DNS tools for developers: lookup, WHOIS, bulk, and SPF in one place
DNS lookup for debugging
When something breaks — a deployment, a CDN cutover, an email delivery failure — the first question is usually "what record is actually being served?" DNS Buddy queries A, AAAA, MX, TXT, NS, CNAME, SOA, PTR, and CAA records from Google, Cloudflare, Quad9, and OpenDNS simultaneously. You see what each resolver returns in a single view, making resolver disagreements immediately visible.
Try DNS LookupBulk DNS for migrations and audits
Post-migration verification, pre-launch DNS audits, fleet health checks — these require checking the same record type across tens or hundreds of domains. DNS Buddy's bulk lookup accepts up to 256 domains at once. Paste your list, pick your record type, get results. Export to CSV for documentation or ticket evidence.
Try Bulk DNS LookupWHOIS for domain and IP research
Investigating an IP block showing up in your logs? Checking who registered a domain before you set up a third-party integration? DNS Buddy's WHOIS uses RDAP — the structured replacement for legacy WHOIS — and returns parsed, readable output instead of raw text dumps. Mix domains, IP addresses, and ASNs in a single session.
Try WHOIS LookupSPF analysis for email authentication
SPF records with deep include chains are hard to reason about manually. DNS Buddy's SPF checker fully expands every include, resolves IP ranges, and labels each range with its owner (Google Workspace, SendGrid, Mailgun, etc.). It also tracks lookup depth and warns when you're approaching the 10-lookup limit — the most common cause of SPF failures.
Try SPF CheckerSubdomain enumeration
Before you retire a domain or hand over infrastructure access, it helps to know what's actually pointing at it. DNS Buddy's subdomain finder uses certificate transparency logs and passive DNS data to surface subdomains without active scanning. No noise, no rate-limit risk.
Try Subdomain FinderFull domain snapshot
When onboarding to a new codebase or infrastructure, Domain Digger queries all major record types in one pass and identifies providers from the results — CDN, email provider, DNS host, and more. Faster than running individual queries for each record type.
Try Domain DiggerAll tools at a glance
All free, all in-browser, no account required.
Frequently asked questions
What DNS tools do developers use most?
DNS lookup (to debug record propagation and verify deployments), WHOIS (to investigate domain ownership and IP allocation), SPF analyzers (to debug email authentication failures), and bulk DNS tools (to audit fleets of domains during migrations). DNS Buddy covers all four in one place.
How do I check DNS records without installing anything?
DNS Buddy runs entirely in the browser — no install, no CLI, no account. Go to DNS Lookup, enter a domain, and query any record type from multiple resolvers simultaneously.
Can I run bulk DNS lookups for a migration audit?
Yes. Bulk DNS Lookup accepts up to 256 domains at once. Paste your domain list, pick a record type, and get all results in a single pass with CSV export.
Start using DNS Buddy — free, no account needed
Pick a tool and start. No signup, no install, no rate limits on the core workflows.
Want to understand why DNS changes take time? How DNS propagation works — TTL, resolver caching, and verifying changes across resolvers.
Running infrastructure? DNS tools for DevOps covers bulk FCrDNS, fleet auditing, and subnet tooling.
Comparing with other tools? MxToolbox, DNSChecker, WhatsMyDNS, and nslookup.io comparison pages.