IPv6 to IPv4
Extract IPv4 from a mapped IPv6 address.
An IPv4-mapped IPv6 address carries a real IPv4 address in its last 32 bits behind the ::ffff: prefix. This extracts that address, which is useful when server logs record IPv4 clients in mapped form.
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How IPv6 to IPv4 works
What it does
Extract IPv4 from a mapped IPv6 address.
What you get
The IPv4 address embedded in an IPv4-mapped IPv6 address.
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IPv6 to IPv4 — frequently asked questions
Can any IPv6 address be converted to IPv4?
No. Only addresses that embed one — mapped (::ffff:) and some transition formats. A native IPv6 address has no IPv4 equivalent.
Why do my logs show ::ffff: addresses?
A dual-stack socket listening on IPv6 reports IPv4 clients in mapped form. It is the same client, written the way the IPv6 socket sees it.
Should I store the mapped or the extracted form?
Store consistently. Normalising mapped addresses to plain IPv4 before writing them avoids the same client appearing as two different values.