Network & Email Diagnostics

Check DNS MX records for a domain to see its mail server configuration.

Check if an IP or domain is listed on 5 major DNS-based blacklists (Spamhaus, SpamCop, SORBS, Barracuda, Surriel).

Check an IP against threat-focused blocklists (DroneBL, UCEPROTECT, AHBL, Tor Exit Nodes). Complements the standard blacklist check.

Test SMTP server connectivity on port 25, perform EHLO handshake, and measure response times.

Check SPF (Sender Policy Framework) records to see who can send email for a domain.

Check DKIM (DomainKeys Identified Mail) records for email signing verification.

Lookup DMARC policy records that tell receivers how to handle unauthenticated email.

Check BIMI records that allow brands to display verified logos in email clients.

Check MTA-STS policy that enforces TLS for SMTP connections.

Check TLSRPT records that define where to send TLS reporting data.

Comprehensive email health report for a domain including MX, SPF, DMARC, and more.

Generate SPF records for your domain with templates for Google, Office 365, and Zoho.

Generate DMARC policy records for your domain.

Analyze raw email headers to diagnose delivery issues.

Lookup IPv4 address (A record) for a hostname.

Lookup IPv6 address (AAAA record) for a hostname.

Check the canonical name (CNAME) that maps an alias to a real domain.

Reverse DNS lookup — find the hostname associated with an IP address.

Get the Start of Authority (SOA) record for a domain.

Check all TXT records for a domain, including SPF, DKIM, and verification records.

Query multiple DNS record types at once (A, AAAA, MX, NS, TXT, SOA, SPF, DMARC, CNAME, SRV).

Lookup Service (SRV) records for a domain.

Lookup DNSKEY records used for DNSSEC validation.

Lookup Delegation Signer (DS) records for DNSSEC.

Lookup DNSSEC RRSIG signature records.

Lookup NSEC records for DNSSEC denial of existence.

Lookup NSEC3PARAM records for DNSSEC.

Lookup Certificate (CERT) records in DNS.

Lookup Location (LOC) records in DNS.

Lookup IPSECKEY records for IPsec keying.

Compare A record resolution across Cloudflare (1.1.1.1), Google (8.8.8.8), and Quad9 (9.9.9.9).

Get domain registration information including owner, dates, and registrar.

Get IP address block ownership and registration information.

Find the Autonomous System Number (ASN) and its details for an IP.

Check if a host is reachable via ICMP ping (fallback to TCP connect in cloud environments).

Trace the network path to a host (falls back to latency check when traceroute is unavailable).

Verify if a specific TCP port is open on a target IP or hostname.

Verify if a domain responds to HTTP connections and check response headers.

Verify HTTPS connectivity, check response status, and inspect TLS certificate details.

Check if a domain has an llms.txt file for AI language model guidance.

Check robots.txt for LLM/AI crawler directives.

Show your current public IP address and reverse DNS.

Extract email addresses from any text.

Generate secure random passwords.

Run A record lookups for multiple domains at once.