DNS
2No tools match your search.
DNS
DNS Lookup
★︎
Query any DNS record type for a hostname (A, MX, TXT, CAA…).
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DNS
Bulk DNS Lookup
★︎
Check many domains at once and export the results to CSV.
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SSL & certificates
Let's Encrypt Wizard
★︎
Issue a free Let's Encrypt SSL certificate manually — HTTP or DNS validation.
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SSL & certificates
SSL Checker
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Validity, chain, expiry and hostname match for any server.
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SSL & certificates
PEM to PFX
★︎
Bundle a certificate, key and chain into a password-protected .pfx.
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SSL & certificates
CSR Generator
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Generate a private key and a CSR with SANs, RSA or ECDSA.
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SSL & certificates
CSR Decoder
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Decode a CSR and verify its self-signature.
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SSL & certificates
CRT Decoder
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Read subject, issuer, SANs, fingerprints and expiry from a certificate.
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SSL & certificates
Key & CRT Match
★︎
Check that a private key really belongs to a certificate.
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SSL & certificates
Certificate Transparency Search
★︎
Every certificate ever issued for a domain — and the subdomains they reveal.
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Server
htpasswd Generator
★︎
Create a .htpasswd user line (bcrypt, APR1 or SHA) to protect a folder.
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SSL & certificates
TLS Protocol Scan
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Which TLS versions a server accepts, plus the cipher it negotiates.
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SSL & certificates
PFX to PEM
★︎
Split a .pfx / .p12 back into its certificate, key and chain.
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Network
Whois
★︎
Registrar, status, dates and nameservers for a domain or IP.
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Network
Blacklist Check
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Is your mail server IP on a spam blacklist? Checks 51 public DNSBLs.
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Network
IP Info
★︎
Geolocation, ASN, ISP and reverse DNS for an IP or hostname.
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Encoding
Base64 Encode / Decode
★︎
Encode or decode Base64 text, in the browser.
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Developer
HTML Sandbox
★︎
Write HTML, CSS and JS and see it render live, isolated from the site.
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Developer
I or L Checker
★︎
Tell l, I, 1, O and 0 apart — and catch invisible or fake Unicode characters.
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Encoding
URL Encode / Decode
★︎
Percent-encode or decode URLs and query strings.
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