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Convert IPv4 addresses to IPv6 format using various mapping methods (IPv4-mapped, IPv4-compatible, 6to4 addressing), shows binary representations, displays both formats side-by-side, supports CIDR notation for networks, and explains tunneling mechanisms.
Note: AI can make mistakes, so please double-check it.
RFC 4291
Encapsulates an IPv4 address within an IPv6 structure.
Enter an IPv4 address to convert
Common questions about this tool
Paste your ipv4 to ipv6 code into the formatter, and it automatically applies proper indentation, spacing, and organization. The tool improves code readability while maintaining functionality.
Yes, the ipv4 to ipv6 beautifies code by adding consistent formatting, proper indentation, and organizing structure. This makes code easier to read, debug, and maintain without changing functionality.
No, formatting only changes whitespace and organization. It doesn't alter code logic, syntax, or behavior, so your ipv4 to ipv6 code works exactly the same after formatting.
Yes, the formatter offers customization options including indentation style, line length, and formatting preferences to match your project's coding standards and team preferences.
Paste minified code into the formatter, and it automatically adds proper indentation and line breaks to make the code readable again. This is useful for debugging or reviewing compressed code.
Verified content & sources
This tool's content and its supporting explanations have been created and reviewed by subject-matter experts. Calculations and logic are based on established research sources.
Scope: interactive tool, explanatory content, and related articles.
ToolGrid — Product & Engineering
Leads product strategy, technical architecture, and implementation of the core platform that powers ToolGrid calculators.
ToolGrid — Research & Content
Conducts research, designs calculation methodologies, and produces explanatory content to ensure accurate, practical, and trustworthy tool outputs.
Based on 1 research source:
Learn what this tool does, when to use it, and how it fits into your workflow.
This tool converts a single IPv4 address into one or more IPv6 forms. You enter one IPv4 address and pick a mapping mode. The tool then shows the IPv6 address in a short form and in full uncompressed form. It also shows which standard the mapping follows and a short note on what that mapping is used for. You can copy the IPv6 or IPv4 result. An optional step sends the IPv4 address to a remote service and returns a short analysis and recommendation about the address and IPv6 transition.
IPv4 and IPv6 are different address formats. IPv4 uses four numbers separated by dots. IPv6 uses eight groups of hex digits separated by colons. When you need to represent an IPv4 address inside an IPv6 context, or when you use a transition mechanism, you need a defined way to map the IPv4 address into an IPv6 form. Doing that by hand is easy to get wrong. This tool applies the mapping rules for you and shows the result in both compressed and full form.
The tool is for developers, network engineers, and anyone who configures or debugs dual-stack or IPv6 transition setups. You need a basic idea of what IPv4 and IPv6 are. The tool explains each mapping mode in plain language.
IPv4 addresses are 32 bits long and are usually written as four decimal numbers between 0 and 255, for example 192.168.1.1. IPv6 addresses are 128 bits long and are written as eight groups of up to four hex digits, for example 2001:0db8:85a3::8a2e:0370:7334. The two formats are not directly compatible. To use an IPv4 address in an IPv6 context, or to send IPv6 over an IPv4 network, standards define how to embed or map the IPv4 address into an IPv6 address. A related operation involves converting ASCII to hexadecimal as part of a similar workflow.
Several mapping methods exist. IPv4-mapped IPv6 embeds the IPv4 address in the last 32 bits of a fixed IPv6 prefix. It is used inside software that handles both IPv4 and IPv6. 6to4 uses a special prefix and the IPv4 address to form an IPv6 address so that IPv6 traffic can be carried over IPv4. NAT64 uses a well-known prefix so that IPv6-only clients can reach IPv4-only servers through a translator. Link-local embedded wraps the IPv4 address in a link-local IPv6 prefix for use on a single network segment. Each method has a specific format and use. The tool implements these mappings and shows the result so you can copy it into configs or docs.
Converting by hand means looking up the RFC format and doing the hex conversion for each octet. The tool does the conversion and shows both a short IPv6 form and the full uncompressed form so you can check or paste into systems that expect one or the other.
