Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
  • Effective date searches are available only for US area codes. Our sources for non-US NPA-NXX data do not provide this information.
  • If you want to search an entire area code regardless of activity, leave both the next and past days fields set to zero.

Baltimore, MD

<< 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 >>

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
410-637 0 BLTMMDCHDS2  9212 VERIZON MARYLAND, INC. 238      
410-637 1 BLTMMDCHDS2  9212 VERIZON MARYLAND, INC. 238      
410-637 2 BLTMMDCHDS2  9212 VERIZON MARYLAND, INC. 238      
410-637 3 BLTMMDCHDS2  9212 VERIZON MARYLAND, INC. 238      
410-637 4 BLTMMDCHDS2  9212 VERIZON MARYLAND, INC. 238      
410-637 5 BLTMMDCHDS2  9212 VERIZON MARYLAND, INC. 238      
410-637 6 BLTMMDCHDS2  9212 VERIZON MARYLAND, INC. 238      
410-637 7 BLTMMDCHDS2  9212 VERIZON MARYLAND, INC. 238      
410-637 8 BLTMMDCHDS2  9212 VERIZON MARYLAND, INC. 238      
410-637 9 BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238      
410-640 A HNVAMDAE3MD  6630 USA MOBILITY WIRELESS, INC. 238      
410-644 A ARBTMDARDS0  9212 VERIZON MARYLAND, INC. 238      
410-646 A ARBTMDARDS0  9212 VERIZON MARYLAND, INC. 238      
410-646 0 ARBTMDARDS0  9212 VERIZON MARYLAND, INC. 238      
410-646 1 ARBTMDARDS0  9212 VERIZON MARYLAND, INC. 238      
410-646 2 ARBTMDARDS0  9212 VERIZON MARYLAND, INC. 238      
410-646 3 ARBTMDARDS0  9212 VERIZON MARYLAND, INC. 238      
410-646 4 ARBTMDARDS0  9212 VERIZON MARYLAND, INC. 238      
410-646 5 ARBTMDARDS0  9212 VERIZON MARYLAND, INC. 238      
410-646 6 ARBTMDARDS0  9212 VERIZON MARYLAND, INC. 238      
410-646 7 ARBTMDARDS0  9212 VERIZON MARYLAND, INC. 238      
410-646 8 BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 238      
410-646 9   2593 CORE COMMUNICATIONS, INC.- MD 238      
410-649 A BLTMMDFMDS0  7325 TELEPORT COMMUNICATIONS AMERICA, LLC - MD 238      
410-649 0 BLTMMDFMDS0  7325 TELEPORT COMMUNICATIONS AMERICA, LLC - MD 238      
410-649 1 BLTMMDFMDS0  7325 TELEPORT COMMUNICATIONS AMERICA, LLC - MD 238      
410-649 2 BLTMMDFMDS0  7325 TELEPORT COMMUNICATIONS AMERICA, LLC - MD 238      
410-649 3 BLTMMDFMDS0  7325 TELEPORT COMMUNICATIONS AMERICA, LLC - MD 238      
410-649 4 BLTMMDFMDS0  7325 TELEPORT COMMUNICATIONS AMERICA, LLC - MD 238      
410-649 5 BLTMMDFMDS0  7325 TELEPORT COMMUNICATIONS AMERICA, LLC - MD 238      
410-649 6 BLTMMDFMDS0  7325 TELEPORT COMMUNICATIONS AMERICA, LLC - MD 238      
410-649 7 BLTMMDFMDS0  7325 TELEPORT COMMUNICATIONS AMERICA, LLC - MD 238      
410-649 8 BLTMMDFMDS0  7325 TELEPORT COMMUNICATIONS AMERICA, LLC - MD 238      
410-649 9 BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238      
410-659 A BLTMMDCHDS3  9212 VERIZON MARYLAND, INC. 238      
410-662 A BLTMMDUVDS0  9212 VERIZON MARYLAND, INC. 238      
410-662 0 BLTMMDUVDS0  9212 VERIZON MARYLAND, INC. 238      
410-662 1 BLTMMDUVDS0  9212 VERIZON MARYLAND, INC. 238      
410-662 2 CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238      
410-662 3 BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238      
410-662 4 BLTMMDUVDS0  9212 VERIZON MARYLAND, INC. 238      
410-662 5 BLTMMDUVDS0  9212 VERIZON MARYLAND, INC. 238      
410-662 6 BLTMMDUVDS0  9212 VERIZON MARYLAND, INC. 238      
410-662 7 BLTMMDUVDS0  9212 VERIZON MARYLAND, INC. 238      
410-662 8 BLTMMDUVDS0  9212 VERIZON MARYLAND, INC. 238      
410-662 9 BLTMMDUVDS0  9212 VERIZON MARYLAND, INC. 238      
410-664 A BLTMMDLBDS0  9212 VERIZON MARYLAND, INC. 238      
410-669 A BLTMMDMDDS0  9212 VERIZON MARYLAND, INC. 238      
410-675 A BLTMMDWLDS0  9212 VERIZON MARYLAND, INC. 238      
410-685 A BLTMMDCHDS2  9212 VERIZON MARYLAND, INC. 238      
