NumberResearchRecent prefix assignments
2 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 |
|---|---|---|---|---|---|---|
| — | 307-877 | 7XXX8XXX which blocks → | QWEST CORPORATION | 9636 | KEMMERER | WY |
| — | 307-878 | not yet reported which blocks → | RANGE TEL COOP INC | 2251 | SO ALZADA | WY |
| — | 307-883 | not yet reported which blocks → | SILVER STAR TEL CO INC | 2295 | FREEDOM | WY |
| — | 307-884 | not yet reported which blocks → | UNION TELEPHONE COMPANY | 013B | AFTON | WY |
| — | 307-885 | not yet reported which blocks → | SILVER STAR TEL CO INC | 2295 | AFTON | WY |
| — | 307-886 | 2XXX4XXX6XXX7XXX8XXX · 4 holders which blocks → | QWEST CORPORATION | 9636 | AFTON | WY |
| — | 307-890 | not yet reported which blocks → | UNION TELEPHONE COMPANY | 013B | FREEDOM | WY |
| — | 307-896 | not yet reported which blocks → | QWEST CORPORATION | 9631 | WBLLFOURCH | WY |
| — | 307-899 | not yet reported which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | CODY | WY |
| — | 307-911 | not yet reported which blocks → | MULTIPLE OCN LISTING | MULT | XXXXXXXXXX | WY |
| — | 307-920 | 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → | T-MOBILE USA, INC. | 6529 | CHEYENNE | WY |
| — | 307-921 | 3XXX4XXX6XXX · 2 holders which blocks → | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WY | 6566 | THERMOPOLS | WY |
| — | 307-922 | 0–9 XXXall 10 · 5 holders which blocks → | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WY | 6566 | ROCK SPG | WY |
| — | 307-939 | 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → | QWEST CORPORATION | 9636 | WRIGHT | WY |
| — | 307-941 | 2XXX which blocks → | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WY | 6566 | NEWCASTLE | WY |
| — | 307-949 | 4XXX9XXX · 2 holders which blocks → | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WY | 6566 | NEWCASTLE | WY |
| — | 307-950 | not yet reported which blocks → | WY | |||
| — | 307-958 | not yet reported which blocks → | WY | |||
| — | 307-959 | not yet reported which blocks → | WY | |||
| — | 307-970 | not yet reported which blocks → | WY | |||
| — | 307-976 | not yet reported which blocks → | WY | |||
| — | 307-977 | not yet reported which blocks → | UNION TELEPHONE COMPANY | 013B | LARAMIE | WY |
| — | 307-988 | not yet reported which blocks → | WY | |||
| — | 307-995 | none assigned yet which blocks → | QWEST CORPORATION | 9636 | CASPER | WY |
| — | 307-996 | 0XXX3XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → | ONVOY, LLC - WY | 450F | CHEYENNE | 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.