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npa-nxx	State/Province	Company	FRN	RMD	OCN	Rate Center	CLLI	Assign Date	Misc
256-604	AL	NEW CINGULAR WIRELESS PCS, LLC - GA (AT&T Wireless)	0003291192	RMD0036909	6214	HUNTSVILLE	HNVIALODAMD	00/00/0000	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Huntsville AL (477) Tandem: N/A 🔧 Explore Switch(CLLI: HNVIALODAMD))
256-604 is split into 1,000-number blocks - detail below
256-604-0XXX	AL	NEW CINGULAR WIRELESS PCS, LLC - GA (AT&T Wireless)	0003291192	RMD0036909	6214	HUNTSVILLE	HNVIALODAMD	N/A	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Huntsville AL (477) Tandem: N/A 🔧 Explore Switch(CLLI: HNVIALODAMD))
256-604-1XXX	AL	METROPCS, INC. (T-Mobile US, Inc)		N/A	5562	HUNTSVILLE	HNVIAL03X9Y	07/13/2007	Prefix Type: PCS Switch Name: N/A Switch Type: N/A LATA: Huntsville AL (477) Tandem: N/A 🔧 Explore Switch(CLLI: HNVIAL03X9Y))
256-604-2XXX	AL	METROPCS, INC. (T-Mobile US, Inc)		N/A	5562	HUNTSVILLE	HNVIAL03X9Y	07/13/2007	Prefix Type: PCS Switch Name: N/A Switch Type: N/A LATA: Huntsville AL (477) Tandem: N/A 🔧 Explore Switch(CLLI: HNVIAL03X9Y))
256-604-3XXX	AL	NEW CINGULAR WIRELESS PCS, LLC - GA (AT&T Wireless)	0003291192	RMD0036909	6214	HUNTSVILLE	HNVIALODAMD	04/08/2010	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Huntsville AL (477) Tandem: N/A 🔧 Explore Switch(CLLI: HNVIALODAMD))
256-604-4XXX	AL	METROPCS, INC. (T-Mobile US, Inc)		N/A	5562	HUNTSVILLE	HNVIAL03X9Y	05/16/2007	Prefix Type: PCS Switch Name: N/A Switch Type: N/A LATA: Huntsville AL (477) Tandem: N/A 🔧 Explore Switch(CLLI: HNVIAL03X9Y))
256-604-5XXX	AL	PAETEC ITEL, LLC	0015247810	RMD0038378	829J	HUNTSVILLE	HNVIALUNXTZ	02/23/2005	Prefix Type: IPES Switch Name: N/A Switch Type: N/A LATA: Huntsville AL (477) Tandem: N/A 🔧 Explore Switch(CLLI: HNVIALUNXTZ))
256-604-6XXX	AL	METROPCS, INC. (T-Mobile US, Inc)		N/A	5562	HUNTSVILLE	HNVIAL03X9Y	12/19/2006	Prefix Type: PCS Switch Name: N/A Switch Type: N/A LATA: Huntsville AL (477) Tandem: N/A 🔧 Explore Switch(CLLI: HNVIAL03X9Y))
256-604-7XXX	AL	METROPCS, INC. (T-Mobile US, Inc)		N/A	5562	HUNTSVILLE	HNVIAL03X9Y	12/19/2006	Prefix Type: PCS Switch Name: N/A Switch Type: N/A LATA: Huntsville AL (477) Tandem: N/A 🔧 Explore Switch(CLLI: HNVIAL03X9Y))
256-604-8XXX	AL	NEW CINGULAR WIRELESS PCS, LLC - GA (AT&T Wireless)	0003291192	RMD0036909	6214	HUNTSVILLE	HNVIALODAMD	N/A	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Huntsville AL (477) Tandem: N/A 🔧 Explore Switch(CLLI: HNVIALODAMD))
256-604-9XXX	AL	NEW CINGULAR WIRELESS PCS, LLC - GA (AT&T Wireless)	0003291192	RMD0036909	6214	HUNTSVILLE	HNVIALODAMD	N/A	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Huntsville AL (477) Tandem: N/A 🔧 Explore Switch(CLLI: HNVIALODAMD))