Private vs Public IP Checker
Check if an IPv4 address is private (RFC 1918) or public. Private IPs are used inside local networks; public IPs are routable on the internet. Runs in your browser.
Check Private or Public IP
Enter any IPv4 address and click Check to see if it is private (RFC 1918), public, or a special range (loopback, link-local).
Result
| IP address | 192.168.1.1 |
|---|---|
| Type | Private |
| Range | 192.168.0.0/16 |
| Description | Private (RFC 1918). Used in local networks; not routable on the internet. |
What Is a Private IP Address?
Private IP addresses (RFC 1918) are reserved for use within private networks and are not routable on the public internet. The three ranges are: 10.0.0.0/8 (10.x.x.x), 172.16.0.0/12 (172.16.x.x through 172.31.x.x), and 192.168.0.0/16 (192.168.x.x). Home routers, office LANs, and cloud VPCs use these internally; traffic to the internet is translated to a public IP via NAT. Checking whether an IP is private helps with firewall rules, troubleshooting, and security.
To verify an address, use this tool or our IP address validator. For the class (A, B, C) of an IP see IP class finder. For subnet boundaries use the subnet calculator and network address calculator. For geolocation of a public IP use IP lookup; for detecting VPN/proxy use VPN check.
What Is a Public IP Address?
A public IP is assigned by an ISP or cloud provider and is routable on the internet. Servers, home gateways (on the WAN side), and devices that need to be reached from the internet have public IPs. When you visit a website, it sees your public IP (or your NAT gateway's public IP). Use What is my IP to see your current public IP and IP lookup for its location and ISP. To see if an IP is behind a VPN or proxy use VPN detection.
Why It Matters
Security policies often allow or deny traffic by private vs public range. Knowing that 10.0.0.1 is private and 8.8.8.8 is public helps with debugging and design. Our IP range calculator and CIDR calculator help you work with blocks; the IP block size calculator gives host counts. For connectivity tests use ping test and traceroute.
FAQs
What is a private IP address?
Private IPs are reserved for use inside private networks (e.g. 10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16). They are not routable on the public internet.
What is a public IP address?
A public IP is routable on the internet. It is assigned by an ISP or cloud provider and can be used to reach the host from the internet.
How do I check if an IP is private or public?
Check the range: 10.x.x.x, 172.16.x.x–172.31.x.x, and 192.168.x.x are private. Our IP address validator and this page explain the ranges; you can also use our tools to validate any IP.
Can a private IP be seen on the internet?
No. Private addresses are not routed on the public internet. Outbound traffic from a private IP appears under the network’s public IP (NAT).