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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)10.187.136.0/23
network10.187.136.0/23
broadcast10.187.137.255
first host10.187.136.1
last host10.187.137.254
subnet mask255.255.254.0
wildcard0.0.1.255
addresses512
usable hosts510
classA
ipcalc 10.187.136.0/23
address00001010.10111011.10001000.00000000
subnet mask11111111.11111111.11111110.00000000
network00001010.10111011.10001000.00000000
broadcast00001010.10111011.10001001.11111111
green = network part, grey = host part
hex0x0abb8800
decimal180062208
reverse dns0.136.187.10.in-addr.arpa
ipv4-mapped::ffff:abb:8800

/23 split into /29 · 64 subnets

close ×
#networkhost rangebroadcast
110.187.136.0/2910.187.136.1 – 10.187.136.610.187.136.7
210.187.136.8/2910.187.136.9 – 10.187.136.1410.187.136.15
310.187.136.16/2910.187.136.17 – 10.187.136.2210.187.136.23
410.187.136.24/2910.187.136.25 – 10.187.136.3010.187.136.31
510.187.136.32/2910.187.136.33 – 10.187.136.3810.187.136.39
610.187.136.40/2910.187.136.41 – 10.187.136.4610.187.136.47
710.187.136.48/2910.187.136.49 – 10.187.136.5410.187.136.55
810.187.136.56/2910.187.136.57 – 10.187.136.6210.187.136.63
910.187.136.64/2910.187.136.65 – 10.187.136.7010.187.136.71
1010.187.136.72/2910.187.136.73 – 10.187.136.7810.187.136.79
1110.187.136.80/2910.187.136.81 – 10.187.136.8610.187.136.87
1210.187.136.88/2910.187.136.89 – 10.187.136.9410.187.136.95
1310.187.136.96/2910.187.136.97 – 10.187.136.10210.187.136.103
1410.187.136.104/2910.187.136.105 – 10.187.136.11010.187.136.111
1510.187.136.112/2910.187.136.113 – 10.187.136.11810.187.136.119
1610.187.136.120/2910.187.136.121 – 10.187.136.12610.187.136.127
1710.187.136.128/2910.187.136.129 – 10.187.136.13410.187.136.135
1810.187.136.136/2910.187.136.137 – 10.187.136.14210.187.136.143
1910.187.136.144/2910.187.136.145 – 10.187.136.15010.187.136.151
2010.187.136.152/2910.187.136.153 – 10.187.136.15810.187.136.159
2110.187.136.160/2910.187.136.161 – 10.187.136.16610.187.136.167
2210.187.136.168/2910.187.136.169 – 10.187.136.17410.187.136.175
2310.187.136.176/2910.187.136.177 – 10.187.136.18210.187.136.183
2410.187.136.184/2910.187.136.185 – 10.187.136.19010.187.136.191
2510.187.136.192/2910.187.136.193 – 10.187.136.19810.187.136.199
2610.187.136.200/2910.187.136.201 – 10.187.136.20610.187.136.207
2710.187.136.208/2910.187.136.209 – 10.187.136.21410.187.136.215
2810.187.136.216/2910.187.136.217 – 10.187.136.22210.187.136.223
2910.187.136.224/2910.187.136.225 – 10.187.136.23010.187.136.231
3010.187.136.232/2910.187.136.233 – 10.187.136.23810.187.136.239
3110.187.136.240/2910.187.136.241 – 10.187.136.24610.187.136.247
3210.187.136.248/2910.187.136.249 – 10.187.136.25410.187.136.255
3310.187.137.0/2910.187.137.1 – 10.187.137.610.187.137.7
3410.187.137.8/2910.187.137.9 – 10.187.137.1410.187.137.15
3510.187.137.16/2910.187.137.17 – 10.187.137.2210.187.137.23
3610.187.137.24/2910.187.137.25 – 10.187.137.3010.187.137.31
3710.187.137.32/2910.187.137.33 – 10.187.137.3810.187.137.39
3810.187.137.40/2910.187.137.41 – 10.187.137.4610.187.137.47
3910.187.137.48/2910.187.137.49 – 10.187.137.5410.187.137.55
4010.187.137.56/2910.187.137.57 – 10.187.137.6210.187.137.63
4110.187.137.64/2910.187.137.65 – 10.187.137.7010.187.137.71
4210.187.137.72/2910.187.137.73 – 10.187.137.7810.187.137.79
4310.187.137.80/2910.187.137.81 – 10.187.137.8610.187.137.87
4410.187.137.88/2910.187.137.89 – 10.187.137.9410.187.137.95
4510.187.137.96/2910.187.137.97 – 10.187.137.10210.187.137.103
4610.187.137.104/2910.187.137.105 – 10.187.137.11010.187.137.111
4710.187.137.112/2910.187.137.113 – 10.187.137.11810.187.137.119
4810.187.137.120/2910.187.137.121 – 10.187.137.12610.187.137.127
4910.187.137.128/2910.187.137.129 – 10.187.137.13410.187.137.135
5010.187.137.136/2910.187.137.137 – 10.187.137.14210.187.137.143
5110.187.137.144/2910.187.137.145 – 10.187.137.15010.187.137.151
5210.187.137.152/2910.187.137.153 – 10.187.137.15810.187.137.159
5310.187.137.160/2910.187.137.161 – 10.187.137.16610.187.137.167
5410.187.137.168/2910.187.137.169 – 10.187.137.17410.187.137.175
5510.187.137.176/2910.187.137.177 – 10.187.137.18210.187.137.183
5610.187.137.184/2910.187.137.185 – 10.187.137.19010.187.137.191
5710.187.137.192/2910.187.137.193 – 10.187.137.19810.187.137.199
5810.187.137.200/2910.187.137.201 – 10.187.137.20610.187.137.207
5910.187.137.208/2910.187.137.209 – 10.187.137.21410.187.137.215
6010.187.137.216/2910.187.137.217 – 10.187.137.22210.187.137.223
6110.187.137.224/2910.187.137.225 – 10.187.137.23010.187.137.231
6210.187.137.232/2910.187.137.233 – 10.187.137.23810.187.137.239
6310.187.137.240/2910.187.137.241 – 10.187.137.24610.187.137.247
6410.187.137.248/2910.187.137.249 – 10.187.137.25410.187.137.255
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 →