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.
Ctrl+Enter to run · Ctrl+K to switch tools · Recent button shows input history
Let AI do the hard part. Fix broken HTML, convert to email-safe HTML, or clean up any markup in one click — 3 free AI runs per day, no account needed.
Try the AI HTML FixerFAQ
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).