All assignees
315 prefixes in 551 · initial assignments from the NANPA CO code file, 09/17/2026
| NPA-NXX | Rate center | OCN | Assigned | Pooled |
|---|---|---|---|---|
| 551-900 | DUMONT | 637C | — | Yes |
| 551-911 | XXXXXXXXXX | MULT | — | — |
| 551-946 | HACKENSACK | 965H | 2020-10-14 | Yes |
| 551-950 | — | — | ||
| 551-955 | WYCKOFF | 965H | 2021-08-11 | Yes |
| 551-958 | — | — | ||
| 551-959 | — | — | ||
| 551-966 | FAIR LAWN | 516J | 2022-03-03 | Yes |
| 551-976 | XXXXXXXXXX | MULT | — | — |
| 551-990 | XXXXXXXXXX | MULT | 2002-03-06 | — |
| 551-995 | OAKLAND | 637C | 2024-11-20 | Yes |
| 551-996 | HACKENSACK | 7142 | 2007-07-17 | Yes |
| 551-997 | JERSEYCITY | 637C | 2024-09-26 | Yes |
| 551-998 | JERSEYCITY | 6623 | 2001-10-17 | Yes |
| 551-999 | HACKENSACK | 637C | — | 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.