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npa-nxx	State/Province	Company	FRN	RMD	OCN	Rate Center	CLLI	Assign Date	Misc
435-553	UT	LEVEL 3 COMMUNICATIONS, LLC - UT (Lumen Technologies, Inc)	0015338122	RMD0006112	3231	BRIGHAM CY	SLKDUTYI3MD	04/24/2002	Prefix Type: CLEC Switch Name: N/A Switch Type: N/A LATA: Utah (660) Tandem: N/A 🔧 Explore Switch(CLLI: SLKDUTYI3MD))
435-553 is split into 1,000-number blocks - detail below
435-553-0XXX	UT	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT (Verizon Wireless)	0003290673	RMD0003382	6571	BRIGHAM CY	SLKDUTBTAMD	08/28/2017	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Utah (660) Tandem: N/A 🔧 Explore Switch(CLLI: SLKDUTBTAMD))
435-553-1XXX	UT	T-MOBILE USA, INC. (T-Mobile US, Inc)	0017078262	RMD0019051	6529	BRIGHAM CY	SLKDUTFJCM5	01/12/2011	Prefix Type: PCS Switch Name: SALT LAKE CITY Switch Type: N/A LATA: Utah (660) Tandem: N/A 🔧 Explore Switch(CLLI: SLKDUTFJCM5))
435-553-2XXX	UT	T-MOBILE USA, INC. (T-Mobile US, Inc)	0017078262	RMD0019051	6529	BRIGHAM CY	SLKDUTFJCM5	01/12/2011	Prefix Type: PCS Switch Name: SALT LAKE CITY Switch Type: N/A LATA: Utah (660) Tandem: N/A 🔧 Explore Switch(CLLI: SLKDUTFJCM5))
435-553-3XXX	UT	T-MOBILE USA, INC. (T-Mobile US, Inc)	0017078262	RMD0019051	6529	BRIGHAM CY	SLKDUTFJCM5	01/12/2011	Prefix Type: PCS Switch Name: SALT LAKE CITY Switch Type: N/A LATA: Utah (660) Tandem: N/A 🔧 Explore Switch(CLLI: SLKDUTFJCM5))
435-553-4XXX	UT	LEVEL 3 COMMUNICATIONS, LLC - UT (Lumen Technologies, Inc)	0015338122	RMD0006112	3231	BRIGHAM CY	SLKDUTYI3MD	N/A	Prefix Type: CLEC Switch Name: N/A Switch Type: N/A LATA: Utah (660) Tandem: N/A 🔧 Explore Switch(CLLI: SLKDUTYI3MD))
435-553-5XXX	UT	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT (Verizon Wireless)	0003290673	RMD0003382	6571	BRIGHAM CY	SLKDUTBTAMD	06/18/2007	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Utah (660) Tandem: N/A 🔧 Explore Switch(CLLI: SLKDUTBTAMD))
435-553-6XXX	UT	T-MOBILE USA, INC. (T-Mobile US, Inc)	0017078262	RMD0019051	6529	BRIGHAM CY	SLKDUTFJCM5	01/12/2011	Prefix Type: PCS Switch Name: SALT LAKE CITY Switch Type: N/A LATA: Utah (660) Tandem: N/A 🔧 Explore Switch(CLLI: SLKDUTFJCM5))
435-553-7XXX	UT	T-MOBILE USA, INC. (T-Mobile US, Inc)	0017078262	RMD0019051	6529	BRIGHAM CY	SLKDUTFJCM5	01/12/2011	Prefix Type: PCS Switch Name: SALT LAKE CITY Switch Type: N/A LATA: Utah (660) Tandem: N/A 🔧 Explore Switch(CLLI: SLKDUTFJCM5))
435-553-8XXX	UT	T-MOBILE USA, INC. (T-Mobile US, Inc)	0017078262	RMD0019051	6529	BRIGHAM CY	SLKDUTFJCM5	01/12/2011	Prefix Type: PCS Switch Name: SALT LAKE CITY Switch Type: N/A LATA: Utah (660) Tandem: N/A 🔧 Explore Switch(CLLI: SLKDUTFJCM5))
435-553-9XXX	UT	T-MOBILE USA, INC. (T-Mobile US, Inc)	0017078262	RMD0019051	6529	BRIGHAM CY	SLKDUTFJCM5	01/31/2007	Prefix Type: PCS Switch Name: SALT LAKE CITY Switch Type: N/A LATA: Utah (660) Tandem: N/A 🔧 Explore Switch(CLLI: SLKDUTFJCM5))