IPv6 Address Validator - Free Online Tool
IPv6 Address Validator
Validate and Classify Any IPv6 Address
Understanding IPv6 Address Classes
Global Unicast
Addresses starting 2000::/3 are the publicly routable equivalent of a normal internet-facing IPv4 address.
Unique Local
fc00::/7 addresses are IPv6's equivalent of RFC 1918 private ranges, intended for internal-only networks.
Link-Local
fe80::/10 addresses are automatically assigned to every interface and only valid on the local network segment.
Client-Side Only
All validation happens locally in your browser — no data is ever sent to a server.
IPv6's Address Space Is Enormous
While IPv4 has about 4.3 billion possible addresses, IPv6's 128-bit address space has roughly 340 undecillion — enough to assign a unique address to every grain of sand on Earth many times over. This scale is why IPv6 dedicates entire address ranges to specific purposes (like fe80::/10 for link-local) rather than carving out small reserved blocks as IPv4 does.
Key Takeaways
- Full Classification: Identifies loopback, unspecified, link-local, unique local, multicast, and global unicast addresses.
- Handles Compression: Correctly parses both compressed (::) and fully expanded address forms.
- Client-Side Only: All validation happens locally in your browser — no data is ever sent to a server.