| Abbreviation | Definition |
|---|---|
| ccTLD | country code Top Level Domain |
| ccTLDs | Country Code Top-Level Domains |
| CDNC | Chinese Domain Name Consortium |
| CFD | Clothing Fashion Design |
| ch | sites in Switzerland (Confederation of Helvetia) |
| CK | Cook Islands |
| CL | CraigsList |
| CLP | Container Loading Problem |
| CNDRP | CNNIC Domain Name Dispute Resolution Policy |
| COL | College |
| COM | Commercial Firm |
| CONAC | China Organizational Name Administration Center |
| COOP | Co-Op |
| CRIDO | Coalition for Responsible Internet Domain Oversight |
| CVN | CrownVic.net |
| CYC | Christian Youth Channel |
| DCOT | Disney Community of Tomorrow |
| DDNS | Discount Domain Name Services |
| DDNS | Dynamic Domain Name Service |
| DDNS | Dynamic Domain Name Services |