Similar to ドッペルゲンガー・ドメイン

.cm

.cn

.co

Codecademy

CodePlex

Collaborative real-time editor

Common Gateway Interface

.coop

.cr

Craigslist

.cu

Cuil

.cw

.cx

.cy

.cz

Datagram Congestion Control Protocol

Datagram Transport Layer Security

DAViCal

.de

Disqus

.do

.dz