The primary purpose of this tool is to
lookup the NPA/NXX of the Local Exchange Company (LEC) based on
the physical address provided. Users may also create an account
so address queries are stored for future reference. CTG3
is a master agent for
CenturyLink and
Comcast Business with a focus on providing support for both
incumbent telco and cable companies.
More useful telco links:
CenturyLink network deployments
Comcast pre-qualification tool
Even more telco links