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 |
|---|---|---|---|---|---|---|
| — | 210-821 | not yet reported which blocks → | SOUTHWESTERN BELL | 9533 | SANANTONIO | TX |
| — | 210-822 | not yet reported which blocks → | SOUTHWESTERN BELL | 9533 | SANANTONIO | TX |
| — | 210-824 | not yet reported which blocks → | SOUTHWESTERN BELL | 9533 | SANANTONIO | TX |
| — | 210-826 | not yet reported which blocks → | SOUTHWESTERN BELL | 9533 | SANANTONIO | TX |
| — | 210-828 | not yet reported which blocks → | SOUTHWESTERN BELL | 9533 | SANANTONIO | TX |
| — | 210-829 | not yet reported which blocks → | SOUTHWESTERN BELL | 9533 | SANANTONIO | TX |
| — | 210-832 | not yet reported which blocks → | SOUTHWESTERN BELL | 9533 | SANANTONIO | TX |
| — | 210-841 | not yet reported which blocks → | SOUTHWESTERN BELL | 9533 | SANANTONIO | TX |
| — | 210-856 | not yet reported which blocks → | SOUTHWESTERN BELL | 9533 | SANANTONIO | TX |
| — | 210-871 | 0XXX1XXX8XXX9XXX which blocks → | SOUTHWESTERN BELL | 9533 | SANANTONIO | TX |
| — | 210-877 | 4XXX which blocks → | SOUTHWESTERN BELL | 9533 | SANANTONIO | TX |
| — | 210-882 | 0XXX2XXX6XXX7XXX8XXX9XXX which blocks → | SOUTHWESTERN BELL | 9533 | SANANTONIO | TX |
| — | 210-886 | 8XXX which blocks → | SOUTHWESTERN BELL | 9533 | SANANTONIO | TX |
| — | 210-921 | not yet reported which blocks → | SOUTHWESTERN BELL | 9533 | SANANTONIO | TX |
| — | 210-922 | not yet reported which blocks → | SOUTHWESTERN BELL | 9533 | SANANTONIO | TX |
| — | 210-923 | 9XXX which blocks → | SOUTHWESTERN BELL | 9533 | SANANTONIO | TX |
| — | 210-924 | not yet reported which blocks → | SOUTHWESTERN BELL | 9533 | SANANTONIO | TX |
| — | 210-927 | not yet reported which blocks → | SOUTHWESTERN BELL | 9533 | SANANTONIO | TX |
| — | 210-928 | 2XXX5XXX7XXX · 3 holders which blocks → | SOUTHWESTERN BELL | 9533 | SANANTONIO | TX |
| — | 210-930 | not yet reported which blocks → | SOUTHWESTERN BELL | 9533 | SANANTONIO | TX |
| — | 210-932 | 3XXX6XXX8XXX · 3 holders which blocks → | SOUTHWESTERN BELL | 9533 | SANANTONIO | TX |
| — | 210-938 | not yet reported which blocks → | SOUTHWESTERN BELL | 9533 | SANANTONIO | TX |
| — | 210-945 | not yet reported which blocks → | SOUTHWESTERN BELL | 9533 | SANANTONIO | TX |
| — | 210-946 | 0XXX1XXX3XXX4XXX7XXX8XXX9XXX · 3 holders which blocks → | SOUTHWESTERN BELL | 9533 | SANANTONIO | TX |
| — | 210-949 | not yet reported which blocks → | SOUTHWESTERN BELL | 9533 | SANANTONIO | TX |
| — | 210-967 | 3XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → | SOUTHWESTERN BELL | 9533 | SANANTONIO | TX |
| — | 210-977 | 0XXX which blocks → | SOUTHWESTERN BELL | 9533 | SANANTONIO | TX |
| — | 210-978 | 0XXX2XXX3XXX4XXX5XXX6XXX · 4 holders which blocks → | SOUTHWESTERN BELL | 9533 | SANANTONIO | TX |
| — | 210-979 | 1XXX which blocks → | SOUTHWESTERN BELL | 9533 | SANANTONIO | TX |
| — | 210-989 | 0XXX which blocks → | SOUTHWESTERN BELL | 9533 | SANANTONIO | TX |
| — | 210-999 | 0XXX1XXX5XXX9XXX · 2 holders which blocks → | SOUTHWESTERN BELL | 9533 | SANANTONIO | TX |
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.