In general the community looks like 6500M:10CCC, where M is a continent code and CCC is a three digit country code as defined in ISO3166. The information about origin of each AS has been taken from Maxmind GeoIP Database.

For example, BGP community for AS15169: 65007:10840 of the route means this community belongs to a member from North America (7) and the country is USA (840).

Full and always up-to-date description of our communities and tools to engineer the traffic passing our IXP is described on RIPE NCC's website.  The same information can be found on the Route Server page of our website 

Both route servers have got the ability to color the ASes based on their geographical origin. The geographical coloring functionality is not available yet for IPv6.