| 141. | .cix | Database index (Turbo C Utilities) |
| 142. | CICYT | Comisión Interministerial de Ciencia y Tecnología See also: Comisión Interministerial de Ciencia y Tecnología |
| 143. | CIDR | Classless Inter-Domain Routing See also: Classless Inter-Domain Routing |
| 144. | cipherpunk ( revientacifrados,revientaclaves ) | Persona especializada en romper claves criptográficas y superar sistemas de seguridad. No confundir con cyberpunk. See also: cracker; Cryptography; hacker; phracker |
| 145. | .ck1 | Game data (iD/Apogee Commander Keen 1) |
| 146. | .ck2 | Game data (iD/Apogee Commander Keen 2) |
| 147. | .ck3 | Game data (iD/Apogee Commander Keen 3) |
| 148. | .ck4 | Game data (iD/Apogee Commander Keen 4) |
| 149. | .ck5 | Game data (iD/Apogee Commander Keen 5) |
| 150. | .ck6 | Game data (iD/Apogee Commander Keen 6) |
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