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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)10.1.232.0/23
network10.1.232.0/23
broadcast10.1.233.255
first host10.1.232.1
last host10.1.233.254
subnet mask255.255.254.0
wildcard0.0.1.255
addresses512
usable hosts510
classA
ipcalc 10.1.232.0/23
address00001010.00000001.11101000.00000000
subnet mask11111111.11111111.11111110.00000000
network00001010.00000001.11101000.00000000
broadcast00001010.00000001.11101001.11111111
green = network part, grey = host part
hex0x0a01e800
decimal167897088
reverse dns0.232.1.10.in-addr.arpa
ipv4-mapped::ffff:a01:e800

/23 split into /29 · 64 subnets

close ×
#networkhost rangebroadcast
110.1.232.0/2910.1.232.1 – 10.1.232.610.1.232.7
210.1.232.8/2910.1.232.9 – 10.1.232.1410.1.232.15
310.1.232.16/2910.1.232.17 – 10.1.232.2210.1.232.23
410.1.232.24/2910.1.232.25 – 10.1.232.3010.1.232.31
510.1.232.32/2910.1.232.33 – 10.1.232.3810.1.232.39
610.1.232.40/2910.1.232.41 – 10.1.232.4610.1.232.47
710.1.232.48/2910.1.232.49 – 10.1.232.5410.1.232.55
810.1.232.56/2910.1.232.57 – 10.1.232.6210.1.232.63
910.1.232.64/2910.1.232.65 – 10.1.232.7010.1.232.71
1010.1.232.72/2910.1.232.73 – 10.1.232.7810.1.232.79
1110.1.232.80/2910.1.232.81 – 10.1.232.8610.1.232.87
1210.1.232.88/2910.1.232.89 – 10.1.232.9410.1.232.95
1310.1.232.96/2910.1.232.97 – 10.1.232.10210.1.232.103
1410.1.232.104/2910.1.232.105 – 10.1.232.11010.1.232.111
1510.1.232.112/2910.1.232.113 – 10.1.232.11810.1.232.119
1610.1.232.120/2910.1.232.121 – 10.1.232.12610.1.232.127
1710.1.232.128/2910.1.232.129 – 10.1.232.13410.1.232.135
1810.1.232.136/2910.1.232.137 – 10.1.232.14210.1.232.143
1910.1.232.144/2910.1.232.145 – 10.1.232.15010.1.232.151
2010.1.232.152/2910.1.232.153 – 10.1.232.15810.1.232.159
2110.1.232.160/2910.1.232.161 – 10.1.232.16610.1.232.167
2210.1.232.168/2910.1.232.169 – 10.1.232.17410.1.232.175
2310.1.232.176/2910.1.232.177 – 10.1.232.18210.1.232.183
2410.1.232.184/2910.1.232.185 – 10.1.232.19010.1.232.191
2510.1.232.192/2910.1.232.193 – 10.1.232.19810.1.232.199
2610.1.232.200/2910.1.232.201 – 10.1.232.20610.1.232.207
2710.1.232.208/2910.1.232.209 – 10.1.232.21410.1.232.215
2810.1.232.216/2910.1.232.217 – 10.1.232.22210.1.232.223
2910.1.232.224/2910.1.232.225 – 10.1.232.23010.1.232.231
3010.1.232.232/2910.1.232.233 – 10.1.232.23810.1.232.239
3110.1.232.240/2910.1.232.241 – 10.1.232.24610.1.232.247
3210.1.232.248/2910.1.232.249 – 10.1.232.25410.1.232.255
3310.1.233.0/2910.1.233.1 – 10.1.233.610.1.233.7
3410.1.233.8/2910.1.233.9 – 10.1.233.1410.1.233.15
3510.1.233.16/2910.1.233.17 – 10.1.233.2210.1.233.23
3610.1.233.24/2910.1.233.25 – 10.1.233.3010.1.233.31
3710.1.233.32/2910.1.233.33 – 10.1.233.3810.1.233.39
3810.1.233.40/2910.1.233.41 – 10.1.233.4610.1.233.47
3910.1.233.48/2910.1.233.49 – 10.1.233.5410.1.233.55
4010.1.233.56/2910.1.233.57 – 10.1.233.6210.1.233.63
4110.1.233.64/2910.1.233.65 – 10.1.233.7010.1.233.71
4210.1.233.72/2910.1.233.73 – 10.1.233.7810.1.233.79
4310.1.233.80/2910.1.233.81 – 10.1.233.8610.1.233.87
4410.1.233.88/2910.1.233.89 – 10.1.233.9410.1.233.95
4510.1.233.96/2910.1.233.97 – 10.1.233.10210.1.233.103
4610.1.233.104/2910.1.233.105 – 10.1.233.11010.1.233.111
4710.1.233.112/2910.1.233.113 – 10.1.233.11810.1.233.119
4810.1.233.120/2910.1.233.121 – 10.1.233.12610.1.233.127
4910.1.233.128/2910.1.233.129 – 10.1.233.13410.1.233.135
5010.1.233.136/2910.1.233.137 – 10.1.233.14210.1.233.143
5110.1.233.144/2910.1.233.145 – 10.1.233.15010.1.233.151
5210.1.233.152/2910.1.233.153 – 10.1.233.15810.1.233.159
5310.1.233.160/2910.1.233.161 – 10.1.233.16610.1.233.167
5410.1.233.168/2910.1.233.169 – 10.1.233.17410.1.233.175
5510.1.233.176/2910.1.233.177 – 10.1.233.18210.1.233.183
5610.1.233.184/2910.1.233.185 – 10.1.233.19010.1.233.191
5710.1.233.192/2910.1.233.193 – 10.1.233.19810.1.233.199
5810.1.233.200/2910.1.233.201 – 10.1.233.20610.1.233.207
5910.1.233.208/2910.1.233.209 – 10.1.233.21410.1.233.215
6010.1.233.216/2910.1.233.217 – 10.1.233.22210.1.233.223
6110.1.233.224/2910.1.233.225 – 10.1.233.23010.1.233.231
6210.1.233.232/2910.1.233.233 – 10.1.233.23810.1.233.239
6310.1.233.240/2910.1.233.241 – 10.1.233.24610.1.233.247
6410.1.233.248/2910.1.233.249 – 10.1.233.25410.1.233.255
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 →