It is bound to all interfaces as of the current commit: https://github.com/devtools-html/debugger.html/blob/7c002fdc69a6b54a04b5a292f2cb782ddf51fe58/bin/develop

It is bound to all interfaces as of the current commit: https://github.com/devtools-html/debugger.html/blob/7c002fdc69a6b54a04b5a292f2cb782ddf51fe58/bin/development-server.js#L86 https://github.com/devtools-html/debugger.html/blob/7c002fdc... Generally the sanest default for that value is 127.0.0.1 and changeable via a cli option.