Analyze any IPv4 or IPv6 address: validity, private or public, binary form, and CIDR subnet mask, network and broadcast details.
The address is parsed entirely in your browser. No lookup API, no network requests — nothing leaves your device.
Enter any IPv4 or IPv6 address and the tool decodes it entirely in your browser — no server, no lookup API, no network requests. It checks the format, classifies the address as private, loopback, link-local or public, and shows the address as a 32-bit binary value (for IPv4) or a single 32-bit decimal integer. With the optional prefix length (like /24), it computes the subnet mask, network address and broadcast address using plain bit arithmetic.
Both IPv4 and IPv6. For IPv4, the classic dotted-quad format (e.g. 192.168.1.10) with each octet between 0 and 255. For IPv6, the full 8-group hex form as well as the standard compressed form with a single '::' shortcut (e.g. 2001:db8::1). Leading zeros, extra groups and more than one '::' are rejected.
A private address (RFC 1918 for IPv4: 10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16; fc00::/7 for IPv6) is meant for internal networks and is not routed on the public internet. This tool also flags loopback (127.0.0.0/8, ::1) and link-local addresses (169.254.0.0/16, fe80::/10). Anything else is treated as a public address.
Given a prefix length such as /24, the subnet mask is that many leading 1 bits (255.255.255.0 for IPv4). The network address is the IP with the host bits zeroed out, and the broadcast address (IPv4 only) is the IP with the host bits set to 1. All of this is simple bit arithmetic performed in your browser.
No. The address is parsed entirely with JavaScript in your browser. There is no lookup API, no 'what is my IP' call and no network request of any kind — you can use this tool fully offline once the page has loaded.
An IPv4 address is a 32-bit number, so it can be written as a single decimal integer between 0 and 4,294,967,295. For example 192.168.1.10 is 3232235786 in decimal. This is the form used internally by many network libraries and logs.
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