Getting the IPv4-mapped IPv6 form. Your application or library expects an IPv4 address in IPv6-mapped form (::ffff:x.x.x.x). You enter the IPv4 address, select IPv4-Mapped, and copy the IPv6 result. You use it in config or code where dual-stack handling is needed. For adjacent tasks, binary to hexadecimal addresses a complementary step.
Checking 6to4 or NAT64 format. You are configuring a 6to4 relay or a NAT64 gateway and need the correct IPv6 form for a given IPv4. You enter the IPv4, choose 6to4 or NAT64, and read the compressed and full forms. You copy the one your system expects.
Link-local embedded address. You need to represent an IPv4 address inside a link-local IPv6 prefix for a local network or test. You select Link-Local and copy the result. You use it only within the same segment as the tool notes.
Documentation or teaching. You are writing a doc or teaching IPv6 transition. You enter an example IPv4, switch between the four modes, and show how the same address maps to different IPv6 forms. You use the mapping concept and usability text to explain when each form is used. When working with related formats, converting binary to decimal can be a useful part of the process.
Quick check before config. You are about to paste an IPv6 address into a firewall or router. You use the tool to generate the expected form from the IPv4 and compare it with what you have. You avoid typos or wrong prefix.
The tool takes the IPv4 address and splits it into four decimal octets. Each octet must be between 0 and 255. The tool converts each octet to two hex digits (e.g. 192 to c0, 168 to a8). It then combines octets as required by each mapping mode.
For IPv4-mapped (RFC 4291) the result is the prefix ::ffff: followed by the IPv4 address in dotted form, or the full form 0000:0000:0000:0000:0000:ffff:hhhh:hhhh where the last two groups are the hex of the first two octets and the last two octets. For 6to4 (RFC 3056) the prefix is 2002: and the next two groups are the hex of the four octets (two octets per group), followed by ::. For NAT64 (RFC 6052) the prefix is 64:ff9b:: and then the IPv4 in dotted form, or in full form the last two groups are the hex of the four octets. For link-local (RFC 4291 variant) the prefix is fe80:: and the last two groups are the hex of the four octets. The tool outputs both a compressed form (with :: where possible) and the full eight-group form in lowercase hex. In some workflows, checking your IP address is a relevant follow-up operation.
| Mode | Standard | Typical use |
|---|---|---|
| IPv4-Mapped | RFC 4291 | Dual-stack apps; not globally routable over IPv6. |
| 6to4 | RFC 3056 | IPv6 over IPv4; needs 6to4 relay; often obsolete. |
| NAT64 | RFC 6052 | IPv6-only clients talking to IPv4-only servers via NAT64 gateway. |
| Link-Local | RFC 4291 (variant) | Same network segment only; not routed off the link. |
Each mode produces a different IPv6 prefix and layout. The tool shows the exact format and a short usability note for the selected mode.
Only one IPv4 address is accepted per conversion. The tool does not accept a CIDR block or a list of addresses. For a subnet or range you need to convert each address separately or use another tool.
Enter the address in standard dotted form. Four octets, each 0 to 255, no leading zeros. Spaces are trimmed. Invalid input shows an error and no result. The input length is limited so very long strings are rejected. For related processing needs, looking up IP addresses handles a complementary task.
Choose the mapping mode that matches your use. IPv4-mapped is common in software. 6to4 is legacy and often unreliable. NAT64 is used when you have a NAT64 gateway. Link-local is for local segment only. The tool’s note for each mode explains usability and limitations.
The tool does not show binary representation of the address. It shows the IPv6 in compressed and full hex form. If you need binary you can convert the hex elsewhere.
The AI analysis is optional and depends on a remote service. It can fail or return a generic message. The conversion result does not depend on the AI. You can use the tool fully without ever using the AI step.
Copy the form that your system expects. Some systems want the compressed form (::). Others want the full uncompressed form. The technical details section gives you both and copy buttons for each.
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Read full articleSummary: Convert IPv4 addresses to IPv6 format using various mapping methods (IPv4-mapped, IPv4-compatible, 6to4 addressing), shows binary representations, displays both formats side-by-side, supports CIDR notation for networks, and explains tunneling mechanisms.