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| Raw Number | 203571 |
| Basic Format | 203-571 |
| NPA (Area Code) | 203 |
| NXX | 571 |
| NPA-NXX-X | OCN | Company | Rate Center | Use Type | Assign Date | City | State | Region | Block Effective Date |
|---|---|---|---|---|---|---|---|---|---|
| 203-571-0XXX | 145J | TERRA NOVA TELECOM INC. | WESTPORT | AS | 09/22/2025 | WESTPORT | CT | NE | 10/16/2025 |
| 203-571-1XXX | 829J | PAETEC ITEL, LLC | WESTPORT | AS | 04/27/2001 | WESTPORT | CT | NE | 05/17/2001 |
| 203-571-2XXX | 4036 | NEW CINGULAR WIRELESS PCS, LLC - DC | WESTPORT | AS | 01/07/2016 | WESTPORT | CT | NE | 01/19/2016 |
| 203-571-3XXX | 199F | BANDWIDTH.COM CLEC, LLC - CT | WESTPORT | AS | 04/02/2014 | WESTPORT | CT | NE | 05/02/2014 |
| 203-571-4XXX | 199F | BANDWIDTH.COM CLEC, LLC - CT | WESTPORT | AS | 04/02/2014 | WESTPORT | CT | NE | 05/02/2014 |
| 203-571-5XXX | 7421 | AT&T - LOCAL | WESTPORT | RT | WESTPORT | CT | NE | ||
| 203-571-6XXX | 829J | PAETEC ITEL, LLC | WESTPORT | AS | 04/28/2006 | WESTPORT | CT | NE | 05/25/2006 |
| 203-571-7XXX | 6624 | OMNIPOINT COMMUNICATIONS, INC. - CT | WESTPORT | AS | 11/03/2005 | WESTPORT | CT | NE | 11/28/2005 |
| 203-571-8XXX | 5562 | METROPCS, INC. | WESTPORT | AS | 11/21/2002 | WESTPORT | CT | NE | 12/11/2002 |
| 203-571-9XXX | 4036 | NEW CINGULAR WIRELESS PCS, LLC - DC | WESTPORT | AS | 01/07/2016 | WESTPORT | CT | NE | 01/19/2016 |
| 203-571-XXXX | 7421 | AT&T - LOCAL | WESTPORT | AS | WESTPORT | CT |
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