IPv6 lookup, WHOIS, CIDR, and conversion tools.
Inspect IPv6 ownership and network data, calculate a subnet range, convert IPv4-mapped addresses, and switch between compressed and expanded IPv6 notation. Built for engineers working in logs, DNS, routing, firewalls, and incident response.
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IPv6 tools for common network tasks
Choose the task you need: investigate an address, inspect registry data, calculate a prefix range, or normalize address notation.
IPv6 Lookup
Find ownership, ASN, and location signals for a given IPv6 address.
IPv6 WHOIS
Query registry data to see allocation details and abuse contacts.
IPv4 → IPv6
Convert an IPv4 address into its IPv6 mapped format.
IPv6 CIDR to Range
Translate a prefix into first/last IPv6 addresses and host counts.
IPv6 Compress
Shrink verbose IPv6 notation into its shortest readable form.
IPv6 Expand
Expand a compressed IPv6 into full 8 group notation.
Work with IPv6 addresses without guesswork
IPv6 is more than a longer address format. Prefix length, address scope, registry allocation, and text representation all change how an address should be interpreted in practice.
Addressing
IPv6 replaces IPv4 address scarcity.
IPv6 uses 128-bit addresses and removes the need to stretch private IPv4 space indefinitely. Learn how it differs from IPv4 before troubleshooting a dual-stack network.
Compare IPv6 and IPv4Notation
One address, several valid text forms.
Compression removes unnecessary zeroes; expansion restores all eight groups. Both forms describe the same address, but exact text matters in logs and configuration files.
Learn IPv6 notationNetworks
A CIDR prefix describes a network range.
The prefix length determines the network and host bits. Calculate the first and last address when planning subnets, checking routes, or reviewing firewall rules.
Learn IPv6 CIDR notation