IPv4 to IPv6 Converter
Convert IPv4 addresses to IPv6 mapped and compatible notation, or extract embedded IPv4 addresses from IPv6.
Enter a standard IPv4 address to convert to IPv6 notation.
IPv6 Mapped
::ffff:192.168.1.1
Standard IPv6 representation of IPv4 — ::ffff:0:0/96 prefix
IPv6 Compatible
::192.168.1.1
IPv4-compatible IPv6 address — ::/96 prefix (deprecated but still used)
Full IPv6 (hex)
0000:0000:0000:0000:0000:ffff:c0a8:0101
Full 128-bit IPv6 address in hexadecimal notation
IPv4
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Hex (IPv4 octets)
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IPv4 Decimal
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Enter an IPv6 address with embedded IPv4 (mapped or compatible notation) to extract the IPv4 address.
Extracted IPv4
192.168.1.1
Type
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IPv6 Prefix
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Full IPv6 (hex)
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No embedded IPv4 address found
This IPv6 address does not contain an embedded IPv4 address. It may be a native IPv6 address or use a different format.
- Choose a direction — Select IPv4 → IPv6 to convert an IPv4 address to IPv6 notation, or IPv6 → IPv4 to extract an embedded IPv4 address from an IPv6 address.
- Enter the address — Type or paste an IPv4 address (e.g.,
192.168.1.1) or an IPv6 address with embedded IPv4 (e.g.,::ffff:192.168.1.1). - View results — The converted addresses appear in real-time with IPv6 mapped, compatible, and full hex notation.
All conversion is performed 100% client-side in your browser. No data is sent to any server.
IPv4 to IPv6 mapping is a technique for representing IPv4 addresses within the IPv6 address space. There are two primary methods:
- IPv6 Mapped (
::ffff:0:0/96) — The standard mechanism for representing IPv4 addresses in IPv6, used by modern operating systems for dual-stack communication. Format:::ffff:x.x.x.x - IPv6 Compatible (
::/96) — An older technique for IPv6 transition, now deprecated but still encountered. Format:::x.x.x.x
These mappings allow applications and systems using IPv6 sockets to communicate with IPv4 hosts transparently, forming the basis of IPv6 transition technologies.
| IPv4 | IPv6 Mapped | IPv6 Compatible | Full Hex |
|---|---|---|---|
| 127.0.0.1 | ::ffff:127.0.0.1 | ::7f00:1 | 0000:0000:0000:0000:0000:ffff:7f00:0001 |
| 192.168.1.1 | ::ffff:192.168.1.1 | ::c0a8:101 | 0000:0000:0000:0000:0000:ffff:c0a8:0101 |
| 10.0.0.1 | ::ffff:10.0.0.1 | ::a00:1 | 0000:0000:0000:0000:0000:ffff:0a00:0001 |
| 172.16.0.1 | ::ffff:172.16.0.1 | ::ac10:1 | 0000:0000:0000:0000:0000:ffff:ac10:0001 |
| 8.8.8.8 | ::ffff:8.8.8.8 | ::808:808 | 0000:0000:0000:0000:0000:ffff:0808:0808 |
What is an IPv4-mapped IPv6 address?
An IPv4-mapped IPv6 address is an IPv6 address that embeds an IPv4 address in the lower 32 bits with a prefix of ::ffff:0:0/96 (80 zero bits + 16 bits of ones). It is used by dual-stack systems to represent IPv4 addresses in an IPv6 socket API.
What is the difference between mapped and compatible?
IPv6 Mapped (::ffff:0:0/96) inserts 16 bits of ffff between the zero prefix and the IPv4 address. IPv6 Compatible (::/96) is simply 96 zero bits followed by the IPv4 address. The mapped format is the modern standard; compatible was used in early IPv6 transition but has been deprecated.
How do I detect an embedded IPv4 in an IPv6 address?
Look for the ::ffff: prefix (IPv4-mapped) or :: followed by a dotted decimal notation. The last 32 bits (8 hex digits or 4 decimal octets) contain the IPv4 address. The tool automatically detects both mapped and compatible formats.
Why does my system use IPv4-mapped IPv6 addresses?
Modern operating systems use IPv4-mapped IPv6 addresses to enable seamless dual-stack operation. When an application binds to an IPv6 socket, it can accept connections from both IPv4 and IPv6 clients. IPv4 connections appear as IPv4-mapped IPv6 addresses (::ffff:x.x.x.x) in the socket API.