IP Calculator

IP Subnet Calculator

A modern, sipcalc-inspired calculator for IPv4 and IPv6 with batch input, recursive subnet splitting, and DNS lookups.

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CIDR (24), dotted netmask (255.255.255.0), hex mask (0xffffff00), or paste 192.168.1.10/24 directly.
Quick:
IPv4 CIDR reference table — click a row to apply
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Compressed (2001:db8::1) or expanded form, or paste 2001:db8::1/64 directly. IPv4-mapped (::ffff:192.0.2.1) is supported.
Quick:
IPv6 prefix reference — click a row to apply
Mixed IPv4/IPv6 supported. Comments after # are ignored.
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