Input an Area Code (required) followed by the Prefix, or Exchange (optional):
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npa-nxxStateCompanyOCNRate CenterCLLIAssign DateMisc
956-577TXSOUTHWESTERN BELL9533HARLINGENHRLNTXHGDS002/05/2002Prefix Type: RBOC
Switch Name: Harlingen
Switch Type: Northern Telecom DMS100 (Digital) Host
LATA: Brownsville TX (568)
Tandem: HRLNTXHG03T
Detailed Switch Info
Thousands block for 956-577
956-577-0TXSOUTHWESTERN BELL9533HARLINGENHRLNTXHGDS003/08/2016Prefix Type: RBOC
Switch Name: Harlingen
Switch Type: Northern Telecom DMS100 (Digital) Host
LATA: Brownsville TX (568)
Tandem: HRLNTXHG03T
Detailed Switch Info
956-577-1TXNEW CINGULAR WIRELESS PCS, LLC - IL (AT&T Wireless)6534HARLINGENHRLNTXHGX7X04/22/2008Prefix Type: WIRELESS
Switch Name: N/A
Switch Type: N/A
LATA: Brownsville TX (568)
Tandem: N/A
Detailed Switch Info
956-577-2TXNEW CINGULAR WIRELESS PCS, LLC - IL (AT&T Wireless)6534HARLINGENHRLNTXHGX7X04/22/2008Prefix Type: WIRELESS
Switch Name: N/A
Switch Type: N/A
LATA: Brownsville TX (568)
Tandem: N/A
Detailed Switch Info
956-577-3TXNEW CINGULAR WIRELESS PCS, LLC - IL (AT&T Wireless)6534HARLINGENHRLNTXHGX7X04/22/2008Prefix Type: WIRELESS
Switch Name: N/A
Switch Type: N/A
LATA: Brownsville TX (568)
Tandem: N/A
Detailed Switch Info
956-577-4TXNEW CINGULAR WIRELESS PCS, LLC - IL (AT&T Wireless)6534HARLINGENHRLNTXHGX7X04/22/2008Prefix Type: WIRELESS
Switch Name: N/A
Switch Type: N/A
LATA: Brownsville TX (568)
Tandem: N/A
Detailed Switch Info
956-577-5TXNEW CINGULAR WIRELESS PCS, LLC - IL (AT&T Wireless)6534HARLINGENHRLNTXHGX7X04/22/2008Prefix Type: WIRELESS
Switch Name: N/A
Switch Type: N/A
LATA: Brownsville TX (568)
Tandem: N/A
Detailed Switch Info
956-577-6TXNEW CINGULAR WIRELESS PCS, LLC - IL (AT&T Wireless)6534HARLINGENHRLNTXHGX7X04/22/2008Prefix Type: WIRELESS
Switch Name: N/A
Switch Type: N/A
LATA: Brownsville TX (568)
Tandem: N/A
Detailed Switch Info
956-577-7TXNEW CINGULAR WIRELESS PCS, LLC - IL (AT&T Wireless)6534HARLINGENHRLNTXHGX7X12/27/2006Prefix Type: WIRELESS
Switch Name: N/A
Switch Type: N/A
LATA: Brownsville TX (568)
Tandem: N/A
Detailed Switch Info
956-577-8TXTERRA NOVA TELECOM INC.145JHARLINGENHRLNTXDU7MD04/10/2024Prefix Type: IPES
Switch Name: N/A
Switch Type: N/A
LATA: Brownsville TX (568)
Tandem: N/A
Detailed Switch Info
956-577-9TXTERRA NOVA TELECOM INC.145JHARLINGENHRLNTXDU7MD12/19/2022Prefix Type: IPES
Switch Name: N/A
Switch Type: N/A
LATA: Brownsville TX (568)
Tandem: N/A
Detailed Switch Info
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