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npa-nxx	State/Province	Company	FRN	RMD	OCN	Rate Center	CLLI	Assign Date	Misc
406-677	MT	BLACKFOOT TEL. COOP., INC.	0001646165	RMD0004776	2235	SEELEYLAKE	CLTNMTXCRS1	00/00/0000	Prefix Type: ICO Switch Name: CLINTON Switch Type: Northern Telecom DMS10 RSLE LATA: Great Falls MT (648) Tandem: N/A 🔧 Explore Switch(CLLI: CLTNMTXCRS1))
406-677 is split into 1,000-number blocks - detail below
406-677-0XXX	MT	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT (Verizon Wireless)	0001627702	RMD0003346	6564	SEELEYLAKE	HLNAMTMAX1X	05/08/2024	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Great Falls MT (648) Tandem: N/A 🔧 Explore Switch(CLLI: HLNAMTMAX1X))
406-677-1XXX	MT	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT (Verizon Wireless)	0001627702	RMD0003346	6564	SEELEYLAKE	HLNAMTMAX1X	10/03/2024	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Great Falls MT (648) Tandem: N/A 🔧 Explore Switch(CLLI: HLNAMTMAX1X))
406-677-2XXX	MT	BLACKFOOT TEL. COOP., INC.	0001646165	RMD0004776	2235	SEELEYLAKE	CLTNMTXCRS1	N/A	Prefix Type: ICO Switch Name: CLINTON Switch Type: Northern Telecom DMS10 RSLE LATA: Great Falls MT (648) Tandem: N/A 🔧 Explore Switch(CLLI: CLTNMTXCRS1))
406-677-3XXX	MT	BLACKFOOT TEL. COOP., INC.	0001646165	RMD0004776	2235	SEELEYLAKE	CLTNMTXCRS1	N/A	Prefix Type: ICO Switch Name: CLINTON Switch Type: Northern Telecom DMS10 RSLE LATA: Great Falls MT (648) Tandem: N/A 🔧 Explore Switch(CLLI: CLTNMTXCRS1))
406-677-4XXX	MT	TERRA NOVA TELECOM INC.	0021193057	RMD0001495	145J	SEELEYLAKE	NOCLLIKNOWN	09/17/2025	Prefix Type: IPES Switch Name: N/A Switch Type: N/A LATA: Great Falls MT (648) Tandem: N/A 🔧 Explore Switch(CLLI: NOCLLIKNOWN))
406-677-5XXX	MT	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT (Verizon Wireless)	0001627702	RMD0003346	6564	SEELEYLAKE	HLNAMTMAX1X	01/07/2026	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Great Falls MT (648) Tandem: N/A 🔧 Explore Switch(CLLI: HLNAMTMAX1X))
406-677-6XXX	MT	NEW CINGULAR WIRELESS PCS, LLC (AT&T Wireless)	0003291192	RMD0036909	6010	SEELEYLAKE	MSSLMTAG5MD	04/22/2026	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Great Falls MT (648) Tandem: N/A 🔧 Explore Switch(CLLI: MSSLMTAG5MD))
406-677-7XXX	MT	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT (Verizon Wireless)	0001627702	RMD0003346	6564	SEELEYLAKE	HLNAMTMAX1X	04/22/2025	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Great Falls MT (648) Tandem: N/A 🔧 Explore Switch(CLLI: HLNAMTMAX1X))
406-677-8XXX	MT	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT (Verizon Wireless)	0001627702	RMD0003346	6564	SEELEYLAKE	HLNAMTMAX1X	02/03/2025	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Great Falls MT (648) Tandem: N/A 🔧 Explore Switch(CLLI: HLNAMTMAX1X))
406-677-9XXX	MT	BLACKFOOT TEL. COOP., INC.	0001646165	RMD0004776	2235	SEELEYLAKE	CLTNMTXCRS1	N/A	Prefix Type: ICO Switch Name: CLINTON Switch Type: Northern Telecom DMS10 RSLE LATA: Great Falls MT (648) Tandem: N/A 🔧 Explore Switch(CLLI: CLTNMTXCRS1))