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CA File - What is a .ca file and how do I open it?

Learn about .CA files and view a list of programs that open them.

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Overview

What is a CA file? A CA file is a cache data file used by Telnet and related terminal-based networking tools to store information about previous or frequently accessed connections. It contains data that helps the software establish remote connections more quickly, such as hostnames , IP addresses , and connection settings.

More Information You will most likely only find CA files on Unix and Linux systems if you use command-line terminals to manage remote servers or networked systems. However, CA files are now a legacy file format since modern systems use updated caching methods or different configuration formats.

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.CA File Extension

Initial Telnet Cache File

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What is a CA file?

A CA file is a cache data file used by Telnet and related terminal-based networking tools to store information about previous or frequently accessed connections. It contains data that helps the software establish remote connections more quickly, such as hostnames , IP addresses , and connection settings.

More Information

You will most likely only find CA files on Unix and Linux systems if you use command-line terminals to manage remote servers or networked systems. However, CA files are now a legacy file format since modern systems use updated caching methods or different configuration formats.

Common CA Filenames

named.ca file - Used by DNS server software such as BIND. It contains a list of the world's root DNS servers and serves as a root hints file. DNS servers use this information as a starting point when locating authoritative servers for resolving domain names. In this context, the CA file helps the DNS server begin the process of resolving queries across the global DNS hierarchy.

How to open a CA file

You can open CA files with any text editor, such as Vim , Microsoft Notepad , and Apple TextEdit . However, editing these files should be done with caution, as incorrect changes can disrupt network or DNS functionality if they are still in use.

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Programs that open or reference CA files

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Category: Misc Files

Updated: March 6, 2026

FAQ

What is a CA file?↓
A CA file is a cache data file used by Telnet and related terminal-based networking tools to store information about previous or frequently accessed connections. It contains data that helps the software establish remote connections more quickly, such as hostnames, IP addresses, and connection settings.
How do I open a .ca file?↓
You can open CA files with any text editor, such as Vim, Microsoft Notepad, and Apple TextEdit. However, editing these files should be done with caution, as incorrect changes can disrupt network or DNS functionality if they are still in use.

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