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IPv4 Subnet Calculator

Enter an IP with a CIDR prefix or a subnet mask to see its network, broadcast, host range, and host count. You can also split the network into smaller subnets.

$ ipcalc
Try:192.168.1.10/2410.0.0.0/8172.16.5.4/20203.0.113.9/29
IPv6 calculator →
private IP (RFC 1918)10.131.40.0/23
network10.131.40.0/23
broadcast10.131.41.255
first host10.131.40.1
last host10.131.41.254
subnet mask255.255.254.0
wildcard0.0.1.255
addresses512
usable hosts510
classA
ipcalc 10.131.40.0/23
address00001010.10000011.00101000.00000000
subnet mask11111111.11111111.11111110.00000000
network00001010.10000011.00101000.00000000
broadcast00001010.10000011.00101001.11111111
green = network part, grey = host part
hex0x0a832800
decimal176367616
reverse dns0.40.131.10.in-addr.arpa
ipv4-mapped::ffff:a83:2800

/23 split into /29 · 64 subnets

close ×
#networkhost rangebroadcast
110.131.40.0/2910.131.40.1 – 10.131.40.610.131.40.7
210.131.40.8/2910.131.40.9 – 10.131.40.1410.131.40.15
310.131.40.16/2910.131.40.17 – 10.131.40.2210.131.40.23
410.131.40.24/2910.131.40.25 – 10.131.40.3010.131.40.31
510.131.40.32/2910.131.40.33 – 10.131.40.3810.131.40.39
610.131.40.40/2910.131.40.41 – 10.131.40.4610.131.40.47
710.131.40.48/2910.131.40.49 – 10.131.40.5410.131.40.55
810.131.40.56/2910.131.40.57 – 10.131.40.6210.131.40.63
910.131.40.64/2910.131.40.65 – 10.131.40.7010.131.40.71
1010.131.40.72/2910.131.40.73 – 10.131.40.7810.131.40.79
1110.131.40.80/2910.131.40.81 – 10.131.40.8610.131.40.87
1210.131.40.88/2910.131.40.89 – 10.131.40.9410.131.40.95
1310.131.40.96/2910.131.40.97 – 10.131.40.10210.131.40.103
1410.131.40.104/2910.131.40.105 – 10.131.40.11010.131.40.111
1510.131.40.112/2910.131.40.113 – 10.131.40.11810.131.40.119
1610.131.40.120/2910.131.40.121 – 10.131.40.12610.131.40.127
1710.131.40.128/2910.131.40.129 – 10.131.40.13410.131.40.135
1810.131.40.136/2910.131.40.137 – 10.131.40.14210.131.40.143
1910.131.40.144/2910.131.40.145 – 10.131.40.15010.131.40.151
2010.131.40.152/2910.131.40.153 – 10.131.40.15810.131.40.159
2110.131.40.160/2910.131.40.161 – 10.131.40.16610.131.40.167
2210.131.40.168/2910.131.40.169 – 10.131.40.17410.131.40.175
2310.131.40.176/2910.131.40.177 – 10.131.40.18210.131.40.183
2410.131.40.184/2910.131.40.185 – 10.131.40.19010.131.40.191
2510.131.40.192/2910.131.40.193 – 10.131.40.19810.131.40.199
2610.131.40.200/2910.131.40.201 – 10.131.40.20610.131.40.207
2710.131.40.208/2910.131.40.209 – 10.131.40.21410.131.40.215
2810.131.40.216/2910.131.40.217 – 10.131.40.22210.131.40.223
2910.131.40.224/2910.131.40.225 – 10.131.40.23010.131.40.231
3010.131.40.232/2910.131.40.233 – 10.131.40.23810.131.40.239
3110.131.40.240/2910.131.40.241 – 10.131.40.24610.131.40.247
3210.131.40.248/2910.131.40.249 – 10.131.40.25410.131.40.255
3310.131.41.0/2910.131.41.1 – 10.131.41.610.131.41.7
3410.131.41.8/2910.131.41.9 – 10.131.41.1410.131.41.15
3510.131.41.16/2910.131.41.17 – 10.131.41.2210.131.41.23
3610.131.41.24/2910.131.41.25 – 10.131.41.3010.131.41.31
3710.131.41.32/2910.131.41.33 – 10.131.41.3810.131.41.39
3810.131.41.40/2910.131.41.41 – 10.131.41.4610.131.41.47
3910.131.41.48/2910.131.41.49 – 10.131.41.5410.131.41.55
4010.131.41.56/2910.131.41.57 – 10.131.41.6210.131.41.63
4110.131.41.64/2910.131.41.65 – 10.131.41.7010.131.41.71
4210.131.41.72/2910.131.41.73 – 10.131.41.7810.131.41.79
4310.131.41.80/2910.131.41.81 – 10.131.41.8610.131.41.87
4410.131.41.88/2910.131.41.89 – 10.131.41.9410.131.41.95
4510.131.41.96/2910.131.41.97 – 10.131.41.10210.131.41.103
4610.131.41.104/2910.131.41.105 – 10.131.41.11010.131.41.111
4710.131.41.112/2910.131.41.113 – 10.131.41.11810.131.41.119
4810.131.41.120/2910.131.41.121 – 10.131.41.12610.131.41.127
4910.131.41.128/2910.131.41.129 – 10.131.41.13410.131.41.135
5010.131.41.136/2910.131.41.137 – 10.131.41.14210.131.41.143
5110.131.41.144/2910.131.41.145 – 10.131.41.15010.131.41.151
5210.131.41.152/2910.131.41.153 – 10.131.41.15810.131.41.159
5310.131.41.160/2910.131.41.161 – 10.131.41.16610.131.41.167
5410.131.41.168/2910.131.41.169 – 10.131.41.17410.131.41.175
5510.131.41.176/2910.131.41.177 – 10.131.41.18210.131.41.183
5610.131.41.184/2910.131.41.185 – 10.131.41.19010.131.41.191
5710.131.41.192/2910.131.41.193 – 10.131.41.19810.131.41.199
5810.131.41.200/2910.131.41.201 – 10.131.41.20610.131.41.207
5910.131.41.208/2910.131.41.209 – 10.131.41.21410.131.41.215
6010.131.41.216/2910.131.41.217 – 10.131.41.22210.131.41.223
6110.131.41.224/2910.131.41.225 – 10.131.41.23010.131.41.231
6210.131.41.232/2910.131.41.233 – 10.131.41.23810.131.41.239
6310.131.41.240/2910.131.41.241 – 10.131.41.24610.131.41.247
6410.131.41.248/2910.131.41.249 – 10.131.41.25410.131.41.255
01 / table

