Network & DNS Tools
Subnets, CIDR ranges, DNS records, and propagation checks for the network layer under your services.
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Packet Capture Analyzer
Paste tcpdump output for a traffic summary — top talkers, ports, protocol/flag mix, and heuristics for refused connections, dropped SYNs, and scans.
DNS Lookup
Look up A, AAAA, MX, TXT, NS, CNAME, and SOA records for any domain over DNS-over-HTTPS — with TTLs and DNSSEC status, straight from your browser.
IP & ASN Lookup (Whose IP)
Find who is behind any IP address — ASN, network owner, hosting or carrier, geolocation, and reverse DNS — the classic "whose IP is this" lookup for triage.
SSL Checker from URL
Fetch the live TLS certificate chain from any https URL or host:port — issuer, SAN list, expiry countdown, key type, and chain trust. No openssl needed.
Reverse DNS / PTR Lookup
Resolve an IP address back to its PTR / reverse-DNS hostname and forward-confirm the match — the FCrDNS check that mail servers and allowlists rely on.
DNS Propagation Checker
Check whether a DNS record change has propagated by querying multiple public resolvers around the world and comparing their answers side by side.
Email DNS Checker
Audit a domain's email DNS in one shot — MX, SPF, DKIM, and DMARC records — and flag missing or misconfigured policies that hurt deliverability.
Port Reachability Check
Check whether a single TCP port is reachable on a host — a quick connectivity test for firewalls, security groups, and services during an incident.