NumberResearchRecent prefix assignments
0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/22/2026
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 |
|---|---|---|---|---|---|---|
| 2017-09-12 | 650-379 | 0–9 XXXall 10 · 7 holders which blocks → | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | SSNFRNCSCO | CA |
| 2007-02-15 | 650-214 | 0–9 XXXwhole prefix which blocks → | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | MT VIEW | CA |
| 2006-12-27 | 650-427 | 0–9 XXXall 10 · 2 holders which blocks → | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | PALO ALTO | CA |
| 2004-04-27 | 650-253 | 0–9 XXXwhole prefix which blocks → | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | MT VIEW | CA |
| — | 650-226 | 3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | SNCRL-BLMT | CA |
| — | 650-238 | 4XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | SSNFRNCSCO | CA |
| — | 650-263 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | MOSS BEACH | CA |
| — | 650-429 | 6XXX8XXX · 2 holders which blocks → | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | MT VIEW | CA |
| — | 650-481 | 5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | REDWOOD CY | CA |
| — | 650-651 | 4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | MILLBRAE | CA |
| — | 650-653 | 1XXX8XXX · 2 holders which blocks → | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | SAN MATEO | CA |
| — | 650-687 | 7XXX8XXX · 2 holders which blocks → | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | PALO ALTO | CA |
| — | 650-719 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | MOSS BEACH | CA |
| — | 650-733 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | PACIFICA | CA |
| — | 650-850 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | WOODSIDE | CA |
Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/22/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.