NPA
NXX
CLLI
City, ST
Telco
410
346
SLRNMDSLRS0
SILVER RUN
VERIZON MARYLAND INC.
443
349
BLTMMD91DS0
SILVER RUN
CORE COMMUNICATIONS INC. - MD
443
383
BLTMMDDN4MD
SILVER RUN
GLOBAL NAPS SOUTH INC. - MD
443
732
BLTMMDFMDS0
SILVER RUN
TELEPORT COMMUNICATIONS GROUP AMERICA INC. - MD