IPv6 Compressor
Paste any IPv6 address to get its compressed (RFC 5952) and fully expanded forms. Handles ::, leading zeros, zone IDs and IPv4-mapped addresses.
- Compressed (RFC 5952)2001:db8::ff00:42:8329
- Expanded2001:0db8:0000:0000:0000:ff00:0042:8329
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Frequently asked questions about IPv6 Compressor
RFC 5952 defines a canonical short form: each group drops leading zeros, hex is lowercase, and the longest run of consecutive all-zero groups is replaced by '::' (leftmost run wins on a tie, and '::' is only used for two or more groups). This tool applies those rules and also shows the full, uncompressed eight-group form.
No. Parsing and formatting run entirely in your browser, nothing is uploaded. As an EU-built, EU-hosted provider, Uptimeify keeps your workflow off US infrastructure and clear of US Cloud Act exposure, which matters for agencies handling client data under GDPR.
Comparing IPv6 addresses as plain text fails when one is compressed and another expanded: they look different but are equal. Normalize them here, then let Uptimeify monitor your IPv6 hosts and endpoints so you're alerted the instant one goes dark.
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A compressed address is only notation. Uptimeify checks whether the host behind it stays reachable, and keeps an eye on the AAAA records in DNS at the same time.