27 free tools
DNS
Read what a domain is really publishing, and build the records a provider asks for.
The tools
Free DNS tools: look up any record type across two resolvers, and generate the exact records Google Workspace, Microsoft 365, Shopify or GitHub Pages ask you to paste.
MX lookup
See where a domain receives mail, in priority order, with the faults that stop it.
Live checkDNS lookup
Query any DNS record type from two resolvers at once, so a change still spreading is easy to spot.
Live checkDNS propagation checker
See whether a DNS change has reached two independent public resolvers yet, with their TTLs.
Live checkNameserver and DNS host checker
See who hosts a domain’s DNS from its nameservers, and whether the registry’s own list still matches what the zone answers.
Live checkDNS record type explainer
Nine DNS record types explained in plain words, each with a worked example - and, add a domain, the chosen type looked up live through two resolvers.
Live checkDNS change verifier
Get a plain pass or fail on whether the value you just set has actually taken effect.
Live checkCNAME chain follower
Follow a CNAME chain hop by hop to its final address, and catch a loop or a dead end before anything fetches it.
Live checkCAA record checker
Read which certificate authorities a domain allows, and see whether the one you actually use is among them.
Live checkCAA record generator
Build a CAA record that names exactly the certificate authorities allowed to issue for a domain, wildcards and all.
In your browserApex CNAME checker
See whether a name is really its own zone apex, and whether a CNAME sitting there is legal or just flattened.
Live checkSOA record checker
Read a zone’s SOA record as seven plain-English timers, and catch a serial or a refresh that will cause real trouble.
Live checkDNSSEC chain checker
See whether a domain publishes a DS record that actually matches its own DNSKEY, recomputed by hand rather than taken on trust.
Live checkZone file checker
Paste a BIND-style zone file, or point this at a live domain, to catch a CNAME sharing a name it should not and an SOA whose timers are ordered wrong.
Live checkTTL migration planner
When to drop a TTL before a DNS cutover, and the first moment the old value is actually gone.
In your browserSubdomain takeover checker
Follow a subdomain's CNAME to its target and say whether that target looks abandoned enough for someone else to claim.
Live checkIP-to-ASN and network lookup
Look up which autonomous system and network an IP address belongs to, and who that network is registered to.
Live checkSRV record generator & checker
Build a correctly shaped SRV record for SIP or Microsoft Teams, then check the live one against it for exactly what a registrar panel tends to mangle.
Live checkDNS health report
See DNSSEC, CAA and the nameservers for one domain together, with the fixes in the order to do them.
Live checkZoho Mail DNS record generator
Get the three MX records and the SPF include Zoho Mail needs, ready to paste into any DNS panel.
In your browserFastmail DNS record generator
Get every DNS record a Fastmail custom domain needs - MX, SPF and all three DKIM CNAMEs - with nothing left as a placeholder.
In your browserGoogle Workspace DNS record generator
Get the one MX record and SPF include Google Workspace documents, and a plain answer about the old "aspmx" records.
In your browserMicrosoft 365 DNS record generator
Get the handful of DNS records Microsoft 365 documents as fixed for every tenant, and a plain list of the ones only your own admin center can give you.
In your browserShopify DNS record generator
Get the apex A record, the AAAA record and the www CNAME Shopify asks for, with its own one-record-only rule flagged before you publish.
In your browserGitHub Pages DNS record generator
Get the four fixed apex A records, the optional IPv6 set and the www CNAME GitHub Pages needs, with your own user or organisation name built in.
In your browserSquarespace DNS record generator
Get the four apex A records and the www CNAME Squarespace needs for a custom domain, ready to paste into any DNS panel.
In your browserNetlify DNS record generator
Get Netlify's apex record - ALIAS, ANAME or the fallback A - plus a www CNAME completed with your own Netlify subdomain.
In your browserTXT record splitter
Split a long TXT record value into properly quoted 255-byte character-strings, or the one value a panel that auto-joins would want.
In your browser
More free tools
Every other family, and what it checks.
Email authentication
Check and build the SPF, DKIM and DMARC records that decide whether mail arrives.
22 toolsDomains
See whether a name is free, who holds it, and what the registry says about it.
12 toolsDeliverability
Meet the rules the big mailbox providers set before they start rejecting your mail.
14 toolsFor developers
Try a webhook, a key or an API call without writing a script to do it first.
10 toolsMessaging
Work out what a text message really costs to send.
10 toolsPricing and billing
Work out what to charge, what it leaves you, and what a change mid-cycle costs.
17 tools
Start selling under your own brand
- Sign up with an email, no call needed1 minute
- Get test keys and $5,000 of pretend moneyInstantly
- Take order #0001 under your own nameToday