The dns command resolves every common record type over DoH, with a --json mode for scripting.
# all common record types
python cli.py dnsgithub.com# only A, MX and TXT, as JSON
python cli.py dnsgithub.com--typesa,mx,txt--json
THE BIG DIFFERENCE
Run DNS lookups from inside your AI
This tool speaks the Model Context Protocol (MCP) and ships a REST API. Connect it once, then ask your assistant for a domain's mail servers, IPs or TXT records.
A DNS checker looks up the records that tell the internet where a domain points and how it behaves. This tool returns the common record types in one place, each with its TTL, using DNS-over-HTTPS so it works directly in your browser.
What each record type means
A / AAAA: the IPv4 and IPv6 addresses the domain resolves to.
CNAME: an alias pointing this name at another name.
MX: the mail servers that receive email for the domain, in priority order.
NS: the authoritative nameservers that answer for the domain.
TXT: free-form text records, commonly SPF, DKIM and domain verification.
SOA: the zone's start-of-authority record with its serial and timers.
CAA: which certificate authorities are allowed to issue certificates for the domain.
How to check DNS records
Enter the domain (for example github.com).
Toggle the record types you care about, or leave them all on.
Select Look up. Records appear grouped by type within a couple of seconds.
Copy any value, or use the CLI and API for scripting and AI assistants.
Frequently asked questions
What is a DNS checker?
A DNS checker looks up the DNS records that tell the internet where a domain points. This tool returns A and AAAA (IP addresses), CNAME (aliases), MX (mail servers), NS (nameservers), TXT (SPF, DKIM and verification), SOA and CAA records, each with its TTL, using DNS-over-HTTPS from Google and Cloudflare.
How do I check the MX records of a domain?
Enter the domain and the tool returns its MX records, sorted by priority, showing which mail servers receive email for that domain. It also shows TXT records such as SPF, useful for diagnosing email delivery.
Is the DNS checker free and open source?
Yes. It is completely free and open source under the MIT license, part of WebToolsHub by Konko Maji. It runs fully in your browser using DNS-over-HTTPS, so there is no signup and no data is stored.
What is DNS-over-HTTPS?
DNS-over-HTTPS (DoH) resolves DNS queries over an encrypted HTTPS connection instead of plain port-53 DNS. This tool uses the Google and Cloudflare DoH resolvers, which is why it works directly in the browser and from any host.
Can I run a DNS lookup inside Claude, ChatGPT or Gemini?
Yes. It ships an MCP server and a REST API, so you can connect it to Claude, ChatGPT, Gemini, Kimi, Cursor and any MCP client, then ask your assistant to look up a domain's DNS records for you. See the connection guide.