Network Tools

Email & DNS Security Tools: SPF, DMARC, DKIM and Mail DiagnosticsEmail DNS tools for checking SPF, DMARC, DKIM, MX records and account safety practices.SPF Record CheckerSPF syntax and sending policy...

Run a reverse DNS lookup for an IP address or hostname, inspect PTR records, check forward match consistency and understand mail server hygiene.

Look up WHOIS data for a domain, parse registrar, expiry date, nameservers, status codes, DNSSEC, renewal risk and DNS context.

Check TCP ports for a host or public IP, use service profiles, read exposure notes, review common ports and copy a firewall troubleshooting report.

Run repeated website status checks, compare final responses with first-response headers and redirect path, and build an availability report for troubleshooting and technical SEO.

Trace redirect chains, compare HTTP and hostname variants, inspect migration URLs and review final canonical signals from one redirect audit.

Check live HTTP response headers, security policy coverage, cache and compression clues, redirect path context, cookie flags and raw server signals from one practical report.

Check the TLS certificate served for a host, review expiry, issuer, subject, SAN coverage, expected hostnames and HTTPS context before renewal or launch.

Check DNS records for a domain, including A, AAAA, MX, TXT, NS, SOA, CAA, SPF, DMARC hints, TTLs and resolver comparison for troubleshooting.

Calculate IPv4 subnets from a CIDR prefix or netmask, inspect network ID, broadcast, usable range, binary bits, membership, equal splits and VLSM allocations.