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NETWORK ENGINEERING • NOC OPERATIONS

20 Essential Network Tools. 100% Free.

Fast calculators and engineering helpers for IP addressing, routing, bandwidth, fiber, configuration and NOC operations.

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Top 20 Network Engineering Tools

Practical calculators for network engineers, NOC teams and IT operations.

IPv4

IPv4 Subnet Calculator

Calculate network, broadcast, usable host range, subnet mask and host capacity.
VLSM

VLSM Calculator

Allocate variable-length subnets from a parent IPv4 network based on host requirements.
CIDR

CIDR Range Calculator

Convert an IPv4 CIDR block to its network range, mask, broadcast and usable hosts.
↔

CIDR Overlap Checker

Check whether two IPv4 networks overlap and identify their address ranges.
✳

Wildcard Mask Calculator

Convert a CIDR prefix or subnet mask to a Cisco-style wildcard mask.
IPv6

IPv6 Calculator

Normalize, expand and calculate the network prefix for an IPv6 address.
MTTR

MTTR Calculator

Calculate mean, median, minimum and maximum restoration time from incident durations.
SLA

SLA Availability Calculator

Calculate availability percentage from a measurement period and total downtime.
⏱

Allowable Downtime Calculator

Find the maximum downtime allowed for a target SLA over any number of days.
INC

Incident Duration Calculator

Calculate elapsed incident time between two timestamps.
MOP

Maintenance Window Calculator

Calculate maintenance duration, planned work time and remaining rollback buffer.
BW

Bandwidth Calculator

Convert data transferred over time into bit rate and common network bandwidth units.
TX

Transfer Time Calculator

Estimate file transfer time using link speed and protocol efficiency.
OPT

Optical Power Budget Calculator

Estimate received optical power, total link loss and link margin.
dBm

dBm ↔ mW Converter

Convert optical or RF power between dBm and milliwatts.
FBR

Fiber Loss Calculator

Calculate expected total attenuation from fiber, connector and splice losses.
OSPF

OSPF Cost Calculator

Calculate OSPF interface cost from reference bandwidth and interface speed.
BGP

BGP AS Path Parser

Analyze AS-path length, unique ASNs, prepends, loops and private autonomous systems.
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Config Diff Tool

Compare two pasted network configurations and highlight added, removed and unchanged lines.
CFG

Config Generator (Cisco/Juniper)

Generate a basic routed interface configuration for Cisco IOS-XE or Juniper Junos.
BUILT FOR OPERATIONS

NOC calculations without spreadsheet gymnastics.

MTTR, SLA availability, downtime, incident duration and maintenance-window calculations are available from any browser. The tools are meant to speed up routine work while leaving the engineering judgment with you.

Read the NOC and engineering guides →
99.990%Example SLA availability
MTTR • Downtime • Maintenance • Incident Duration
LEARNING CENTER

Useful context behind the calculators

Short, practical guides written for engineers who want the reasoning as well as the result.

View all guides
IP Addressing

Planning IPv4 Address Space with VLSM

A practical way to allocate differently sized subnets, reduce waste and leave room for growth without painting the network into a corner.

8 min read

Network News & Engineering Updates

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IP & Routing

Subnetting, CIDR, wildcard masks, IPv6, OSPF and BGP helpers for everyday design and troubleshooting.

Fiber & Performance

Optical power budgets, fiber loss, dBm conversions, transfer time and bandwidth calculations.

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