ip
ipku.in

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)10.1.24.0/23
network10.1.24.0/23
broadcast10.1.25.255
first host10.1.24.1
last host10.1.25.254
subnet mask255.255.254.0
wildcard0.0.1.255
addresses512
usable hosts510
classA
ipcalc 10.1.24.0/23
address00001010.00000001.00011000.00000000
subnet mask11111111.11111111.11111110.00000000
network00001010.00000001.00011000.00000000
broadcast00001010.00000001.00011001.11111111
green = network part, grey = host part
hex0x0a011800
decimal167843840
reverse dns0.24.1.10.in-addr.arpa
ipv4-mapped::ffff:a01:1800

/23 split into /29 · 64 subnets

close ×
#networkhost rangebroadcast
110.1.24.0/2910.1.24.1 – 10.1.24.610.1.24.7
210.1.24.8/2910.1.24.9 – 10.1.24.1410.1.24.15
310.1.24.16/2910.1.24.17 – 10.1.24.2210.1.24.23
410.1.24.24/2910.1.24.25 – 10.1.24.3010.1.24.31
510.1.24.32/2910.1.24.33 – 10.1.24.3810.1.24.39
610.1.24.40/2910.1.24.41 – 10.1.24.4610.1.24.47
710.1.24.48/2910.1.24.49 – 10.1.24.5410.1.24.55
810.1.24.56/2910.1.24.57 – 10.1.24.6210.1.24.63
910.1.24.64/2910.1.24.65 – 10.1.24.7010.1.24.71
1010.1.24.72/2910.1.24.73 – 10.1.24.7810.1.24.79
1110.1.24.80/2910.1.24.81 – 10.1.24.8610.1.24.87
1210.1.24.88/2910.1.24.89 – 10.1.24.9410.1.24.95
1310.1.24.96/2910.1.24.97 – 10.1.24.10210.1.24.103
1410.1.24.104/2910.1.24.105 – 10.1.24.11010.1.24.111
1510.1.24.112/2910.1.24.113 – 10.1.24.11810.1.24.119
1610.1.24.120/2910.1.24.121 – 10.1.24.12610.1.24.127
1710.1.24.128/2910.1.24.129 – 10.1.24.13410.1.24.135
1810.1.24.136/2910.1.24.137 – 10.1.24.14210.1.24.143
1910.1.24.144/2910.1.24.145 – 10.1.24.15010.1.24.151
2010.1.24.152/2910.1.24.153 – 10.1.24.15810.1.24.159
2110.1.24.160/2910.1.24.161 – 10.1.24.16610.1.24.167
2210.1.24.168/2910.1.24.169 – 10.1.24.17410.1.24.175
2310.1.24.176/2910.1.24.177 – 10.1.24.18210.1.24.183
2410.1.24.184/2910.1.24.185 – 10.1.24.19010.1.24.191
2510.1.24.192/2910.1.24.193 – 10.1.24.19810.1.24.199
2610.1.24.200/2910.1.24.201 – 10.1.24.20610.1.24.207
2710.1.24.208/2910.1.24.209 – 10.1.24.21410.1.24.215
2810.1.24.216/2910.1.24.217 – 10.1.24.22210.1.24.223
2910.1.24.224/2910.1.24.225 – 10.1.24.23010.1.24.231
3010.1.24.232/2910.1.24.233 – 10.1.24.23810.1.24.239
3110.1.24.240/2910.1.24.241 – 10.1.24.24610.1.24.247
3210.1.24.248/2910.1.24.249 – 10.1.24.25410.1.24.255
3310.1.25.0/2910.1.25.1 – 10.1.25.610.1.25.7
3410.1.25.8/2910.1.25.9 – 10.1.25.1410.1.25.15
3510.1.25.16/2910.1.25.17 – 10.1.25.2210.1.25.23
3610.1.25.24/2910.1.25.25 – 10.1.25.3010.1.25.31
3710.1.25.32/2910.1.25.33 – 10.1.25.3810.1.25.39
3810.1.25.40/2910.1.25.41 – 10.1.25.4610.1.25.47
3910.1.25.48/2910.1.25.49 – 10.1.25.5410.1.25.55
4010.1.25.56/2910.1.25.57 – 10.1.25.6210.1.25.63
4110.1.25.64/2910.1.25.65 – 10.1.25.7010.1.25.71
4210.1.25.72/2910.1.25.73 – 10.1.25.7810.1.25.79
4310.1.25.80/2910.1.25.81 – 10.1.25.8610.1.25.87
4410.1.25.88/2910.1.25.89 – 10.1.25.9410.1.25.95
4510.1.25.96/2910.1.25.97 – 10.1.25.10210.1.25.103
4610.1.25.104/2910.1.25.105 – 10.1.25.11010.1.25.111
4710.1.25.112/2910.1.25.113 – 10.1.25.11810.1.25.119
4810.1.25.120/2910.1.25.121 – 10.1.25.12610.1.25.127
4910.1.25.128/2910.1.25.129 – 10.1.25.13410.1.25.135
5010.1.25.136/2910.1.25.137 – 10.1.25.14210.1.25.143
5110.1.25.144/2910.1.25.145 – 10.1.25.15010.1.25.151
5210.1.25.152/2910.1.25.153 – 10.1.25.15810.1.25.159
5310.1.25.160/2910.1.25.161 – 10.1.25.16610.1.25.167
5410.1.25.168/2910.1.25.169 – 10.1.25.17410.1.25.175
5510.1.25.176/2910.1.25.177 – 10.1.25.18210.1.25.183
5610.1.25.184/2910.1.25.185 – 10.1.25.19010.1.25.191
5710.1.25.192/2910.1.25.193 – 10.1.25.19810.1.25.199
5810.1.25.200/2910.1.25.201 – 10.1.25.20610.1.25.207
5910.1.25.208/2910.1.25.209 – 10.1.25.21410.1.25.215
6010.1.25.216/2910.1.25.217 – 10.1.25.22210.1.25.223
6110.1.25.224/2910.1.25.225 – 10.1.25.23010.1.25.231
6210.1.25.232/2910.1.25.233 – 10.1.25.23810.1.25.239
6310.1.25.240/2910.1.25.241 – 10.1.25.24610.1.25.247
6410.1.25.248/2910.1.25.249 – 10.1.25.25410.1.25.255
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 →