This challenge need DNS rebinding to bypass IP blacklist.
DNS rebinding tool: [https://lock.cmpxchg8b.com/rebinder.html](http://)
Payload: [http://01010101.7f000001.rbndr.us/admin-status](http://)
> Flag: TWCTF{17_15_h4rd_70_55rf_m17164710n_47_4pp_l4y3r:(} 