Install Subnet Calculator for offline use
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Subnet Calculator
IP Address / CIDR
Enter an IP address with CIDR prefix (e.g. 192.168.1.0/24) or an IP with a separate subnet mask.
or
IPv6 Address / Prefix
Enter an IPv6 address with prefix length (e.g. 2001:db8::/32 or ::1/128).
Quick Reference — Common Subnet Masks
Prefix Subnet Mask Wildcard Total Hosts Usable Hosts Common Use

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