Free tools to check DNS propagation, email authentication, SSL certificates, blacklists, and more. No account needed.
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What Fred can check
Paste a domain or IP and Fred will run the test instantly — no login, no rate limits, no nonsense.
Check if your DNS changes have propagated across global resolvers including Google, Cloudflare, Quad9, and OpenDNS.
Validate your email authentication records. See your policy, score your configuration, and get actionable recommendations.
Check your IP or domain against 40+ major email blacklists including Spamhaus, SpamCop, Barracuda, and SORBS.
Inspect any SSL/TLS certificate. See the issuer, expiry date, SANs, key algorithm, and get an overall grade.
Look up domain registration details — registrar, creation date, expiry, nameservers, and registrant info.
Find the mail servers for any domain with priority order. Identify your email provider and spot misconfigurations.
Look up the PTR record for any IP address. Essential for mail server deliverability — matching FCrDNS is required by many receivers.
Query A, AAAA, MX, TXT, CNAME, NS, SOA and more record types from multiple resolvers simultaneously.
Fred queries live DNS servers in real-time. No cached results, no delays.
Just enter a domain and go. Fred doesn't store your queries or require sign-up.
Propagation checks use Google, Cloudflare, Quad9 and more to show global status.
Fred doesn't just show raw records — he scores your config and tells you what to fix.
Learn
DMARC stops spammers from impersonating your domain. Here's how it works and how to set it up step by step.
DeliverabilityIf your emails are landing in spam, you may be on an RBL. Here's how to check and how to get delisted.
DNSChanged your nameservers or A record and nothing happened? TTL and caching explain the delay — and how to speed it up.