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Developer & IT

Subnet Calculator

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Developer & IT

Subnet Calculator

Live answer192.168.10.0/24Mask 255.255.255.0 · wildcard 0.0.0.255 · broadcast 192.168.10.255 · usable range 192.168.10.1 to 192.168.10.254 · 254 usable host address(es)
Live result192.168.10.0/24Mask 255.255.255.0 · wildcard 0.0.0.255 · broadcast 192.168.10.255 · usable range 192.168.10.1 to 192.168.10.254 · 254 usable host address(es)
Formula used

Address integer = octets packed into 32 bits. Mask = first prefix bits set to 1. Network = address AND mask. Broadcast = network OR inverted mask. Usable hosts = 2^(32 − prefix) − 2 for ordinary prefixes.

This is the method behind the answer, so the result can be checked rather than simply trusted.

Live math canvas

Your numbers, formula and explanation together

Subnet Calculator: 192.168.10.0/24. Mask 255.255.255.0 · wildcard 0.0.0.255 · broadcast 192.168.10.255 · usable range 192.168.10.1 to 192.168.10.254 · 254 usable host address(es)

Formula applied

The exact method behind this answer

CalculationTime keeps the method visible so the number can be checked instead of blindly trusted.

Address integer = octets packed into 32 bits. Mask = first prefix bits set to 1. Network = address AND mask. Broadcast = network OR inverted mask. Usable hosts = 2^(32 − prefix) − 2 for ordinary prefixes.
  1. Apply the formulaAddress integer = octets packed into 32 bits. Mask = first prefix bits set to 1. Network = address AND mask. Broadcast = network OR inverted mask. Usable hosts = 2^(32 − prefix) − 2 for ordinary prefixes.192.168.10.0/24Mask 255.255.255.0 · wildcard 0.0.0.255 · broadcast 192.168.10.255 · usable range 192.168.10.1 to 192.168.10.254 · 254 usable host address(es)

Your live breakdown

Current inputs in the calculation

These values come from the controls above and update when the calculator changes.

IP octet 1
192
First IPv4 octet.
IP octet 2
168
Second IPv4 octet.
IP octet 3
10
Third IPv4 octet.
IP octet 4
25
Fourth IPv4 octet.
CIDR prefix
24 /n
Use 24 for a common 255.255.255.0 network.

Resulting answer

192.168.10.0/24

Mask 255.255.255.0 · wildcard 0.0.0.255 · broadcast 192.168.10.255 · usable range 192.168.10.1 to 192.168.10.254 · 254 usable host address(es)

Answer
192.168.10.0/24
Live support
Mask 255.255.255.0 · wildcard 0.0.0.255 · broadcast 192.168.10.255 · usable range 192.168.10.1 to 192.168.10.254 · 254 usable host address(es)

Assumptions used

What this answer assumes

Best for quick CIDR checks, network documentation and ACL planning notes.

  • IPv4 only; IPv6 is not modelled.
  • /31 and /32 networks have special point-to-point or host-route behaviour, so usable host notes differ.
  • Routing policy, VLANs, NAT, DHCP scopes and firewall rules are outside the arithmetic.

Master’s Tip

How to use the result well

Master’s Tip: print the wildcard mask beside the subnet mask when handing a network note to someone writing ACLs.

Printable record

What belongs in the saved calculation

Save the inputs, result, formula, assumptions, page URL and date together so the calculation can be reviewed later.

IP octet 1
192
First IPv4 octet.
IP octet 2
168
Second IPv4 octet.
IP octet 3
10
Third IPv4 octet.
IP octet 4
25
Fourth IPv4 octet.

Visual grid

This number is one point on a larger pattern

Subnet is not just a final answer. It is a step on a line: before and after, input and output, assumption and result.

Micro-timehours, minutes, shiftsHuman scaledays, weeks, projectsMacro-timemonths, years, calendars
InputFormulaResult
192.168.10.0/24

CalculationTime keeps the path visible: the input, the method and the final number belong together.

CalculationTime

Subnet Calculation Report

Report date:

192.168.10.0/24Mask 255.255.255.0 · wildcard 0.0.0.255 · broadcast 192.168.10.255 · usable range 192.168.10.1 to 192.168.10.254 · 254 usable host address(es)

Inputs

IP octet 1
192
IP octet 2
168
IP octet 3
10
IP octet 4
25
CIDR prefix
24 /n

Method

Address integer = octets packed into 32 bits. Mask = first prefix bits set to 1. Network = address AND mask. Broadcast = network OR inverted mask. Usable hosts = 2^(32 − prefix) − 2 for ordinary prefixes.

  1. 192.168.10.25/24 has mask 255.255.255.0, network 192.168.10.0, broadcast 192.168.10.255 and ordinary usable host range 192.168.10.1 to 192.168.10.254.

Assumptions

  • IPv4 only; IPv6 is not modelled.
  • /31 and /32 networks have special point-to-point or host-route behaviour, so usable host notes differ.
  • Routing policy, VLANs, NAT, DHCP scopes and firewall rules are outside the arithmetic.

Notes

Use this space on the printed report for client, supplier, classroom, job-location, measurement, quote or approval notes.

Source: https://www.calculationtime.com/calculators/subnet-calculator

This report shows the calculation inputs, formula, assumptions and result for review. It is not legal, payroll, tax, engineering, financial or academic advice unless a qualified professional confirms the applicable rules.