Wikipedia Zero/IP Addresses

Carriers/Operators participating in Wikipedia Zero should use an IP address-based zero-rating scheme in order to support HTTPS and have the simplest possible configuration in their systems.

The following blocks should be used for the IP address-based zero-rating scheme. These IP addresses represent production Wikimedia servers only.

91.198.174.192/27 91.198.174.224/28 - can be removed after February 15, 2014 198.35.26.96/27 208.80.154.224/27 2620:0:861:ed1a:0:0:0:0/64 2620:0:862:ed1a:0:0:0:0/64 2620:0:863:ed1a:0:0:0:0/64

Opera Mini
Opera Mini zero-rating requires a partnership between a partner and the Opera corporation, and facilitation between Wikimedia Foundation and the Opera corporation. Incidentally, the Wikimedia Foundation and the Opera corporation need to cooperate on some domain name related things to establish proper Wikipedia Zero zero-rating configurations, but the operator only needs to know specific IP addresses in the Opera Mini load balancing infrastructure that should be combined with the IP addresses above for IP address-based zero-rating; these additional IP addresses are communicated as part of this facilitation.

Desktop and Sister Projects
As of 6-March-2014, the Wikipedia Zero mobile web browsing experience presents a warning to users when they attempt to navigate from the Wikipedia Zero mobile web browsing experience to the Desktop version of Wikipedia or to Wikimedia sister projects (e.g., Wiktionary). Wikipedia Zero banners and page rewriting (e.g., for interstitial warnings) are not yet set up on the Wikimedia Desktop sites nor mobile web versions of the sister projects yet, even though the IP addresses above cover those sites. Thus, it's best to warn the user of the potential of charges even if those charges wouldn't generally accrue until the user navigated away from the Desktop or sister projects.