Compare text, test regular expressions, parse URLs, User-Agent strings and Cron schedules, inspect network and DNS information, look up commands, run short code snippets or view SQLite files read-only.
Query public records such as A, AAAA, MX, TXT, etc., and display TTL and parsing status.
View DKIM public records for MX, SPF, DMARC and the specified selector.
Convert IPv4 or IPv6 to a reverse lookup name and view public PTR records.
Viewing the certificate issuance authority record for the current name does not replace the complete issuance policy check.
Look at the DNS response for verification flags; unsigned does not mean verification failed.
Check the current exit IP, region and connection time, and you can also query the ASN, network organization and city information.
Split the complete link into protocols, domain names, ports, paths and fragments. Query parameters are edited individually in order of appearance, making it easy to troubleshoot duplicate keys, null values, and encoding issues.
The five segments of Cron represent minutes, hours, days, months, and weeks in sequence. First use Chinese instructions to understand the cycle, and then check the running time with time zone offset to avoid tasks being executed at the wrong time.
Parses browser, operating system, engine, device, and CPU clues from User-Agent strings. Displays parsing results by category, supports examples and manual reading of the current browser UA, and does not perform device fingerprint detection.
Compare two pieces of text locally, distinguish additions and deletions, and retain differences in spaces, tabs, and line breaks. Supports swapping sides, blank examples, and variation quantity summaries without uploading or creating sharing links.
Run browser JavaScript regex in isolation and view matching text, UTF-16 positions, capturing groups, and named groups. Provides flags switches and examples, stops with timeout, and displays up to 500 matches.
Search for independently written descriptions of common commands, read-only examples, and easily overlooked limitations.
Check out common JavaScript regular rules, matching examples, and validation boundaries, and copy and test them yourself.
Execute the short Python example in an isolated browser environment and see the printed results.
Run a short Lua example on a separate background thread and see the printed results or errors.
Open a local SQLite file, select a common data table, and view fields and records in pages.