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| npa-nxx | State | Company | OCN | Rate Center | CLLI | Assign Date | Misc |
| 508-242 | MA | VERIZON NEW ENGLAND INC. (Verizon Communications) | 9102 | MEDFIELD | MEFDMAPLDS0 | 00/00/0000 | Prefix Type: RBOC Switch Name: N/A Switch Type: Northern Telecom DMS100 (Digital) Host LATA: N/A Tandem: N/A Detailed Switch Info |
| 508-359 | MA | VERIZON NEW ENGLAND INC. (Verizon Communications) | 9102 | MEDFIELD | MEFDMAPLDS0 | 00/00/0000 | Prefix Type: RBOC Switch Name: N/A Switch Type: Northern Telecom DMS100 (Digital) Host LATA: N/A Tandem: N/A Detailed Switch Info |
| 508-906 | MA | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MA (Verizon Communications) | 7199 | MEDFIELD | CMBRMAORDS0 | 00/00/0000 | Prefix Type: CLEC Switch Name: CAMBRIDGE Switch Type: Northern Telecom DMS100 (Digital) Host LATA: N/A Tandem: N/A Detailed Switch Info |
| 774-403 | MA | AIRUS, INC. - MA (Airus, Inc) | 428H | MEDFIELD | CMBSMA013MD | 10/07/2019 | Prefix Type: CLEC Switch Name: N/A Switch Type: N/A LATA: N/A Tandem: N/A Detailed Switch Info |
| 774-469 | MA | BANDWIDTH.COM CLEC, LLC - MA | 990E | MEDFIELD | BSTPMALLRMD | 09/13/2001 | Prefix Type: CLEC Switch Name: N/A Switch Type: N/A LATA: N/A Tandem: N/A Detailed Switch Info |
| 774-748 | MA | TON80 COMMUNICATIONS, LLC | 516J | MEDFIELD | SOVLMAABCMD | 02/01/2022 | Prefix Type: UNKNOWN Switch Name: N/A Switch Type: N/A LATA: N/A Tandem: N/A Detailed Switch Info |