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IP Address Info

Enter any IPv4 or IPv6 address to instantly see its binary representation, address class (IPv4), CIDR prefix notation, whether it is private/loopback/link-local/reserved, and the full list of address facts. Useful for network debugging, firewall rules, and subnetting.

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IP Address Info: questions

What is an address class?
IPv4 addresses were originally split into classes A (0.0.0.0–127.255.255.255), B (128–191.x.x.x), C (192–223.x.x.x), D (multicast, 224–239), and E (reserved, 240–255). Classless Inter-Domain Routing (CIDR) replaced classful routing, but the terms persist in networking discussions.
What makes an IP private?
RFC 1918 defines three private ranges: 10.0.0.0/8, 172.16.0.0/12, and 192.168.0.0/16. Addresses in these ranges are not routable on the public internet.
Does this work for IPv6?
Yes. It shows the full expanded form, compressed form, binary groups, and flags like loopback (::1), link-local (fe80::/10), and unique local (fc00::/7).
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