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sslip.io

Domains 4.0/10

Free public wildcard DNS that resolves any hostname with an embedded IP address straight to that IP, no signup required.

Card required
No

sslip.io scores 4/10 for free value in Domains. The main constraint: Unlimited resolution of any IPv4/IPv6-embedded hostname (e.g. 192-168-0-1.sslip.io) at no cost, with no account and no card; optional self-hosted branded subdomains via NS delegation.

Category Domains Kind Wildcard DNS service Caveats Best-effort community service with no SLA or guarantees (the companion nip.io domain has been flagged as at risk of disappearing); nameservers are non-recursive and only resolve IP-embedded hostnames; an abuse blocklist and takedown system can block specific hostnames; shared Let's Encrypt certificate rate limits apply across all users of the domain. Card required No Eligibility anyone

Free value score

4.0 / 10
Show the math
Overall 4/10
value = 4/100
weighted_components_v1
Name/DNS value 1/10
value = 0.01 $/yr
fixed_log_v1
API/DDNS fit 5.5/10
value = 5.5/100
policy_score_v1
Trust and friction 9/10
value = 9/100
policy_score_v1

Key metrics

∞ Free domains
Auto DNS records A/AAAA/TXT/MX/NS/PTR
0 min DDNS refresh derived
Yes Ad-free

What you get

No signup, no card, no config — any IP-embedded hostname resolves instantly

Supports IPv4 and IPv6, with dot or dash separators

Issue valid Let's Encrypt / ZeroSSL TLS certs per hostname (HTTP-01) or wildcard (DNS-01)

Brand your own subdomain via NS delegation, or self-host the open-source Go DNS server

Gotchas

  • Embedded-IP hostnames only

    Nameservers are non-recursive and only resolve hostnames that embed a valid IPv4/IPv6 address (plus a few status/TXT records); they will not resolve arbitrary domains and must never be set as a machine's general resolver.

  • No managed custom DNS records

    A/AAAA records are derived automatically from the hostname; MX/SOA/PTR are hard-coded and there are no SRV records. You cannot create or manage arbitrary record values without self-hosting your own delegated nameservers.

  • Shared TLS certificate rate limits

    TLS certificates are issued by external CAs (Let's Encrypt/ZeroSSL) against the shared sslip.io/nip.io domain, so CA per-domain rate limits are pooled across all users; if one domain is rate-limited you must switch to the other (sslip.io <-> nip.io).

  • Abuse blocklist and takedowns

    An automated blocklist filters phishing/abuse strings and CIDRs, and hostnames named in takedown notices return a 'site blocked' warning record instead of the embedded IP.

  • Best-effort, no SLA

    Free volunteer-run service (~10k queries/sec across a handful of nameservers) with no uptime guarantee; community reports warn the sibling nip.io domain could disappear, so production reliance is risky.

  • Experimental features unstable

    Helper features such as external-IP TXT lookup (ip.nip.io) and version/metrics TXT records are explicitly experimental and may change or be removed.

Sources

dns wildcard-dns free no-signup ipv6 tls lets-encrypt self-hostable open-source kubernetes
Open service Source ← All Domains

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