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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)10.1.158.0/23
network10.1.158.0/23
broadcast10.1.159.255
first host10.1.158.1
last host10.1.159.254
subnet mask255.255.254.0
wildcard0.0.1.255
addresses512
usable hosts510
classA
ipcalc 10.1.158.0/23
address00001010.00000001.10011110.00000000
subnet mask11111111.11111111.11111110.00000000
network00001010.00000001.10011110.00000000
broadcast00001010.00000001.10011111.11111111
green = network part, grey = host part
hex0x0a019e00
decimal167878144
reverse dns0.158.1.10.in-addr.arpa
ipv4-mapped::ffff:a01:9e00

/23 split into /29 · 64 subnets

close ×
#networkhost rangebroadcast
110.1.158.0/2910.1.158.1 – 10.1.158.610.1.158.7
210.1.158.8/2910.1.158.9 – 10.1.158.1410.1.158.15
310.1.158.16/2910.1.158.17 – 10.1.158.2210.1.158.23
410.1.158.24/2910.1.158.25 – 10.1.158.3010.1.158.31
510.1.158.32/2910.1.158.33 – 10.1.158.3810.1.158.39
610.1.158.40/2910.1.158.41 – 10.1.158.4610.1.158.47
710.1.158.48/2910.1.158.49 – 10.1.158.5410.1.158.55
810.1.158.56/2910.1.158.57 – 10.1.158.6210.1.158.63
910.1.158.64/2910.1.158.65 – 10.1.158.7010.1.158.71
1010.1.158.72/2910.1.158.73 – 10.1.158.7810.1.158.79
1110.1.158.80/2910.1.158.81 – 10.1.158.8610.1.158.87
1210.1.158.88/2910.1.158.89 – 10.1.158.9410.1.158.95
1310.1.158.96/2910.1.158.97 – 10.1.158.10210.1.158.103
1410.1.158.104/2910.1.158.105 – 10.1.158.11010.1.158.111
1510.1.158.112/2910.1.158.113 – 10.1.158.11810.1.158.119
1610.1.158.120/2910.1.158.121 – 10.1.158.12610.1.158.127
1710.1.158.128/2910.1.158.129 – 10.1.158.13410.1.158.135
1810.1.158.136/2910.1.158.137 – 10.1.158.14210.1.158.143
1910.1.158.144/2910.1.158.145 – 10.1.158.15010.1.158.151
2010.1.158.152/2910.1.158.153 – 10.1.158.15810.1.158.159
2110.1.158.160/2910.1.158.161 – 10.1.158.16610.1.158.167
2210.1.158.168/2910.1.158.169 – 10.1.158.17410.1.158.175
2310.1.158.176/2910.1.158.177 – 10.1.158.18210.1.158.183
2410.1.158.184/2910.1.158.185 – 10.1.158.19010.1.158.191
2510.1.158.192/2910.1.158.193 – 10.1.158.19810.1.158.199
2610.1.158.200/2910.1.158.201 – 10.1.158.20610.1.158.207
2710.1.158.208/2910.1.158.209 – 10.1.158.21410.1.158.215
2810.1.158.216/2910.1.158.217 – 10.1.158.22210.1.158.223
2910.1.158.224/2910.1.158.225 – 10.1.158.23010.1.158.231
3010.1.158.232/2910.1.158.233 – 10.1.158.23810.1.158.239
3110.1.158.240/2910.1.158.241 – 10.1.158.24610.1.158.247
3210.1.158.248/2910.1.158.249 – 10.1.158.25410.1.158.255
3310.1.159.0/2910.1.159.1 – 10.1.159.610.1.159.7
3410.1.159.8/2910.1.159.9 – 10.1.159.1410.1.159.15
3510.1.159.16/2910.1.159.17 – 10.1.159.2210.1.159.23
3610.1.159.24/2910.1.159.25 – 10.1.159.3010.1.159.31
3710.1.159.32/2910.1.159.33 – 10.1.159.3810.1.159.39
3810.1.159.40/2910.1.159.41 – 10.1.159.4610.1.159.47
3910.1.159.48/2910.1.159.49 – 10.1.159.5410.1.159.55
4010.1.159.56/2910.1.159.57 – 10.1.159.6210.1.159.63
4110.1.159.64/2910.1.159.65 – 10.1.159.7010.1.159.71
4210.1.159.72/2910.1.159.73 – 10.1.159.7810.1.159.79
4310.1.159.80/2910.1.159.81 – 10.1.159.8610.1.159.87
4410.1.159.88/2910.1.159.89 – 10.1.159.9410.1.159.95
4510.1.159.96/2910.1.159.97 – 10.1.159.10210.1.159.103
4610.1.159.104/2910.1.159.105 – 10.1.159.11010.1.159.111
4710.1.159.112/2910.1.159.113 – 10.1.159.11810.1.159.119
4810.1.159.120/2910.1.159.121 – 10.1.159.12610.1.159.127
4910.1.159.128/2910.1.159.129 – 10.1.159.13410.1.159.135
5010.1.159.136/2910.1.159.137 – 10.1.159.14210.1.159.143
5110.1.159.144/2910.1.159.145 – 10.1.159.15010.1.159.151
5210.1.159.152/2910.1.159.153 – 10.1.159.15810.1.159.159
5310.1.159.160/2910.1.159.161 – 10.1.159.16610.1.159.167
5410.1.159.168/2910.1.159.169 – 10.1.159.17410.1.159.175
5510.1.159.176/2910.1.159.177 – 10.1.159.18210.1.159.183
5610.1.159.184/2910.1.159.185 – 10.1.159.19010.1.159.191
5710.1.159.192/2910.1.159.193 – 10.1.159.19810.1.159.199
5810.1.159.200/2910.1.159.201 – 10.1.159.20610.1.159.207
5910.1.159.208/2910.1.159.209 – 10.1.159.21410.1.159.215
6010.1.159.216/2910.1.159.217 – 10.1.159.22210.1.159.223
6110.1.159.224/2910.1.159.225 – 10.1.159.23010.1.159.231
6210.1.159.232/2910.1.159.233 – 10.1.159.23810.1.159.239
6310.1.159.240/2910.1.159.241 – 10.1.159.24610.1.159.247
6410.1.159.248/2910.1.159.249 – 10.1.159.25410.1.159.255
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 →