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 |
|---|---|---|---|---|---|---|
| — | 661-332 | not yet reported which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | BKFD MAIN | CA |
| — | 661-333 | not yet reported which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | BKFD MAIN | CA |
| — | 661-345 | not yet reported which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | BKFD MAIN | CA |
| — | 661-400 | not yet reported which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | PLDL PLDL | CA |
| — | 661-406 | not yet reported which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | PLDL PLDL | CA |
| — | 661-435 | not yet reported which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | PLDL PLDL | CA |
| — | 661-496 | not yet reported which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | BKFD MAIN | CA |
| — | 661-586 | not yet reported which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | DELANO | CA |
| — | 661-609 | not yet reported which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | LANCASTER | CA |
| — | 661-623 | 7XXX8XXX9XXX which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | TAFT | CA |
| — | 661-644 | 7XXX8XXX9XXX which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | SNCA NHCS | CA |
| — | 661-645 | not yet reported which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | SNCA NHCS | CA |
| — | 661-703 | not yet reported which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | BKFD MAIN | CA |
| — | 661-706 | not yet reported which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | BKFD MAIN | CA |
| — | 661-754 | 2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | MOJAVE | CA |
| — | 661-755 | not yet reported which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | SNCA NHCS | CA |
| — | 661-878 | 7XXX8XXX9XXX · 2 holders which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | PLDL PLDL | CA |
| — | 661-903 | 3XXX4XXX5XXX7XXX8XXX9XXX · 2 holders which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | ARVIN | CA |
| — | 661-910 | 4XXX5XXX7XXX8XXX9XXX which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | SHAFTER | CA |
| — | 661-916 | 0XXX6XXX7XXX8XXX9XXX which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | LANCASTER | CA |
| — | 661-917 | not yet reported which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | LANCASTER | CA |
| — | 661-965 | not yet reported which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | PLDL PLDL | CA |
| — | 661-972 | 3XXX9XXX which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | TEHACHAPI | CA |
| — | 661-992 | not yet reported which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | PLDL PLDL | CA |
| — | 661-993 | not yet reported which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | SNCA NHCS | CA |
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.