IP Address Anonymizer
Mask IP addresses in logs (IPv4/IPv6)
Anonymized output appears here.
About this tool
Processes log files to mask IPv4 and IPv6 addresses while keeping a configurable network prefix for grouping and troubleshooting. It replaces host bits consistently, preserves surrounding log text, and lets you review or download the anonymized result locally. It is a privacy aid, not a guarantee that every identifier in a log has been removed.
Frequently Asked Questions
How does IP masking preserve useful context?
The selected network prefix remains visible while host bits are replaced, allowing broad grouping without exposing the original address.
Does it support both IPv4 and IPv6?
Yes. The anonymizer recognizes common IPv4 and IPv6 text forms in logs.
Can I choose the prefix length?
Yes. Configure the retained IPv4 or IPv6 prefix to balance troubleshooting context and privacy.
Will timestamps and other log text change?
No. The tool targets detected IP addresses and keeps surrounding timestamps, messages, and separators intact.
Is the log uploaded anywhere?
No. Reading, replacement, and download all happen locally in the browser.
Does masking remove every personal identifier?
No. Review logs for usernames, tokens, hostnames, cookies, and other identifiers separately before sharing them.
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