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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)10.78.20.0/23
network10.78.20.0/23
broadcast10.78.21.255
first host10.78.20.1
last host10.78.21.254
subnet mask255.255.254.0
wildcard0.0.1.255
addresses512
usable hosts510
classA
ipcalc 10.78.20.0/23
address00001010.01001110.00010100.00000000
subnet mask11111111.11111111.11111110.00000000
network00001010.01001110.00010100.00000000
broadcast00001010.01001110.00010101.11111111
green = network part, grey = host part
hex0x0a4e1400
decimal172889088
reverse dns0.20.78.10.in-addr.arpa
ipv4-mapped::ffff:a4e:1400

/23 split into /29 · 64 subnets

close ×
#networkhost rangebroadcast
110.78.20.0/2910.78.20.1 – 10.78.20.610.78.20.7
210.78.20.8/2910.78.20.9 – 10.78.20.1410.78.20.15
310.78.20.16/2910.78.20.17 – 10.78.20.2210.78.20.23
410.78.20.24/2910.78.20.25 – 10.78.20.3010.78.20.31
510.78.20.32/2910.78.20.33 – 10.78.20.3810.78.20.39
610.78.20.40/2910.78.20.41 – 10.78.20.4610.78.20.47
710.78.20.48/2910.78.20.49 – 10.78.20.5410.78.20.55
810.78.20.56/2910.78.20.57 – 10.78.20.6210.78.20.63
910.78.20.64/2910.78.20.65 – 10.78.20.7010.78.20.71
1010.78.20.72/2910.78.20.73 – 10.78.20.7810.78.20.79
1110.78.20.80/2910.78.20.81 – 10.78.20.8610.78.20.87
1210.78.20.88/2910.78.20.89 – 10.78.20.9410.78.20.95
1310.78.20.96/2910.78.20.97 – 10.78.20.10210.78.20.103
1410.78.20.104/2910.78.20.105 – 10.78.20.11010.78.20.111
1510.78.20.112/2910.78.20.113 – 10.78.20.11810.78.20.119
1610.78.20.120/2910.78.20.121 – 10.78.20.12610.78.20.127
1710.78.20.128/2910.78.20.129 – 10.78.20.13410.78.20.135
1810.78.20.136/2910.78.20.137 – 10.78.20.14210.78.20.143
1910.78.20.144/2910.78.20.145 – 10.78.20.15010.78.20.151
2010.78.20.152/2910.78.20.153 – 10.78.20.15810.78.20.159
2110.78.20.160/2910.78.20.161 – 10.78.20.16610.78.20.167
2210.78.20.168/2910.78.20.169 – 10.78.20.17410.78.20.175
2310.78.20.176/2910.78.20.177 – 10.78.20.18210.78.20.183
2410.78.20.184/2910.78.20.185 – 10.78.20.19010.78.20.191
2510.78.20.192/2910.78.20.193 – 10.78.20.19810.78.20.199
2610.78.20.200/2910.78.20.201 – 10.78.20.20610.78.20.207
2710.78.20.208/2910.78.20.209 – 10.78.20.21410.78.20.215
2810.78.20.216/2910.78.20.217 – 10.78.20.22210.78.20.223
2910.78.20.224/2910.78.20.225 – 10.78.20.23010.78.20.231
3010.78.20.232/2910.78.20.233 – 10.78.20.23810.78.20.239
3110.78.20.240/2910.78.20.241 – 10.78.20.24610.78.20.247
3210.78.20.248/2910.78.20.249 – 10.78.20.25410.78.20.255
3310.78.21.0/2910.78.21.1 – 10.78.21.610.78.21.7
3410.78.21.8/2910.78.21.9 – 10.78.21.1410.78.21.15
3510.78.21.16/2910.78.21.17 – 10.78.21.2210.78.21.23
3610.78.21.24/2910.78.21.25 – 10.78.21.3010.78.21.31
3710.78.21.32/2910.78.21.33 – 10.78.21.3810.78.21.39
3810.78.21.40/2910.78.21.41 – 10.78.21.4610.78.21.47
3910.78.21.48/2910.78.21.49 – 10.78.21.5410.78.21.55
4010.78.21.56/2910.78.21.57 – 10.78.21.6210.78.21.63
4110.78.21.64/2910.78.21.65 – 10.78.21.7010.78.21.71
4210.78.21.72/2910.78.21.73 – 10.78.21.7810.78.21.79
4310.78.21.80/2910.78.21.81 – 10.78.21.8610.78.21.87
4410.78.21.88/2910.78.21.89 – 10.78.21.9410.78.21.95
4510.78.21.96/2910.78.21.97 – 10.78.21.10210.78.21.103
4610.78.21.104/2910.78.21.105 – 10.78.21.11010.78.21.111
4710.78.21.112/2910.78.21.113 – 10.78.21.11810.78.21.119
4810.78.21.120/2910.78.21.121 – 10.78.21.12610.78.21.127
4910.78.21.128/2910.78.21.129 – 10.78.21.13410.78.21.135
5010.78.21.136/2910.78.21.137 – 10.78.21.14210.78.21.143
5110.78.21.144/2910.78.21.145 – 10.78.21.15010.78.21.151
5210.78.21.152/2910.78.21.153 – 10.78.21.15810.78.21.159
5310.78.21.160/2910.78.21.161 – 10.78.21.16610.78.21.167
5410.78.21.168/2910.78.21.169 – 10.78.21.17410.78.21.175
5510.78.21.176/2910.78.21.177 – 10.78.21.18210.78.21.183
5610.78.21.184/2910.78.21.185 – 10.78.21.19010.78.21.191
5710.78.21.192/2910.78.21.193 – 10.78.21.19810.78.21.199
5810.78.21.200/2910.78.21.201 – 10.78.21.20610.78.21.207
5910.78.21.208/2910.78.21.209 – 10.78.21.21410.78.21.215
6010.78.21.216/2910.78.21.217 – 10.78.21.22210.78.21.223
6110.78.21.224/2910.78.21.225 – 10.78.21.23010.78.21.231
6210.78.21.232/2910.78.21.233 – 10.78.21.23810.78.21.239
6310.78.21.240/2910.78.21.241 – 10.78.21.24610.78.21.247
6410.78.21.248/2910.78.21.249 – 10.78.21.25410.78.21.255
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 →