What is a bulk DNS lookup tool?
A bulk DNS lookup tool resolves the records that tell the internet where a domain lives and how it behaves, for many domains in a single pass. When you open a website, send email or connect to an API, your device asks the Domain Name System for these records. This batch DNS lookup fetches A, AAAA, MX, TXT, CNAME, NS and SOA records for every domain on your list, so you can see whether a set of sites points at the right servers, routes mail correctly and carries the records that power email authentication.
The record types at a glance
A and AAAA map the domain to IPv4 and IPv6 addresses; MX points at mail servers; NS lists the authoritative nameservers; TXT carries verification and authentication strings; CNAME creates aliases; and SOA marks the start of authority for the zone.
Why run a bulk DNS checker
Moving a site, debugging downtime or verifying mail configuration? A bulk DNS checker lets you do a DNS lookup on multiple domains at once and compare their records side by side, making it fast to confirm that changes have propagated or that a suspicious set of domains resolves somewhere unexpected.
A built-in bulk MX record checker
Mail routing is one of the most common reasons to inspect DNS. The MX records show which servers accept mail for each domain, so the tool doubles as a bulk MX record checker, ideal for spotting misconfigured mail servers across a fleet of domains.
Frequently asked questions
What DNS record types are checked?
A, AAAA, CNAME, MX, NS, TXT and SOA, the standard set used to route web traffic and mail.
Can I do a DNS lookup on multiple domains at once?
Yes. Paste up to 25 domains and every record type is fetched for each one in a single pass.
Where do I configure and manage my domain's DNS records?
DNS records are configured at your active DNS hosting provider based on your nameservers: your Domain Registrar (by default), your Web Hosting control panel (if nameservers point to your host), or a Third-Party DNS Manager like Cloudflare if connected.
What does a missing NS (Name Server) record mean and how do I fix it?
A missing NS record means your domain has no active DNS provider connected to it. Without nameservers, your website and email will not resolve. To fix this, update your domain registrar settings so your nameservers point to your web host or a DNS provider like Cloudflare.
What happens if my domain is missing a DMARC record?
Without a DMARC record, your domain lacks email authentication policies, making it vulnerable to domain spoofing and phishing. Major email providers like Gmail and Yahoo may deliver your messages to spam. You can fix this by adding a TXT record for _dmarc with a value like v=DMARC1; p=none;.
Is a missing AAAA record a critical issue for a website?
No. A missing AAAA record only means your domain has no IPv6 address configured. Standard IPv4 A records are sufficient to keep your website accessible. If your host provides an IPv6 address, you can add it as a AAAA record; otherwise, it can be left empty.
Why does a domain have no DNS records?
The domain may not be configured for that record type, or its nameservers were unreachable at the time of the lookup.
How does DNS propagation affect results?
DNS changes spread gradually across providers. A lookup reflects the live, current answer, which may briefly differ from the intended configuration during propagation.