MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT
37 prefixes in 203 · initial assignments from the NANPA CO code file, 09/17/2026
| NPA-NXX | Rate center | OCN | Assigned | Pooled |
|---|---|---|---|---|
| 203-277 | OLDGRNWICH | 7230 | 2003-04-16 | Yes |
| 203-280 | DARIEN | 7230 | 2004-03-24 | Yes |
| 203-293 | WESTPORT | 7230 | — | Yes |
| 203-295 | NORWALK | 7230 | — | Yes |
| 203-296 | BRIDGEPORT | 7230 | — | Yes |
| 203-297 | DANBURY | 7230 | — | Yes |
| 203-307 | FAIRFIELD | 7230 | 2005-01-31 | Yes |
| 203-310 | NEW CANAAN | 7230 | 2003-04-16 | Yes |
| 203-320 | DARIEN | 7230 | 2003-04-16 | Yes |
| 203-369 | OLDGRNWICH | 7230 | 2003-10-07 | Yes |
| 203-388 | STAMFORD | 7230 | — | Yes |
| 203-391 | STAMFORD | 7230 | — | Yes |
| 203-399 | STAMFORD | 7230 | — | Yes |
| 203-428 | STAMFORD | 7230 | — | Yes |
| 203-429 | WESTPORT | 7230 | — | Yes |
| 203-448 | DANBURY | 7230 | — | Yes |
| 203-455 | BRIDGEPORT | 7230 | — | Yes |
| 203-480 | FAIRFIELD | 7230 | — | Yes |
| 203-566 | STAMFORD | 7230 | 2003-02-04 | Yes |
| 203-607 | STAMFORD | 7230 | 2003-02-04 | Yes |
| 203-620 | DARIEN | 7230 | 2004-07-19 | Yes |
| 203-636 | DARIEN | 7230 | 2004-09-14 | Yes |
| 203-642 | NORWALK | 7230 | — | Yes |
| 203-705 | STAMFORD | 7230 | — | Yes |
| 203-719 | STAMFORD | 7230 | — | — |
| 203-742 | GREENWICH | 7230 | 2003-04-10 | Yes |
| 203-818 | NORWALK | 7230 | — | Yes |
| 203-827 | OLDGRNWICH | 7230 | 2004-07-19 | Yes |
| 203-844 | FAIRFIELD | 7230 | 2004-08-16 | Yes |
| 203-897 | STAMFORD | 7230 | 2008-08-20 | Yes |
| 203-898 | DARIEN | 7230 | 2005-01-31 | Yes |
| 203-920 | NEW CANAAN | 7230 | 2004-02-20 | Yes |
| 203-923 | BRIDGEPORT | 7230 | — | Yes |
| 203-955 | FAIRFIELD | 7230 | 2004-02-20 | Yes |
| 203-986 | OLDGRNWICH | 7230 | 2004-02-20 | Yes |
| 203-990 | OLDGRNWICH | 7230 | 2005-01-31 | Yes |
| 203-995 | BRIDGEPORT | 7230 | 2008-10-08 | 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.