Local Calling Guide
Area code/prefix search
Washington Zone 13 (Baltimore LATA), MD
| NPA-NXX |
BLOCK |
Switch |
OCN |
LATA |
LIR |
Eff date |
Disc date |
| 240-512
| A |
BLTMMD91GT0 |
2593 CORE COMMUNICATIONS, INC.- MD |
238 |
|
|
|
| 240-512
| 0 |
|
318J COMCAST IP PHONE, LLC |
238 |
|
2013-05-09 |
|
| 240-512
| 1 |
|
876D ONVOY, LLC - MD |
238 |
|
2021-07-12 |
|
| 240-512
| 2 |
|
7228 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD |
238 |
|
2007-12-03 |
|
| 240-512
| 3 |
|
7228 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD |
238 |
|
2008-10-01 |
|
| 240-512
| 4 |
|
071F BANDWIDTH.COM CLEC, LLC - MD |
238 |
|
2012-07-15 |
|
| 240-512
| 5 |
|
568G PEERLESS NETWORK OF MARYLAND, LLC |
238 |
|
2012-11-23 |
|
| 240-512
| 6 |
|
876D ONVOY, LLC - MD |
238 |
|
2018-05-31 |
|
| 240-512
| 7 |
|
6119 LEVEL 3 COMMUNICATIONS, LLC - MD |
238 |
|
2014-06-25 |
|
| 240-512
| 8 |
|
876D ONVOY, LLC - MD |
238 |
|
2019-02-19 |
|
| 240-512
| 9 |
|
876D ONVOY, LLC - MD |
238 |
|
2019-02-19 |
|
| 240-540
| A |
|
507J THE VOICE APPLICATION NETWORK, LLC |
238 |
|
2025-04-26 |
|
| 240-540
| 0 |
|
073H TELNYX LLC |
238 |
|
2019-09-27 |
|
| 240-540
| 1 |
|
507J THE VOICE APPLICATION NETWORK, LLC |
238 |
|
2016-11-26 |
|
| 240-540
| 3 |
|
568G PEERLESS NETWORK OF MARYLAND, LLC |
238 |
|
2020-03-18 |
|
| 240-540
| 4 |
|
876D ONVOY, LLC - MD |
238 |
|
2020-04-30 |
|
| 240-540
| 5 |
|
876D ONVOY, LLC - MD |
238 |
|
2020-04-30 |
|
| 240-540
| 6 |
|
876D ONVOY, LLC - MD |
238 |
|
2021-03-04 |
|
| 240-540
| 7 |
|
876D ONVOY, LLC - MD |
238 |
|
2020-06-11 |
|
| 240-540
| 8 |
|
876D ONVOY, LLC - MD |
238 |
|
2020-06-11 |
|
| 240-540
| 9 |
|
876D ONVOY, LLC - MD |
238 |
|
2020-06-11 |
|
| 240-843
| A |
BLTMMDCHXNX |
7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC |
238 |
|
|
|
| 240-843
| 1 |
|
876D ONVOY, LLC - MD |
238 |
|
2021-07-12 |
|
| 240-843
| 2 |
|
2593 CORE COMMUNICATIONS, INC.- MD |
238 |
|
2019-05-01 |
|
| 240-843
| 3 |
|
2593 CORE COMMUNICATIONS, INC.- MD |
238 |
|
2019-05-01 |
|
| 240-843
| 4 |
|
7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC |
238 |
|
|
|
| 240-843
| 5 |
|
2593 CORE COMMUNICATIONS, INC.- MD |
238 |
|
2019-05-01 |
|
| 240-843
| 6 |
|
2593 CORE COMMUNICATIONS, INC.- MD |
238 |
|
2019-05-01 |
|
| 240-843
| 7 |
|
2593 CORE COMMUNICATIONS, INC.- MD |
238 |
|
2019-05-01 |
|
| 240-843
| 8 |
|
2593 CORE COMMUNICATIONS, INC.- MD |
238 |
|
2019-05-01 |
|
| 240-843
| 9 |
|
2593 CORE COMMUNICATIONS, INC.- MD |
238 |
|
2019-05-01 |
|
| 240-881
| A |
BLTMMDCH45Z |
071F BANDWIDTH.COM CLEC, LLC - MD |
238 |
|
|
|
| 240-881
| 0 |
|
071F BANDWIDTH.COM CLEC, LLC - MD |
238 |
|
2022-01-06 |
|
| 240-881
| 1 |
|
624H ONVOY SPECTRUM, LLC |
238 |
|
2022-01-20 |
|
| 240-881
| 2 |
|
624H ONVOY SPECTRUM, LLC |
238 |
|
2022-03-14 |
|
| 240-881
| 3 |
|
876D ONVOY, LLC - MD |
238 |
|
2022-01-07 |
|
| 240-881
| 4 |
|
876D ONVOY, LLC - MD |
238 |
|
2022-01-07 |
|
| 240-881
| 5 |
|
624H ONVOY SPECTRUM, LLC |
238 |
|
2022-03-14 |
|
| 240-881
| 7 |
|
568G PEERLESS NETWORK OF MARYLAND, LLC |
238 |
|
2024-11-20 |
|
| 240-881
| 8 |
|
624H ONVOY SPECTRUM, LLC |
238 |
|
2022-01-20 |
|
| 240-881
| 9 |
|
568G PEERLESS NETWORK OF MARYLAND, LLC |
238 |
|
2023-09-22 |
|
| 301-307
| A |
CLMAMDCBRP0 |
9212 VERIZON MARYLAND, INC. |
238 |
|
|
|
| 301-307
| 0 |
|
9212 VERIZON MARYLAND, INC. |
238 |
|
|
|
| 301-307
| 1 |
|
876D ONVOY, LLC - MD |
238 |
|
2016-04-11 |
|
| 301-307
| 2 |
|
876D ONVOY, LLC - MD |
238 |
|
2016-04-11 |
|
| 301-307
| 4 |
|
876D ONVOY, LLC - MD |
238 |
|
2020-11-07 |
|
| 301-307
| 5 |
|
568G PEERLESS NETWORK OF MARYLAND, LLC |
238 |
|
2019-12-28 |
|
| 301-307
| 6 |
|
624H ONVOY SPECTRUM, LLC |
238 |
|
2021-05-23 |
|
| 301-307
| 7 |
|
8697 BALTIMORE-WASHINGTON TELEPHONE (BWT) |
238 |
|
2015-06-20 |
|
| 301-307
| 8 |
|
321J HD CARRIER LLC |
238 |
|
2020-05-01 |
|
| 301-307
| 9 |
|
876D ONVOY, LLC - MD |
238 |
|
2020-11-07 |
|
Last updated: Thu, 01 Jan 2026 03:59:49 UTC
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