DNS
Verify DNS and email records
DNS lookup, propagation, MX, SPF, DKIM, and DMARC workflows for domain and email authentication validation.
DNS tools — when to use which
DNS Lookup vs DNS Propagation
DNS Lookup queries authoritative or default resolvers for the current answer. DNS Propagation compares multiple public resolvers to detect cache lag after changes.
SPF vs DKIM vs DMARC
SPF authorizes sending IPs. DKIM signs messages cryptographically. DMARC defines policy and reporting when SPF/DKIM fail. Use all three for strong email authentication.
DNS Lookup
Query A, AAAA, MX, TXT, NS, SOA, PTR, and SRV records.
SPF Checker
Parse and validate SPF records for email authentication.
DKIM Checker
Look up DKIM selector records for a domain.
DMARC Checker
Retrieve and parse DMARC policy records.
DNS Propagation
Check DNS record propagation across global resolvers.
Bulk DNS Lookup
Look up DNS records for multiple domains from a list or CSV upload.
Common questions
Compare authoritative DNS Lookup results with DNS Propagation across resolvers. If authoritative is correct but resolvers differ, wait for TTL expiry or reduce TTL before future changes.
Use the SPF Checker on Nexabit Network Utilities. Enter your domain and review mechanisms, lookup count, and syntax before sending production email.
Part of Nexabit Network Utilities · How-to guides