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| Raw Number | 517921 |
| Basic Format | 517-921 |
| NPA (Area Code) | 517 |
| NXX | 921 |
| NPA-NXX-X | OCN | Company | Rate Center | Use Type | Assign Date | City | State | Region | Block Effective Date |
|---|---|---|---|---|---|---|---|---|---|
| 517-921-0XXX | 543C | ONVOY, LLCV - MI | ADDISON | AS | 01/15/2020 | ADDISON | MI | MW | 02/10/2020 |
| 517-921-1XXX | 543C | ONVOY, LLCV - MI | ADDISON | AS | 01/15/2020 | ADDISON | MI | MW | 02/10/2020 |
| 517-921-2XXX | 3535 | ACD TELECOM, INC. - MI | ADDISON | RT | ADDISON | MI | MW | ||
| 517-921-3XXX | 3535 | ACD TELECOM, INC. - MI | ADDISON | RT | ADDISON | MI | MW | ||
| 517-921-4XXX | 3535 | ACD TELECOM, INC. - MI | ADDISON | RT | ADDISON | MI | MW | ||
| 517-921-5XXX | 6120 | LEVEL 3 COMMUNICATIONS, LLC - MI | ADDISON | AS | 04/24/2018 | ADDISON | MI | MW | 05/18/2018 |
| 517-921-6XXX | 508J | CENTURYLINK COMMUNICATIONS, LLC | ADDISON | AS | 12/03/2015 | ADDISON | MI | MW | 01/25/2016 |
| 517-921-7XXX | 3535 | ACD TELECOM, INC. - MI | ADDISON | RT | ADDISON | MI | MW | ||
| 517-921-8XXX | 6534 | NEW CINGULAR WIRELESS PCS, LLC - IL | ADDISON | AS | 08/27/2009 | ADDISON | MI | MW | 09/26/2009 |
| 517-921-9XXX | 3535 | ACD TELECOM, INC. - MI | ADDISON | RT | ADDISON | MI | MW | ||
| 517-921-XXXX | 3535 | ACD TELECOM, INC. - MI | ADDISON | AS | 10/30/2001 | ADDISON | MI |
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