DNS Lookup, SPF & DKIM Generator
Look up DNS records over DNS-over-HTTPS, build an SPF record, count its DNS lookups, and generate a DKIM key pair, all from your browser.
Look up A, AAAA, MX, TXT, NS, CNAME, SOA, CAA, SRV and PTR records through Cloudflare or Google’s DNS-over-HTTPS resolver. Build an SPF record by picking the services that send mail for your domain, load the one you already publish, and count the DNS lookups it costs a receiving server (the limit is 10). Generate a DKIM key pair, get the TXT record to publish, and check what is live in DNS for a selector, including whether it matches the key you generated.
There is no server behind this page. Lookups go straight from your browser to the resolver you choose, so that resolver sees the names you query. Keys are generated with your browser’s Web Crypto API and the private key never leaves the page.
Name
Try _dmarc.gmail.com for DMARC or selector._domainkey.example.com for a DKIM key.
Records
Domain (optional)
Senders
IP addresses
Other terms, kept as they are:
SPF record
Checks
Selector
Domain
Published record
DNS record
Private key
Give this to your mail server or provider and keep it secret. It is not stored anywhere.