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npa-nxx	State/Province	Company	FRN	RMD	OCN	Rate Center	CLLI	Assign Date	Misc
406-872	MT	WESTERN MONTANA COMMUNITYTEL INC. - MT (COMMUNITYTEL INC)	0001643006	RMD0002532	986F	POLSON	PLSNMTPC1MD	10/15/2007	Prefix Type: UNKNOWN Switch Name: N/A Switch Type: N/A LATA: Great Falls MT (648) Tandem: N/A 🔧 Explore Switch(CLLI: PLSNMTPC1MD)) 🕘 Prefix History 🔎 Explore Carrier Information
406-872 is split into 1,000-number blocks - detail below
406-872-0XXX	MT	ONVOY, LLC - MT (Sinch)	0004323028	RMD0001966	453F	POLSON	NOCLLIKNOWN	11/16/2012	Prefix Type: CLEC Switch Name: N/A Switch Type: N/A LATA: Great Falls MT (648) Tandem: N/A 🔧 Explore Switch(CLLI: NOCLLIKNOWN)) 🕘 Prefix History 🔎 Explore Carrier Information
406-872-1XXX	MT	ONVOY, LLC - MT (Sinch)	0004323028	RMD0001966	453F	POLSON	NOCLLIKNOWN	11/16/2012	Prefix Type: CLEC Switch Name: N/A Switch Type: N/A LATA: Great Falls MT (648) Tandem: N/A 🔧 Explore Switch(CLLI: NOCLLIKNOWN)) 🕘 Prefix History 🔎 Explore Carrier Information
406-872-2XXX	MT	WESTERN MONTANA COMMUNITYTEL INC. - MT (COMMUNITYTEL INC)	0001643006	RMD0002532	986F	POLSON	PLSNMTPC1MD	10/18/2007	Prefix Type: UNKNOWN Switch Name: N/A Switch Type: N/A LATA: Great Falls MT (648) Tandem: N/A 🔧 Explore Switch(CLLI: PLSNMTPC1MD)) 🕘 Prefix History 🔎 Explore Carrier Information
406-872-3XXX	MT	ONVOY, LLC - MT (Sinch)	0004323028	RMD0001966	453F	POLSON	NOCLLIKNOWN	11/16/2012	Prefix Type: CLEC Switch Name: N/A Switch Type: N/A LATA: Great Falls MT (648) Tandem: N/A 🔧 Explore Switch(CLLI: NOCLLIKNOWN)) 🕘 Prefix History 🔎 Explore Carrier Information
406-872-4XXX	MT	ONVOY, LLC - MT (Sinch)	0004323028	RMD0001966	453F	POLSON	NOCLLIKNOWN	11/16/2012	Prefix Type: CLEC Switch Name: N/A Switch Type: N/A LATA: Great Falls MT (648) Tandem: N/A 🔧 Explore Switch(CLLI: NOCLLIKNOWN)) 🕘 Prefix History 🔎 Explore Carrier Information
406-872-5XXX	MT	T-MOBILE USA, INC. (T-Mobile US, Inc)	0017078262	RMD0019051	6529	POLSON	NOCLLIKNOWN	01/24/2025	Prefix Type: PCS Switch Name: N/A Switch Type: N/A LATA: Great Falls MT (648) Tandem: N/A 🔧 Explore Switch(CLLI: NOCLLIKNOWN)) 🕘 Prefix History 🔎 Explore Carrier Information
406-872-6XXX	MT	CENTURYLINK COMMUNICATIONS, LLC (Lumen Technologies, Inc)	0031422439	RMD0006976	508J	POLSON	HLNAMTMAUMD	04/30/2014	Prefix Type: IPES Switch Name: DILLON Switch Type: N/A LATA: Great Falls MT (648) Tandem: N/A 🔧 Explore Switch(CLLI: HLNAMTMAUMD)) 🕘 Prefix History 🔎 Explore Carrier Information
406-872-7XXX	MT	ONVOY, LLC - MT (Sinch)	0004323028	RMD0001966	453F	POLSON	NOCLLIKNOWN	02/04/2011	Prefix Type: CLEC Switch Name: N/A Switch Type: N/A LATA: Great Falls MT (648) Tandem: N/A 🔧 Explore Switch(CLLI: NOCLLIKNOWN)) 🕘 Prefix History 🔎 Explore Carrier Information