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IP Address Information
Parse and classify an IPv4 or IPv6 address: scope and the RFC that defines it, binary / hex / decimal / integer forms, IPv6 compress & expand, reverse-DNS name, and CIDR membership. Everything runs in your browser.
100% client-side. No external API calls, no geolocation, no logging. “Public” describes the address space only — nothing is looked up about who owns or where the address is. GDPR/DORA compliant.
IPv4 (dotted decimal), IPv6 (including :: and ::ffff:1.2.3.4), or a bare integer (32-bit → IPv4, up to 128-bit → IPv6).
How to use this tool
- Paste an IPv4 address (
192.168.1.100), an IPv6 address (2001:db8::1), or a plain integer, then press Analyze (or Enter). - Read the scope badge: it names the range and links the RFC that defines it. A “Public” result only means the address is globally routable — no lookup is performed.
- Use the representations (binary, hex, decimal/integer; for IPv6 the compressed and expanded forms) and the reverse-DNS name (
in-addr.arpa/ip6.arpa) for PTR records. - Enter a CIDR range below the result to test membership (IPv4 and IPv6). Pair it with the CIDR Calculator to plan subnets.
- Export the result (Copy / JSON / CSV / TXT). Nothing leaves your browser.
IP Address Reference
Private / shared IPv4
10.0.0.0/8— Private (RFC 1918)172.16.0.0/12— Private (RFC 1918)192.168.0.0/16— Private (RFC 1918)100.64.0.0/10— CGNAT (RFC 6598)
Special IPv4
0.0.0.0/8— This host (RFC 1122)127.0.0.0/8— Loopback (RFC 1122)169.254.0.0/16— Link-local (RFC 3927)192.0.2.0/24,198.51.100.0/24,203.0.113.0/24— Documentation (RFC 5737)224.0.0.0/4— Multicast (RFC 5771)240.0.0.0/4— Reserved (RFC 1112)255.255.255.255— Broadcast (RFC 919)
IPv4 classes (historical)
- A: 0.0.0.0 – 127.255.255.255
- B: 128.0.0.0 – 191.255.255.255
- C: 192.0.0.0 – 223.255.255.255
- D: 224.0.0.0 – 239.255.255.255 (multicast)
- E: 240.0.0.0 – 255.255.255.255 (reserved)
Classful addressing was obsoleted by CIDR (RFC 4632); shown for reference only.
IPv6 special
::1/128— Loopback (RFC 4291)::/128— Unspecified (RFC 4291)::ffff:0:0/96— IPv4-mapped (RFC 4291)2001:db8::/32— Documentation (RFC 3849)2001::/32— Teredo (RFC 4380)2002::/16— 6to4 (RFC 3056)fc00::/7— Unique local (RFC 4193)fe80::/10— Link-local (RFC 4291)ff00::/8— Multicast (RFC 4291)