What is IPv6?
IPv6 (Internet Protocol version 6) is the 128-bit successor to IPv4, developed to solve the critical shortage of IPv4 addresses that began with the internet's explosive growth. While IPv4 offers approximately 4.3 billion unique addresses, IPv6 provides 340 undecillion (3.4 × 10³⁸) — enough to assign an address to every atom on Earth's surface and still have addresses left over. IPv6 addresses are written as eight groups of four hexadecimal digits separated by colons: 2001:0db8:85a3:0000:0000:8a2e:0370:7334, typically compressed using the :: double-colon notation to omit consecutive zero groups.
IPv6 adoption crossed 50% of global internet traffic in major networks by 2025, and is now default for mobile networks, cloud providers, and modern ISPs. Understanding IPv6 addresses — their types, scope, and associated geolocation and organisation — is increasingly essential for network engineers, security professionals, and developers.
How to Use This IPv6 Lookup Tool
1
Enter an IPv6 address
Paste any valid IPv6 address including compressed forms with :: notation (e.g. 2001:db8::1). The tool validates the format before querying.
2
Click Lookup
Geolocation, ISP, ASN, and technical metadata are fetched and displayed instantly.
3
Review technical details
See the full expanded address, address type (Global Unicast, Link-local, Unique Local, Multicast, etc.), and address scope.
4
View on map
If the address has associated coordinates, an interactive map shows the approximate network location.
📑 IPv6 Address Types Explained
Global Unicast (2000::/3)
The public, globally routable addresses — the IPv6 equivalent of public IPv4. These are assigned by RIRs and identify devices uniquely across the internet. Starts with 2 or 3.
Link-local (fe80::/10)
Automatically configured on every IPv6-enabled interface. Only valid on the local network segment — not routed. Used for neighbour discovery and router communications. Not internet-accessible.
Unique Local (fc00::/7)
The IPv6 equivalent of RFC 1918 private addresses. fc00::/8 is officially defined; fd00::/8 is used for locally generated ULA addresses. Not routed on the internet; used within private networks.
Loopback (::1)
The single IPv6 loopback address, equivalent to 127.0.0.1 in IPv4. Refers to the device itself. Never transmitted on any network link.
Multicast (ff00::/8)
Addresses for sending packets to multiple interfaces simultaneously. Replaces IPv4 broadcast. ff02::1 = all nodes on link; ff02::2 = all routers on link. Scope is encoded in the address itself.
6to4 (2002::/16)
Transition mechanism embedding an IPv4 address within an IPv6 address to enable IPv6 traffic over IPv4 networks. Largely superseded by dual-stack deployment but still encountered in legacy infrastructure.
📜 IPv4 vs IPv6 Comparison
💡 Use Cases for IPv6 Lookup
🛡️
Security Investigation
When server logs show suspicious IPv6 connections, look up the address to identify the ASN, ISP, and geographic origin. Combine with our
Blacklist Checker for reputation context.
🌐
Geolocation Debugging
Test how your content delivery, personalisation, or geo-blocking logic handles IPv6 connections from different regions and providers.
🔢
Network Diagnostics
Quickly identify whether an IPv6 address is link-local, global unicast, or ULA — critical for troubleshooting routing and firewall issues. Use alongside our
IP Converter.
📋
Dual-Stack Validation
After enabling IPv6 on your servers, verify your public IPv6 addresses are correctly geolocated, ASN-assigned, and show the expected network metadata.
📑 IPv6 Notation Quick Reference
What is an IPv6 address? +
An IPv6 address is a 128-bit identifier used to uniquely identify a device on an IPv6-enabled network. Written as eight groups of four hexadecimal digits (e.g. 2001:0db8:85a3::8a2e:0370:7334), it replaces the older 32-bit IPv4 system to accommodate the vast number of internet-connected devices.
What does the :: notation mean in IPv6? +
The double colon (::) is a shorthand that replaces one or more consecutive groups of all zeros. For example, 2001:db8:0:0:0:0:0:1 can be written as 2001:db8::1. The :: can only appear once in an address. This tool shows you the full expanded form alongside the compressed notation.
