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WEB & JARINGAN

Kalkulator Subnet IP (IPv4 & IPv6)

Masukkan alamat IP dan notasi CIDR atau subnet mask untuk menghitung alamat jaringan (network address), broadcast, rentang host valid, dan jumlah host yang dapat digunakan.

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IPv4 CIDR

Initial support for IPv4.

Subnet

Mask
255.255.255.0
Network
192.168.1.0
Broadcast
192.168.1.255
First host
192.168.1.1
Last host
192.168.1.254
Addresses
256
Usable hosts
254

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Apa itu Kalkulator Subnet IP (IPv4 & IPv6)?

Enter an IPv4 CIDR block to see the subnet mask, network address, broadcast address, host range, and address counts.

PAHAMI CARA KERJA ALAT

How to calculate IPv4 subnets

CIDR input

Use the format address/prefix, such as 192.168.1.10/24. Each octet must be between 0 and 255, and the prefix length must be between 0 and 32.

Host ranges

For most subnets, the first usable host is one address after the network and the last usable host is one before broadcast. /31 is treated as a two-address point-to-point link, and /32 as a single host route.

What to use it for

  • Check network and broadcast addresses before configuring a device.
  • Estimate usable host capacity for an IPv4 subnet.
  • Verify whether a CIDR block is too broad or too narrow for a planned range.

CIDR example

Mask
cidr = 24 -> 255.255.255.0
Usable hosts
/24 -> 2^(32 - 24) - 2

192.168.1.10/24

Network is 192.168.1.0, broadcast is 192.168.1.255, and usable hosts run from .1 to .254.

2^8 - 2 = 254 usable hosts

Subnet notes

The calculator covers IPv4 CIDR only. IPv6 planning needs a different subnet model and is not part of this tool.

Pertanyaan yang Sering Diajukan (FAQ)

Does it support IPv6?

No. This version is focused on IPv4 CIDR blocks.

Why does /31 show two usable hosts?

A /31 is commonly used for point-to-point links under RFC 3021, where both addresses can be used.

What does /32 mean?

It represents exactly one IPv4 address, often used as a host route.

Can I enter a range without CIDR?

No. Enter one IPv4 address with a CIDR prefix, such as 10.0.0.15/28.

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