All assignees
326 prefixes in 623 · initial assignments from the NANPA CO code file, 09/17/2026
| NPA-NXX | Rate center | OCN | Assigned | Pooled |
|---|---|---|---|---|
| 623-911 | XXXXXXXXXX | MULT | — | — |
| 623-915 | PHOENIX | 9636 | — | — |
| 623-920 | PHOENIX | 630E | 2021-02-03 | Yes |
| 623-925 | PHOENIX | 9636 | — | — |
| 623-930 | PHOENIX | 9636 | — | — |
| 623-931 | PHOENIX | 9636 | — | — |
| 623-932 | PHOENIX | 9636 | — | — |
| 623-933 | PHOENIX | 9636 | — | — |
| 623-934 | PHOENIX | 9636 | — | — |
| 623-935 | PHOENIX | 9636 | — | — |
| 623-936 | PHOENIX | 9636 | — | — |
| 623-937 | PHOENIX | 9636 | — | — |
| 623-939 | PHOENIX | 9636 | — | — |
| 623-950 | — | — | ||
| 623-955 | PHOENIX | 907K | 2025-10-22 | Yes |
| 623-958 | — | — | ||
| 623-959 | — | — | ||
| 623-972 | PHOENIX | 9636 | — | — |
| 623-974 | PHOENIX | 9636 | — | — |
| 623-975 | PHOENIX | 9636 | — | — |
| 623-976 | — | — | ||
| 623-977 | PHOENIX | 9636 | — | — |
| 623-979 | PHOENIX | 9636 | — | — |
| 623-980 | PHOENIX | 6572 | 2001-10-09 | Yes |
| 623-986 | PHOENIX | 6572 | 2006-11-03 | Yes |
| 623-999 | PHOENIX | 630E | 2013-09-26 | Yes |
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.