Network Security Calculators

30 free network security calculators in Cyber Security.

ACL Rule CalculatorCount the access control entries a router or switch ACL will expand to and check it against the platform's TCAM budget.
ARP Spoofing Risk CalculatorScore ARP poisoning exposure in a VLAN from host count, dynamic ARP inspection coverage, port security and cache timeout.
DDoS Capacity CalculatorCompare scrubbing capacity against a modelled attack volume to see whether your DDoS headroom ratio actually holds.
DDoS Mitigation CalculatorAdd up detection, diversion and ramp time to find your true time to mitigate, and the traffic lost before it engages.
DMZ Capacity CalculatorPlan a DMZ: server count, addresses needed against the subnet size, VIP density per public IP and firewall rule load.
DNS Security CalculatorQuantify malicious DNS query volume, how much your RPZ feeds block, resolver headroom and amplification exposure.
DNSSEC CalculatorCalculate how much RRSIG and DNSKEY records inflate a DNS response, and whether it still fits UDP, EDNS0 or needs TCP.
East-West Security CalculatorMeasure lateral movement exposure inside a data centre: uninspected east-west traffic, exposed paths and agents still to deploy.
Firewall Capacity CalculatorDerate a firewall's datasheet throughput by inspection profile and size its session table memory against your peak load.
Firewall Rule Count CalculatorPredict how many firewall rules a zone-based policy needs, and how fast the rule base grows with each new security zone.
IDS Capacity CalculatorSize passive IDS sensors from mirrored traffic: packet rate, sensors required and full-packet-capture storage.
IPS Throughput CalculatorBlend plaintext and TLS-inspected traffic to find the real throughput an IPS delivers, in both bits and packets per second.
IPSec Overhead CalculatorBreak down ESP tunnel overhead byte by byte, find the encapsulated packet size and the largest inner MTU that fits.
MAC Spoofing Risk CalculatorAssess MAC spoofing and CAM table flooding exposure from port security coverage, 802.1X adoption and MAC table headroom.
Micro-Segmentation CalculatorCompare the worst-case n-squared policy count against your observed flows to size a micro-segmentation rollout.
NAT Session CalculatorWork out NAT and CGNAT port utilisation, the public IP pool size you need, and how close you are to port exhaustion.
Network Security Score CalculatorRoll segmentation, firewall hygiene, inspection, DDoS, VPN, DNS and monitoring into one weighted network security score.
Network Segmentation CalculatorDerive the number of network segments a design needs from trust levels, environments, tiers and host-count limits.
North-South Security CalculatorDerate a perimeter inspection stack stage by stage to find real capacity, added latency and unmonitored public endpoints.
Packet Inspection Capacity CalculatorSize deep packet inspection in packets per second: per-packet CPU cycle budget, cores required and nanoseconds per packet.
Port Scan Coverage CalculatorWork out how long a port scan takes at a given probe rate, and how much of the target range a scan window actually covers.
Proxy Throughput CalculatorTurn user counts into forward-proxy request rate, throughput, upstream bandwidth saved by caching and concurrent connections.
Reverse Proxy Security CalculatorModel WAF load on a reverse proxy: rule evaluations, CPU cores, TLS handshake utilisation, blocked traffic and false positives.
Security Group Coverage CalculatorAudit cloud security group hygiene: resource coverage, internet-open ingress rules, unused groups and a hygiene grade.
SSL Inspection CalculatorSize TLS interception: how much traffic you actually decrypt after bypass, and whether the device's derated capacity covers it.
SSL VPN Capacity CalculatorSize an SSL VPN gateway for reconnect storms, TLS throughput and session memory, and see which limit binds first.
Threat Detection Rate CalculatorApply Bayes to detection rates: turn true and false positive rates plus base rate into real alert precision and analyst load.
VPN Capacity CalculatorSize a VPN concentrator against aggregate encrypted bandwidth, tunnel count limits and the gateway count you need.
Web Proxy Capacity CalculatorSize a secure web gateway cluster: appliances required with N+1 sparing, users per node and access-log storage.
Zero Trust Readiness CalculatorScore your zero trust maturity across identity, device, network, application, data, visibility and automation pillars.