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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)10.201.112.0/23
network10.201.112.0/23
broadcast10.201.113.255
first host10.201.112.1
last host10.201.113.254
subnet mask255.255.254.0
wildcard0.0.1.255
addresses512
usable hosts510
classA
ipcalc 10.201.112.0/23
address00001010.11001001.01110000.00000000
subnet mask11111111.11111111.11111110.00000000
network00001010.11001001.01110000.00000000
broadcast00001010.11001001.01110001.11111111
green = network part, grey = host part
hex0x0ac97000
decimal180973568
reverse dns0.112.201.10.in-addr.arpa
ipv4-mapped::ffff:ac9:7000

/23 split into /29 · 64 subnets

close ×
#networkhost rangebroadcast
110.201.112.0/2910.201.112.1 – 10.201.112.610.201.112.7
210.201.112.8/2910.201.112.9 – 10.201.112.1410.201.112.15
310.201.112.16/2910.201.112.17 – 10.201.112.2210.201.112.23
410.201.112.24/2910.201.112.25 – 10.201.112.3010.201.112.31
510.201.112.32/2910.201.112.33 – 10.201.112.3810.201.112.39
610.201.112.40/2910.201.112.41 – 10.201.112.4610.201.112.47
710.201.112.48/2910.201.112.49 – 10.201.112.5410.201.112.55
810.201.112.56/2910.201.112.57 – 10.201.112.6210.201.112.63
910.201.112.64/2910.201.112.65 – 10.201.112.7010.201.112.71
1010.201.112.72/2910.201.112.73 – 10.201.112.7810.201.112.79
1110.201.112.80/2910.201.112.81 – 10.201.112.8610.201.112.87
1210.201.112.88/2910.201.112.89 – 10.201.112.9410.201.112.95
1310.201.112.96/2910.201.112.97 – 10.201.112.10210.201.112.103
1410.201.112.104/2910.201.112.105 – 10.201.112.11010.201.112.111
1510.201.112.112/2910.201.112.113 – 10.201.112.11810.201.112.119
1610.201.112.120/2910.201.112.121 – 10.201.112.12610.201.112.127
1710.201.112.128/2910.201.112.129 – 10.201.112.13410.201.112.135
1810.201.112.136/2910.201.112.137 – 10.201.112.14210.201.112.143
1910.201.112.144/2910.201.112.145 – 10.201.112.15010.201.112.151
2010.201.112.152/2910.201.112.153 – 10.201.112.15810.201.112.159
2110.201.112.160/2910.201.112.161 – 10.201.112.16610.201.112.167
2210.201.112.168/2910.201.112.169 – 10.201.112.17410.201.112.175
2310.201.112.176/2910.201.112.177 – 10.201.112.18210.201.112.183
2410.201.112.184/2910.201.112.185 – 10.201.112.19010.201.112.191
2510.201.112.192/2910.201.112.193 – 10.201.112.19810.201.112.199
2610.201.112.200/2910.201.112.201 – 10.201.112.20610.201.112.207
2710.201.112.208/2910.201.112.209 – 10.201.112.21410.201.112.215
2810.201.112.216/2910.201.112.217 – 10.201.112.22210.201.112.223
2910.201.112.224/2910.201.112.225 – 10.201.112.23010.201.112.231
3010.201.112.232/2910.201.112.233 – 10.201.112.23810.201.112.239
3110.201.112.240/2910.201.112.241 – 10.201.112.24610.201.112.247
3210.201.112.248/2910.201.112.249 – 10.201.112.25410.201.112.255
3310.201.113.0/2910.201.113.1 – 10.201.113.610.201.113.7
3410.201.113.8/2910.201.113.9 – 10.201.113.1410.201.113.15
3510.201.113.16/2910.201.113.17 – 10.201.113.2210.201.113.23
3610.201.113.24/2910.201.113.25 – 10.201.113.3010.201.113.31
3710.201.113.32/2910.201.113.33 – 10.201.113.3810.201.113.39
3810.201.113.40/2910.201.113.41 – 10.201.113.4610.201.113.47
3910.201.113.48/2910.201.113.49 – 10.201.113.5410.201.113.55
4010.201.113.56/2910.201.113.57 – 10.201.113.6210.201.113.63
4110.201.113.64/2910.201.113.65 – 10.201.113.7010.201.113.71
4210.201.113.72/2910.201.113.73 – 10.201.113.7810.201.113.79
4310.201.113.80/2910.201.113.81 – 10.201.113.8610.201.113.87
4410.201.113.88/2910.201.113.89 – 10.201.113.9410.201.113.95
4510.201.113.96/2910.201.113.97 – 10.201.113.10210.201.113.103
4610.201.113.104/2910.201.113.105 – 10.201.113.11010.201.113.111
4710.201.113.112/2910.201.113.113 – 10.201.113.11810.201.113.119
4810.201.113.120/2910.201.113.121 – 10.201.113.12610.201.113.127
4910.201.113.128/2910.201.113.129 – 10.201.113.13410.201.113.135
5010.201.113.136/2910.201.113.137 – 10.201.113.14210.201.113.143
5110.201.113.144/2910.201.113.145 – 10.201.113.15010.201.113.151
5210.201.113.152/2910.201.113.153 – 10.201.113.15810.201.113.159
5310.201.113.160/2910.201.113.161 – 10.201.113.16610.201.113.167
5410.201.113.168/2910.201.113.169 – 10.201.113.17410.201.113.175
5510.201.113.176/2910.201.113.177 – 10.201.113.18210.201.113.183
5610.201.113.184/2910.201.113.185 – 10.201.113.19010.201.113.191
5710.201.113.192/2910.201.113.193 – 10.201.113.19810.201.113.199
5810.201.113.200/2910.201.113.201 – 10.201.113.20610.201.113.207
5910.201.113.208/2910.201.113.209 – 10.201.113.21410.201.113.215
6010.201.113.216/2910.201.113.217 – 10.201.113.22210.201.113.223
6110.201.113.224/2910.201.113.225 – 10.201.113.23010.201.113.231
6210.201.113.232/2910.201.113.233 – 10.201.113.23810.201.113.239
6310.201.113.240/2910.201.113.241 – 10.201.113.24610.201.113.247
6410.201.113.248/2910.201.113.249 – 10.201.113.25410.201.113.255
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 →