Network Engineering
& Security Tools.
Free network engineering and cybersecurity tools — subnet calculator, DNS lookup, IP reputation, RF link budget, CVE lookup, and 20+ more. Built for real-world engineering work.
27
Tools
5
Disciplines
19
Free Tools
8
Pro Tools
Five disciplines.
One platform.
Network Engineering
Map your infrastructure.
DNS security analysis, BGP routing intelligence, WHOIS auditing, MAC vendor identification, and subnet planning.
- DNS Security Analysis
- BGP / ASN Intelligence
- WHOIS Domain Auditing
- MAC Vendor Identification
- Subnet & VLSM Planning
Threat Intelligence
Know your threat surface.
IP reputation, CVE vulnerability lookup, subdomain enumeration, and passive OSINT recon from certificate transparency logs.
- Domain Intelligence (Full Scan)
- IP Reputation & Threat Flags
- CVE Vulnerability Lookup
- Subdomain Enumeration
- WHOIS & Registrar Audit
Pen Testing & Recon
Detect threats. Audit exposure.
URL and phishing detection, port exposure scanning, password breach checking, and active recon for authorized security assessments.
- URL & Phishing Detection
- Port Exposure Analysis
- Password Breach Check
- SSL Certificate Auditing
- Email Header Forensics
RF Engineering
ProEngineer RF links.
RF link budget calculation, Friis path loss, antenna gain analysis, and throughput-vs-distance charts for real-world deployments.
- Link Budget Calculation
- Friis Path Loss Equation
- Antenna Gain Analysis
- Signal Margin Assessment
- Throughput-vs-Distance Charts
Artificial Intelligence
FreeUnderstand AI's impact.
Visualize AI automation risk across 342 US occupations. Find resilient careers, explore sector exposure, and plan your future using BLS data.
- AI Job Exposure Treemap
- Occupation Risk Scoring
- Best Careers Recommendations
- Career Path Guides
- Education & Pay Breakdowns
The tools engineers reach for first.
Subnet Calculator
Calculate network address, broadcast, subnet mask, wildcard mask, usable hosts, and IP class from any CIDR block.
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DNS Lookup
Query all DNS record types and analyze SPF, DKIM, and DMARC email security policies in a single lookup.
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BGP / ASN Lookup
Map any IP to its controlling autonomous system, cloud provider, routing prefixes, and peering relationships.
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IP Reputation Lookup
Check any IP address against live threat intelligence feeds and get an abuse score with risk context.
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WHOIS Lookup
Retrieve domain registration details, registrar info, name servers, and DNSSEC status for any domain.
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CVE Lookup
Search the NVD database for CVEs by ID or keyword. Get CVSS scores, affected software, and remediation guidance.
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SSL Certificate Checker
Inspect TLS certificates for expiry, chain validity, issuer details, and SANs for any hostname.
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Subdomain Finder
Enumerate subdomains via certificate transparency logs and DNS brute-forcing to map your attack surface.
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AI Job Exposure Map
Interactive treemap of AI automation risk across 800+ US occupations, scored by BLS employment data.
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Intelligence, not just data.
CyrusX interprets raw network data and surfaces what actually matters — risk levels, cloud providers, security gaps, and actionable context.
Lookup tools.
Reimagined as intelligence.
Most tools just surface raw data. CyrusX interprets it — classifying ASNs, detecting cloud providers, scoring security risk, and explaining what it all means.
- →Automatic risk scoring on every IP and domain lookup
- →Cloud provider detection across AWS, GCP, Azure, Cloudflare
- →Email security analysis — SPF, DMARC, and DKIM in one view
- →Domain security audit — DNSSEC, transfer locks, expiry risk
AS15169 — Google LLC
Google LLC · Hyperscaler / CDN
AS15169
ASN
Hyperscaler
Type
248
Prefixes
312
Peers
• Operated by Google LLC
• Hyperscalers are globally trusted infrastructure
• Low risk — expected in normal web and cloud traffic
Routing Prefixes · IPv4
$ dns-lookup google.com
Querying DNS records...
✓ A records resolved (4 addresses)
✓ MX records found (5 mail servers)
✓ TXT records scanned
✓ DMARC policy detected
⚠ DKIM: not detected for common selectors
Email Security Analysis
SPF ✅ Valid (strict) — v=spf1 include:_spf.google.com ~all
DMARC ✅ Enforced (reject) — p=reject
DKIM ⚠ Not detected for common selectors
Domain Info
Hosting Google Cloud DNS
IP Geo Mountain View, CA, US
ASN AS15169 · Google LLC
$ █
From lookup
to security audit.
