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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)10.167.186.0/23
network10.167.186.0/23
broadcast10.167.187.255
first host10.167.186.1
last host10.167.187.254
subnet mask255.255.254.0
wildcard0.0.1.255
addresses512
usable hosts510
classA
ipcalc 10.167.186.0/23
address00001010.10100111.10111010.00000000
subnet mask11111111.11111111.11111110.00000000
network00001010.10100111.10111010.00000000
broadcast00001010.10100111.10111011.11111111
green = network part, grey = host part
hex0x0aa7ba00
decimal178764288
reverse dns0.186.167.10.in-addr.arpa
ipv4-mapped::ffff:aa7:ba00

/23 split into /29 · 64 subnets

close ×
#networkhost rangebroadcast
110.167.186.0/2910.167.186.1 – 10.167.186.610.167.186.7
210.167.186.8/2910.167.186.9 – 10.167.186.1410.167.186.15
310.167.186.16/2910.167.186.17 – 10.167.186.2210.167.186.23
410.167.186.24/2910.167.186.25 – 10.167.186.3010.167.186.31
510.167.186.32/2910.167.186.33 – 10.167.186.3810.167.186.39
610.167.186.40/2910.167.186.41 – 10.167.186.4610.167.186.47
710.167.186.48/2910.167.186.49 – 10.167.186.5410.167.186.55
810.167.186.56/2910.167.186.57 – 10.167.186.6210.167.186.63
910.167.186.64/2910.167.186.65 – 10.167.186.7010.167.186.71
1010.167.186.72/2910.167.186.73 – 10.167.186.7810.167.186.79
1110.167.186.80/2910.167.186.81 – 10.167.186.8610.167.186.87
1210.167.186.88/2910.167.186.89 – 10.167.186.9410.167.186.95
1310.167.186.96/2910.167.186.97 – 10.167.186.10210.167.186.103
1410.167.186.104/2910.167.186.105 – 10.167.186.11010.167.186.111
1510.167.186.112/2910.167.186.113 – 10.167.186.11810.167.186.119
1610.167.186.120/2910.167.186.121 – 10.167.186.12610.167.186.127
1710.167.186.128/2910.167.186.129 – 10.167.186.13410.167.186.135
1810.167.186.136/2910.167.186.137 – 10.167.186.14210.167.186.143
1910.167.186.144/2910.167.186.145 – 10.167.186.15010.167.186.151
2010.167.186.152/2910.167.186.153 – 10.167.186.15810.167.186.159
2110.167.186.160/2910.167.186.161 – 10.167.186.16610.167.186.167
2210.167.186.168/2910.167.186.169 – 10.167.186.17410.167.186.175
2310.167.186.176/2910.167.186.177 – 10.167.186.18210.167.186.183
2410.167.186.184/2910.167.186.185 – 10.167.186.19010.167.186.191
2510.167.186.192/2910.167.186.193 – 10.167.186.19810.167.186.199
2610.167.186.200/2910.167.186.201 – 10.167.186.20610.167.186.207
2710.167.186.208/2910.167.186.209 – 10.167.186.21410.167.186.215
2810.167.186.216/2910.167.186.217 – 10.167.186.22210.167.186.223
2910.167.186.224/2910.167.186.225 – 10.167.186.23010.167.186.231
3010.167.186.232/2910.167.186.233 – 10.167.186.23810.167.186.239
3110.167.186.240/2910.167.186.241 – 10.167.186.24610.167.186.247
3210.167.186.248/2910.167.186.249 – 10.167.186.25410.167.186.255
3310.167.187.0/2910.167.187.1 – 10.167.187.610.167.187.7
3410.167.187.8/2910.167.187.9 – 10.167.187.1410.167.187.15
3510.167.187.16/2910.167.187.17 – 10.167.187.2210.167.187.23
3610.167.187.24/2910.167.187.25 – 10.167.187.3010.167.187.31
3710.167.187.32/2910.167.187.33 – 10.167.187.3810.167.187.39
3810.167.187.40/2910.167.187.41 – 10.167.187.4610.167.187.47
3910.167.187.48/2910.167.187.49 – 10.167.187.5410.167.187.55
4010.167.187.56/2910.167.187.57 – 10.167.187.6210.167.187.63
4110.167.187.64/2910.167.187.65 – 10.167.187.7010.167.187.71
4210.167.187.72/2910.167.187.73 – 10.167.187.7810.167.187.79
4310.167.187.80/2910.167.187.81 – 10.167.187.8610.167.187.87
4410.167.187.88/2910.167.187.89 – 10.167.187.9410.167.187.95
4510.167.187.96/2910.167.187.97 – 10.167.187.10210.167.187.103
4610.167.187.104/2910.167.187.105 – 10.167.187.11010.167.187.111
4710.167.187.112/2910.167.187.113 – 10.167.187.11810.167.187.119
4810.167.187.120/2910.167.187.121 – 10.167.187.12610.167.187.127
4910.167.187.128/2910.167.187.129 – 10.167.187.13410.167.187.135
5010.167.187.136/2910.167.187.137 – 10.167.187.14210.167.187.143
5110.167.187.144/2910.167.187.145 – 10.167.187.15010.167.187.151
5210.167.187.152/2910.167.187.153 – 10.167.187.15810.167.187.159
5310.167.187.160/2910.167.187.161 – 10.167.187.16610.167.187.167
5410.167.187.168/2910.167.187.169 – 10.167.187.17410.167.187.175
5510.167.187.176/2910.167.187.177 – 10.167.187.18210.167.187.183
5610.167.187.184/2910.167.187.185 – 10.167.187.19010.167.187.191
5710.167.187.192/2910.167.187.193 – 10.167.187.19810.167.187.199
5810.167.187.200/2910.167.187.201 – 10.167.187.20610.167.187.207
5910.167.187.208/2910.167.187.209 – 10.167.187.21410.167.187.215
6010.167.187.216/2910.167.187.217 – 10.167.187.22210.167.187.223
6110.167.187.224/2910.167.187.225 – 10.167.187.23010.167.187.231
6210.167.187.232/2910.167.187.233 – 10.167.187.23810.167.187.239
6310.167.187.240/2910.167.187.241 – 10.167.187.24610.167.187.247
6410.167.187.248/2910.167.187.249 – 10.167.187.25410.167.187.255
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 →