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)10.0.250.0/23
network10.0.250.0/23
broadcast10.0.251.255
first host10.0.250.1
last host10.0.251.254
subnet mask255.255.254.0
wildcard0.0.1.255
addresses512
usable hosts510
classA
ipcalc 10.0.250.0/23
address00001010.00000000.11111010.00000000
subnet mask11111111.11111111.11111110.00000000
network00001010.00000000.11111010.00000000
broadcast00001010.00000000.11111011.11111111
green = network part, grey = host part
hex0x0a00fa00
decimal167836160
reverse dns0.250.0.10.in-addr.arpa
ipv4-mapped::ffff:a00:fa00

/23 split into /29 · 64 subnets

close ×
#networkhost rangebroadcast
110.0.250.0/2910.0.250.1 – 10.0.250.610.0.250.7
210.0.250.8/2910.0.250.9 – 10.0.250.1410.0.250.15
310.0.250.16/2910.0.250.17 – 10.0.250.2210.0.250.23
410.0.250.24/2910.0.250.25 – 10.0.250.3010.0.250.31
510.0.250.32/2910.0.250.33 – 10.0.250.3810.0.250.39
610.0.250.40/2910.0.250.41 – 10.0.250.4610.0.250.47
710.0.250.48/2910.0.250.49 – 10.0.250.5410.0.250.55
810.0.250.56/2910.0.250.57 – 10.0.250.6210.0.250.63
910.0.250.64/2910.0.250.65 – 10.0.250.7010.0.250.71
1010.0.250.72/2910.0.250.73 – 10.0.250.7810.0.250.79
1110.0.250.80/2910.0.250.81 – 10.0.250.8610.0.250.87
1210.0.250.88/2910.0.250.89 – 10.0.250.9410.0.250.95
1310.0.250.96/2910.0.250.97 – 10.0.250.10210.0.250.103
1410.0.250.104/2910.0.250.105 – 10.0.250.11010.0.250.111
1510.0.250.112/2910.0.250.113 – 10.0.250.11810.0.250.119
1610.0.250.120/2910.0.250.121 – 10.0.250.12610.0.250.127
1710.0.250.128/2910.0.250.129 – 10.0.250.13410.0.250.135
1810.0.250.136/2910.0.250.137 – 10.0.250.14210.0.250.143
1910.0.250.144/2910.0.250.145 – 10.0.250.15010.0.250.151
2010.0.250.152/2910.0.250.153 – 10.0.250.15810.0.250.159
2110.0.250.160/2910.0.250.161 – 10.0.250.16610.0.250.167
2210.0.250.168/2910.0.250.169 – 10.0.250.17410.0.250.175
2310.0.250.176/2910.0.250.177 – 10.0.250.18210.0.250.183
2410.0.250.184/2910.0.250.185 – 10.0.250.19010.0.250.191
2510.0.250.192/2910.0.250.193 – 10.0.250.19810.0.250.199
2610.0.250.200/2910.0.250.201 – 10.0.250.20610.0.250.207
2710.0.250.208/2910.0.250.209 – 10.0.250.21410.0.250.215
2810.0.250.216/2910.0.250.217 – 10.0.250.22210.0.250.223
2910.0.250.224/2910.0.250.225 – 10.0.250.23010.0.250.231
3010.0.250.232/2910.0.250.233 – 10.0.250.23810.0.250.239
3110.0.250.240/2910.0.250.241 – 10.0.250.24610.0.250.247
3210.0.250.248/2910.0.250.249 – 10.0.250.25410.0.250.255
3310.0.251.0/2910.0.251.1 – 10.0.251.610.0.251.7
3410.0.251.8/2910.0.251.9 – 10.0.251.1410.0.251.15
3510.0.251.16/2910.0.251.17 – 10.0.251.2210.0.251.23
3610.0.251.24/2910.0.251.25 – 10.0.251.3010.0.251.31
3710.0.251.32/2910.0.251.33 – 10.0.251.3810.0.251.39
3810.0.251.40/2910.0.251.41 – 10.0.251.4610.0.251.47
3910.0.251.48/2910.0.251.49 – 10.0.251.5410.0.251.55
4010.0.251.56/2910.0.251.57 – 10.0.251.6210.0.251.63
4110.0.251.64/2910.0.251.65 – 10.0.251.7010.0.251.71
4210.0.251.72/2910.0.251.73 – 10.0.251.7810.0.251.79
4310.0.251.80/2910.0.251.81 – 10.0.251.8610.0.251.87
4410.0.251.88/2910.0.251.89 – 10.0.251.9410.0.251.95
4510.0.251.96/2910.0.251.97 – 10.0.251.10210.0.251.103
4610.0.251.104/2910.0.251.105 – 10.0.251.11010.0.251.111
4710.0.251.112/2910.0.251.113 – 10.0.251.11810.0.251.119
4810.0.251.120/2910.0.251.121 – 10.0.251.12610.0.251.127
4910.0.251.128/2910.0.251.129 – 10.0.251.13410.0.251.135
5010.0.251.136/2910.0.251.137 – 10.0.251.14210.0.251.143
5110.0.251.144/2910.0.251.145 – 10.0.251.15010.0.251.151
5210.0.251.152/2910.0.251.153 – 10.0.251.15810.0.251.159
5310.0.251.160/2910.0.251.161 – 10.0.251.16610.0.251.167
5410.0.251.168/2910.0.251.169 – 10.0.251.17410.0.251.175
5510.0.251.176/2910.0.251.177 – 10.0.251.18210.0.251.183
5610.0.251.184/2910.0.251.185 – 10.0.251.19010.0.251.191
5710.0.251.192/2910.0.251.193 – 10.0.251.19810.0.251.199
5810.0.251.200/2910.0.251.201 – 10.0.251.20610.0.251.207
5910.0.251.208/2910.0.251.209 – 10.0.251.21410.0.251.215
6010.0.251.216/2910.0.251.217 – 10.0.251.22210.0.251.223
6110.0.251.224/2910.0.251.225 – 10.0.251.23010.0.251.231
6210.0.251.232/2910.0.251.233 – 10.0.251.23810.0.251.239
6310.0.251.240/2910.0.251.241 – 10.0.251.24610.0.251.247
6410.0.251.248/2910.0.251.249 – 10.0.251.25410.0.251.255
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 →