SubnetCalc Pro

• SUBNET CALCULATOR (IPv4 & IPv6)
Calculate network addresses, broadcast, host ranges and more. Smart IP input field with automatic octet separation, number keyboard, and auto-jump. Binary view with color highlighting (network bits blue, host bits green).

• IP OWNER LOOKUP
Discover who owns an IP address. Shows organization, ISP, ASN, location on map (MapKit) and more. Auto-search after 1 second. Multi-API with fallback (IP-API.com, ipapi.co, ipinfo.io). 24h offline cache.

• VLSM CALCULATOR
Plan complex subnet structures. Automatic calculation of optimal CIDR values. IP shortage warning. Export as PDF or CSV. History of last 10 plans.

• SUBNET REFERENCE
Complete table of all subnet masks (/0 to /32). Search/filter function. Favorite stars for frequently used masks.

• NETWORK TOOLS
- HTTP Ping: Test connectivity with real response times
- Port Scanner: Scan common ports (SSH, HTTP, HTTPS, RDP, MySQL)
- DNS Lookup: Domain resolution via Google DNS
- IP Batch Scanner: Scan IP ranges, CSV export