# cunnie/sslip.io

Golang-based DNS server which maps DNS records with embedded IP addresses to those addresses.

Repository: https://github.com/cunnie/sslip.io
Canonical: https://ross.abutalabs.com/products/sslipio
Language: Go
License: Apache-2.0
License Family: permissive
Topics: dns-server
Last push: 2026-08-25T10:13:48+00:00

## Health v2 (maintenance only)
Score: 96/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 99, release rhythm 91, longevity 100
- inputs: {"age_days": 4025, "days_push": 8, "days_rel": 61, "gap_med": 11, "n_releases_24m": 24}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1122, forks 106 (observed 2026-08-28T04:03:40.023691+00:00)

## What it is
sslip.io is a Go-based DNS server that maps specially-crafted hostnames with embedded IP addresses (e.g. 127-0-0-1.sslip.io) to those IP addresses. It can be used as a public service or self-hosted on your own nameservers, including in air-gapped environments.

## Use cases
- resolve hostnames with embedded ip addresses to those ips
- run a wildcard dns server for local development
- test webhooks without owning a domain
- serve sslip.io-style lookups on a custom subdomain
- run dns in an air-gapped environment
- self-host a nameserver with docker

## When to choose
- you need wildcard DNS mapping IPs to hostnames without registering domains
- you want a lightweight, self-hosted alternative to xip.io/nip.io
- you need DNS resolution in air-gapped or isolated networks

## When to avoid
- you need a general-purpose recursive DNS resolver
- you need full DNS zone management with record types beyond A/AAAA/NS/TXT basics

## Facets
- artifact type: service
- maturity: active
- function: networking, self-hosted
- domain: networking, web-development, developer-tools, self-hosted
- platform: go, cross-platform
- tags: dns-server, wildcard-dns, xip-io-alternative, ip-to-hostname, nameserver, linux, macos, docker

## Member repositories
- cunnie/sslip.io (main) score 96

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:03:40.023691+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T06:40:55.330408+00:00, confidence not recorded.
  - readme: https://github.com/cunnie/sslip.io (fetched 2026-08-28T04:03:40.023691+00:00, sha c598be3a64b8)
- Data as of 2026-08-30T08:39:29.467469+00:00.