Subsequently, country-code top-level domain (ccTLD) is an Internet top-level domain generally used or reserved for a country or region like .UK as exapmle.
More than 300 ccTLD name registries responsible for servicing hundreds of millions of domain names worldwide.Internationalized country code have began implement by Internet Assigned Numbers Authority (IANA) in 2010.
Microsoft security blog “Therats in th cluod” by Tim Rains gives great view on Domain Name System (DNS) attacks and and Distributed Denial of Service (DDoS) attacks.
We know ccTLD registrars are vulnerable to attacks like last year attack on Spamhaus which get the record for the largest DDoS ever, ,Microsoft have registered domains under a number of different ccTLDs for its regional subdomains, such as microsoft.Nl for Microsoft Netherland.
Tim Rains add between May of 2012 and July of 2013 Seventeen ccTDLS were compromises are penetrated by SQLi exploits and social engineering methodes and Microsoft DNS registars in specific countries and regions were compromised too.