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 |
|---|---|---|---|---|---|---|
| — | 605-985 | not yet reported which blocks → | GOLDEN WEST TEL COOP INC DBA GOLDEN WEST TELECOMM | 1659 | ENNING | SD |
| — | 605-987 | 7XXX8XXX9XXX · 3 holders which blocks → | QWEST CORPORATION | 9631 | CANTON | SD |
| — | 605-988 | 4XXX6XXX7XXX8XXX · 3 holders which blocks → | QWEST CORPORATION | 9631 | SIOUX FLS | SD |
| — | 605-993 | not yet reported which blocks → | GOLDEN WEST TEL COOP INC DBA GOLDEN WEST TELECOMM | 1659 | WASTA | SD |
| — | 605-994 | none assigned yet which blocks → | JAMES VALLEY COOPERATIVE TELEPHONE COMPANY | 1664 | HECLA | SD |
| — | 605-995 | not yet reported which blocks → | QWEST CORPORATION | 9631 | MITCHELL | SD |
| — | 605-996 | not yet reported which blocks → | QWEST CORPORATION | 9631 | MITCHELL | SD |
| — | 605-997 | 0XXX1XXX4XXX6XXX7XXX8XXX · 4 holders which blocks → | QWEST CORPORATION | 9631 | FLANDREAU | SD |
| — | 605-999 | not yet reported which blocks → | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - SD | 6569 | MITCHELL | SD |
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.