Subnet CalculatorBrowser-local network tool
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Subnet calculator for IPv4 and IPv6

Type an address with /prefix or a dotted netmask. Network, broadcast, host range, wildcard mask and binary update as you type, and you can split the network by subnet count or hosts per subnet.

Try:

Network

192.168.1.0/24

192.168.1.1 – 192.168.1.254

IPv4Private (RFC 1918)Class C

Usable hosts

254

Details

Address
192.168.1.10
Network
192.168.1.0
Broadcast
192.168.1.255
First host
192.168.1.1
Last host
192.168.1.254
Total addresses
256
Netmask
255.255.255.0
Wildcard mask
0.0.0.255
Hex netmask
0xFFFFFF00
Reverse DNS
10.1.168.192.in-addr.arpa

Binary

Network bitsHost bits

Address

11000000.10101000.00000001.00001010

Network

11000000.10101000.00000001.00000000

Netmask

11111111.11111111.11111111.00000000

Broadcast

11000000.10101000.00000001.11111111

24 network bits, 8 host bits

Split into subnets

Divide this network into equal subnets by how many you need or by hosts per subnet.

4 × /26, 62 usable hosts each

#SubnetHost rangeBroadcast
1192.168.1.0/26192.168.1.1 – 192.168.1.62192.168.1.63
2192.168.1.64/26192.168.1.65 – 192.168.1.126192.168.1.127
3192.168.1.128/26192.168.1.129 – 192.168.1.190192.168.1.191
4192.168.1.192/26192.168.1.193 – 192.168.1.254192.168.1.255

Common tasks

  • subnet calculator
  • ip subnet calculator
  • cidr calculator
  • netmask calculator
  • ipv6 subnet calculator
  • wildcard mask calculator
  • 子网掩码计算器

Quick answer

Enter an IP with /prefix or a netmask, e.g. 192.168.1.10/24. The calculator shows network 192.168.1.0, broadcast 192.168.1.255, hosts .1 to .254 (254 usable), netmask 255.255.255.0 and wildcard 0.0.0.255.

How to use

  1. 1. Enter the addressType 10.0.0.1/22, 10.0.0.1 255.255.252.0 or an IPv6 prefix such as 2001:db8::/48.
  2. 2. Read the resultsNetwork, broadcast, host range and masks update instantly; copy any value.
  3. 3. Split if neededChoose number of subnets or hosts per subnet to get the subnet list.

Common use cases

  • Plan VLANs and office subnets
  • Check which addresses a firewall rule or ACL covers
  • Convert between CIDR and dotted masks for router configs
  • Size cloud VPC and subnet ranges

Features

  • CIDR and dotted netmask input, including wildcard masks
  • Network, broadcast, first and last host, usable and total addresses
  • Netmask, wildcard, hex mask and reverse DNS name
  • Binary view with network and host bits highlighted
  • Split by number of subnets or hosts per subnet
  • IPv6 prefixes with expanded and compressed notation

Related tools

IP Range ↔ CIDRConvert IP ranges to the minimal CIDR list, merge and de-duplicate CIDR blocks, and check DNS LookupLook up A, AAAA, CNAME, MX, TXT, NS, SOA, CAA, PTR and more over DNS-over-HTTPS with CloudPort LookupSearch common TCP and UDP port numbers by number, range or service: SSH 22, HTTPS 443, RDP

Frequently asked questions

How many usable hosts does a /24 have?
256 addresses minus network and broadcast, so 254 usable hosts.
Why do /31 and /32 show no broadcast?
RFC 3021 lets /31 point-to-point links use both addresses, and /32 is a single host, so neither has a broadcast address.
What is a wildcard mask?
The inverse of the netmask, used by Cisco ACLs and OSPF. 255.255.255.0 becomes 0.0.0.255.
Is my input sent anywhere?
No. All calculations run in your browser.