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 Record Checker
Lookup and validate SPF records to prevent email spoofing and improve deliverability.
DNSSPF · Email
Domain DNS Validation
Automatic checks for missing or misconfigured DNS records and common errors.
AuditRecords · Errors
Reverse IP Lookup
Resolve IP addresses to hostnames — useful for identifying shared hosting.
NetworkIP · Hosts
DNS Lookup
Retrieve A, AAAA, CNAME, MX, NS, TXT and other DNS records for any domain.
LookupAll records
CNAME Lookup
View CNAME chains and canonical hostnames for a given entry.
DNSCNAME
NS Lookup
Display authoritative nameservers and delegation for the domain.
DNSNameservers
MX Lookup
See mail exchange records and priorities to diagnose email routing.
EmailMail servers
WhatsMyDNS
Check DNS propagation across multiple global resolvers to verify updates.
PropagationGlobal
DMARC Validation Tool
Validate DMARC records and check for correct policies and syntax.
EmailDMARC
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
DNSKEY Lookup
Inspect DNSSEC keys and signatures (DNSKEY) to verify domain signing.
DNSSECSecurity
DS Lookup
Lookup DS records used for DNSSEC delegation verification.
DNSSECDS
DKIM Checker
Validate DKIM selectors and public keys to protect mail integrity.
EmailDKIM