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About IP Address Classifier – IPv4 & IPv6 Scope & Type Checker
Classify any IPv4 or IPv6 address against authoritative IANA Special-Purpose Address Registries locally in your browser.
Instantly determine whether an address belongs to private (RFC 1918 / RFC 4193), loopback, link-local, carrier-grade NAT, multicast, or documentation scopes.
Input is processed locally in your browser and is not sent to Navorika.
How the calculation works
Authoritative standards
Evaluates inputs against IANA Special-Purpose Address Registries and IETF RFC specifications (RFC 6890, RFC 1918, RFC 4291, RFC 3927, RFC 5737).
Most-specific match
Subnets are matched using longest prefix match (e.g. 192.0.2.0/24 Documentation takes precedence over 192.0.0.0/24 IETF Protocol).
Zero network telemetry
Evaluates address syntax entirely client-side without pinging, DNS queries, or outbound HTTP requests.
How to use this tool
- 1Enter any IPv4 address (e.g. 192.168.1.1) or IPv6 address (e.g. 2001:db8::1).
- 2The classifier automatically identifies the IP version (IPv4 or IPv6).
- 3Inspect the classification (Private-Use, Loopback, Link-Local, Global Unicast, Documentation, etc.).
- 4Review the governing RFC specification and matching CIDR prefix block.
- 5Copy the classification summary for documentation or security audit reports.
Understanding the result
Private addresses (such as 10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16, and fc00::/7) are non-routable on the public internet and intended for internal networks.
Link-local addresses (169.254.0.0/16 and fe80::/10) are used for auto-configuration and communicate only within the same physical or virtual link.
Global Unicast indicates an address from globally routable address space, but does not indicate whether a device is currently powered on or reachable.
Important limitations
- Classification is based on address allocation ranges, not real-time network reachability or routing tables.
- A syntactically global address does not imply public reachability; firewall rules or NAT often restrict inbound traffic.
- Address allocations follow IANA registry specifications and can be updated by future RFCs.
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Frequently asked questions
What is the difference between private and public IP addresses?
Private IP addresses (defined in RFC 1918 for IPv4 and RFC 4193 for IPv6) are reserved for internal local networks and cannot be routed across the public Internet without Network Address Translation (NAT).
What is Carrier-Grade NAT (CGNAT)?
RFC 6598 allocates 100.64.0.0/10 for Shared Address Space, enabling Internet Service Providers to perform NAT at scale without colliding with subscriber RFC 1918 private subnets.
Does this tool make any network requests?
No. All classification is performed locally in your browser using mathematical bitwise prefix checks without contacting external servers or performing DNS lookups.
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