Local Calling Guide
Area code/prefix search
Washington Zone 14 (Baltimore LATA), MD
<< 1 2
| NPA-NXX |
BLOCK |
Switch |
OCN |
LATA |
LIR |
Eff date |
Disc date |
| 301-912
| 8 |
|
7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC |
238 |
|
|
|
| 301-912
| 9 |
|
7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC |
238 |
|
|
|
| 301-970
| A |
PARLMDPADS0 |
9212 VERIZON MARYLAND, INC. |
238 |
|
|
|
| 301-970
| 0 |
|
2593 CORE COMMUNICATIONS, INC.- MD |
238 |
|
2018-10-24 |
|
| 301-970
| 1 |
|
2593 CORE COMMUNICATIONS, INC.- MD |
238 |
|
2018-10-24 |
|
| 301-970
| 2 |
|
9212 VERIZON MARYLAND, INC. |
238 |
|
|
|
| 301-970
| 3 |
|
876D ONVOY, LLC - MD |
238 |
|
2019-02-19 |
|
| 301-970
| 4 |
|
876D ONVOY, LLC - MD |
238 |
|
2019-02-19 |
|
| 301-970
| 5 |
|
9212 VERIZON MARYLAND, INC. |
238 |
|
|
|
| 301-970
| 6 |
|
624H ONVOY SPECTRUM, LLC |
238 |
|
2021-11-08 |
|
| 301-970
| 8 |
|
2593 CORE COMMUNICATIONS, INC.- MD |
238 |
|
2018-10-24 |
|
| 301-970
| 9 |
|
071F BANDWIDTH.COM CLEC, LLC - MD |
238 |
|
2011-11-13 |
|
| 301-973
| A |
BLTMMDCH45Z |
071F BANDWIDTH.COM CLEC, LLC - MD |
238 |
|
|
|
| 301-973
| 0 |
|
2593 CORE COMMUNICATIONS, INC.- MD |
238 |
|
2018-10-24 |
|
| 301-973
| 1 |
|
2593 CORE COMMUNICATIONS, INC.- MD |
238 |
|
2018-10-24 |
|
| 301-973
| 2 |
|
2593 CORE COMMUNICATIONS, INC.- MD |
238 |
|
2018-10-24 |
|
| 301-973
| 3 |
|
568G PEERLESS NETWORK OF MARYLAND, LLC |
238 |
|
2018-11-20 |
|
| 301-973
| 4 |
|
321J HD CARRIER LLC |
238 |
|
2020-05-02 |
|
| 301-973
| 5 |
|
876D ONVOY, LLC - MD |
238 |
|
2020-10-17 |
|
| 301-973
| 6 |
|
568G PEERLESS NETWORK OF MARYLAND, LLC |
238 |
|
2020-04-19 |
|
| 301-973
| 7 |
|
2593 CORE COMMUNICATIONS, INC.- MD |
238 |
|
2019-04-30 |
|
| 301-973
| 8 |
|
2593 CORE COMMUNICATIONS, INC.- MD |
238 |
|
2018-10-24 |
|
| 301-973
| 9 |
|
2593 CORE COMMUNICATIONS, INC.- MD |
238 |
|
2018-10-24 |
|
<< 1 2
Last updated: Thu, 29 Jan 2026 14:35:03 UTC
Sponsored by: ISP Telecom
Like this site? We accept donations via PayPal.