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What's new

New tools, new cheat sheets and meaningful updates, newest first.

November 2026

  1. New tool

    AWS Security Group analyzer

    Paste a describe-security-groups export to find open ports, redundant and shadowed rules, see a traffic diagram and the impact of removing a rule.

  2. New tool

    Azure NSG analyzer

    Paste an Azure NSG export to find open ports, hidden conflicts between subnet and NIC rules, and see a traffic diagram.

  3. New tool

    Cron expression builder

    Build a 5-field cron expression with a form (minute, hour, day, month, weekday), see a plain-language explanation and the next 5 run times.

  4. New tool

    DKIM checker

    Check a DKIM record for a selector: key type and length, testing mode and revoked keys. Look up selector._domainkey.domain in DNS or paste the record.

  5. New tool

    DMARC analyzer

    Check a DMARC record: policy, subdomain policy, pct and report addresses, with a diagram of what receivers do. Look it up in DNS or paste records.

  6. New tool

    DMARC record generator

    Build a DMARC record with policy, subdomain policy, report addresses and alignment settings, ready to publish as a TXT record.

  7. New tool

    DNS lookup

    Look up A, AAAA, MX, TXT, NS, CNAME, SOA and CAA records for any domain, directly from your browser.

  8. New tool

    Email header analyzer

    Paste email headers to see the delivery path, SPF, DKIM and DMARC results, and spot spoofing signs like a mismatched From domain.

  9. New tool

    IAM Policy analyzer

    Paste an AWS IAM policy to find overly broad permissions, privilege escalation paths and confused-deputy risks, and simulate requests.

  10. New tool

    Kubernetes manifest analyzer

    Paste a Kubernetes manifest to find missing resource limits, risky security settings, overly broad RBAC rules, and get a suggested patch.

  11. New tool

    MAC vendor lookup

    Find the manufacturer of a network device from its MAC address (OUI), and check whether an address is locally administered.

  12. Platform

    New navigation by area, area pages, a faster search, My tools and this What’s new page.

  13. New tool

    SPF analyzer

    Check an SPF record: lookup count against the limit of 10, include chain, -all vs ~all and risky IP ranges. Look it up in DNS or paste records.

  14. New tool

    SPF record generator

    Build an SPF record from the IP ranges, includes, and A/MX records that send mail for your domain, with a live lookup count against the limit of 10.

  15. New tool

    VPC/subnet planner

    Plan subnets inside a VPC or VNet, see usable addresses after provider reservations, catch overlaps, and export Terraform or CloudFormation.

  16. New tool

    X.509 certificate decoder

    Decode a PEM or DER X.509 certificate: subject, issuer, validity dates, public key, Subject Alternative Names and extensions.

  17. New tool

    XML formatter

    Format, validate and minify XML. Shows the element count and any syntax problems, with line and column numbers.

“New” lasts 30 days. “Updated” is only used for meaningful changes, not for typo fixes.

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