AndIodine

AndIodine is an Android application that routes data traffic through DNS tunneling. It works by encoding arbitrary data inside DNS query and response packets, allowing a device to maintain a network connection in environments where standard TCP/IP traffic is blocked but DNS lookups are permitted — such as captive portals at hotels, airports, or public Wi-Fi hotspots.

The app acts as a client for an iodine-compatible server, which must be set up separately on a remote host with a registered domain. Once connected, the device receives a virtual IP address and can tunnel IP traffic through the DNS channel. Because DNS is not designed for bulk data transfer, throughput is limited and latency is noticeably higher than a direct connection. The approach is functional for light tasks but not suited for high-bandwidth use.