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 |
|---|---|---|---|---|---|---|
| — | 307-686 | not yet reported which blocks → | QWEST CORPORATION | 9636 | GILLETTE | WY |
| — | 307-687 | not yet reported which blocks → | QWEST CORPORATION | 9636 | GILLETTE | WY |
| — | 307-721 | not yet reported which blocks → | QWEST CORPORATION | 9636 | LARAMIE | WY |
| — | 307-732 | not yet reported which blocks → | QWEST CORPORATION | 9636 | JACKSON | WY |
| — | 307-733 | not yet reported which blocks → | QWEST CORPORATION | 9636 | JACKSON | WY |
| — | 307-734 | not yet reported which blocks → | QWEST CORPORATION | 9636 | JACKSON | WY |
| — | 307-735 | 0XXX1XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | QWEST CORPORATION | 9636 | GLENDO | WY |
| — | 307-739 | not yet reported which blocks → | QWEST CORPORATION | 9636 | JACKSON | WY |
| — | 307-742 | not yet reported which blocks → | QWEST CORPORATION | 9636 | LARAMIE | WY |
| — | 307-745 | not yet reported which blocks → | QWEST CORPORATION | 9636 | LARAMIE | WY |
| — | 307-754 | not yet reported which blocks → | QWEST CORPORATION | 9636 | POWELL | WY |
| — | 307-755 | not yet reported which blocks → | QWEST CORPORATION | 9636 | LARAMIE | WY |
| — | 307-766 | not yet reported which blocks → | QWEST CORPORATION | 9636 | LARAMIE | WY |
| — | 307-771 | not yet reported which blocks → | QWEST CORPORATION | 9636 | CHEYENNE | WY |
| — | 307-772 | 1XXX which blocks → | QWEST CORPORATION | 9636 | CHEYENNE | WY |
| — | 307-773 | not yet reported which blocks → | QWEST CORPORATION | 9636 | CHEYENNE | WY |
| — | 307-775 | not yet reported which blocks → | QWEST CORPORATION | 9636 | CHEYENNE | WY |
| — | 307-777 | not yet reported which blocks → | QWEST CORPORATION | 9636 | CHEYENNE | WY |
| — | 307-778 | not yet reported which blocks → | QWEST CORPORATION | 9636 | CHEYENNE | WY |
| — | 307-783 | not yet reported which blocks → | QWEST CORPORATION | 9636 | EVANSTON | WY |
| — | 307-789 | not yet reported which blocks → | QWEST CORPORATION | 9636 | EVANSTON | WY |
| — | 307-828 | 0XXX1XXX5XXX7XXX · 2 holders which blocks → | QWEST CORPORATION | 9636 | KEMMERER | WY |
| — | 307-849 | not yet reported which blocks → | QWEST CORPORATION | 9636 | BORDER | WY |
| — | 307-855 | 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → | QWEST CORPORATION | 9636 | RIVERTON | WY |
| — | 307-856 | not yet reported which blocks → | QWEST CORPORATION | 9636 | RIVERTON | WY |
| — | 307-857 | 8XXX which blocks → | QWEST CORPORATION | 9636 | RIVERTON | WY |
| — | 307-872 | not yet reported which blocks → | QWEST CORPORATION | 9636 | GREENRIVER | WY |
| — | 307-875 | not yet reported which blocks → | QWEST CORPORATION | 9636 | GREENRIVER | WY |
| — | 307-877 | 7XXX8XXX which blocks → | QWEST CORPORATION | 9636 | KEMMERER | WY |
| — | 307-886 | 2XXX4XXX6XXX7XXX8XXX · 4 holders which blocks → | QWEST CORPORATION | 9636 | AFTON | WY |
| — | 307-896 | not yet reported which blocks → | QWEST CORPORATION | 9631 | WBLLFOURCH | WY |
| — | 307-939 | 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → | QWEST CORPORATION | 9636 | WRIGHT | WY |
| — | 307-995 | none assigned yet which blocks → | QWEST CORPORATION | 9636 | CASPER | WY |
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.