IPv4 to IPv6 Calculator
Enter an IPv4 address and choose conversion details. Results appear above this form after submission.
Example Data Table
| IPv4 Address | Prefix | Mapped IPv6 | 6to4 Address | NAT64 Address |
|---|---|---|---|---|
| 192.0.2.45 | /24 | ::ffff:192.0.2.45 | 2002:c000:022d:: | 64:ff9b::c000:022d |
| 198.51.100.10 | /26 | ::ffff:198.51.100.10 | 2002:c633:640a:: | 64:ff9b::c633:640a |
| 203.0.113.77 | /28 | ::ffff:203.0.113.77 | 2002:cb00:714d:: | 64:ff9b::cb00:714d |
Formula Used
IPv4-mapped IPv6: ::ffff:a.b.c.d
IPv4-compatible IPv6: ::a.b.c.d
6to4 format: convert each IPv4 octet into two hexadecimal digits. Then use 2002:HHHH:HHHH::.
NAT64 format: place the hexadecimal IPv4 value after a /96 prefix. The common prefix is 64:ff9b::/96.
Subnet mask: set prefix bits to one. Set remaining bits to zero. Convert each 8-bit group to decimal.
Network address: apply a bitwise AND between the IPv4 integer and subnet mask.
Broadcast address: combine the network address with inverted host bits.
How to Use This Calculator
- Enter a valid IPv4 address, such as
192.0.2.45. - Add the IPv4 prefix length from 0 to 32.
- Select the conversion mode you want to review.
- Enter a custom /96 IPv6 prefix when needed.
- Click the calculate button.
- Review mapped, compatible, 6to4, NAT64, subnet, hex, and binary results.
- Use the CSV or PDF button to save your report.
IPv4 to IPv6 Conversion Guide
Why Conversion Matters
IPv4 addresses remain common in many networks. Yet IPv6 is now needed for scale, routing, and modern connectivity. A conversion calculator helps teams understand how an IPv4 value appears inside IPv6 transition formats. This is useful during migration planning, lab testing, firewall review, and documentation work.
Mapped Addresses
An IPv4-mapped IPv6 address places the IPv4 value after the ::ffff: marker.
This format is often used by software stacks that handle IPv4 traffic through IPv6-aware interfaces.
It does not create native IPv6 routing by itself. It mainly represents an IPv4 endpoint in IPv6 notation.
6to4 Addresses
A 6to4 address starts with 2002. The IPv4 address is converted into hexadecimal and inserted after that prefix.
For example, 192.0.2.45 becomes c000:022d. The resulting form is useful for learning how transition addressing works.
NAT64 Addresses
NAT64 uses a /96 IPv6 prefix and appends the IPv4 address as hexadecimal.
The well-known prefix is 64:ff9b::/96. Some networks use custom prefixes.
This calculator supports both common and custom /96 styles.
Subnet Review
The tool also checks IPv4 subnet details. It shows the mask, wildcard mask, network address, broadcast address, and total address count. These values help compare old addressing plans with new transition records. The chart shows each IPv4 octet. This makes the decimal structure easier to inspect.
Export Options
CSV export is useful for spreadsheets and audit logs. PDF export is useful for reports and tickets. Always validate results before applying them to production routing, access lists, or migration documents.
Frequently Asked Questions
1. What does this calculator convert?
It converts an IPv4 address into several IPv6 transition formats, including mapped, compatible, 6to4, NAT64, and custom /96 output.
2. Is an IPv4-mapped address a real IPv6 address?
It is an IPv6 notation used to represent IPv4 addresses. It does not automatically provide native IPv6 routing or connectivity.
3. What is the 6to4 format?
6to4 converts the IPv4 address into hexadecimal and places it after the 2002 prefix. It is mainly used for transition concepts.
4. What is NAT64 output?
NAT64 output appends the hexadecimal IPv4 address to a /96 IPv6 prefix. The common prefix is 64:ff9b::/96.
5. Can I use a custom IPv6 prefix?
Yes. Enter your custom /96 prefix in the custom prefix field. The calculator appends the IPv4 hexadecimal value.
6. Why does the calculator show subnet data?
Subnet data helps review the original IPv4 network range. It supports migration records, audits, and address planning.
7. What is the binary IPv4 value for?
Binary output helps users inspect each IPv4 octet at bit level. It is useful for subnet training and troubleshooting.
8. Can I export the results?
Yes. Use the CSV button for spreadsheet data. Use the PDF button for a clean conversion report.