 XXXall 10 · 4 holders which blocks → | METROPCS, INC. | 5562 | SNFC CNTRL | CA |
| 2012-10-09 | 415-654 | 0–9 XXXall 10 · 3 holders which blocks → | METROPCS, INC. | 5562 | SNFC CNTRL | CA |
| 2012-04-12 | 415-580 | 0–9 XXXall 10 · 6 holders which blocks → | METROPCS, INC. | 5562 | SNFC CNTRL | CA |
| 2001-10-18 | 415-877 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | METROPCS, INC. | 5562 | MILLVALLEY | CA |
| 2001-09-21 | 415-261 | 6XXX7XXX8XXX9XXX · 2 holders which blocks → | METROPCS, INC. | 5562 | SAN RAFAEL | CA |
| 2001-09-21 | 415-756 | not yet reported which blocks → | METROPCS, INC. | 5562 | SNFC CNTRL | CA |
| 2001-09-21 | 415-879 | 5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → | METROPCS, INC. | 5562 | MILLVALLEY | CA |
| 2001-08-22 | 415-724 | not yet reported which blocks → | METROPCS, INC. | 5562 | SNFC MT-EV | CA |
| 2001-03-22 | 415-871 | 0XXX2XXX · 2 holders which blocks → | METROPCS, INC. | 5562 | SNFC CNTRL | CA |
| — | 415-559 | none assigned yet which blocks → | METROPCS, INC. | 5562 | SNFC CNTRL | CA |
| — | 415-574 | 0–9 XXXall 10 · 3 holders which blocks → | METROPCS, INC. | 5562 | SNFC MT-EV | CA |
| — | 415-596 | none assigned yet which blocks → | METROPCS, INC. | 5562 | SNFC CNTRL | CA |
| — | 415-637 | none assigned yet which blocks → | METROPCS, INC. | 5562 | SNFC CNTRL | CA |
| — | 415-716 | none assigned yet which blocks → | METROPCS, INC. | 5562 | SNFC CNTRL | CA |
| — | 415-748 | 3XXX5XXX9XXX · 3 holders which blocks → | METROPCS, INC. | 5562 | SNFC CNTRL | CA |
| — | 415-760 | none assigned yet which blocks → | METROPCS, INC. | 5562 | SNFC CNTRL | CA |
| — | 415-786 | none assigned yet which blocks → | METROPCS, INC. | 5562 | SNFC CNTRL | CA |
| — | 415-845 | none assigned yet which blocks → | METROPCS, INC. | 5562 | SNFC CNTRL | CA |
| — | 415-846 | none assigned yet which blocks → | METROPCS, INC. | 5562 | SNFC CNTRL | CA |
| — | 415-902 | none assigned yet which blocks → | METROPCS, INC. | 5562 | SNFC CNTRL | CA |
| — | 415-948 | 0XXX2XXX · 2 holders which blocks → | METROPCS, INC. | 5562 | SNFC CNTRL | CA |
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.