Anycast

DNS anycast allows your DNS to be replicated many times across 20 locations. This means your website can be easily resolved with the shortest path to improve initial loading speeds. If you have a domain registered outside of the hosting package, you can still take advantage of the DNS anycast. You would first add your domain to the DNS server. This will present you with normal DNS name servers.

Once you have obtained your normal DNS name servers, you would place and order for the DNS anycast with the following API:

https://api.ovh.com/console/#/order/domain/zone/{zoneName}/dnsAnycast/{duration}#POST

This will create you an order for DNS anycast, for an domain outside of the hosting package. Be sure to copy all the current DNS records to the new DNS zone prior to the change of name servers. The actual change of name servers can take up to 24 hours to complete and for the DNS anycast to work.

http://www.ovh.co.uk/domains/dns-anycast/