Characters allowed within a hostname but don't change the hostname

Checks what characters can be added in the middle of "example.com", while keeping the hostname "example.com"

Fuzzer

Created Apr 30, 2024

Updated Sep 5, 2026

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CategoryURL Handling

VisibilityPublic

TypeJS

CharsetUTF-8

Template used:

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

Sample payloads

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

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

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

if (new URL("https://example.co" + String.fromCodePoint(173) + "m").hostname === 'example.com'){alert(173)}

if (new URL("https://example.co" + String.fromCodePoint(847) + "m").hostname === 'example.com'){alert(847)}

if (new URL("https://example.co" + String.fromCodePoint(4447) + "m").hostname === 'example.com'){alert(4447)}

if (new URL("https://example.co" + String.fromCodePoint(4448) + "m").hostname === 'example.com'){alert(4448)}

if (new URL("https://example.co" + String.fromCodePoint(6068) + "m").hostname === 'example.com'){alert(6068)}

if (new URL("https://example.co" + String.fromCodePoint(6069) + "m").hostname === 'example.com'){alert(6069)}

if (new URL("https://example.co" + String.fromCodePoint(6155) + "m").hostname === 'example.com'){alert(6155)}

if (new URL("https://example.co" + String.fromCodePoint(6156) + "m").hostname === 'example.com'){alert(6156)}

if (new URL("https://example.co" + String.fromCodePoint(6157) + "m").hostname === 'example.com'){alert(6157)}

if (new URL("https://example.co" + String.fromCodePoint(6158) + "m").hostname === 'example.com'){alert(6158)}

if (new URL("https://example.co" + String.fromCodePoint(6159) + "m").hostname === 'example.com'){alert(6159)}

if (new URL("https://example.co" + String.fromCodePoint(8203) + "m").hostname === 'example.com'){alert(8203)}

if (new URL("https://example.co" + String.fromCodePoint(8288) + "m").hostname === 'example.com'){alert(8288)}

if (new URL("https://example.co" + String.fromCodePoint(8289) + "m").hostname === 'example.com'){alert(8289)}

if (new URL("https://example.co" + String.fromCodePoint(8290) + "m").hostname === 'example.com'){alert(8290)}

if (new URL("https://example.co" + String.fromCodePoint(8291) + "m").hostname === 'example.com'){alert(8291)}

if (new URL("https://example.co" + String.fromCodePoint(8292) + "m").hostname === 'example.com'){alert(8292)}