CyrusX DNS goes beyond record queries. It analyzes SPF, DMARC, and DKIM email security, detects cloud hosting providers, shows TTL insights, and discovers common subdomains — all in a single lookup.
7
Record types
3
Email security checks
11
Subdomains scanned
13+
Cloud providers detected
⚡ Domain Intelligence.
One scan. Full picture.
Stop running 6 separate tools on the same domain. Domain Intelligence combines WHOIS, DNS, SSL, IP reputation, subdomains, threat signals, and port exposure into a single unified report — with a risk score, final verdict, and recommended actions.
- →Unified risk score weighted across all data sources
- →Final verdict with decisive, actionable findings
- →Lookalike brand detection — catch typosquatting instantly
- →Exposure & attack surface analysis (Pro)
- →Save reports to your dashboard
Sample scan — cyrusx.io
AI Job Exposure Map.
See what AI is replacing.
Interactive treemap of 342 US occupations scored by AI automation risk. Area = employment size. Color = exposure level. Filter by category, search by role, or explore the Best Careers tab for data-backed recommendations.
- →342 occupations scored 0–10 by AI exposure
- →Weighted average, histogram, and education breakdown
- →Best Careers tab — ranked by low exposure + job growth + pay
- →Career Path guide — steps, certifications, salary progression
Get Started
Start analyzing
your network.
27 tools across 5 disciplines. No signup required for free tier. Pro unlocks Domain Intelligence, advanced engineering tools, unlimited lookups, and RF analysis.
Free tier includes 19 tools. No credit card required.
FAQ
Common questions
What is CyrusX?+
CyrusX is a free engineering and security toolkit for network engineers, RF designers, security professionals, and anyone navigating AI's impact on the workforce. It provides 27 tools across five disciplines: network engineering, threat intelligence & OSINT, pen testing & recon, RF engineering, and artificial intelligence.
Is CyrusX free to use?+
Yes. 19 CyrusX tools are completely free with no account required — including the new AI Job Exposure Map. A Pro plan ($9.99/month) unlocks 8 advanced tools including Domain Intelligence, port scanner, bulk IP lookup, VLSM calculator, RF link budget, network scanner, and more — along with unlimited lookups on all rate-limited tools.
What tools does CyrusX offer?+
CyrusX offers 27 tools including: Subnet Calculator, IP to Binary Converter, DNS Lookup, MAC Lookup, BGP/ASN Lookup, Ping, IP Reputation, WHOIS, CVE Lookup, Subdomain Finder, URL Scanner, Password Breach Checker, Email Header Analyzer, HTTP Headers Inspector, SSL Certificate Checker, JWT Decoder, Hash Generator, Base64 Encoder/Decoder, AI Job Exposure Map, Domain Intelligence (Pro), Port Scanner (Pro), Bulk IP Lookup (Pro), Advanced Subnet Breakdown (Pro), VLSM Calculator (Pro), RF Link Budget (Pro), Network Dashboard (Pro), and Network Scanner (Pro).
Who is CyrusX designed for?+
CyrusX is designed for network engineers, security analysts, penetration testers, bug bounty hunters, SOC analysts, RF and wireless engineers, sysadmins, IT professionals, and anyone researching AI's impact on the job market.
How does the DNS Lookup tool work?+
The CyrusX DNS Lookup tool queries Google's public DNS resolver for any domain and record type — including A, AAAA, MX, TXT, NS, CNAME, SOA, PTR, SRV, CAA, DS, and DNSKEY records. It also analyzes email security protocols (SPF, DMARC, DKIM) and flags missing or misconfigured records.
What is the RF Link Budget tool?+
The RF Link Budget tool calculates free-space path loss, received signal power, and link margin for wireless communication systems. It supports custom frequency, transmit power, antenna gains, and cable losses — useful for planning point-to-point microwave links, Wi-Fi networks, and satellite systems.
Does CyrusX store my data?+
CyrusX does not store or log the IPs, domains, or URLs you look up. Saved calculations are stored securely in your account and can be deleted at any time. CyrusX does not sell or share your data with third parties.