Overview
MxToolBox
Email Security & DNS Diagnostic Tools
MxToolBox specializes in email deliverability tools including MX lookups, blacklist monitoring, SPF/DKIM/DMARC validation, and DNS diagnostics.
Limited free lookupsWhoisXML API
Enterprise Domain, IP & DNS Intelligence
WhoisXML API offers product-specific WHOIS, DNS, IP, and threat data packages plus annual enterprise bundles for research, fraud, and security teams.
Complimentary credits after signupPricing Comparison
| Pricing | MxToolBox | WhoisXML API |
|---|---|---|
| Free Tier | Limited free lookups | Complimentary credits after signup |
| Paid Plans | From $99/month | Product-specific subscriptions |
| Enterprise | Enterprise plans available | Enterprise annual subscriptions |
| TLD Coverage | All domains supported | 7,500+ TLDs |
Feature Comparison
| Feature | MxToolBox | WhoisXML API |
|---|---|---|
| Free Tier | Limited | Limited |
| API Access | Included | Included |
| Bulk Operations | Included | Included |
| Real-time Data | Included | Included |
| WHOIS Data | Not Included | Included |
| DNS Lookup | Included | Included |
| Domain Valuation | Not Included | Not Included |
| Brand Monitoring | Included | Premium Only |
| MCP/AI Integration | Not Included | Not Included |
Which is Better?
Choose MxToolBox if you need
- Best-in-class email diagnostics
- Blacklist monitoring
- SPF/DKIM/DMARC validation
Choose WhoisXML API if you need
- Very broad domain and infrastructure coverage
- Historical WHOIS, DNS, and threat data
- Enterprise packages for security workflows
Consider DomScan Instead
DomScan offers the best of both worlds with comprehensive features and developer-friendly pricing.
- ✓ Free tier: 10,000 credits/month (no credit card)
- ✓ 1,500+ TLDs supported
- ✓ MCP integration for AI assistants
- ✓ Domain valuation, brand monitoring, OSINT
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