ViewDNS.info is one of the original DNS lookup platforms — a veteran tool that predates most of its modern competitors. It has accumulated 1,854 referring domains over the years, a testament to how long it has been the go-to reference for sysadmins and researchers. Tools like reverse IP lookup, reverse WHOIS, IP history, and subdomain finder appear on ViewDNS before they appeared anywhere else.
That heritage is genuine. When you need to see the historical IP addresses a domain has resolved to, or find all domains that have ever been registered to a specific email address, ViewDNS has capabilities that few free tools match.
DomainScan approaches domain intelligence with a different emphasis: rather than historical investigation, the focus is real-time health analysis and continuous monitoring. Both perspectives matter — and the tools serve different use cases.
What Each Does
ViewDNS.info
ViewDNS’s catalog of tools covers both lookup and investigative use cases:
DNS and network tools:
- DNS records lookup — A, MX, TXT, NS, SOA, CNAME
- Reverse DNS lookup — hostname from IP
- DNS propagation check — resolver-by-resolver propagation status
- Ping / traceroute
- Port scanner
- IP location lookup
Investigative tools:
- IP history — historical record of which IPs a domain has resolved to over time
- Reverse IP lookup — find all domains hosted on a given IP address
- Reverse WHOIS — find all domains ever registered to an email or name
- Subdomain finder — enumerates subdomains via DNS brute force
- ASN lookup — Autonomous System Number information
- Get HTTP headers — server headers from any URL
- Email server test — tests SMTP connectivity and response
DomainScan
DomainScan’s approach is real-time health analysis and monitoring:
- Full DNS lookup — all record types with health scoring and anomaly detection
- Email authentication — SPF, DKIM, DMARC validation + alignment + 0-100 auth score
- Blacklist check — 50+ major DNSBLs for domain and outbound mail server IP
- SSL/TLS inspector — certificate validity, chain, expiry countdown, cipher analysis
- Domain Trust Score — composite health score across all dimensions
- WHOIS / domain age — registrar, age, expiry from RDAP
- DNS propagation — multi-region propagation check with TTL analysis
- Security headers — HTTP security header analysis and grading
- Prism AI — plain-English analysis + exact fix instructions for every finding
- Monitoring — blacklist alerts, DNS change detection, SSL expiry, email auth drift
- White-label reports — branded PDF/HTML for agency deliverables
- API + MCP — programmatic access and AI agent integration
Feature Comparison
| Feature | DomainScan | ViewDNS.info |
|---|---|---|
| DNS records lookup | ✅ With analysis | ✅ Raw data |
| Reverse IP | ✅ | ✅ |
| Reverse WHOIS | ❌ | ✅ |
| IP history | ❌ | ✅ |
| Subdomain finder | ✅ (in development) | ✅ |
| Port scanner | ✅ | ✅ |
| Ping / traceroute | ✅ | ✅ |
| SPF / DKIM / DMARC | ✅ Full validation | ❌ |
| Blacklist check | ✅ 50+ lists | ❌ |
| SSL certificate analysis | ✅ | ❌ |
| Security headers | ✅ | ❌ |
| Domain Trust Score | ✅ | ❌ |
| AI remediation (Prism) | ✅ | ❌ |
| MCP server | ✅ | ❌ |
| Domain monitoring | ✅ | ❌ |
| White-label reports | ✅ | ❌ |
| API access | ✅ | ❌ |
Pricing
ViewDNS.info
Entirely free — no paid plans, no account required. Revenue comes from advertising.
DomainScan
| Plan | Price | Domains | Highlights |
|---|---|---|---|
| Free | $0 | 1 | All 50+ tools, no signup for lookups |
| Pro | $9/mo | 10 | All monitors, alerts, API, MCP |
| Team | $29/mo | 50 | + PagerDuty, Discord alerts |
| Agency | $79/mo | 200 | White-label reports, client portal |
Where ViewDNS.info Wins
Historical IP data. ViewDNS’s IP history tool shows the historical IP addresses a domain has resolved to over time. This data is invaluable for security investigations — tracing phishing infrastructure, identifying hosting migrations, finding when a domain changed ownership. DomainScan doesn’t offer historical data.
Reverse WHOIS. Finding all domains ever registered to a specific email address or registrant name is a core investigative capability. ViewDNS has this. DomainScan does not (historical WHOIS aggregation requires expensive data partnerships).
Link equity. ViewDNS’s 1,854 referring domains represent years of community trust. Their tool links are cited in security research, sysadmin guides, and investigative journalism. That legacy creates a degree of validation that newer tools need time to accumulate.
Zero-friction access. No account, no rate limiting on the tools, just results. Classic free web tool experience.
Where DomainScan Wins
Email authentication. ViewDNS has no SPF validator, DKIM checker, or DMARC analyzer. For anyone diagnosing email deliverability or setting up authentication for a new domain, this gap is significant. DomainScan’s email authentication check validates the complete stack — syntax, alignment, key strength, policy strength, and reporting configuration — and scores the result.
Blacklist monitoring. A domain can have clean DNS and still have its email blocked by Spamhaus. ViewDNS doesn’t check blacklists. DomainScan checks 50+ DNSBLs and monitors continuously, alerting within minutes of a new listing.
AI-powered analysis. ViewDNS returns raw lookup results. DomainScan’s Prism AI interprets those results against RFC specifications and security best practices, then writes specific remediation instructions. The difference between “SPF record found: v=spf1 include:sendgrid.net ?all” and “Your SPF uses ?all (neutral qualifier) which provides zero protection — attackers can send email from your domain and receivers won’t block it. Change ?all to -all to enforce rejection” is the difference between raw data and actionable intelligence.
SSL analysis. ViewDNS has no SSL certificate checking. DomainScan analyzes the full certificate chain, checks expiry timelines, flags weak ciphers, and monitors for expiry — alerting you 30 days before a certificate lapses.
Modern UX. ViewDNS’s interface reflects its age — functional but dated. DomainScan’s interface is designed for clarity, showing results with visual health indicators, severity ratings, and structured explanations.
Monitoring. ViewDNS is a lookup tool. You check when you think to check. DomainScan watches continuously — when something changes or goes wrong, you’re alerted proactively.
MCP and API. DomainScan’s MCP endpoint and API enable workflow automation. ViewDNS has no programmatic access.
The Right Tool for the Right Job
ViewDNS.info excels at investigative lookups — understanding a domain’s past, finding hidden infrastructure relationships, enumerating the scope of an actor’s domain portfolio. These are retrospective, forensic use cases.
DomainScan excels at operational domain security — understanding your domain’s current health, fixing problems before they cause email failures or security incidents, monitoring for changes, and maintaining ongoing domain hygiene.
Use ViewDNS.info for: IP history research, reverse WHOIS investigations, subdomain enumeration, forensic DNS analysis.
Use DomainScan for: Email authentication setup and monitoring, blacklist alerting, DNS health analysis, SSL tracking, AI-assisted diagnosis, ongoing domain security for domains you own.
For most domain owners, the ideal setup includes DomainScan for monitoring and ViewDNS’s investigative tools for the occasional deep research task. If you’re only looking at one tool, the question is whether your use case is “investigate what happened historically” or “keep my domain healthy going forward.”