NumberResearchRecent prefix assignments
0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/21/2026
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 |
|---|---|---|---|---|---|---|
| — | 281-894 | not yet reported which blocks → | SOUTHWESTERN BELL | 9533 | SATSUMA | TX |
| — | 281-895 | 1XXX2XXX3XXX which blocks → | SOUTHWESTERN BELL | 9533 | BAMMEL | TX |
| — | 281-897 | not yet reported which blocks → | SOUTHWESTERN BELL | 9533 | SATSUMA | TX |
| — | 281-899 | 0XXX5XXX8XXX9XXX · 3 holders which blocks → | SOUTHWESTERN BELL | 9533 | HSTNSUBURB | TX |
| — | 281-907 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → | SOUTHWESTERN BELL | 9533 | SPRING | TX |
| — | 281-909 | 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → | SOUTHWESTERN BELL | 9533 | SEABROOK | TX |
| — | 281-919 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → | SOUTHWESTERN BELL | 9533 | BAMMEL | TX |
| — | 281-920 | 1XXX which blocks → | SOUTHWESTERN BELL | 9533 | HSTNSUBURB | TX |
| — | 281-922 | 0XXX8XXX · 2 holders which blocks → | SOUTHWESTERN BELL | 9533 | HSTNSUBURB | TX |
| — | 281-926 | not yet reported which blocks → | SOUTHWESTERN BELL | 9533 | BAMMEL | TX |
| — | 281-927 | not yet reported which blocks → | SOUTHWESTERN BELL | 9533 | BAMMEL | TX |
| — | 281-929 | 0XXX7XXX8XXX9XXX · 2 holders which blocks → | SOUTHWESTERN BELL | 9533 | HSTNSUBURB | TX |
| — | 281-930 | 5XXX6XXX7XXX · 2 holders which blocks → | SOUTHWESTERN BELL | 9533 | DEER PARK | TX |
| — | 281-931 | not yet reported which blocks → | SOUTHWESTERN BELL | 9533 | HSTNSUBURB | TX |
| — | 281-933 | not yet reported which blocks → | SOUTHWESTERN BELL | 9533 | HSTNSUBURB | TX |
| — | 281-937 | 2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → | SOUTHWESTERN BELL | 9533 | SMITHERSLK | TX |
| — | 281-955 | not yet reported which blocks → | SOUTHWESTERN BELL | 9533 | SATSUMA | TX |
| — | 281-966 | 5XXX8XXX which blocks → | SOUTHWESTERN BELL | 9533 | HSTNSUBURB | TX |
| — | 281-970 | not yet reported which blocks → | SOUTHWESTERN BELL | 9533 | SATSUMA | TX |
| — | 281-978 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX · 3 holders which blocks → | SOUTHWESTERN BELL | 9533 | HSTNSUBURB | TX |
| — | 281-983 | not yet reported which blocks → | SOUTHWESTERN BELL | 9533 | HSTNSUBURB | TX |
| — | 281-985 | 1XXX5XXX9XXX which blocks → | SOUTHWESTERN BELL | 9533 | HSTNSUBURB | TX |
| — | 281-986 | 0XXX7XXX9XXX which blocks → | SOUTHWESTERN BELL | 9533 | HSTNSUBURB | TX |
| — | 281-987 | 4XXX5XXX which blocks → | SOUTHWESTERN BELL | 9533 | HSTNSUBURB | TX |
| — | 281-988 | not yet reported which blocks → | SOUTHWESTERN BELL | 9533 | HSTNSUBURB | TX |
| — | 281-990 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX · 5 holders which blocks → | SOUTHWESTERN BELL | 9533 | APOLLO | TX |
| — | 281-991 | not yet reported which blocks → | SOUTHWESTERN BELL | 9533 | HSTNSUBURB | TX |
| — | 281-992 | 6XXX which blocks → | SOUTHWESTERN BELL | 9533 | FRIENDSWD | TX |
| — | 281-993 | 4XXX6XXX7XXX8XXX · 2 holders which blocks → | SOUTHWESTERN BELL | 9533 | FRIENDSWD | TX |
| — | 281-996 | not yet reported which blocks → | SOUTHWESTERN BELL | 9533 | FRIENDSWD | TX |
| — | 281-997 | not yet reported which blocks → | SOUTHWESTERN BELL | 9533 | HSTNSUBURB | TX |
| — | 281-998 | not yet reported which blocks → | SOUTHWESTERN BELL | 9533 | HSTNSUBURB | TX |
| — | 281-999 | not yet reported which blocks → | SOUTHWESTERN BELL | 9533 | HSTNSUBURB | TX |
Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/21/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.