Lookups
Master Lookup
Run DNS, WHOIS, CAA, geolocation, and more in one pass instead of checking each tool separately.
Detected –. Tools that don't apply to this are grayed out:
- Text (.txt)
- Spreadsheet (.csv)
Domain & IP Lookups
DNS lookup
Looks up the DNS records for any domain: A, AAAA, MX, NS, and TXT.
| Type | Value |
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Domain & IP Lookups
Is it down?
Checks if a site responds, straight from your browser.
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Domain & IP Lookups
Domain & IP registration lookup
Registrar, registration dates, and ownership info for a domain or IP.
Domain & IP Lookups
CAA record checker
Checks which Certificate Authorities can issue SSL certs for a domain.
| Tag | Authorized For | Flags |
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Domain & IP Lookups
IP geolocation lookup
Look up city, ISP, and timezone for any IP, not just yours.
Email Deliverability
Email security check
Checks if a domain has SPF and DMARC set up.
SPF
–Sender Policy Framework: lists which mail servers are allowed to send email for this domain.
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DMARC
–Tells receiving mail servers what to do with messages that fail SPF/DKIM checks.
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Email Deliverability
DKIM record checker
DKIM records use a provider-specific selector that isn't public. This tries common selectors, or checks one you give it.
| Selector | Record |
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Email Deliverability
Reverse DNS / PTR lookup
Checks an IP's PTR record, then confirms it points back to the same IP. A missing PTR record is a common reason legit email gets flagged as spam.
Email Deliverability
Blacklist check
Checks if an IP, domain, or mail server is flagged on spam blacklists.
Your Connection
Latency checker
Times a round trip from your browser to a few DNS resolvers. Test your own site below too.
Security
Certificate transparency & subdomain finder
Searches Certificate Transparency logs (via crt.sh) for a domain's certificates, and surfaces any subdomains in them.
Most recent certificates:
| Common Name | Issuer | Valid From | Valid To |
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