Check MX, SPF, DMARC, DKIM, A, NS records for hundreds of domains. Validate emails and detect providers like Gmail, Yahoo & Outlook. Export to CSV instantly.
All free — no login needed — up to 500 domains per check
Everything you need to audit DNS and email records at scale
A bulk DNS checker is a tool that lets you look up DNS records for dozens or hundreds of domains simultaneously. Instead of checking them one by one in a terminal or online tool, you paste or upload your list and get instant results — saving hours of manual work for sysadmins, email marketers, and developers.
Our tool supports all major DNS record types: MX (mail servers), SPF (sender policy), DMARC (email policy), DKIM (signing keys), A (IPv4), AAAA (IPv6), NS (nameservers), CNAME (aliases), TXT (text records), SOA (zone authority), and PTR (reverse DNS).
The Email MX Checker is our newest tool. Upload or paste a list of email addresses and it will validate the format of each one, look up MX records for each unique domain, and automatically classify the email provider — Gmail, Yahoo, Outlook, ProtonMail, Zoho, Amazon SES and more. You get a full provider breakdown chart and can download the results as a CSV file.
This is ideal for email marketers who want to understand their list composition, developers validating sign-up forms, and anyone cleaning bulk email lists before a campaign.
.csv / .txt fileYes — completely free. No account, no credit card, no hidden limits. Up to 500 domains or emails per request.
Up to 500 domains or emails per request. Duplicates are automatically removed.
No — it checks format validity and MX DNS records. SMTP-level mailbox verification is blocked by most mail servers.
Yes — upload any .csv or .txt file. Comma, semicolon or newline separated lists all work.
They protect your domain from email spoofing. Missing SPF/DMARC means your emails may land in spam or attackers can impersonate your domain.