Tools

Runs 24 parallel probes against your browser's actual resolver path and checks whether your DNS exits the country you expect. If you're on a VPN, a mismatch here is worth looking at.

Returns your current public IP address with geo: country, region, city, ISP, ASN. Pass any IPv4 or IPv6 address to look it up instead.

Run DNS queries for A, AAAA, MX, TXT, NS, CNAME, SOA, SRV, or PTR records. Choose your resolver: Cloudflare, Google, Quad9, or OpenDNS.

Check registrar, creation date, expiry, nameservers, and DNSSEC status for any domain. Returns days-until-expiry and registration age.

Inspect any domain's TLS certificate: issuer, subject, SANs, expiry, chain validity, protocol version, and cipher suite.

Calculate network ranges, masks, broadcast addresses, host counts, and IPv6 expanded forms from any IPv4 or IPv6 CIDR block.

Parse standard five-field cron expressions, macros, ranges, lists, steps, and month or weekday names, then preview the next scheduled runs.

Generate UUIDs across common versions or decode existing UUIDs to inspect version, variant, timestamp, clock sequence, and node data when available.

Verify message digests, HMAC-SHA256 values, and raw public-key signatures locally in the browser without sending data to an external service.

Decode, inspect, and encode JSON Web Tokens locally. Supports readable header/payload output, registered claim timestamps, HMAC signing, and HMAC or public-key signature checks.

Check whether a public TCP port is open, closed, timed out, or unreachable from the server side.