Check RFC 1918 private
ip = 10.0.0.1
Result: Private (RFC 1918) - Not routable on public internet
Private/Public IP Checker
Enter an IP address to classify it as private, public, loopback, link-local, multicast, broadcast, or reserved. Includes RFC references and security implications.
Enter your values and press Calculate — the result appears here.
Worked examples
Check public IP
ip = 8.8.8.8
Result: Public - Google DNS
Frequently asked questions
Why are some IPs private?
RFC 1918 reserves 10.0.0.0/8, 172.16.0.0/12, and 192.168.0.0/16 for private networks. These addresses are not routable on the internet and require NAT for internet access.
What is a link-local address?
Link-local addresses (169.254.0.0/16 for IPv4, fe80::/10 for IPv6) are automatically assigned when DHCP fails. They only work on the local network segment.
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