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 |
|---|---|---|---|---|---|---|
| — | 816-924 | 8XXX9XXX which blocks → | SOUTHWESTERN BELL | 9533 | KANSASCITY | MO |
| — | 816-926 | not yet reported which blocks → | SOUTHWESTERN BELL | 9533 | KANSASCITY | MO |
| — | 816-929 | 0XXX1XXX4XXX5XXX6XXX8XXX9XXX · 2 holders which blocks → | SOUTHWESTERN BELL | 9533 | KANSASCITY | MO |
| — | 816-931 | not yet reported which blocks → | SOUTHWESTERN BELL | 9533 | KANSASCITY | MO |
| — | 816-932 | not yet reported which blocks → | SOUTHWESTERN BELL | 9533 | KANSASCITY | MO |
| — | 816-936 | not yet reported which blocks → | SOUTHWESTERN BELL | 9533 | KANSASCITY | MO |
| — | 816-940 | not yet reported which blocks → | SOUTHWESTERN BELL | 9533 | XXXXXXXXXX | MO |
| — | 816-941 | not yet reported which blocks → | SOUTHWESTERN BELL | 9533 | KANSASCITY | MO |
| — | 816-942 | not yet reported which blocks → | SOUTHWESTERN BELL | 9533 | KANSASCITY | MO |
| — | 816-943 | 9XXX which blocks → | SOUTHWESTERN BELL | 9533 | KANSASCITY | MO |
| — | 816-960 | not yet reported which blocks → | SOUTHWESTERN BELL | 9533 | KANSASCITY | MO |
| — | 816-965 | 1XXX3XXX7XXX · 3 holders which blocks → | SOUTHWESTERN BELL | 9533 | KANSASCITY | MO |
| — | 816-966 | not yet reported which blocks → | SOUTHWESTERN BELL | 9533 | KANSASCITY | MO |
| — | 816-968 | 9XXX which blocks → | SOUTHWESTERN BELL | 9533 | KANSASCITY | MO |
| — | 816-969 | 0XXX9XXX which blocks → | SOUTHWESTERN BELL | 9533 | KANSASCITY | MO |
| — | 816-979 | 1XXX2XXX3XXX · 2 holders which blocks → | SOUTHWESTERN BELL | 9533 | KANSASCITY | MO |
| — | 816-983 | not yet reported which blocks → | SOUTHWESTERN BELL | 9533 | KANSASCITY | MO |
| — | 816-986 | 0XXX7XXX8XXX9XXX · 2 holders which blocks → | SOUTHWESTERN BELL | 9533 | KANSASCITY | MO |
| — | 816-995 | not yet reported which blocks → | SOUTHWESTERN BELL | 9533 | KANSASCITY | MO |
| — | 816-996 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → | SOUTHWESTERN BELL | 9533 | LEAVEHLSNG | MO |
| — | 816-997 | 9XXX which blocks → | SOUTHWESTERN BELL | 9533 | KANSASCITY | MO |
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.