Detect your local network info, calculate subnets, convert IPv4 to decimal, check IP classes, and validate addresses — all in your browser with no external requests.
Your Connection & Browser Info
Connection Type
Detecting…
Effective Speed
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Screen Resolution
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Color Depth
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Browser
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Platform / OS
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Language
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Cookies Enabled
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Local IP Detection (WebRTC)
Attempting WebRTC detection…
WebRTC can reveal your local (LAN) IP addresses assigned by your router. This works in most modern browsers without any permissions. Results depend on your network configuration — VPN or firewall may suppress results.
Subnet Calculator (CIDR)
IP Class & Range Checker
IPv4 ↔ Decimal Converter
IPv4 Format Validator
Related: Check your display details → Screen Resolution Checker