All assignees
382 prefixes in 857 · initial assignments from the NANPA CO code file, 09/17/2026
| NPA-NXX | Rate center | OCN | Assigned | Pooled |
|---|---|---|---|---|
| 857-678 | BELMONT | 892D | 2021-04-02 | Yes |
| 857-688 | DORCHESTER | 965H | 2021-10-26 | Yes |
| 857-693 | ROXBURY | 516J | 2022-02-15 | Yes |
| 857-700 | — | — | ||
| 857-701 | ROXBURY | 6889 | 2014-01-15 | Yes |
| 857-702 | BOSTON | 551G | 2014-02-07 | Yes |
| 857-703 | HYDE PARK | 6387 | 2014-07-28 | Yes |
| 857-706 | CAMBRIDGE | 4018 | — | Yes |
| 857-707 | BROOKLINE | 6387 | 2014-10-10 | Yes |
| 857-711 | XXXXXXXXXX | MULT | — | — |
| 857-719 | JAMAICA PL | 5562 | 2002-07-30 | Yes |
| 857-728 | JAMAICA PL | 7229 | 2001-03-27 | Yes |
| 857-737 | WATERTOWN | 516J | 2022-03-22 | Yes |
| 857-746 | BROOKLINE | 516J | 2022-02-09 | Yes |
| 857-753 | BOSTON | 6387 | 2005-08-09 | Yes |
| 857-754 | QUINCY | 892D | 2020-12-08 | Yes |
| 857-755 | QUINCY | 965H | 2020-09-03 | Yes |
| 857-756 | CAMBRIDGE | 0334 | 2005-07-26 | Yes |
| 857-757 | CAMBRIDGE | 507J | 2015-03-09 | Yes |
| 857-758 | BOSTON | 965H | 2021-04-27 | Yes |
| 857-760 | WATERTOWN | 990E | 2016-06-21 | Yes |
| 857-762 | BOSTON | 5562 | 2016-07-18 | Yes |
| 857-763 | BOSTON | 6889 | 2016-07-22 | Yes |
| 857-766 | SO BOSTON | 965H | 2020-07-21 | Yes |
| 857-767 | BOSTON | 516J | 2022-01-07 | Yes |
| 857-770 | BOSTON | 116E | 2014-12-23 | Yes |
| 857-772 | BOSTON | 6387 | 2016-07-27 | Yes |
| 857-773 | JAMAICA PL | 5562 | 2016-09-12 | Yes |
| 857-776 | CHELSEA | 4018 | 2001-06-29 | Yes |
| 857-777 | CAMBRIDGE | 268F | 2012-03-05 | Yes |
| 857-788 | BOSTON | 622J | 2021-08-20 | Yes |
| 857-799 | CAMBRIDGE | 321J | 2018-11-06 | Yes |
| 857-800 | BOSTON | 892D | 2015-03-20 | Yes |
| 857-810 | BOSTON | 892D | 2021-03-11 | Yes |
| 857-811 | XXXXXXXXXX | MULT | — | — |
| 857-814 | XXXXXXXXXX | 9102 | — | — |
| 857-816 | WINTHROP | 7229 | 2001-03-20 | Yes |
| 857-822 | SOMERVILLE | 624H | 2024-11-07 | Yes |
| 857-829 | CAMBRIDGE | 6889 | 2002-08-13 | Yes |
| 857-832 | BRIGHTON | 516J | 2022-02-11 | Yes |
| 857-833 | WINTHROP | 624H | 2024-11-07 | Yes |
| 857-837 | CHARLESTN | 892D | 2020-05-28 | Yes |
| 857-847 | DORCHESTER | 624H | 2021-03-17 | Yes |
| 857-855 | BOSTON | 892D | 2021-01-25 | Yes |
| 857-856 | CAMBRIDGE | 892D | 2015-03-18 | Yes |
| 857-857 | NEWTON | 624H | 2024-11-07 | Yes |
| 857-858 | NEWTON | 892D | 2020-05-13 | Yes |
| 857-867 | BROOKLINE | 624H | 2021-03-17 | Yes |
| 857-869 | BOSTON | 6889 | 2007-07-23 | Yes |
| 857-877 | BRIGHTON | 892D | 2020-05-13 | Yes |
| 857-880 | BOSTON | 732H | 2015-11-23 | Yes |
| 857-881 | BOSTON | 193E | 2026-06-30 | Yes |
| 857-887 | JAMAICA PL | 624H | 2020-12-18 | Yes |
| 857-888 | EVERETT | 5562 | 2002-07-30 | Yes |
| 857-891 | BOSTON | 6889 | 2001-04-02 | — |
| 857-895 | BOSTON | 6387 | 2017-02-02 | Yes |
| 857-900 | XXXXXXXXXX | 9102 | — | — |
| 857-911 | XXXXXXXXXX | MULT | — | — |
| 857-919 | BRIGHTON | 6889 | 2001-04-02 | Yes |
| 857-920 | CAMBRIDGE | 9102 | — | — |
| 857-928 | CAMBRIDGE | 6889 | 2001-08-03 | Yes |
| 857-930 | BOSTON | 6889 | 2014-06-10 | Yes |
| 857-931 | BOSTON | 9102 | — | — |
| 857-939 | QUINCY | 6387 | 2001-06-15 | Yes |
| 857-940 | — | — | ||
| 857-944 | BOSTON | 4036 | 2024-11-12 | Yes |
| 857-950 | — | — | ||
| 857-957 | BOSTON | 756G | 2014-09-30 | Yes |
| 857-958 | — | — | ||
| 857-959 | — | — | ||
| 857-961 | BRIGHTON | 6889 | 2023-01-09 | Yes |
| 857-971 | CHARLESTN | 892D | 2016-05-09 | Yes |
| 857-972 | BOSTON | 4018 | 2015-07-29 | Yes |
| 857-976 | — | — | ||
| 857-989 | NEWTON | 4036 | 2024-11-11 | Yes |
| 857-990 | BOSTON | 139F | 2015-09-22 | Yes |
| 857-991 | BOSTON | 318J | 2001-06-19 | Yes |
| 857-995 | SOMERVILLE | 892D | — | Yes |
| 857-996 | BOSTON | 7229 | — | Yes |
| 857-997 | SOMERVILLE | 321J | — | Yes |
| 857-998 | CAMBRIDGE | 6387 | 2001-05-03 | Yes |
| 857-999 | CAMBRIDGE | 268F | 2012-05-23 | 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.