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)10.37.184.0/23
network10.37.184.0/23
broadcast10.37.185.255
first host10.37.184.1
last host10.37.185.254
subnet mask255.255.254.0
wildcard0.0.1.255
addresses512
usable hosts510
classA
ipcalc 10.37.184.0/23
address00001010.00100101.10111000.00000000
subnet mask11111111.11111111.11111110.00000000
network00001010.00100101.10111000.00000000
broadcast00001010.00100101.10111001.11111111
green = network part, grey = host part
hex0x0a25b800
decimal170244096
reverse dns0.184.37.10.in-addr.arpa
ipv4-mapped::ffff:a25:b800

/23 split into /29 · 64 subnets

close ×
#networkhost rangebroadcast
110.37.184.0/2910.37.184.1 – 10.37.184.610.37.184.7
210.37.184.8/2910.37.184.9 – 10.37.184.1410.37.184.15
310.37.184.16/2910.37.184.17 – 10.37.184.2210.37.184.23
410.37.184.24/2910.37.184.25 – 10.37.184.3010.37.184.31
510.37.184.32/2910.37.184.33 – 10.37.184.3810.37.184.39
610.37.184.40/2910.37.184.41 – 10.37.184.4610.37.184.47
710.37.184.48/2910.37.184.49 – 10.37.184.5410.37.184.55
810.37.184.56/2910.37.184.57 – 10.37.184.6210.37.184.63
910.37.184.64/2910.37.184.65 – 10.37.184.7010.37.184.71
1010.37.184.72/2910.37.184.73 – 10.37.184.7810.37.184.79
1110.37.184.80/2910.37.184.81 – 10.37.184.8610.37.184.87
1210.37.184.88/2910.37.184.89 – 10.37.184.9410.37.184.95
1310.37.184.96/2910.37.184.97 – 10.37.184.10210.37.184.103
1410.37.184.104/2910.37.184.105 – 10.37.184.11010.37.184.111
1510.37.184.112/2910.37.184.113 – 10.37.184.11810.37.184.119
1610.37.184.120/2910.37.184.121 – 10.37.184.12610.37.184.127
1710.37.184.128/2910.37.184.129 – 10.37.184.13410.37.184.135
1810.37.184.136/2910.37.184.137 – 10.37.184.14210.37.184.143
1910.37.184.144/2910.37.184.145 – 10.37.184.15010.37.184.151
2010.37.184.152/2910.37.184.153 – 10.37.184.15810.37.184.159
2110.37.184.160/2910.37.184.161 – 10.37.184.16610.37.184.167
2210.37.184.168/2910.37.184.169 – 10.37.184.17410.37.184.175
2310.37.184.176/2910.37.184.177 – 10.37.184.18210.37.184.183
2410.37.184.184/2910.37.184.185 – 10.37.184.19010.37.184.191
2510.37.184.192/2910.37.184.193 – 10.37.184.19810.37.184.199
2610.37.184.200/2910.37.184.201 – 10.37.184.20610.37.184.207
2710.37.184.208/2910.37.184.209 – 10.37.184.21410.37.184.215
2810.37.184.216/2910.37.184.217 – 10.37.184.22210.37.184.223
2910.37.184.224/2910.37.184.225 – 10.37.184.23010.37.184.231
3010.37.184.232/2910.37.184.233 – 10.37.184.23810.37.184.239
3110.37.184.240/2910.37.184.241 – 10.37.184.24610.37.184.247
3210.37.184.248/2910.37.184.249 – 10.37.184.25410.37.184.255
3310.37.185.0/2910.37.185.1 – 10.37.185.610.37.185.7
3410.37.185.8/2910.37.185.9 – 10.37.185.1410.37.185.15
3510.37.185.16/2910.37.185.17 – 10.37.185.2210.37.185.23
3610.37.185.24/2910.37.185.25 – 10.37.185.3010.37.185.31
3710.37.185.32/2910.37.185.33 – 10.37.185.3810.37.185.39
3810.37.185.40/2910.37.185.41 – 10.37.185.4610.37.185.47
3910.37.185.48/2910.37.185.49 – 10.37.185.5410.37.185.55
4010.37.185.56/2910.37.185.57 – 10.37.185.6210.37.185.63
4110.37.185.64/2910.37.185.65 – 10.37.185.7010.37.185.71
4210.37.185.72/2910.37.185.73 – 10.37.185.7810.37.185.79
4310.37.185.80/2910.37.185.81 – 10.37.185.8610.37.185.87
4410.37.185.88/2910.37.185.89 – 10.37.185.9410.37.185.95
4510.37.185.96/2910.37.185.97 – 10.37.185.10210.37.185.103
4610.37.185.104/2910.37.185.105 – 10.37.185.11010.37.185.111
4710.37.185.112/2910.37.185.113 – 10.37.185.11810.37.185.119
4810.37.185.120/2910.37.185.121 – 10.37.185.12610.37.185.127
4910.37.185.128/2910.37.185.129 – 10.37.185.13410.37.185.135
5010.37.185.136/2910.37.185.137 – 10.37.185.14210.37.185.143
5110.37.185.144/2910.37.185.145 – 10.37.185.15010.37.185.151
5210.37.185.152/2910.37.185.153 – 10.37.185.15810.37.185.159
5310.37.185.160/2910.37.185.161 – 10.37.185.16610.37.185.167
5410.37.185.168/2910.37.185.169 – 10.37.185.17410.37.185.175
5510.37.185.176/2910.37.185.177 – 10.37.185.18210.37.185.183
5610.37.185.184/2910.37.185.185 – 10.37.185.19010.37.185.191
5710.37.185.192/2910.37.185.193 – 10.37.185.19810.37.185.199
5810.37.185.200/2910.37.185.201 – 10.37.185.20610.37.185.207
5910.37.185.208/2910.37.185.209 – 10.37.185.21410.37.185.215
6010.37.185.216/2910.37.185.217 – 10.37.185.22210.37.185.223
6110.37.185.224/2910.37.185.225 – 10.37.185.23010.37.185.231
6210.37.185.232/2910.37.185.233 – 10.37.185.23810.37.185.239
6310.37.185.240/2910.37.185.241 – 10.37.185.24610.37.185.247
6410.37.185.248/2910.37.185.249 – 10.37.185.25410.37.185.255
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 →