Does this developer tool upload my input to your servers?

No. These utilities run in your web browser. Your text is processed locally in this tab unless a tool explicitly states otherwise (for example, fetching your public IP uses a minimal server request).

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CIDR calculator

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IPv4 CIDR

Network (CIDR): 192.168.1.0/24
Network address: 192.168.1.0
Broadcast: 192.168.1.255
Subnet mask: 255.255.255.0
Wildcard mask: 0.0.0.255
First host: 192.168.1.1
Last host: 192.168.1.254
Total addresses: 256
Usable hosts: 254

IPv4 CIDR — network and broadcast addresses, subnet mask, and usable host range.

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