Binary to IP Converter Online Free Tool
Convert 32-bit binary to IPv4 or 128-bit binary to IPv6 - with classification, canonical form. Free, client-side, instant, offline, secure.
Decode 32-bit binary into IPv4 dotted-decimal or 128-bit binary into IPv6. Auto-detects length, classifies the address (class, private, loopback, link-local, multicast), and renders IPv6 in RFC 5952 canonical form.
How to Use Binary to IP Converter Online Free Tool
- Paste binary digits - one IP per line. Spaces, dots, colons, and underscores are stripped before parsing, so
11000000.10101000.00000001.00000001works as easily as the same string with no separators. - Pick a version, or leave on Auto. Auto-detect reads the line length: 32 bits → IPv4, 128 bits → IPv6, anything else → error. Force a specific version when you want strict validation.
- Choose IPv6 format. Canonical (default, per RFC 5952) uses lowercase hex, strips leading zeros per group, and collapses the longest zero run to
::. Full keeps all 32 hex digits with leading zeros - handy for alignment in tables. - Read the classification notes. Each decoded IP is followed by
# Class X, private (RFC 1918 …), etc. For IPv4 you’ll see class A/B/C/D/E plus any special-range flags. For IPv6 you’ll see loopback, link-local, unique-local, multicast, or documentation. - Watch the stats line: total lines · IPv4 count · IPv6 count · private count · loopback count · multicast count · validity summary. Useful when verifying a batch of addresses all fall in the expected range.
- Fix errors inline. Bad lines (wrong length, non-binary chars) show
ERROR: expected 32 bits for IPv4, got 31or similar, named with exact counts / positions. Other lines still decode cleanly. - Copy or download the output.
Ctrl+Enter/Cmd+Enterruns convert + copy together.
Frequently Asked Questions
What input formats does the tool accept?
32-bit binary for IPv4 (four 8-bit groups like 11000000.10101000.00000001.00000001) and 128-bit binary for IPv6. The tool auto-detects which version to produce.
What does IP classification mean?
After conversion, the tool labels the address: public, private (RFC 1918), loopback, multicast, link-local, documentation, or reserved. This helps you understand the address at a glance.
Does it handle CIDR notation in the output?
Yes. You can optionally attach a prefix length (e.g., /24) to the result. The tool also shows the network and broadcast addresses for the specified prefix.
Is IPv6 output canonical?
Yes. IPv6 output follows RFC 5952: lowercase hex, longest zero run compressed with ::, and leading zeros dropped from each group.
Is my data secure?
Yes. All conversion happens in your browser. Your binary inputs and IP outputs never touch a server.
Do you log anything?
No. The tool is fully client-side.
Is this tool free?
Yes, with no sign-up and no usage limits.
What if my binary has the wrong length?
The tool reports the exact bit count and tells you how many more or fewer bits you need for valid IPv4 (32) or IPv6 (128).
Can I input binary with separators?
Yes. Spaces, dots, colons, and newlines are stripped automatically so formatted input pastes cleanly.
Why would I convert binary to an IP address?
Network engineering classes, debugging packet captures that show raw binary, studying subnet math, and verifying hand-calculated IP arithmetic.