Local calling guide: NPA-NXX search

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NPA: 443 [Rate centres in NPA 443] [Dial plan for NPA 443]

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NPA-NXX	BLOCK	Rate Centre	Region	Switch	OCN	LATA	Eff date
443-231	6	Essex	MD		318J COMCAST IP PHONE, LLC	238	2006-06-20
443-231	7	Essex	MD		318J COMCAST IP PHONE, LLC	238	2006-06-20
443-231	8	Essex	MD		6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC	238	2006-08-25
443-231	9	Essex	MD		515J IP HORIZON LLC	238	2016-05-31
443-232	A	Willards	MD	SLBRMD90DS0	2593 CORE COMMUNICATIONS, INC.- MD	242
443-232	0	Willards	MD		876D ONVOY, LLC - MD	242	2020-04-30
443-232	1	Willards	MD		876D ONVOY, LLC - MD	242	2020-07-04
443-232	2	Willards	MD		876D ONVOY, LLC - MD	242	2020-07-04
443-232	3	Willards	MD		2593 CORE COMMUNICATIONS, INC.- MD	242	2018-06-17
443-232	4	Willards	MD		2593 CORE COMMUNICATIONS, INC.- MD	242	2018-06-17
443-232	5	Willards	MD		2593 CORE COMMUNICATIONS, INC.- MD	242	2018-06-17
443-232	6	Willards	MD		2593 CORE COMMUNICATIONS, INC.- MD	242	2019-06-07
443-232	7	Willards	MD		318J COMCAST IP PHONE, LLC	242	2007-08-08
443-232	8	Willards	MD		073H TELNYX LLC	242	2017-09-13
443-232	9	Willards	MD		876D ONVOY, LLC - MD	242	2020-04-30
443-233	A	Vienna	MD		829J PAETEC ITEL, LLC	242	2025-04-01
443-233	0	Vienna	MD		876D ONVOY, LLC - MD	242	2020-08-09
443-233	1	Vienna	MD		876D ONVOY, LLC - MD	242	2020-08-09
443-233	2	Vienna	MD		318J COMCAST IP PHONE, LLC	242	2007-08-08
443-233	3	Vienna	MD		2593 CORE COMMUNICATIONS, INC.- MD	242	2018-06-17
443-233	4	Vienna	MD		145J TERRA NOVA TELECOM INC.	242	2022-04-23
443-233	5	Vienna	MD		876D ONVOY, LLC - MD	242	2020-10-17
443-233	6	Vienna	MD		6119 LEVEL 3 COMMUNICATIONS, LLC - MD	242	2012-05-26
443-233	7	Vienna	MD		2593 CORE COMMUNICATIONS, INC.- MD	242	2018-06-17
443-233	8	Vienna	MD		073H TELNYX LLC	242	2017-09-13
443-233	9	Vienna	MD		829J PAETEC ITEL, LLC	242
443-234	A	Snow Hill	MD		829J PAETEC ITEL, LLC	242	2025-04-01
443-234	0	Snow Hill	MD		876D ONVOY, LLC - MD	242	2019-03-04
443-234	1	Snow Hill	MD		876D ONVOY, LLC - MD	242	2021-03-05
443-234	2	Snow Hill	MD		829J PAETEC ITEL, LLC	242
443-234	3	Snow Hill	MD		7228 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD	242	2016-05-06
443-234	4	Snow Hill	MD		145J TERRA NOVA TELECOM INC.	242	2024-02-15
443-234	5	Snow Hill	MD		318J COMCAST IP PHONE, LLC	242	2006-07-31
443-234	6	Snow Hill	MD		2593 CORE COMMUNICATIONS, INC.- MD	242	2018-06-17
443-234	7	Snow Hill	MD		2593 CORE COMMUNICATIONS, INC.- MD	242	2018-06-17
443-234	8	Snow Hill	MD		876D ONVOY, LLC - MD	242	2017-04-14
443-234	9	Snow Hill	MD		876D ONVOY, LLC - MD	242	2019-03-04
443-235	A	Salisbury	MD	ESTNMDESQMD	6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD	242
443-236	A	Cardiff	MD	BLTMMD91GT0	2593 CORE COMMUNICATIONS, INC.- MD	238
443-237	A	North Beach	MD	BLTMMD91GT0	2593 CORE COMMUNICATIONS, INC.- MD	238
443-238	A	Parkton	MD		829J PAETEC ITEL, LLC	238	2025-04-01
443-238	0	Parkton	MD		876D ONVOY, LLC - MD	238	2024-03-07
443-238	1	Parkton	MD		876D ONVOY, LLC - MD	238	2016-03-21
443-238	2	Parkton	MD		829J PAETEC ITEL, LLC	238
443-238	3	Parkton	MD		876D ONVOY, LLC - MD	238	2016-03-21
443-238	4	Parkton	MD		145J TERRA NOVA TELECOM INC.	238	2024-02-15
443-238	5	Parkton	MD		318J COMCAST IP PHONE, LLC	238	2015-09-21
443-238	6	Parkton	MD		2593 CORE COMMUNICATIONS, INC.- MD	238	2018-06-16
443-238	7	Parkton	MD		508J CENTURYLINK COMMUNICATIONS, LLC	238	2014-06-12
443-238	8	Parkton	MD		073H TELNYX LLC	238	2017-04-26

Last updated: Thu, 29 Jan 2026 14:35:03 UTC

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