Browse by task
Offline Network Engineering Tools
Follow the engineering workflow from requirements and design through build, acceptance, and operations. Prepare calculations, check pasted evidence, and export review results locally. Every tool also works as a downloadable standalone HTML file.
01 / Requirements & capacity
Translate demand and service targets into capacity and downtime budgets.
- Network Capacity PlannerTurn application demand, concurrency, growth, and utilization targets into a shared uplink requirement.
- Availability & Downtime BudgetCalculate an availability target’s downtime allowance and remaining budget from outage durations.
- Network Transfer Time CalculatorEstimate transfer duration from data size, line rate, and assumed effective utilization.
- Required Bandwidth CalculatorCalculate the line rate needed to finish a backup or transfer within a specified window.
02 / Address & link design
Plan address space, segmentation, transport windows, and physical link margins.
- IP Range Overlap CheckerCompare existing and planned IPv4 ranges to find overlaps before connecting networks.
- TCP Window & BDP CalculatorCalculate bandwidth-delay product and the ideal throughput ceiling imposed by a receive window.
- Optical Link Budget CalculatorCheck minimum receive power, engineering margin, and receiver overload from supplied optical specifications.
- IPv4 Subnet CalculatorCalculate network boundaries, masks, host ranges, and /31 point-to-point addresses.
- VLSM Subnet PlannerAllocate non-overlapping LAN subnets from a parent network using required host counts.
- CIDR Aggregator & Range ConverterConvert IPv4 ranges to CIDRs and merge adjacent or duplicate networks without adding addresses.
- CIDR Exclusion CalculatorSubtract IPv4 exceptions from network lists and export the exact remaining CIDRs.
- IP Network Membership CheckerCheck which IPv4 addresses belong to supplied networks, with every matching range shown.
- IPv6 Subnet & Address CalculatorNormalize IPv6 text and calculate prefix boundaries and exact address counts.
- VLAN & IP Plan CheckerCheck a VLAN plan for duplicate IDs, overlapping subnets, and invalid gateway addresses.
- Subnet & Wildcard Mask ConverterConvert between IPv4 prefix lengths, contiguous subnet masks, and inverse wildcard masks.
- MTU & TCP MSS CalculatorCalculate inner MTU, advertised TCP MSS, and payload budget with explicit encapsulation overhead.
03 / Build & change review
Prepare service records and scopes, verify traffic requirements, and review proposed changes.
- DHCP Pool PlannerRemove gateways, reservations, and exclusions from a LAN scope and check dynamic lease capacity.
- DNS Record Builder & CheckerCreate A, AAAA, CNAME, and MX record lines from a spreadsheet and catch conflicting aliases.
- Firewall Communication Matrix CheckerCompare a spreadsheet of expected traffic decisions with ordered IPv4 rules and export every mismatch.
- Network Configuration DiffCompare ordered configuration lines before and after a change, with original line numbers for review.
- IPv4 Traffic Rule CheckerEvaluate an IPv4 packet against a simplified ordered rule list and identify the first matching rule.
- Reverse DNS Name GeneratorGenerate in-addr.arpa and ip6.arpa owner names from IPv4 and IPv6 addresses.
04 / Testing & acceptance
Prepare focused captures and check test evidence against agreed thresholds.
05 / Operations & troubleshooting
Inspect interface load and route selection, normalize addresses, and prepare logs for handover.
- Interface Counter Delta AnalyzerCalculate per-direction throughput and utilization from two 32-bit or 64-bit octet-counter snapshots.
- Route Longest Prefix MatchFind the longest matching IPv4 routes and show equally specific next-hop candidates.
- MAC Address NormalizerConvert 48-bit MAC addresses to colon, hyphen, and Cisco formats and inspect address bits.
- Network Address RedactorReplace recognized IPv4, IPv6, MAC addresses, and specified hostnames with consistent labels in logs.
- IPv4 Address ExtractorExtract and validate IPv4 addresses.