DNS Ninja - DNS Lookup Tools

dns.ninja provides fast, accurate DNS tools for developers, sysadmins, and network engineers. Query any domain's DNS configuration with detailed record information, DNSSEC validation, and threat intelligence.

Available Tools

DNS Lookup

Query A, AAAA, CNAME, MX, NS, HTTPS/SVCB, and SOA records for any domain. Full recursive resolution from root servers with DNSSEC validation. See exactly what's configured with TTLs and delegation chain details.

MX Lookup

Find mail servers for any domain. View MX record priorities and verify email routing configuration. Includes reverse lookup to find all domains using a mail server.

NS Lookup

Identify authoritative nameservers for a domain. See NS source flags (zone vs delegated vs SOA mname) and verify delegation consistency. Includes reverse lookup to find all domains on a nameserver.

TXT Lookup

Query TXT records including SPF, DKIM, DMARC policies, and domain verification tokens. Essential for email security auditing and verifying domain ownership.

Reverse DNS Lookup

Find all domains pointing to an IP address, using a nameserver, or routing mail through a specific server. Map infrastructure relationships across millions of domains.

Domain Lookup

Full domain analysis: DNS records, DNSSEC status, threat intelligence (Majestic, Tranco, blocklists), and infrastructure mapping.

Why DNS Ninja?

Fully recursive - We perform real recursive resolution from root servers, walking the full delegation chain. Not cached resolver lookups.

DNSSEC validation - Every query validates DNSSEC signatures from root to domain. See whether responses are cryptographically verified.

Threat intelligence - Domain lookups include Majestic ranking, Tranco popularity, and blocklist status.

Bidirectional lookups - Forward DNS (domain → IP) and reverse DNS (IP → domains, NS → domains, MX → domains).

Passive DNS history - Every record includes an observation timeline going back to 2009 (coverage varies by domain). Track nameserver migrations, IP changes, and infrastructure evolution over time. Historic reverse lookups show which domains previously used a nameserver, mail server, or IP.

Common Use Cases

Troubleshooting

  • Website not loading? Check if A records point to the right IP
  • Email bouncing? Verify MX records and mail server configuration
  • SSL certificate failing? Confirm domain ownership via DNS

Migrations

  • Planning a hosting move? Document current DNS before changes
  • Switching email providers? Map existing MX configuration
  • Changing registrars? Verify nameserver delegation

Monitoring

  • Verify DNS changes have propagated globally
  • Audit nameserver consistency across providers
  • Track TTL values for cache planning

Try It Now

Enter any domain in the search box above, or try these examples:

API Access

DNS Ninja data is available via MCP (Model Context Protocol) for AI agents and programmatic access. Query DNS records, perform reverse lookups, and access threat intelligence through the robtex MCP server.

DNS Ninja is part of a family of network tools:

  • RBLS - IP and domain reputation checking against 100+ blocklists
  • RTSAK - BGP routing and AS number analysis
  • HashXP - Bitcoin and Lightning Network explorer

API & SDK

All DNS Ninja data is available programmatically:

  • TypeScript SDK —npm install @robtex/sdk— zero dependencies, 55 typed methods
  • REST API — free tier, no key required
  • RapidAPI — managed billing, plans from $19/mo
  • MCP Server — for AI agents (Claude, ChatGPT, Grok)

FAQ

Which DNS Ninja tool should I use for my task?
For general troubleshooting, start with DNS Lookup. For email issues, use MX Lookup or TXT Lookup (SPF/DKIM). For delegation problems, try NS Lookup. To find all domains on an IP or server, use Reverse DNS.
Does DNS Ninja validate DNSSEC?
Yes. Every query performs full DNSSEC chain-of-trust validation from the root zone. Results show whether responses are cryptographically verified ("Secure"), unsigned ("Insecure"), or failing validation ("Bogus").
How is DNS Ninja different from command-line tools like dig?
DNS Ninja performs full recursive resolution from root servers — you see the complete delegation chain, not cached resolver data. It also integrates DNSSEC validation and threat intelligence (Majestic, Tranco, blocklists) that CLI tools don't provide.
Can DNS Ninja help with email deliverability?
Yes. Use MX Lookup to verify mail server configuration, TXT Lookup to audit SPF, DKIM, and DMARC records, and Domain Lookup for the full picture. For IP-based blocklist checking, see RBLS.org. --- Last modified: 2026-02-14