Vindication (US) »
Blizzard opened three Spanish-language servers for its Latin American localization on July 25, 2008: Quel'Thalas, Drakkari, and Ragnaros. Unlike the other two servers, Ragnaros allowed character transfers from English-language realms which has caused it to be the most populated of the three.
Some time later free transfers were offered to Drakkari were open to mitigate this issue.
The server's time zone is set to CST, like all other Latin American servers.
Those guilds may not be all the active guilds of Ragnaros at the current time. Remember that this is a living article and its just for reference.