CaptainDNS · May 19, 2026
100% free · no sign-up requiredPaste anything DNS or email.
Paste anything DNS or email.
Get a full audit in seconds.
Domain, IP, email, URL or raw DNS record. We detect the input and run the right audit in under 3 seconds.
Hosted services
Continuous monitoring and policy hosting
For the parts of your stack that need uptime, alerts and a real owner, not a one-off check.
DMARC Monitoring
Real-time rua/ruf reports, sender breakdowns and alerts when alignment breaks.
Live · 4 senders detected
Learn moreHTTP monitors
Multi-region uptime checks, consensus across 3 regions, status and alerts.
EUUSAPAC
Learn moreNewStatus pages
Public status pages tied to your monitors. Custom domain, incidents, subscribers, RSS.
All systems operational
Learn moreNewDomain Redirect
Host 301/302 redirects with HTTPS and per-link analytics. No server to maintain.
acme.com/promo → acme.io · 301
Learn morePricing
Simple pricing, no surprises
All audit tools stay free. Pay only for monitoring, hosting or higher API limits.
Free
For occasional audits and one-off checks.
€0€0 forever
- 60+ tools, unlimited audits
- 1 DNS watch
- 1 HTTP monitor
- Community support
Starter
For solo developers securing their own domains.
€29€23 /month
- Everything in Free
- 10 DNS watches
- 1 hosted service
- Email alerts · 50k API credits
- 48h email support
Most popular
Pro
For businesses securing multiple domains in production.
€99€79 /month
- Everything in Starter
- 50 DNS watches · 25 monitors
- 3 hosted services
- DMARC up to 250k msgs/day
- 500k API credits · 24h support
Business
For agencies and MSPs handling many client domains.
€199€159 /month
- Everything in Pro
- 200 monitors · unlimited watches
- 10 hosted services
- Slack/PagerDuty · SSO
- 2M API credits · 8h support SLA
Enterprise
Custom · 99.99% SLA · SAML · audit logs · dedicated infra
Unlimited everything, custom contracts, named support.
All paid plans include a 14-day free trial. No credit card required. Cancel anytime.
Compare all features60+ Tools
60+ tools, grouped by job to be done
Pick a category. Each tool ships with a live output preview.
Blog
Latest from the blog
Deep dives on DMARC, DNSSEC, deliverability and modern email security.
CaptainDNS · May 19, 2026
CaptainDNS · May 18, 2026
DORA, NIS2 and status pages: turning incident communication into EU compliance evidence
In 2026, the status page is no longer a marketing tool. It is an admissible audit artifact for DORA, NIS2 and GDPR. A complete operational guide.
FAQ
Frequently asked questions
Everything you wanted to know before signing up.
Is the free plan really free?
All 60+ audit tools are free forever with no sign-up. Paid plans only apply for monitoring, hosted services or higher API limits.
Can I change plans anytime?
Yes, you can upgrade or downgrade at any time. The change takes effect immediately, with prorated billing handled by Paddle.
Do you store the domains I audit?
Audits run on the fly and are not persisted unless you save them in your account. We keep aggregate counters only, no PII, no third-party trackers.
How does annual billing work?
You are billed 12 months upfront with a 20% discount versus the monthly rate. Cancel anytime, unused months are refunded prorata.
What happens if I exceed my API limits?
Calls succeed up to a soft overage cap (billed as one-time charges via Paddle), then return 429. You can disable overage in your plan settings. Existing resources stay active.
What payment methods do you accept?
Credit card (Visa, Mastercard, Amex), PayPal, Apple Pay and Google Pay via our billing partner Paddle. Enterprise contracts support wire transfer and SEPA.
How does DMARC reporting work?
We parse rua and ruf reports in real time, deduplicate senders, expose failures with actionable signals and alert you when alignment breaks. EU hosting, no resale.
Do you support SSO?
Yes on Business and Enterprise. Okta, Google Workspace and Azure AD are supported out of the box; custom SAML on Enterprise. SCIM provisioning available on request.
By the numbers
- Domains audited this month
- 1.5M+
- DNS queries this month
- 2.3M+
- Resolvers across continents
- 18
- API uptime · last 12 mo
- 99.99%
18 resolvers, 4 continents