Every DNS check.
One search.
Records, health report, global propagation, WHOIS, SSL, security headers, SPF/DKIM/DMARC, ping and traceroute — a full diagnosis of any domain in seconds.
- Tools in one place
- 10
- Tools in one place
- Global DNS resolvers
- 18
- Global DNS resolvers
- Ping & traceroute
- Live
- Ping & traceroute
- Free, no account
- $0
- Free, no account
Pick a tool, or run them all
Overview runs every check at once. Each tool also works on its own.
Built for people who run websites
From a quick lookup to a full pre-launch audit.
Straight from the source
DNS Health walks the delegation from the parent zone and queries every authoritative name server directly — no cached answers hiding problems.
Fast & live
Checks run in parallel and ping / traceroute stream line by line from our Amsterdam probe, so you see results as they happen.
Security built in
Grade your HTTP security headers, verify the SSL chain and expiry, and audit SPF, DKIM and DMARC before mail starts bouncing.
Shareable results
Every report has its own URL. Send it to a client, your host or your team — they see exactly what you see.
Frequently asked questions
What does the DNS Health check test?
It finds the parent zone, compares the delegation (NS and glue records) with what your name servers publish, then asks each name server directly. It checks that they are authoritative, reachable over UDP and TCP, not open resolvers, agree on the SOA serial, and reports on SOA timers, MX, WWW and DNSSEC.
How long does DNS propagation take?
A change is visible once cached answers expire, which depends on the record's TTL — usually minutes to a few hours, and up to 48 hours for NS changes at the registry. The propagation tool shows what 18 public resolvers around the world return right now.
Why do some resolvers return different IP addresses?
Sites behind a CDN or geo-DNS hand out different addresses depending on where the question comes from. That is normal; set an expected value to check whether a specific record has reached every resolver.
Is DNSolog free?
Yes. Every tool is free to use without an account. Light rate limits keep the service fast for everyone.
Where do ping and traceroute run from?
From our server in Amsterdam, the Netherlands. Results show latency and the network path from there to your target.
Check your domain now
Catch DNS, SSL and email problems before your visitors do.