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npa-nxx	State/Province	Company	FRN	RMD	OCN	Rate Center	CLLI	Assign Date	Misc
203-559	CT	TELEPORT COMMUNICATIONS AMERICA, LLC - CT (AT&T)	0004274114	RMD0003897	7143	DARIEN	HRFRCTCRDS0	00/00/0000	Prefix Type: CLEC Switch Name: CONNECTICUT Switch Type: Northern Telecom DMS100 (Digital) Host LATA: Connecticut (920) Tandem: N/A 🔧 Explore Switch(CLLI: HRFRCTCRDS0))
203-559 is split into 1,000-number blocks - detail below
203-559-0XXX	CT	METROPCS, INC. (T-Mobile US, Inc)		N/A	5562	DARIEN	BLFDCTAP2MD	01/09/2004	Prefix Type: PCS Switch Name: BLOOMFIELD Switch Type: N/A LATA: Connecticut (920) Tandem: N/A 🔧 Explore Switch(CLLI: BLFDCTAP2MD))
203-559-1XXX	CT	METROPCS, INC. (T-Mobile US, Inc)		N/A	5562	DARIEN	BLFDCTAP2MD	01/09/2004	Prefix Type: PCS Switch Name: BLOOMFIELD Switch Type: N/A LATA: Connecticut (920) Tandem: N/A 🔧 Explore Switch(CLLI: BLFDCTAP2MD))
203-559-2XXX	CT	METROPCS, INC. (T-Mobile US, Inc)		N/A	5562	DARIEN	BLFDCTAP2MD	03/30/2007	Prefix Type: PCS Switch Name: BLOOMFIELD Switch Type: N/A LATA: Connecticut (920) Tandem: N/A 🔧 Explore Switch(CLLI: BLFDCTAP2MD))
203-559-3XXX	CT	TELEPORT COMMUNICATIONS AMERICA, LLC - CT (AT&T)	0004274114	RMD0003897	7143	DARIEN	HRFRCTCRDS0	N/A	Prefix Type: CLEC Switch Name: CONNECTICUT Switch Type: Northern Telecom DMS100 (Digital) Host LATA: Connecticut (920) Tandem: N/A 🔧 Explore Switch(CLLI: HRFRCTCRDS0))
203-559-4XXX	CT	METROPCS, INC. (T-Mobile US, Inc)		N/A	5562	DARIEN	BLFDCTAP2MD	08/25/2003	Prefix Type: PCS Switch Name: BLOOMFIELD Switch Type: N/A LATA: Connecticut (920) Tandem: N/A 🔧 Explore Switch(CLLI: BLFDCTAP2MD))
203-559-5XXX	CT	METROPCS, INC. (T-Mobile US, Inc)		N/A	5562	DARIEN	BLFDCTAP2MD	08/25/2003	Prefix Type: PCS Switch Name: BLOOMFIELD Switch Type: N/A LATA: Connecticut (920) Tandem: N/A 🔧 Explore Switch(CLLI: BLFDCTAP2MD))
203-559-6XXX	CT	METROPCS, INC. (T-Mobile US, Inc)		N/A	5562	DARIEN	BLFDCTAP2MD	05/02/2003	Prefix Type: PCS Switch Name: BLOOMFIELD Switch Type: N/A LATA: Connecticut (920) Tandem: N/A 🔧 Explore Switch(CLLI: BLFDCTAP2MD))
203-559-7XXX	CT	METROPCS, INC. (T-Mobile US, Inc)		N/A	5562	DARIEN	BLFDCTAP2MD	05/02/2003	Prefix Type: PCS Switch Name: BLOOMFIELD Switch Type: N/A LATA: Connecticut (920) Tandem: N/A 🔧 Explore Switch(CLLI: BLFDCTAP2MD))
203-559-8XXX	CT	METROPCS, INC. (T-Mobile US, Inc)		N/A	5562	DARIEN	BLFDCTAP2MD	11/25/2002	Prefix Type: PCS Switch Name: BLOOMFIELD Switch Type: N/A LATA: Connecticut (920) Tandem: N/A 🔧 Explore Switch(CLLI: BLFDCTAP2MD))
203-559-9XXX	CT	METROPCS, INC. (T-Mobile US, Inc)		N/A	5562	DARIEN	BLFDCTAP2MD	11/25/2002	Prefix Type: PCS Switch Name: BLOOMFIELD Switch Type: N/A LATA: Connecticut (920) Tandem: N/A 🔧 Explore Switch(CLLI: BLFDCTAP2MD))