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 |
|---|---|---|---|---|---|---|
| 2005-11-28 | 734-605 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 2 holders which blocks → | TELNET WORLDWIDE, INC. | 817J | MAYBEE | MI |
| 2002-04-02 | 734-873 | not yet reported which blocks → | TELNET WORLDWIDE, INC. | 817J | PINCKNEY | MI |
| 2001-03-20 | 734-943 | not yet reported which blocks → | TELNET WORLDWIDE, INC. | 817J | LIVONIA | MI |
| — | 734-298 | not yet reported which blocks → | TELNET WORLDWIDE, INC. | 817J | WAYNE | MI |
| — | 734-310 | not yet reported which blocks → | TELNET WORLDWIDE, INC. | 817J | DUNDEE | MI |
| — | 734-314 | not yet reported which blocks → | TELNET WORLDWIDE, INC. | 817J | GREGORY | MI |
| — | 734-319 | not yet reported which blocks → | TELNET WORLDWIDE, INC. | 817J | ERIE | MI |
| — | 734-321 | not yet reported which blocks → | TELNET WORLDWIDE, INC. | 817J | MAYBEE | MI |
| — | 734-342 | not yet reported which blocks → | TELNET WORLDWIDE, INC. | 817J | MONROE | MI |
| — | 734-370 | not yet reported which blocks → | TELNET WORLDWIDE, INC. | 817J | LAMBERTVL | MI |
| — | 734-372 | not yet reported which blocks → | TELNET WORLDWIDE, INC. | 817J | ANN ARBOR | MI |
| — | 734-376 | not yet reported which blocks → | TELNET WORLDWIDE, INC. | 817J | IDA | MI |
| — | 734-387 | not yet reported which blocks → | TELNET WORLDWIDE, INC. | 817J | TEMPERANCE | MI |
| — | 734-401 | not yet reported which blocks → | TELNET WORLDWIDE, INC. | 817J | SALINE | MI |
| — | 734-438 | not yet reported which blocks → | TELNET WORLDWIDE, INC. | 817J | MAYBEE | MI |
| — | 734-501 | not yet reported which blocks → | TELNET WORLDWIDE, INC. | 817J | DUNDEE | MI |
| — | 734-503 | not yet reported which blocks → | TELNET WORLDWIDE, INC. | 817J | SALINE | MI |
| — | 734-520 | not yet reported which blocks → | TELNET WORLDWIDE, INC. | 817J | IDA | MI |
| — | 734-527 | not yet reported which blocks → | TELNET WORLDWIDE, INC. | 817J | ANN ARBOR | MI |
| — | 734-533 | not yet reported which blocks → | TELNET WORLDWIDE, INC. | 817J | YPSILANTI | MI |
| — | 734-534 | not yet reported which blocks → | TELNET WORLDWIDE, INC. | 817J | LAMBERTVL | MI |
| — | 734-538 | not yet reported which blocks → | TELNET WORLDWIDE, INC. | 817J | TEMPERANCE | MI |
| — | 734-549 | not yet reported which blocks → | TELNET WORLDWIDE, INC. | 817J | ERIE | MI |
| — | 734-553 | not yet reported which blocks → | TELNET WORLDWIDE, INC. | 817J | GREGORY | MI |
| — | 734-571 | not yet reported which blocks → | TELNET WORLDWIDE, INC. | 817J | TRENTON | MI |
| — | 734-573 | not yet reported which blocks → | TELNET WORLDWIDE, INC. | 817J | YPSILANTI | MI |
| — | 734-574 | not yet reported which blocks → | TELNET WORLDWIDE, INC. | 817J | WYANDOTTE | MI |
| — | 734-633 | not yet reported which blocks → | TELNET WORLDWIDE, INC. | 817J | NEW BOSTON | MI |
| — | 734-638 | not yet reported which blocks → | TELNET WORLDWIDE, INC. | 817J | WYANDOTTE | MI |
| — | 734-687 | not yet reported which blocks → | TELNET WORLDWIDE, INC. | 817J | MONROE | MI |
| — | 734-902 | not yet reported which blocks → | TELNET WORLDWIDE, INC. | 817J | WAYNE | MI |
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.