Characters allowed at IPv6 but don't change the hostname

⚠ Browser differences

Checks what characters can be used as valid IPv6 hostname

Created byd0ge

Created Jun 10, 2024

Updated May 27, 2025

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CategoryURL Handling

VisibilityPublic

TypeJS

CharsetUTF-8

Template used:

if (new URL("https://" + String.fromCodePoint($[i]) + "::ffff:7f00:1]/").hostname === '[::ffff:7f00:1]'){log($[i])}

Sample payloads

if (new URL("https://" + String.fromCodePoint(91) + "::ffff:7f00:1]/").hostname === '[::ffff:7f00:1]'){alert(91)}

if (new URL("https://" + String.fromCodePoint(65095) + "::ffff:7f00:1]/").hostname === '[::ffff:7f00:1]'){alert(65095)}

if (new URL("https://" + String.fromCodePoint(65339) + "::ffff:7f00:1]/").hostname === '[::ffff:7f00:1]'){alert(65339)}