NumberResearchRecent prefix assignments
0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/26/2026
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 |
|---|---|---|---|---|---|---|
| — | 217-887 | 0XXX3XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → | FRONTIER NORTH, INC. - IL | 1015 | METCALF | IL |
| — | 217-894 | 3XXX4XXX8XXX · 2 holders which blocks → | FRONTIER NORTH, INC. - IL | 1015 | CLAYTON | IL |
| — | 217-896 | 4XXX6XXX8XXX9XXX · 3 holders which blocks → | FRONTIER NORTH, INC. - IL | 1015 | HOMER | IL |
| — | 217-927 | 2XXX3XXX7XXX · 2 holders which blocks → | FRONTIER NORTH, INC. - IL | 1015 | PATTERSON | IL |
| — | 217-934 | 0XXX4XXX · 2 holders which blocks → | FRONTIER NORTH, INC. - IL | 1015 | CLINTON | IL |
| — | 217-935 | not yet reported which blocks → | FRONTIER NORTH, INC. - IL | 1015 | CLINTON | IL |
| — | 217-937 | 5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → | FRONTIER NORTH, INC. - IL | 1015 | CLINTON | IL |
| — | 217-942 | 7XXX which blocks → | FRONTIER NORTH, INC. - IL | 1015 | CARROLLTON | IL |
| — | 217-944 | 1XXX4XXX · 2 holders which blocks → | FRONTIER NORTH, INC. - IL | 1015 | KENNEY | IL |
| — | 217-945 | 4XXX5XXX7XXX · 2 holders which blocks → | FRONTIER NORTH, INC. - IL | 1015 | HILLVIEW | IL |
| — | 217-947 | 1XXX4XXX6XXX · 3 holders which blocks → | FRONTIER NORTH, INC. - IL | 1015 | ELKHART | IL |
| — | 217-949 | 0XXX9XXX · 2 holders which blocks → | FRONTIER NORTH, INC. - IL | 1015 | WAYNESVL | IL |
| — | 217-965 | 0XXX2XXX6XXX7XXX8XXX · 4 holders which blocks → | FRONTIER NORTH, INC. - IL | 1015 | VIRDEN | IL |
| — | 217-983 | 3XXX4XXX7XXX · 2 holders which blocks → | FRONTIER NORTH, INC. - IL | 1015 | ELDRED | IL |
Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/26/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.