Sslip.Io

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sslip.io is an Open Source DevOps & Infrastructure tool that functions as a DNS server, mapping DNS A records with embedded IP addresses to those addresses. It's useful for development and testing environments.

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At a glance

Pricing

Open Source

Free tier

Yes

API

Skill level

Technical

About

What is sslip.io?

sslip.io is an open-source, Golang-based DNS server designed to map specially-crafted DNS A records directly to their embedded IP addresses. Similar to xip.io, it simplifies DNS resolution for development and testing, allowing users to resolve hostnames like "127-0-0-1.sslip.io" to "127.0.0.1". The tool can be run as a service or self-hosted via Docker, offering flexibility for various environments, including air-gapped setups. Key features include customizable nameservers and address records, blocklist support, and control over public address resolution, which enhances security for sensitive applications. It supports both IPv4 and IPv6 and binds to both UDP and TCP.

Best used for

Ideal for developers who need to simplify DNS resolution in development and testing environments, and for setting up custom DNS lookups. Especially valuable for creating dynamic DNS entries without manual configuration, and for use in air-gapped or isolated network setups.

Common actions

resolve IP addresses

configure DNS records

test network configurations

deploy DNS server

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Capabilities

Key features

Map DNS A records to IPs
Customizable nameservers
Customizable address records
Blocklist support
Control public address resolution
Docker deployment
IPv4 and IPv6 support

Target Audience

developer

Integrations

Not yet documented

Pricing & Plans

Open Source

Free

FAQs

How does sslip.io differ from xip.io?

sslip.io is a Golang-based DNS server that maps DNS A records with embedded IP addresses, similar to xip.io. It was inspired by xip.io but offers its own implementation and features, including customizable nameservers and address records, and the ability to run your own instance.

Can sslip.io be used in an air-gapped environment?

Yes, sslip.io can be particularly useful in internetless (air-gapped) environments. You can customize your nameserver and address records using the -nameservers and -addresses flags, allowing for self-contained DNS resolution without external dependencies.

Is sslip.io a general-purpose DNS server?

No, sslip.io is not a general-purpose or recursive DNS server. It is specifically designed to map DNS records with embedded IP addresses to those addresses. It will not resolve external domains like google.com, and should not be configured as a primary nameserver for general internet access.

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