Why is IPv6 geolocation less accurate than IPv4? +
IPv6 geolocation databases are generally less complete and less mature than IPv4 databases, because IPv6 deployment is newer and ISPs' IPv6 address assignments aren't as extensively mapped to physical locations. Accuracy improves over time as more IPv6 deployment data becomes available.
What is SLAAC? +
SLAAC (Stateless Address Autoconfiguration) allows IPv6 devices to automatically generate their own global unicast address using the network prefix advertised by the local router plus a host portion derived from the device's MAC address (or a privacy-randomised value). No DHCP server is required for basic IPv6 connectivity.
Can an IPv6 address be private like IPv4? +
Yes. Unique Local Addresses (ULA, fc00::/7 range, commonly fd00::/8) are the IPv6 equivalent of RFC 1918 private addresses. They're used within private networks and not routed on the internet. Link-local addresses (fe80::/10) are another non-routable type, valid only on the local network segment.
How do I find my own IPv6 address? +
Use our
My IP Address tool — it automatically detects and displays both your IPv4 and IPv6 addresses if your connection supports IPv6. On a device, you can also check network settings or run "ipconfig" (Windows) or "ifconfig" / "ip a" (Linux/Mac) in a terminal.
Does IPv6 need NAT? +
No. IPv6 has enough addresses for every device to have a unique global address, eliminating the need for Network Address Translation (NAT). Every device can have a public IPv6 address, simplifying end-to-end connectivity but requiring firewall rules to control access instead of relying on NAT as a security boundary.
Is IPv6 faster than IPv4? +
IPv6 itself isn't inherently faster, but it can be in practice because it eliminates NAT traversal overhead, has simpler packet headers (fixed 40 bytes vs. variable IPv4 headers), and supports Path MTU Discovery more efficiently. The actual speed difference depends more on the network path than the protocol version.
What is a /64 subnet in IPv6? +
A /64 is the standard subnet size for a single IPv6 network segment — the first 64 bits are the network prefix, and the last 64 bits are the interface identifier. A /64 provides 2⁶⁴ (18 quintillion) addresses per segment. The wasteful-seeming size is intentional, allowing SLAAC auto-configuration and EUI-64 host addressing.
What is dual-stack? +
Dual-stack is when a device or network simultaneously supports both IPv4 and IPv6. The device has both an IPv4 and an IPv6 address and can communicate with both types of endpoints. This is the current recommended deployment model during the global transition from IPv4 to IPv6.
What does "Global Unicast" mean? +
Global Unicast Addresses (GUA) are the public, globally routable IPv6 addresses — equivalent to public IPv4 addresses. They start with 2000::/3 (binary 001). Every internet-connected IPv6 device needs a GUA for internet communication. These are assigned by RIRs and delegated through ISPs.
Can IPv6 addresses be blocked like IPv4? +
Yes, but the huge address space makes blocking individual IPv6 addresses less effective than IPv4. Security tools often block entire /48 or /64 prefixes belonging to an organisation (identifiable via ASN lookup). IPv6 firewall rules using CIDR-notation prefixes work the same way as IPv4 rules.
What is IPv6 privacy extensions? +
RFC 4941 Privacy Extensions randomise the interface identifier portion of a device's IPv6 address periodically, preventing long-term tracking based on a stable address. Most modern operating systems (Windows, macOS, Linux, Android, iOS) enable privacy extensions by default for outbound connections.
Is this IPv6 Lookup tool free? +
Yes — completely free, no sign-up, no limits. Lookups query live geolocation APIs directly from your browser. No data is stored on our servers. Results include full technical analysis, geolocation, ISP/ASN, and an interactive map.
Why might an IPv6 lookup show no geolocation? +
Some IPv6 addresses — especially newer allocations, private ranges (fc/fd), link-local (fe80::), or documentation addresses (2001:db8::) — have no geolocation data in the database. The tool will still show the technical metadata (type, scope, ASN if available) even when geolocation data is absent.