Networking Tools
11 free tools built for network engineers. No sign-up, no ads, no nonsense. All computation runs locally where possible.
Calculator
Subnet & CIDR Calculator
Enter any IP and prefix. Get network address, broadcast, host range, wildcard mask, binary breakdown, and a plain-English explanation of why this mask was chosen.
Calculator
VLSM Calculator
Give it a base network and your host requirements per subnet. Get optimal allocations automatically — largest first, zero waste. Includes address usage bar.
Lookup
IP & ASN Lookup
Paste any IP — get ASN, owner, country, ISP, coordinates. Automatically identifies private, bogon, and loopback ranges without an API call.
Visualizer
BGP Path Selection Visualizer
Add 2–6 BGP paths to the same prefix. See which path wins and exactly why — walking through all 13 BGP decision attributes in order.
Generator
BGP & OSPF Config Generator
Fill in your parameters, get a clean production config for Cisco IOS, IOS-XR, or Juniper JunOS. BGP, OSPF, and static routes.
Checklist
Troubleshooting Checklist
Pick your symptom — BGP down, can't ping, OSPF not forming. Get OSI-layer-by-layer steps with exact IOS commands. 20 years of debugging methodology.
Calculator
QoS & Bandwidth Calculator
Enter link speed and traffic classes. Get per-class bandwidth allocation, oversubscription warnings, and complete IOS policy-map and class-map config.
Builder
ACL Builder
Build standard and extended Cisco ACLs visually. Named or numbered, with remarks. Get clean IOS syntax ready to paste into the CLI.
Security
Cisco Password Hasher
Generate type-5 (MD5) and type-7 hashes for Cisco configs. 100% local — nothing leaves your browser. Includes password strength check.
Interactive
Certification Roadmap
Interactive visual paths from CCNA to CCIE, AWS Solutions Architect, and Python automation. Click any cert for exam cost, study hours, and what it covers.
Simulator
Ping & Traceroute Simulator
Educational simulator showing how ping and traceroute work — TTL mechanics, ICMP types, hop-by-hop path discovery with animated visualisation.
Photography
Exposure Triangle
Adjust aperture, shutter speed, and ISO. See EV, equivalent exposures, and what each setting does to your image — motion, DOF, noise.
Photography
Depth of Field Calculator
Enter focal length, aperture, sensor size, and subject distance. Get near/far focus limits, total DOF, hyperfocal distance, and visual focus zone.
Photography
ND Filter Calculator
Enter base exposure and ND filter strength. Get new shutter speed instantly. Stack multiple filters and see the combined stop value.
Photography
Golden Hour Calculator
Enter coordinates and date. Get exact golden hour, blue hour, sunrise, and sunset windows — with a visual 24-hour timeline and countdown to next shoot window.
Photography
Shot List Builder
Build a structured shot list before your shoot. Organize by type (aerial, portrait, detail), add notes, check off on location, and export to text.
Photography
Aspect Ratio & Crop Calculator
Enter source resolution and target ratio. See crop dimensions, megapixel loss, visual crop preview, and a table of all common output formats.
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More tools coming
Python NetOps snippets, LLM prompt library, cheatsheets. If you have a request, get in touch.