DNS Tools Share Tweet A curated collection of free DNS utilities for webmasters, developers and sysadmins. Quickly inspect DNS records, validate SPF/DMARC/DKIM, check propagation and diagnose DNS issues to keep your domain healthy and deliverable. DNS Tools list SPF SPF Record Checker Lookup and validate SPF records to prevent email spoofing and improve deliverability. DNSSPF · Email DNS Domain DNS Validation Automatic checks for missing or misconfigured DNS records and common errors. AuditRecords · Errors IP Reverse IP Lookup Resolve IP addresses to hostnames — useful for identifying shared hosting. NetworkIP · Hosts A DNS Lookup Retrieve A, AAAA, CNAME, MX, NS, TXT and other DNS records for any domain. LookupAll records CNAME CNAME Lookup View CNAME chains and canonical hostnames for a given entry. DNSCNAME NS NS Lookup Display authoritative nameservers and delegation for the domain. DNSNameservers MX MX Lookup See mail exchange records and priorities to diagnose email routing. EmailMail servers WG WhatsMyDNS Check DNS propagation across multiple global resolvers to verify updates. PropagationGlobal DM DMARC Validation Tool Validate DMARC records and check for correct policies and syntax. EmailDMARC HD Domain DNS Health Checker Quick health report covering DNS, DNSSEC hints and basic SSL observations. AuditHealth @ DMARC Record Generator Create DMARC records with recommended options and easy copy-to-DNS support. GeneratorDMARC KEY DNSKEY Lookup Inspect DNSSEC keys and signatures (DNSKEY) to verify domain signing. DNSSECSecurity DS DS Lookup Lookup DS records used for DNSSEC delegation verification. DNSSECDS DK DKIM Checker Validate DKIM selectors and public keys to protect mail integrity. EmailDKIM