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CHOOSE THE RIGHT TOOL

Web & network

Debug web requests, review domain configuration and prepare website assets. Files stay local; an explicit DNS lookup identifies its public resolver.

Which tool should I use?

Inspect public DNS

Query MX, TXT, NS, SOA and more, or inspect a saved response.

Try DNS Record Inspector →

Review a network capture

Inspect waterfalls, failed requests and payloads in a local HAR.

Try HAR Network Analyzer →

Check email authentication

Review SPF syntax and supplied include graphs.

Try SPF Record Analyzer →

Understand cache behavior

Separate storage, freshness and revalidation.

Try HTTP Cache Debugger →

Prepare a sitemap

Build XML from real URLs or inspect existing entries.

Try XML Sitemap Studio →

Test crawl rules

Review user-agent precedence and the winning robots rule.

Try Robots.txt Rule Tester →

Aggregate address ranges

Merge IPv4/IPv6 sets and subtract exclusions.

Try IP Range & CIDR Aggregator →

Review security headers

Keep established header and policy utilities available.

Try Security Headers Analyzer →

Explore a related workflow

DNS Record Inspector: practical guide
Look up public DNS records and inspect resolver answers.
DNS Zone File Validator: practical guide
Check common BIND zone records and configuration conflicts.
SPF Record Analyzer: practical guide
Review SPF mechanisms, IP ranges and DNS lookup limits.
DMARC Record Studio: practical guide
Build and check a DMARC DNS policy with clear tag explanations.

All practical guides →