One Tools
Find the right tool for your next task.
Check domains and networks, convert data, generate codes, and explore services. Search the catalog or choose a category to get started.
Tools marked “Japanese interface” open in Japanese. English descriptions help you choose a tool; its questions and controls may still be in Japanese.
Tools and guides: 31
Password generator
Choose a length and character types to generate passwords on your device, with batch generation, copying, and CSV export.
Japanese interfaceOpen in Japanese GeneratorsQR code generator
Create QR codes for URLs, contact cards, and email. Adjust their appearance and download image files.
Japanese interfaceOpen in Japanese DomainsWHOIS domain and IP lookup
Look up domain registration details and supported IPv4 WHOIS responses, including the queried source and lookup time.
Open tool ConvertersUnix time converter
Convert between dates and Unix timestamps in seconds or milliseconds. Choose a time zone and check daylight saving transitions.
Japanese interfaceOpen in Japanese ConvertersCharacter encoding converter
Encode and decode HTML entities, URL encoding, Unicode escapes, and numeric character references.
Japanese interfaceOpen in Japanese Developer toolsJSON formatter
Format, minify, validate, and sort JSON data. Import and export files while keeping their contents on your device.
Japanese interfaceOpen in Japanese Developer toolsNaming convention converter
Convert variable and function names into 12 naming conventions, including camelCase, snake_case, and kebab-case.
Japanese interfaceOpen in Japanese DomainsDo I need a domain name?
Answer questions about your plans to explore uses for a domain name and decide when to register one.
Japanese interfaceOpen in Japanese ServersWhich hosting setup do I need?
Use a questionnaire to consider a hosting and maintenance setup that fits the website you want to create.
Japanese interfaceOpen in Japanese Business toolsDo I need business email?
Review your work email needs and explore options for introducing or improving business email.
Japanese interfaceOpen in Japanese Service questionnairesDo I need a website?
Clarify the purpose of your website and identify the next steps toward publishing it.
Japanese interfaceOpen in Japanese Service questionnairesIs WordPress right for me?
Answer questions to compare approaches to creating and maintaining your website.
Japanese interfaceOpen in Japanese Service questionnairesAm I ready to start a business?
Review your preparation for a business or side project and identify what to work on next.
Japanese interfaceOpen in Japanese Domains and networksTroubleshoot a network problem
Choose your symptom to narrow the area to investigate. Start with another device or connection and a record of the error.
Open tool Domains and networksNetwork terms and practical checks
Read each term through its meaning, an example, the limits of a conclusion and the next useful check.
Open tool Domains and networksTLD directory and registry search
Find domain suffix types and registry managers in the primary registry data.
Open tool Domains and networksIPv4 address-space allocations
Find the large allocation blocks and administrators of IPv4 address space.
Open tool Domains and networksDomain tools — DNS, RDAP, punycode
A hub for checking DNS records, dig-format queries, nslookup, RDAP, and punycode conversion.
Open tool Domains and networksCheck DNS records
Enter a host name to inspect its published DNS records.
Open tool Domains and networksdig format
See the question and answers in a dig-style layout.
Open tool Domains and networksnslookup
Inspect name resolution the way nslookup presents it.
Open tool Domains and networksCompare DNS records
Compare answers from two public DNS providers with individual observation times.
Open tool Domains and networksDomain and IP Registration (RDAP)
Check domain dates and status, or public IP registration ranges and network names.
Open tool Domains and networksIDN and Punycode conversion
Enter Unicode or an xn-- name to see both forms and their label-by-label correspondence.
Open tool Domains and networksSite & email diagnostics
Choose DNS, email-setting and connection-information tools, read what each observation can establish and open the next useful check.
Open tool Domains and networksIP address check
See your public IP, connection and browser information. Use the results to compare networks or explain a problem to support.
Open tool Domains and networksEmail deliverability
Inspect SPF, DMARC and receiving MX records to narrow down possible causes. This DNS check cannot verify a message's authentication result or confirm delivery.
Open tool Domains and networksSPF check
Inspect SPF records and references for duplicates and possible ten-term limit issues. This does not evaluate SPF authentication for an individual message.
Open tool Domains and networksDKIM check
DKIM needs a selector. Enter the selector from the mail header's s= (e.g. google, selector1).
Open tool Domains and networksDMARC check
Query the _dmarc TXT and read the policy (none/quarantine/reject); if absent, walk up to an ancestor (parent) domain (RFC 9989).
Open tool Domains and networksMX record lookup
List the servers (MX) that receive mail for the domain, in priority order.
Open tool
