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Chmod Calculator
Convert Unix file permissions between checkboxes, octal (755) and symbolic (rwxr-xr-x).
Developer
IPv4 Subnet Calculator
Enter an IPv4 address and prefix length to see the network address, mask, broadcast address and usable host range.
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Frequently asked questions
Is my data uploaded?
No. Everything is calculated in your browser and nothing you enter is sent to a server. No account is needed.
Do I need an account?
No. IPv4 Subnet Calculator is free to use without signing up.
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