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Retrieve and display the DNS records for a domain.

A full DNS report for a domain in one pass.

Check A and NS propagation across global DNS servers.

Walk a domain’s DNSSEC chain of trust and signatures.

Inspect the mail exchange records for a domain.

Verify SPF records and spot what to tighten.

Validate an SPF record to help prevent spoofing.

Ownership, registration and contact details for a domain.

Registration and expiry dates, with time remaining.

Validate a certificate and flag what is wrong with it.

Resolve a domain name to its IP address.

Inspect and validate the HTTP headers a URL returns.

Status codes and redirect paths for www and non-www.

Send requests with custom methods, headers and bodies.

Catch and inspect webhooks and HTTP requests.

Check host reachability with ICMP echo requests.

Map the network path to a host and see where it slows.

Location, ISP and other details for an IP address.

Ownership and registration info for an IP address.

See whether an IP appears on DNS-based blocklists.

Find the domains associated with an IP address.

Convert between IPv4, IPv6, decimal, hex and binary.

Calculate subnets for IP address planning.

Identify the manufacturer behind a MAC address.

MD5, SHA256, SHA512 and SHA3-512 hashes from text.

URL, Base64 and HTML escape, both directions.

Highlight the differences between two texts.

Count characters, words and lines in a string.

Generate strong, random passwords.

Random numbers with the digit length and count you set.

Dates to Unix timestamps and back, with timezones.

Build crontab schedule strings for Linux.

QR codes with custom size, color and error correction.

Create barcodes in multiple formats.

Dedupe, check formats, verify domains and mail servers.

Clean up and format JSON.

Test regular expressions against sample strings.

Format SQL queries so they read cleanly.

Compress or format JavaScript.

Compress or format CSS.