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Developer, security and utility tools that help us work smarter every day.
16 tools
Look up a domain’s registration status, key dates, and nameservers via RDAP.
Open toolLook up what a well-known network port is used for, or generate a random ephemeral port for local dev.
Open toolLook up the MIME type for a file extension, or the other way around.
Open toolLook up what an HTTP status code means, searchable by number or keyword.
Open toolConvert between Unicode domain names and their Punycode (xn--) form, to spot homograph phishing domains.
Open toolCalculate a CIDR block’s network range, or classify an IPv4/IPv6 address as public, private, or reserved.
Open toolLook up a domain’s DKIM record for a selector you provide, and explain its tags.
Open toolLook up and explain a domain’s DMARC policy, tag by tag.
Open toolLook up and explain a domain’s SPF record, mechanism by mechanism.
Open toolLook up A, AAAA, MX, TXT, NS, and CNAME records for a domain.
Open toolBreak a User-Agent string down into browser, operating system, device type, and engine.
Open toolFetch a sitemap.xml and see whether it’s a URL list or a sitemap index, and how many entries it has.
Open toolFetch a domain’s robots.txt and break down its user-agent rules and sitemap references.
Open toolPaste HTTP response headers you already have and get the same security-header explanation.
Open toolFetch a URL and check which HTTP security headers it sends, and which are missing or weak.
Open toolBreak a URL down into its protocol, host, path, query parameters, and fragment.
Open tool