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19 prefixes in 661 · initial assignments from the NANPA CO code file, 09/17/2026
| NPA-NXX | Rate center | OCN | Assigned | Pooled |
|---|---|---|---|---|
| 661-209 | PLDL AGDL | 899D | 2002-02-11 | Yes |
| 661-212 | SNCA SGCC | 899D | 2002-02-11 | Yes |
| 661-227 | PLDL PLDL | 899D | 2016-10-10 | Yes |
| 661-312 | SNCA NHCS | 899D | — | Yes |
| 661-313 | SNCA SGCC | 899D | — | Yes |
| 661-402 | PLDL AGDL | 899D | 2011-02-04 | Yes |
| 661-409 | PLDL PLDL | 899D | 2017-06-30 | Yes |
| 661-417 | SNCA NHCS | 899D | 2017-06-30 | Yes |
| 661-485 | PLDL PLDL | 899D | 2014-01-08 | Yes |
| 661-486 | PLDL AGDL | 899D | 2014-03-21 | Yes |
| 661-502 | SNCA NHCS | 899D | 2020-05-27 | Yes |
| 661-510 | SNCA NHCS | 899D | — | Yes |
| 661-512 | PLDL AGDL | 899D | 2020-09-23 | Yes |
| 661-544 | PLDL PLDL | 899D | 2010-01-14 | Yes |
| 661-592 | SNCA SGCC | 899D | 2015-06-09 | Yes |
| 661-621 | SNCA SGCC | 899D | — | Yes |
| 661-670 | SNCA NHCS | 899D | — | Yes |
| 661-810 | PLDL PLDL | 899D | — | Yes |
| 661-857 | SNCA NHCS | 899D | — | 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.