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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)10.232.18.0/23
network10.232.18.0/23
broadcast10.232.19.255
first host10.232.18.1
last host10.232.19.254
subnet mask255.255.254.0
wildcard0.0.1.255
addresses512
usable hosts510
classA
ipcalc 10.232.18.0/23
address00001010.11101000.00010010.00000000
subnet mask11111111.11111111.11111110.00000000
network00001010.11101000.00010010.00000000
broadcast00001010.11101000.00010011.11111111
green = network part, grey = host part
hex0x0ae81200
decimal182981120
reverse dns0.18.232.10.in-addr.arpa
ipv4-mapped::ffff:ae8:1200

/23 split into /29 · 64 subnets

close ×
#networkhost rangebroadcast
110.232.18.0/2910.232.18.1 – 10.232.18.610.232.18.7
210.232.18.8/2910.232.18.9 – 10.232.18.1410.232.18.15
310.232.18.16/2910.232.18.17 – 10.232.18.2210.232.18.23
410.232.18.24/2910.232.18.25 – 10.232.18.3010.232.18.31
510.232.18.32/2910.232.18.33 – 10.232.18.3810.232.18.39
610.232.18.40/2910.232.18.41 – 10.232.18.4610.232.18.47
710.232.18.48/2910.232.18.49 – 10.232.18.5410.232.18.55
810.232.18.56/2910.232.18.57 – 10.232.18.6210.232.18.63
910.232.18.64/2910.232.18.65 – 10.232.18.7010.232.18.71
1010.232.18.72/2910.232.18.73 – 10.232.18.7810.232.18.79
1110.232.18.80/2910.232.18.81 – 10.232.18.8610.232.18.87
1210.232.18.88/2910.232.18.89 – 10.232.18.9410.232.18.95
1310.232.18.96/2910.232.18.97 – 10.232.18.10210.232.18.103
1410.232.18.104/2910.232.18.105 – 10.232.18.11010.232.18.111
1510.232.18.112/2910.232.18.113 – 10.232.18.11810.232.18.119
1610.232.18.120/2910.232.18.121 – 10.232.18.12610.232.18.127
1710.232.18.128/2910.232.18.129 – 10.232.18.13410.232.18.135
1810.232.18.136/2910.232.18.137 – 10.232.18.14210.232.18.143
1910.232.18.144/2910.232.18.145 – 10.232.18.15010.232.18.151
2010.232.18.152/2910.232.18.153 – 10.232.18.15810.232.18.159
2110.232.18.160/2910.232.18.161 – 10.232.18.16610.232.18.167
2210.232.18.168/2910.232.18.169 – 10.232.18.17410.232.18.175
2310.232.18.176/2910.232.18.177 – 10.232.18.18210.232.18.183
2410.232.18.184/2910.232.18.185 – 10.232.18.19010.232.18.191
2510.232.18.192/2910.232.18.193 – 10.232.18.19810.232.18.199
2610.232.18.200/2910.232.18.201 – 10.232.18.20610.232.18.207
2710.232.18.208/2910.232.18.209 – 10.232.18.21410.232.18.215
2810.232.18.216/2910.232.18.217 – 10.232.18.22210.232.18.223
2910.232.18.224/2910.232.18.225 – 10.232.18.23010.232.18.231
3010.232.18.232/2910.232.18.233 – 10.232.18.23810.232.18.239
3110.232.18.240/2910.232.18.241 – 10.232.18.24610.232.18.247
3210.232.18.248/2910.232.18.249 – 10.232.18.25410.232.18.255
3310.232.19.0/2910.232.19.1 – 10.232.19.610.232.19.7
3410.232.19.8/2910.232.19.9 – 10.232.19.1410.232.19.15
3510.232.19.16/2910.232.19.17 – 10.232.19.2210.232.19.23
3610.232.19.24/2910.232.19.25 – 10.232.19.3010.232.19.31
3710.232.19.32/2910.232.19.33 – 10.232.19.3810.232.19.39
3810.232.19.40/2910.232.19.41 – 10.232.19.4610.232.19.47
3910.232.19.48/2910.232.19.49 – 10.232.19.5410.232.19.55
4010.232.19.56/2910.232.19.57 – 10.232.19.6210.232.19.63
4110.232.19.64/2910.232.19.65 – 10.232.19.7010.232.19.71
4210.232.19.72/2910.232.19.73 – 10.232.19.7810.232.19.79
4310.232.19.80/2910.232.19.81 – 10.232.19.8610.232.19.87
4410.232.19.88/2910.232.19.89 – 10.232.19.9410.232.19.95
4510.232.19.96/2910.232.19.97 – 10.232.19.10210.232.19.103
4610.232.19.104/2910.232.19.105 – 10.232.19.11010.232.19.111
4710.232.19.112/2910.232.19.113 – 10.232.19.11810.232.19.119
4810.232.19.120/2910.232.19.121 – 10.232.19.12610.232.19.127
4910.232.19.128/2910.232.19.129 – 10.232.19.13410.232.19.135
5010.232.19.136/2910.232.19.137 – 10.232.19.14210.232.19.143
5110.232.19.144/2910.232.19.145 – 10.232.19.15010.232.19.151
5210.232.19.152/2910.232.19.153 – 10.232.19.15810.232.19.159
5310.232.19.160/2910.232.19.161 – 10.232.19.16610.232.19.167
5410.232.19.168/2910.232.19.169 – 10.232.19.17410.232.19.175
5510.232.19.176/2910.232.19.177 – 10.232.19.18210.232.19.183
5610.232.19.184/2910.232.19.185 – 10.232.19.19010.232.19.191
5710.232.19.192/2910.232.19.193 – 10.232.19.19810.232.19.199
5810.232.19.200/2910.232.19.201 – 10.232.19.20610.232.19.207
5910.232.19.208/2910.232.19.209 – 10.232.19.21410.232.19.215
6010.232.19.216/2910.232.19.217 – 10.232.19.22210.232.19.223
6110.232.19.224/2910.232.19.225 – 10.232.19.23010.232.19.231
6210.232.19.232/2910.232.19.233 – 10.232.19.23810.232.19.239
6310.232.19.240/2910.232.19.241 – 10.232.19.24610.232.19.247
6410.232.19.248/2910.232.19.249 – 10.232.19.25410.232.19.255
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 →