NALENND™ Online
Wire Center Lookup 
Search for one or more Wire Centers by CLLI, LATA, or State/Province. At least one parameter must be entered and multiple parameters can be specified. The 8 character wire center CLLI, LATA, State/Province, office name, and USAC reported ILEC (for high cost wire centers) are displayed for each matching Wire Center.
List all NPA NXX combination served from a particular Wire Center and/or Switch.