SPOK, INC.
33 prefixes in 312 · initial assignments from the NANPA CO code file, 09/17/2026
| NPA-NXX | Rate center | OCN | Assigned | Pooled |
|---|---|---|---|---|
| 312-249 | CHICGOZN01 | 6630 | — | — |
| 312-250 | CHICGOZN01 | 6630 | — | — |
| 312-271 | CHICGOZN01 | 6630 | — | — |
| 312-272 | CHICGOZN01 | 6630 | — | — |
| 312-289 | CHICGOZN01 | 6630 | — | — |
| 312-290 | CHICGOZN01 | 6630 | — | — |
| 312-295 | LA GRANGE | 6630 | — | — |
| 312-299 | CHICGOZN01 | 6630 | — | — |
| 312-349 | CHICGOZN01 | 6630 | — | — |
| 312-359 | CHICGOZN01 | 6630 | — | — |
| 312-365 | CHICGOZN01 | 6630 | — | — |
| 312-367 | LA GRANGE | 6630 | — | — |
| 312-370 | CHICGOZN01 | 6630 | — | — |
| 312-378 | CHICGOZN01 | 6630 | — | — |
| 312-387 | CHICGOZN01 | 6630 | — | — |
| 312-389 | CHICGOZN01 | 6630 | — | — |
| 312-398 | CHICGOZN01 | 6630 | — | — |
| 312-418 | CHICGOZN01 | 6630 | — | — |
| 312-484 | CHICGOZN01 | 6630 | — | — |
| 312-490 | CHICGOZN01 | 6630 | — | — |
| 312-495 | CHICGOZN01 | 6630 | — | — |
| 312-512 | CHICGOZN01 | 6630 | — | — |
| 312-562 | CHICGOZN01 | 6630 | — | — |
| 312-571 | CHICGOZN01 | 6630 | — | — |
| 312-657 | CHICGOZN01 | 6630 | — | — |
| 312-677 | CHICGOZN01 | 6630 | — | — |
| 312-688 | CHICGOZN01 | 6630 | — | — |
| 312-717 | LA GRANGE | 6630 | — | — |
| 312-851 | CHICGOZN01 | 6630 | — | — |
| 312-891 | CHICGOZN01 | 6630 | — | — |
| 312-901 | CHICGOZN01 | 6630 | — | — |
| 312-941 | CHICGOZN01 | 6630 | — | — |
| 312-963 | CHICGOZN01 | 6630 | — | — |
These are initial assignees from NANPA CO-code records — because of number portability, the current serving carrier of individual numbers may differ. Bulk export requires a membership.