NumberResearchRecent prefix assignments
0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/25/2026
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 |
|---|---|---|---|---|---|---|
| — | 775-482 | 1XXX which blocks → | CITIZENS TELECOMM CO OF NV DBA FRONTIER COMM OF NV | 2354 | TONOPAH | NV |
| — | 775-485 | 1XXX4XXX5XXX7XXX8XXX · 3 holders which blocks → | CITIZENS TELECOMM CO OF NV DBA FRONTIER COMM OF NV | 2354 | GOLDFIELD | NV |
| — | 775-487 | 1XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → | CITIZENS TELECOMM CO OF NV DBA FRONTIER COMM OF NV | 2354 | MANHATTAN | NV |
| — | 775-664 | not yet reported which blocks → | CITIZENS TELECOMM CO OF NV DBA FRONTIER COMM OF NV | 2354 | WENDOVER | NV |
| — | 775-738 | not yet reported which blocks → | CITIZENS TELECOMM CO OF NV DBA FRONTIER COMM OF NV | 2354 | ELKO | NV |
| — | 775-744 | not yet reported which blocks → | CITIZENS TELECOMM CO OF NV DBA FRONTIER COMM OF NV | 2354 | LEE JIGGS | NV |
| — | 775-748 | not yet reported which blocks → | CITIZENS TELECOMM CO OF NV DBA FRONTIER COMM OF NV | 2354 | ELKO | NV |
| — | 775-752 | not yet reported which blocks → | CITIZENS TELECOMM CO OF NV DBA FRONTIER COMM OF NV | 2354 | WELLS | NV |
| — | 775-753 | not yet reported which blocks → | CITIZENS TELECOMM CO OF NV DBA FRONTIER COMM OF NV | 2354 | ELKO | NV |
| — | 775-754 | not yet reported which blocks → | CITIZENS TELECOMM CO OF NV DBA FRONTIER COMM OF NV | 2354 | CARLIN | NV |
| — | 775-776 | not yet reported which blocks → | CITIZENS TELECOMM CO OF NV DBA FRONTIER COMM OF NV | 2354 | MONTELLO | NV |
| — | 775-777 | none assigned yet which blocks → | CITIZENS TELECOMM CO OF NV DBA FRONTIER COMM OF NV | 2354 | ELKO | NV |
| — | 775-778 | none assigned yet which blocks → | CITIZENS TELECOMM CO OF NV DBA FRONTIER COMM OF NV | 2354 | ELKO | NV |
| — | 775-779 | not yet reported which blocks → | CITIZENS TELECOMM CO OF NV DBA FRONTIER COMM OF NV | 2354 | RUBYVALLEY | NV |
| — | 775-937 | not yet reported which blocks → | CITIZENS TELECOMM CO OF NV DBA FRONTIER COMM OF NV | 2354 | SILVERPEAK | NV |
Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/25/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.