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| npa-nxx | State | Company | FRN | RMD | OCN | Rate Center | CLLI | Assign Date | Misc |
| 406-669 | MT | TRIANGLE TEL. COOP. ASSN., INC. | 0003729316 | RMD0002701 | 2257 | MOLT | BGTMMTXCDS0 | 00/00/0000 | Prefix Type: ICO Switch Name: BIG TIMBER Switch Type: Northern Telecom DMS10 (Digital) LATA: Billings MT (650) Tandem: N/A Detailed Switch Info |
| 406-940 | MT | NEW CINGULAR WIRELESS PCS, LLC (AT&T Wireless) | 0003291192 | RMD0036909 | 6010 | MOLT | BLNGMTMAMMD | 07/18/2017 | Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Billings MT (650) Tandem: N/A Detailed Switch Info |
| Thousands block for 406-940 | |||||||||
| 406-940-0 | MT | TERRA NOVA TELECOM INC. | 0021193057 | RMD0001495 | 145J | MOLT | NOCLLIKNOWN | 08/05/2025 | Prefix Type: IPES Switch Name: N/A Switch Type: N/A LATA: Billings MT (650) Tandem: N/A Detailed Switch Info |
| 406-940-5 | MT | NEW CINGULAR WIRELESS PCS, LLC (AT&T Wireless) | 0003291192 | RMD0036909 | 6010 | MOLT | BLNGMTMAMMD | 07/25/2017 | Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Billings MT (650) Tandem: N/A Detailed Switch Info |
| 406-940-9 | MT | NEW CINGULAR WIRELESS PCS, LLC (AT&T Wireless) | 0003291192 | RMD0036909 | 6010 | MOLT | BLNGMTMAMMD | 11/24/2024 | Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Billings MT (650) Tandem: N/A Detailed Switch Info |