Build, calculate, and troubleshoot faster.
PacketToolbox combines production-focused networking tools with clear explanations, engineer insights, and export-ready results.
network 10.50.10.0/27
usable 10.50.10.1 - 10.50.10.30
broadcast 10.50.10.31
status ready for Cisco + Juniper
Start with the most-used workflows.
PacketToolbox includes 40 complete tools. The homepage highlights a focused set of frequently used utilities.
IPv4 Subnet Calculator
Calculate subnet details, ranges, wildcard masks, and deployment-ready values.
Open tool ->VLSM Planner
Create right-sized subnet plans with growth reserve and clean allocations.
Open tool ->Packet Flow Visualizer
Trace DNS, ARP, switching, and routing behavior hop by hop.
Open tool ->Cisco ACL Builder
Build ordered standard and extended ACLs with practical validation notes.
Open tool ->IPv6 Calculator
Analyze IPv6 prefix structure, compressed and expanded forms, and subnets.
Open tool ->OSPF Cost Calculator
Compute OSPF integer cost from reference and interface bandwidth.
Open tool ->Practical explanations, not textbook filler.
Each tool explains the calculation, important edge cases, and field considerations.
IP Addressing
Subnetting, VLSM, wildcard masks, CIDR, route summaries, and IPv6.
Routing
OSPF, BGP, EIGRP, prefix policies, route maps, and troubleshooting.
Switching
VLANs, spanning tree, port channels, first-hop redundancy, and PoE.
Physical
Fiber, optics, connectors, cable limits, link loss, and compatibility.
Built from field experience.
Fast answers for staging, design, validation, cutovers, and troubleshooting.