iodine ☆

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Description:
Tunnel IPv4 traffic through a DNS server

Type: Formula | Tracked Since: Dec 28, 2025

Links: Homepage | formulae.brew.sh

Category: Networking

Tags: tunneling networking dns ipv4 firewall

Install: brew install iodine

About:
Iodine is a tool that encapsulates IPv4 traffic within DNS queries, allowing users to establish a network tunnel through a DNS server. It is particularly useful in environments with restrictive firewalls that block standard internet traffic but permit DNS requests. This enables a basic, albeit slow, connection to the outside world.

Key Features:

Tunnels IPv4 traffic over DNS protocol
Bypasses restrictive firewalls and content filters
Includes IPv6 support via the 'iodine6' variant
Works on Linux, macOS, BSD, and Windows

Use Cases:

Accessing the internet from networks with strict outbound firewall rules
Establishing a low-bandwidth connection in captive portal environments
Circumventing censorship on restricted networks

Alternatives:

dnscat2 – Focuses more on command and control (C2) or a shell, whereas Iodine aims to create a full IP tunnel.
ssh – Requires port 22 to be open, while Iodine works over standard DNS traffic.

Version History

Detected	Version	Rev	Change	Commit
Sep 14, 2024 9:19am		0	VERSION_BUMP	afbf033c
Nov 20, 2022 7:27pm		0	VERSION_BUMP	06bc765d