Characters allowed after hostname but don't change the hostname

⚠ Browser differences

Checks what characters can be added at the end of "https://example.com", while keeping the hostname "example.com"

Fuzzer

Created Apr 15, 2024

Updated May 28, 2025

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CategoryURL Handling

VisibilityPublic

TypeJS

CharsetUTF-8

Template used:

if (new URL("https://example.com" + String.fromCodePoint($[i])).hostname === 'example.com'){log($[i])}

Sample payloads

if (new URL("https://example.com" + String.fromCodePoint(0)).hostname === 'example.com'){alert(0)}

if (new URL("https://example.com" + String.fromCodePoint(1)).hostname === 'example.com'){alert(1)}

if (new URL("https://example.com" + String.fromCodePoint(2)).hostname === 'example.com'){alert(2)}

if (new URL("https://example.com" + String.fromCodePoint(3)).hostname === 'example.com'){alert(3)}

if (new URL("https://example.com" + String.fromCodePoint(4)).hostname === 'example.com'){alert(4)}

if (new URL("https://example.com" + String.fromCodePoint(5)).hostname === 'example.com'){alert(5)}

if (new URL("https://example.com" + String.fromCodePoint(6)).hostname === 'example.com'){alert(6)}

if (new URL("https://example.com" + String.fromCodePoint(7)).hostname === 'example.com'){alert(7)}

if (new URL("https://example.com" + String.fromCodePoint(8)).hostname === 'example.com'){alert(8)}

if (new URL("https://example.com" + String.fromCodePoint(9)).hostname === 'example.com'){alert(9)}

if (new URL("https://example.com" + String.fromCodePoint(10)).hostname === 'example.com'){alert(10)}

if (new URL("https://example.com" + String.fromCodePoint(11)).hostname === 'example.com'){alert(11)}

if (new URL("https://example.com" + String.fromCodePoint(12)).hostname === 'example.com'){alert(12)}

if (new URL("https://example.com" + String.fromCodePoint(13)).hostname === 'example.com'){alert(13)}

if (new URL("https://example.com" + String.fromCodePoint(14)).hostname === 'example.com'){alert(14)}

if (new URL("https://example.com" + String.fromCodePoint(15)).hostname === 'example.com'){alert(15)}

if (new URL("https://example.com" + String.fromCodePoint(16)).hostname === 'example.com'){alert(16)}

if (new URL("https://example.com" + String.fromCodePoint(17)).hostname === 'example.com'){alert(17)}

if (new URL("https://example.com" + String.fromCodePoint(18)).hostname === 'example.com'){alert(18)}

if (new URL("https://example.com" + String.fromCodePoint(19)).hostname === 'example.com'){alert(19)}