SubnetCalc Pro

IPv4/IPv6 CIDR Supernetting Calculator & Reverse DNS Generator

Network architect's subnet planning and CIDR supernetting station. Calculates network addresses, broadcast boundaries, usable host ranges, and wildcard masks for IPv4 and IPv6 networks, generating reverse DNS zone records and ACL rules.

Purchase License ($19.99) Open Live Web Portal

Real Desktop Application Screens • Captured from the Running Program

100% Native Executable Node-Lock Verified

Head-to-Head Competitor Analysis

Why SubnetCalc Pro is cheaper, faster, and more secure than SolarWinds IP Subnet Calculator ($295/yr).

Comparison Metric	SubnetCalc Pro	SolarWinds IP Subnet Calculator ($295/yr)
License Model & Price	$19.99 (One-Time Perpetual)	$295/year bundled in engineer toolset
Annual Financial Savings	Save $275/yr every single year
Competitor Drawbacks	Expensive recurring subscription, bloated Windows installer, invasive sales calls and email marketing
Why Vivian Is Better	One-time $19.99 perpetual license, lightweight 8MB standalone native binary, instant IPv6 + VLSM calculation
Execution Environment	100% Offline Air-Gapped	Mandatory cloud check-in
Runtime Telemetry	Zero Telemetry (0.00KB sent)	Cloud telemetry & user tracking

Engineering Specifications & Features

Complete IPv4 and IPv6 CIDR calculation (/0 through /32 for IPv4, /0 through /128 for IPv6)

Visual bit-boundary map showing Network, Subnet, and Host bit allocations

VLSM (Variable Length Subnet Masking) tree planner optimizing subnet allocation without wasted IP space

Reverse DNS zone generator outputting in-addr.arpa and ip6.arpa PTR record templates

Cisco, Juniper, and iptables access control list (ACL) wildcard mask generator

Subnet overlap and conflict checker auditing existing IP address assignment spreadsheets

Graphical Interface (GUI) Architecture

IP address and CIDR prefix input with instant bit visualization bar, subnet breakdown table, VLSM hierarchical tree, and one-click copy buttons.

Headless CLI Reference & Execution

SubnetCalc Pro includes a headless command-line binary ready for automation pipelines, cron daemons, and CI/CD runners:

# Headless command execution:
subnetcalc --calc-sample --cidr '192.168.0.0/22' --split 24 --gen-reverse-dns
# Cryptographic node-lock activation:
subnetcalc --activate YOUR-CROCKFORD-KEY

Core Architecture & Asymmetric Security

Deterministic C++ networking algorithm with 128-bit integer arithmetic for instantaneous IPv6 supernet calculations.