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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)10.167.40.0/23
network10.167.40.0/23
broadcast10.167.41.255
first host10.167.40.1
last host10.167.41.254
subnet mask255.255.254.0
wildcard0.0.1.255
addresses512
usable hosts510
classA
ipcalc 10.167.40.0/23
address00001010.10100111.00101000.00000000
subnet mask11111111.11111111.11111110.00000000
network00001010.10100111.00101000.00000000
broadcast00001010.10100111.00101001.11111111
green = network part, grey = host part
hex0x0aa72800
decimal178726912
reverse dns0.40.167.10.in-addr.arpa
ipv4-mapped::ffff:aa7:2800

/23 split into /29 · 64 subnets

close ×
#networkhost rangebroadcast
110.167.40.0/2910.167.40.1 – 10.167.40.610.167.40.7
210.167.40.8/2910.167.40.9 – 10.167.40.1410.167.40.15
310.167.40.16/2910.167.40.17 – 10.167.40.2210.167.40.23
410.167.40.24/2910.167.40.25 – 10.167.40.3010.167.40.31
510.167.40.32/2910.167.40.33 – 10.167.40.3810.167.40.39
610.167.40.40/2910.167.40.41 – 10.167.40.4610.167.40.47
710.167.40.48/2910.167.40.49 – 10.167.40.5410.167.40.55
810.167.40.56/2910.167.40.57 – 10.167.40.6210.167.40.63
910.167.40.64/2910.167.40.65 – 10.167.40.7010.167.40.71
1010.167.40.72/2910.167.40.73 – 10.167.40.7810.167.40.79
1110.167.40.80/2910.167.40.81 – 10.167.40.8610.167.40.87
1210.167.40.88/2910.167.40.89 – 10.167.40.9410.167.40.95
1310.167.40.96/2910.167.40.97 – 10.167.40.10210.167.40.103
1410.167.40.104/2910.167.40.105 – 10.167.40.11010.167.40.111
1510.167.40.112/2910.167.40.113 – 10.167.40.11810.167.40.119
1610.167.40.120/2910.167.40.121 – 10.167.40.12610.167.40.127
1710.167.40.128/2910.167.40.129 – 10.167.40.13410.167.40.135
1810.167.40.136/2910.167.40.137 – 10.167.40.14210.167.40.143
1910.167.40.144/2910.167.40.145 – 10.167.40.15010.167.40.151
2010.167.40.152/2910.167.40.153 – 10.167.40.15810.167.40.159
2110.167.40.160/2910.167.40.161 – 10.167.40.16610.167.40.167
2210.167.40.168/2910.167.40.169 – 10.167.40.17410.167.40.175
2310.167.40.176/2910.167.40.177 – 10.167.40.18210.167.40.183
2410.167.40.184/2910.167.40.185 – 10.167.40.19010.167.40.191
2510.167.40.192/2910.167.40.193 – 10.167.40.19810.167.40.199
2610.167.40.200/2910.167.40.201 – 10.167.40.20610.167.40.207
2710.167.40.208/2910.167.40.209 – 10.167.40.21410.167.40.215
2810.167.40.216/2910.167.40.217 – 10.167.40.22210.167.40.223
2910.167.40.224/2910.167.40.225 – 10.167.40.23010.167.40.231
3010.167.40.232/2910.167.40.233 – 10.167.40.23810.167.40.239
3110.167.40.240/2910.167.40.241 – 10.167.40.24610.167.40.247
3210.167.40.248/2910.167.40.249 – 10.167.40.25410.167.40.255
3310.167.41.0/2910.167.41.1 – 10.167.41.610.167.41.7
3410.167.41.8/2910.167.41.9 – 10.167.41.1410.167.41.15
3510.167.41.16/2910.167.41.17 – 10.167.41.2210.167.41.23
3610.167.41.24/2910.167.41.25 – 10.167.41.3010.167.41.31
3710.167.41.32/2910.167.41.33 – 10.167.41.3810.167.41.39
3810.167.41.40/2910.167.41.41 – 10.167.41.4610.167.41.47
3910.167.41.48/2910.167.41.49 – 10.167.41.5410.167.41.55
4010.167.41.56/2910.167.41.57 – 10.167.41.6210.167.41.63
4110.167.41.64/2910.167.41.65 – 10.167.41.7010.167.41.71
4210.167.41.72/2910.167.41.73 – 10.167.41.7810.167.41.79
4310.167.41.80/2910.167.41.81 – 10.167.41.8610.167.41.87
4410.167.41.88/2910.167.41.89 – 10.167.41.9410.167.41.95
4510.167.41.96/2910.167.41.97 – 10.167.41.10210.167.41.103
4610.167.41.104/2910.167.41.105 – 10.167.41.11010.167.41.111
4710.167.41.112/2910.167.41.113 – 10.167.41.11810.167.41.119
4810.167.41.120/2910.167.41.121 – 10.167.41.12610.167.41.127
4910.167.41.128/2910.167.41.129 – 10.167.41.13410.167.41.135
5010.167.41.136/2910.167.41.137 – 10.167.41.14210.167.41.143
5110.167.41.144/2910.167.41.145 – 10.167.41.15010.167.41.151
5210.167.41.152/2910.167.41.153 – 10.167.41.15810.167.41.159
5310.167.41.160/2910.167.41.161 – 10.167.41.16610.167.41.167
5410.167.41.168/2910.167.41.169 – 10.167.41.17410.167.41.175
5510.167.41.176/2910.167.41.177 – 10.167.41.18210.167.41.183
5610.167.41.184/2910.167.41.185 – 10.167.41.19010.167.41.191
5710.167.41.192/2910.167.41.193 – 10.167.41.19810.167.41.199
5810.167.41.200/2910.167.41.201 – 10.167.41.20610.167.41.207
5910.167.41.208/2910.167.41.209 – 10.167.41.21410.167.41.215
6010.167.41.216/2910.167.41.217 – 10.167.41.22210.167.41.223
6110.167.41.224/2910.167.41.225 – 10.167.41.23010.167.41.231
6210.167.41.232/2910.167.41.233 – 10.167.41.23810.167.41.239
6310.167.41.240/2910.167.41.241 – 10.167.41.24610.167.41.247
6410.167.41.248/2910.167.41.249 – 10.167.41.25410.167.41.255
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 →