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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)10.167.12.0/23
network10.167.12.0/23
broadcast10.167.13.255
first host10.167.12.1
last host10.167.13.254
subnet mask255.255.254.0
wildcard0.0.1.255
addresses512
usable hosts510
classA
ipcalc 10.167.12.0/23
address00001010.10100111.00001100.00000000
subnet mask11111111.11111111.11111110.00000000
network00001010.10100111.00001100.00000000
broadcast00001010.10100111.00001101.11111111
green = network part, grey = host part
hex0x0aa70c00
decimal178719744
reverse dns0.12.167.10.in-addr.arpa
ipv4-mapped::ffff:aa7:c00

/23 split into /29 · 64 subnets

close ×
#networkhost rangebroadcast
110.167.12.0/2910.167.12.1 – 10.167.12.610.167.12.7
210.167.12.8/2910.167.12.9 – 10.167.12.1410.167.12.15
310.167.12.16/2910.167.12.17 – 10.167.12.2210.167.12.23
410.167.12.24/2910.167.12.25 – 10.167.12.3010.167.12.31
510.167.12.32/2910.167.12.33 – 10.167.12.3810.167.12.39
610.167.12.40/2910.167.12.41 – 10.167.12.4610.167.12.47
710.167.12.48/2910.167.12.49 – 10.167.12.5410.167.12.55
810.167.12.56/2910.167.12.57 – 10.167.12.6210.167.12.63
910.167.12.64/2910.167.12.65 – 10.167.12.7010.167.12.71
1010.167.12.72/2910.167.12.73 – 10.167.12.7810.167.12.79
1110.167.12.80/2910.167.12.81 – 10.167.12.8610.167.12.87
1210.167.12.88/2910.167.12.89 – 10.167.12.9410.167.12.95
1310.167.12.96/2910.167.12.97 – 10.167.12.10210.167.12.103
1410.167.12.104/2910.167.12.105 – 10.167.12.11010.167.12.111
1510.167.12.112/2910.167.12.113 – 10.167.12.11810.167.12.119
1610.167.12.120/2910.167.12.121 – 10.167.12.12610.167.12.127
1710.167.12.128/2910.167.12.129 – 10.167.12.13410.167.12.135
1810.167.12.136/2910.167.12.137 – 10.167.12.14210.167.12.143
1910.167.12.144/2910.167.12.145 – 10.167.12.15010.167.12.151
2010.167.12.152/2910.167.12.153 – 10.167.12.15810.167.12.159
2110.167.12.160/2910.167.12.161 – 10.167.12.16610.167.12.167
2210.167.12.168/2910.167.12.169 – 10.167.12.17410.167.12.175
2310.167.12.176/2910.167.12.177 – 10.167.12.18210.167.12.183
2410.167.12.184/2910.167.12.185 – 10.167.12.19010.167.12.191
2510.167.12.192/2910.167.12.193 – 10.167.12.19810.167.12.199
2610.167.12.200/2910.167.12.201 – 10.167.12.20610.167.12.207
2710.167.12.208/2910.167.12.209 – 10.167.12.21410.167.12.215
2810.167.12.216/2910.167.12.217 – 10.167.12.22210.167.12.223
2910.167.12.224/2910.167.12.225 – 10.167.12.23010.167.12.231
3010.167.12.232/2910.167.12.233 – 10.167.12.23810.167.12.239
3110.167.12.240/2910.167.12.241 – 10.167.12.24610.167.12.247
3210.167.12.248/2910.167.12.249 – 10.167.12.25410.167.12.255
3310.167.13.0/2910.167.13.1 – 10.167.13.610.167.13.7
3410.167.13.8/2910.167.13.9 – 10.167.13.1410.167.13.15
3510.167.13.16/2910.167.13.17 – 10.167.13.2210.167.13.23
3610.167.13.24/2910.167.13.25 – 10.167.13.3010.167.13.31
3710.167.13.32/2910.167.13.33 – 10.167.13.3810.167.13.39
3810.167.13.40/2910.167.13.41 – 10.167.13.4610.167.13.47
3910.167.13.48/2910.167.13.49 – 10.167.13.5410.167.13.55
4010.167.13.56/2910.167.13.57 – 10.167.13.6210.167.13.63
4110.167.13.64/2910.167.13.65 – 10.167.13.7010.167.13.71
4210.167.13.72/2910.167.13.73 – 10.167.13.7810.167.13.79
4310.167.13.80/2910.167.13.81 – 10.167.13.8610.167.13.87
4410.167.13.88/2910.167.13.89 – 10.167.13.9410.167.13.95
4510.167.13.96/2910.167.13.97 – 10.167.13.10210.167.13.103
4610.167.13.104/2910.167.13.105 – 10.167.13.11010.167.13.111
4710.167.13.112/2910.167.13.113 – 10.167.13.11810.167.13.119
4810.167.13.120/2910.167.13.121 – 10.167.13.12610.167.13.127
4910.167.13.128/2910.167.13.129 – 10.167.13.13410.167.13.135
5010.167.13.136/2910.167.13.137 – 10.167.13.14210.167.13.143
5110.167.13.144/2910.167.13.145 – 10.167.13.15010.167.13.151
5210.167.13.152/2910.167.13.153 – 10.167.13.15810.167.13.159
5310.167.13.160/2910.167.13.161 – 10.167.13.16610.167.13.167
5410.167.13.168/2910.167.13.169 – 10.167.13.17410.167.13.175
5510.167.13.176/2910.167.13.177 – 10.167.13.18210.167.13.183
5610.167.13.184/2910.167.13.185 – 10.167.13.19010.167.13.191
5710.167.13.192/2910.167.13.193 – 10.167.13.19810.167.13.199
5810.167.13.200/2910.167.13.201 – 10.167.13.20610.167.13.207
5910.167.13.208/2910.167.13.209 – 10.167.13.21410.167.13.215
6010.167.13.216/2910.167.13.217 – 10.167.13.22210.167.13.223
6110.167.13.224/2910.167.13.225 – 10.167.13.23010.167.13.231
6210.167.13.232/2910.167.13.233 – 10.167.13.23810.167.13.239
6310.167.13.240/2910.167.13.241 – 10.167.13.24610.167.13.247
6410.167.13.248/2910.167.13.249 – 10.167.13.25410.167.13.255
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 →