410-706 A BLTMMDCHDS2  9212 VERIZON MARYLAND, INC. 238      
410-710 A BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238      
410-710 0 BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238      
410-710 1 BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238      
410-710 2 BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238      
410-710 3 BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238      
410-710 4 BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238      
410-710 5 BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238      
410-710 6 CLMAMDJTAMD  2589 US LEC OF MARYLAND, INC. 238      
410-710 7 BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238      
410-710 8 BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238      
410-710 9 BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238      
410-727 A BLTMMDCHDS3  9212 VERIZON MARYLAND, INC. 238      
410-728 A BLTMMDMDDS0  9212 VERIZON MARYLAND, INC. 238      
410-732 A BLTMMDWLDS0  9212 VERIZON MARYLAND, INC. 238      
410-735 A HNVAMDBHAMD  3910 CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD 238      
410-735 0 HNVAMDBHAMD  3910 CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD 238      
410-735 1 HNVAMDBHAMD  3910 CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD 238      
410-735 2 HNVAMDBHAMD  3910 CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD 238      
410-735 3 HNVAMDBHAMD  3910 CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD 238      
410-735 4 BLTMMDLBDS0  9212 VERIZON MARYLAND, INC. 238      
410-735 5 HNVAMDBHAMD  3910 CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD 238      
410-735 6 BLTMMDLBDS0  9212 VERIZON MARYLAND, INC. 238      
410-735 7 BLTMMDLBDS0  9212 VERIZON MARYLAND, INC. 238      
410-735 8 HNVAMDBHAMD  3910 CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD 238      
410-735 9 HNVAMDBHAMD  3910 CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD 238      
410-736 A BLTMMDCHDS2  9212 VERIZON MARYLAND, INC. 238      
410-736 0 CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238      
410-736 1 CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238      
410-736 2 CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238      
410-736 3 CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238      
410-736 4 BLTMMDCHDS2  9212 VERIZON MARYLAND, INC. 238      
410-736 5 BLTMMDCHDS2  9212 VERIZON MARYLAND, INC. 238      
410-736 6 BLTMMDCHDS2  9212 VERIZON MARYLAND, INC. 238      
410-736 7 BLTMMDCHDS2  9212 VERIZON MARYLAND, INC. 238      
410-736 8 CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238      
410-736 9 CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238      
410-743 A HNVAMDAE3MD  6630 USA MOBILITY WIRELESS, INC. 238      
410-746 A BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238      
410-752 A BLTMMDCHDS3  9212 VERIZON MARYLAND, INC. 238      
410-759 A ARBTMDARDS0  9212 VERIZON MARYLAND, INC. 238      
410-759 0   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238      
410-759 1   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238      
410-759 2   2593 CORE COMMUNICATIONS, INC.- MD 238      
410-759 3   2593 CORE COMMUNICATIONS, INC.- MD 238      
410-759 4   2593 CORE COMMUNICATIONS, INC.- MD 238      
410-759 5   2593 CORE COMMUNICATIONS, INC.- MD 238      
410-759 6   2593 CORE COMMUNICATIONS, INC.- MD 238      
410-759 7   2593 CORE COMMUNICATIONS, INC.- MD 238      
410-759 8 BLTMMDCH08Z  4492 VDL, INC. DBA GLOBAL TELECOM BROKERS - MD 238      

<< 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 >>

Last updated: Wed, 20 Nov 2024 21:20:06 UTC

Sponsored by: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.