NumberResearchRecent prefix assignments
0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/19/2026
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 |
|---|---|---|---|---|---|---|
| 2001-06-18 | 262-589 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → | FRONTIER NORTH INC. - WI | 0886 | SLINGER | WI |
| 2001-06-08 | 262-529 | 3XXX7XXX9XXX · 2 holders which blocks → | FRONTIER NORTH INC. - WI | 0886 | BELGIUM | WI |
| — | 262-275 | 4XXX7XXX · 2 holders which blocks → | FRONTIER NORTH INC. - WI | 0886 | WALWORTH | WI |
| — | 262-285 | 0XXX1XXX2XXX5XXX · 4 holders which blocks → | FRONTIER NORTH INC. - WI | 0886 | BELGIUM | WI |
| — | 262-626 | 0XXX7XXX · 2 holders which blocks → | FRONTIER NORTH INC. - WI | 0886 | KEWASKUM | WI |
| — | 262-629 | 0XXX2XXX3XXX6XXX7XXX8XXX · 2 holders which blocks → | FRONTIER NORTH INC. - WI | 0886 | ALLENTON | WI |
| — | 262-644 | 3XXX which blocks → | FRONTIER NORTH INC. - WI | 0886 | SLINGER | WI |
| — | 262-692 | 0XXX4XXX5XXX · 3 holders which blocks → | FRONTIER NORTH INC. - WI | 0886 | WAUBEKA | WI |
| — | 262-724 | 0XXX1XXX2XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | FRONTIER NORTH INC. - WI | 0886 | DARIEN | WI |
| — | 262-843 | 5XXX6XXX7XXX · 3 holders which blocks → | FRONTIER NORTH INC. - WI | 0886 | SALEM | WI |
| — | 262-857 | 0XXX which blocks → | FRONTIER NORTH INC. - WI | 0886 | BRISTOL | WI |
| — | 262-862 | 4XXX8XXX · 2 holders which blocks → | FRONTIER NORTH INC. - WI | 0886 | TREVOR | WI |
| — | 262-877 | 1XXX7XXX · 2 holders which blocks → | FRONTIER NORTH INC. - WI | 0886 | TWIN LAKES | WI |
| — | 262-889 | 1XXX3XXX5XXX6XXX7XXX9XXX · 6 holders which blocks → | FRONTIER NORTH INC. - WI | 0886 | SILVERLAKE | WI |
Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.