If Blackbaud hosts both Blackbaud NetCommunity and The Raiser's Edge\The Education Edge AND you use Blackbaud NetCommunity Spark :

http://####.bbnc.bbcust.com/PluginService/MasterService.asmx
Replace #### with your organization's Site ID.

If Blackbaud hosts both Blackbaud NetCommunity and The Raiser's Edge\The Education Edge:

http://####.plugin.bbcust.com/PluginService/MasterService.asmx
Replace #### with your organization's Site ID.

If Blackbaud hosts Blackbaud NetCommunity, and The Raiser's Edge or The Education Edge is hosted elsewhere:

http://####.bbnc.bbcust.com/PluginService/MasterService.asmx
Replace #### with your organization's Site ID.


If Blackbaud does NOT host Blackbaud NetCommunity, The Raiser's Edge or The Education Edge:
The PluginService URL should point to the NetCommunity web server.  This MAY be a fully qualified domain name OR a hostname and would need to be verified by your IT department:
 
http://<hostname>/PluginService/MasterService.asmx where <hostname> is the name of your NetCommunity web server.
OR
https://<fully-qualified-domain-name>/PluginService/MasterService.asmx where <fully-qualified-domain-name> is the URL of your Website.

 
To change the PluginService URL in the Raiser's Edge:
  1. Log into the Raiser's Edge BBNC plug-in
  2. Click Blackbaud NetCommunity within The Raiser's Edge BBNC Plug-in
  3. Click the options link in the upper right hand corner
  4. Change the PluginService URL
To change the PluginService URL in the Education Edge:
  1. Log into the Education Edge Edge BBNC plug-in
  2. Click Blackbaud NetCommunity within The Education Edge BBNC Plug-in
  3. Click the options link under the Administration options
  4. Change the PluginService URL