Tools for IT technicians

Read a zone, follow a change, understand why an email lands in spam.

• DNS Lookup

  Check A, MX, SPF, DKIM, DMARC, duplicates, DNSSEC and more; guesses DKIM selectors from your provider.

• DNS Propagation

  Is a DNS change visible at Cloudflare, Google, Quad9 and six other resolvers?

• Email header analyzer

  Delivery path, delays, SPF/DKIM/DMARC, alignment and spam signals of a message.

Audit a page or a sitemap the way a search engine would.

• SEO report

  Technical audit of a page: tags, headings, broken links, Open Graph, JSON-LD, robots.txt, HTTPS and security headers.

• Sitemap checker

  Checks a sitemap.xml: XML, indexes, gzip, 50,000 URLs, duplicates, lastmod, robots.txt and a sample of tested pages.

Split an export too large to import, check that a migration lost nothing.

• ICS file splitter

  Split a large .ics calendar by number of events, size, year or month.

• ICS file comparer

  Source minus destination: the events of one calendar that are missing from another.

Everyday calculations and conversions: subnets, JSON, encodings, units, passwords.

• Subnet calculator (CIDR, VLSM)

  Network, mask, host range, subnets and VLSM for IPv4 and IPv6.

• JSON formatter and validator

  Validates, indents, minifies and sorts JSON; locates each error to the line and column.

• Encoder / decoder (Base64, JWT, hash…)

  Base64, URL, hex, HTML, JWT, MD5/SHA, timestamps and UUIDs.

• IT unit converter

  Bytes, GB/GiB, Mbit/s, transfer time, hexadecimal, binary and octal.

• Password generator

  Random or pronounceable passwords and PIN codes, with a strength estimate.