Free DNS & Email Security Tools
Instant, free tools to audit domain records, build email authentication policies (SPF, DMARC, DKIM, BIMI), and check SSL & blacklist statuses.
SPF Record Generator
Construct compliant Sender Policy Framework (SPF) records to authorize sending mail servers and prevent email spoofing.
SPF Lookup Calculator & Flattener
Recursively audit the RFC 7208 10-lookup ceiling, resolve nested include: mechanisms, and generate zero-lookup flattened records.
BIMI Checker & VMC Validator
Audit BIMI DNS records, validate SVG Tiny-PS compliance, and preview how your verified brand logo appears in Gmail & Apple Mail.
DMARC Policy Builder
Define your DMARC enforcement policy (none, quarantine, reject) and configure aggregate report delivery targets.
DKIM Record Builder
Format cryptographic DomainKeys Identified Mail (DKIM) TXT records and selectors for email verification.
DMARC Compliance Validator for Agencies
Audit client domain compliance against Google and Yahoo bulk sender requirements.
DNSBL Blacklist Checker
Query major anti-spam RBL and DNSBL databases to ensure your domain and sending IP addresses are clean.
Subdomain Takeover Checker
Identify dangling DNS CNAME records pointing to decommissioned AWS, GitHub, or Vercel cloud services.
SSL Certificate Checker
Verify SSL/TLS certificate validity, issuing authority, expiry countdown, and cipher configuration.
WHOIS & Registrar Inspector
Query domain registration records, registrar details, registration lifecycle dates, and transfer lock status.
DNS Record Inspector
Inspect live A, AAAA, MX, TXT, CNAME, and NS records across global DNS resolution nodes.
SEO & AI Search Readiness Auditor
Audit robots.txt accidental de-indexing, sitemap.xml reachability, and llms.txt conversational AI search posture.