IPv4 to IPv6 Converter

How it works

1. 1

   Enter the IPv4 address

   Type a dotted-quad address such as 192.0.2.5 into the field.

2. 2

   Read the IPv6 forms

   See the IPv4-mapped, IPv4-compatible and 6to4 representations side by side.

3. 3

   Copy the form you need

   Each result has a copy button, in both the short and full notation.

Frequently asked questions

What is an IPv4-mapped IPv6 address?

It is the form ::ffff:a.b.c.d, where the last 32 bits hold the IPv4 address and the prefix is ::ffff:0:0/96. A dual-stack host uses it so a single IPv6 socket can also talk to IPv4 peers. For 192.0.2.5 the mapped address is ::ffff:192.0.2.5, which in pure hex is ::ffff:c000:205.

What is the difference between IPv4-mapped and IPv4-compatible?

Both put the IPv4 address in the low 32 bits, but the compatible form (::a.b.c.d, prefix ::/96) has all-zero upper bits, while the mapped form sets the 16 bits before the address to ffff. The compatible form is deprecated and shown only for reference; the mapped form is what current systems use.

What is a 6to4 address?

A 6to4 address embeds an IPv4 address into the 2002::/16 prefix, giving the IPv4 host an entire IPv6 /48 to use over a 6to4 tunnel. For 192.0.2.5 the 6to4 prefix is 2002:c000:205::, since c000:0205 is 192.0.2.5 in hex.

Does this conversion run on a server?

No. The address is converted entirely in your browser, so the IPv4 address you enter is never sent anywhere. It keeps working once the page has loaded, even offline.