Private IP Checker
Instantly check if an IP address belongs to a private network (RFC 1918) or is publicly accessible.
Private IP Checker
Quick examples:
Understanding Private IP Addresses
Private IP addresses are reserved for use within internal networks, such as your home WiFi or office LAN. These addresses are not unique globally and cannot be routed on the public internet. They are defined by the Internet Engineering Task Force (IETF) in RFC 1918.
Because they are not routable, devices with private IPs use Network Address Translation (NAT) to access the internet through a router that has a single public IP.
RFC 1918 Address Ranges
| Class | Range | CIDR | Addresses |
|---|---|---|---|
| Class A | 10.0.0.0 – 10.255.255.255 | 10.0.0.0/8 | 16,777,216 |
| Class B | 172.16.0.0 – 172.31.255.255 | 172.16.0.0/12 | 1,048,576 |
| Class C | 192.168.0.0 – 192.168.255.255 | 192.168.0.0/16 | 65,536 |
Other Special Ranges
Loopback (Localhost)
Used for testing on your local machine.
Link-Local (APIPA)
Auto-assigned when DHCP fails.
Frequently Asked Questions
What is a private IP address?
A private IP address is reserved for use within a private network and is not routable on the public internet. Common ranges include 192.168.x.x and 10.x.x.x.
What happens if I try to visit a private IP?
If the IP exists on your local network, you might access a device (like a router configuration page). If you are outside that local network, the request will fail because private IPs cannot be routed over the internet.
Can I modify my private IP address?
Yes, usually via your router's DHCP settings or by manually configuring a static IP on your device's network adapter settings.