2network
2network.appFree Network Tools for IT Professionals
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Features
Network & Security
Port Lookup
110+ ports with vulnerabilities, Wireshark filters, and NVD links
Subnet Calculator
CIDR to network, broadcast, host range, and usable hosts
DNS Lookup
Live queries via DoH with Google, Cloudflare, and Quad9 resolvers
SPF/DMARC/DKIM
Email security record builders with provider presets
Wildcard Mask
Subnet to wildcard conversion with Cisco ACL examples
VLSM Calculator
Multi-subnet allocation with efficiency optimization
HTTP Header Analyzer
Security header grading (A-F) for any URL
IP Geolocation
Location, ISP, and AS info with interactive map
How It Works
1
Choose a Tool
Choose a tool from the navigation menu (Ports, IP Tools, DNS Tools, Diagnostics)
2
Enter Your Query
Enter your query — results calculate instantly in your browser
3
Copy or Download
Copy results, download as .txt, or use the interactive reference tables