The Wolfram Language has many functions that draw their data from online sources. In order to work, these functions must connect to the internet. Firewalls and proxy servers may deny the Wolfram Language access to online data. Knowing the URLs that it uses allows you to configure any firewalls or proxies to grant access to online data.

Most of the Wolfram Language’s online functions, including natural language queries, need:

  • www.wolfram.com
  • www.wolframalpha.com
  • dataserver.wolfram.com
  • pacletserver.wolfram.com

Wolfram Cloud-related functionality needs:

  • www.wolframcloud.com
  • datadrop.wolframcloud.com

The geographics functionality needs:

  • geo.wolfram.com

The function ProteinData needs:

  • www.rcsb.org

The function FinancialData needs:

  • www.finance.yahoo.com
  • download.finance.yahoo.com
  • ichart.finance.yahoo.com

Functions like WebSearch, WebImageSearch and TextTranslation may require:

  • www.google.com
  • www.bing.com

Functions like URLRead and URLExecute require access to the URL the user specifies in the call.