IPv4 CIDR prefix table.

Click a prefix longer than your network to split it into subnets.

prefixsubnet maskaddresseshostsin your /23
/00.0.0.04,294,967,2964,294,967,294-
/1128.0.0.02,147,483,6482,147,483,646-
/2192.0.0.01,073,741,8241,073,741,822-
/3224.0.0.0536,870,912536,870,910-
/4240.0.0.0268,435,456268,435,454-
/5248.0.0.0134,217,728134,217,726-
/6252.0.0.067,108,86467,108,862-
/7254.0.0.033,554,43233,554,430-
/8255.0.0.016,777,21616,777,214-
/9255.128.0.08,388,6088,388,606-
/10255.192.0.04,194,3044,194,302-
/11255.224.0.02,097,1522,097,150-
/12255.240.0.01,048,5761,048,574-
/13255.248.0.0524,288524,286-
/14255.252.0.0262,144262,142-
/15255.254.0.0131,072131,070-
/16255.255.0.065,53665,534-
/17255.255.128.032,76832,766-
/18255.255.192.016,38416,382-
/19255.255.224.08,1928,190-
/20255.255.240.04,0964,094-
/21255.255.248.02,0482,046-
/22255.255.252.01,0241,022-
/23255.255.254.05125101
/24255.255.255.02562542 split →
/25255.255.255.1281281264 split →
/26255.255.255.19264628 split →
/27255.255.255.224323016 split →
/28255.255.255.240161432 split →
/29255.255.255.2488664 split →
/30255.255.255.25242128 split →
/31255.255.255.25422256 split →
/32255.255.255.25511512 split →
02 / faq

About this calculator.

How do I use this subnet calculator?

▼

Type an IP address followed by a prefix, like 192.168.1.10/24, or by a subnet mask, like 192.168.1.10 255.255.255.0. Without a prefix it uses /24. Click a row in the table to split the network into smaller subnets.

Why are usable hosts always 2 fewer?

▼

The first address in a subnet is the network address and the last is the broadcast address, so neither can go to a device. The exceptions are /31 (point-to-point links, RFC 3021) and /32 (a single address), which use every address.

Can I use it from a terminal?

▼

Yes. curl 'ipku.in/en/tools/ipv4-subnet-calculator?q=192.168.1.10/24' returns the result as plain text.

Learn how to work it out →