Network Engineering
IP Address Classifier
Enter an IP address or CIDR block to classify it as private, public, loopback, link-local, multicast, or special-use, with host count and subnet information.
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About this tool
IP Address Classifier
The IP Address Classifier identifies IPv4 and IPv6 address classifications, CIDR host counts, broadcast addresses, and subnet masks for any IP or CIDR notation.
• Quickly confirm whether an IP is private before exposing it
• Calculate host count for a CIDR block during VPC planning
• Identify CGNAT or link-local addresses during network debugging
• Convert between CIDR prefix length and dotted-decimal subnet mask
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FAQ
What does this tool tell you?
The IP Address Classifier identifies IPv4 and IPv6 address classifications, CIDR host counts, broadcast addresses, and subnet masks for any IP or CIDR notation.
What affects the result most?
Classifies IPv4 address: private (RFC 1918), loopback (127.x), link-local (169.254.x), multicast (224-239.x), public. RFC 1918 private ranges: 10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16. Special ranges: 100.64.0.0/10 (CGNAT), 198.18.0.0/15 (benchmarking), 192.0.2.0/24 (TEST-NET).
How should I use the result?
Treat the tool's output as a first-pass check, not a proof of correctness. A clean pass means no issues in the patterns this tool recognizes; a failure points to a specific problem you can investigate in your source. The underlying spec is the authoritative source for edge cases.
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