NumberResearchRecent prefix assignments
5 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 |
|---|---|---|---|---|---|---|
| — | 435-896 | none assigned yet which blocks → | QWEST CORPORATION | 9636 | RICHFIELD | UT |
| — | 435-899 | 2XXX8XXX which blocks → | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT | 6571 | KANAB | UT |
| — | 435-901 | 5XXX6XXX7XXX · 2 holders which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | PARK CITY | UT |
| — | 435-911 | not yet reported which blocks → | MULTIPLE OCN LISTING | MULT | XXXXXXXXXX | UT |
| — | 435-915 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → | ONVOY, LLC - UT | 871E | LOGAN | UT |
| — | 435-919 | 0–9 XXXall 10 · 6 holders which blocks → | ONVOY, LLC - UT | 871E | BRIGHAM CY | UT |
| — | 435-921 | 0XXX which blocks → | TELEPORT COMMUNICATIONS AMERICA, LLC - UT | 7530 | BRIGHAM CY | UT |
| — | 435-928 | not yet reported which blocks → | UT | |||
| — | 435-932 | 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → | COMCAST IP PHONE, LLC | 318J | LOGAN | UT |
| — | 435-938 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - UT | 3231 | LOGAN | UT |
| — | 435-940 | 4XXX which blocks → | QWEST CORPORATION | 9636 | PARK CITY | UT |
| — | 435-946 | not yet reported which blocks → | BEAR LAKE COMMUNICATIONS | 3032 | GARDENCITY | UT |
| — | 435-948 | not yet reported which blocks → | UNION TELEPHONE COMPANY | 013B | GARDENCITY | UT |
| — | 435-950 | not yet reported which blocks → | UT | |||
| — | 435-958 | not yet reported which blocks → | UT | |||
| — | 435-959 | not yet reported which blocks → | UT | |||
| — | 435-962 | 1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | T-MOBILE USA, INC. | 6529 | PARK CITY | UT |
| — | 435-970 | not yet reported which blocks → | UT | |||
| — | 435-976 | not yet reported which blocks → | UT | |||
| — | 435-979 | not yet reported which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | RICHFIELD | UT |
| — | 435-986 | not yet reported which blocks → | QWEST CORPORATION | 9636 | ST GEORGE | UT |
| — | 435-988 | not yet reported which blocks → | UT | |||
| — | 435-990 | 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT | 6571 | BRIAN HEAD | UT |
| — | 435-994 | 2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → | T-MOBILE USA, INC. | 6529 | LOGAN | UT |
| — | 435-999 | 0–9 XXXall 10 · 5 holders which blocks → | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT | 6571 | LOGAN | UT |
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.