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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)10.2.78.0/23
network10.2.78.0/23
broadcast10.2.79.255
first host10.2.78.1
last host10.2.79.254
subnet mask255.255.254.0
wildcard0.0.1.255
addresses512
usable hosts510
classA
ipcalc 10.2.78.0/23
address00001010.00000010.01001110.00000000
subnet mask11111111.11111111.11111110.00000000
network00001010.00000010.01001110.00000000
broadcast00001010.00000010.01001111.11111111
green = network part, grey = host part
hex0x0a024e00
decimal167923200
reverse dns0.78.2.10.in-addr.arpa
ipv4-mapped::ffff:a02:4e00

/23 split into /29 · 64 subnets

close ×
#networkhost rangebroadcast
110.2.78.0/2910.2.78.1 – 10.2.78.610.2.78.7
210.2.78.8/2910.2.78.9 – 10.2.78.1410.2.78.15
310.2.78.16/2910.2.78.17 – 10.2.78.2210.2.78.23
410.2.78.24/2910.2.78.25 – 10.2.78.3010.2.78.31
510.2.78.32/2910.2.78.33 – 10.2.78.3810.2.78.39
610.2.78.40/2910.2.78.41 – 10.2.78.4610.2.78.47
710.2.78.48/2910.2.78.49 – 10.2.78.5410.2.78.55
810.2.78.56/2910.2.78.57 – 10.2.78.6210.2.78.63
910.2.78.64/2910.2.78.65 – 10.2.78.7010.2.78.71
1010.2.78.72/2910.2.78.73 – 10.2.78.7810.2.78.79
1110.2.78.80/2910.2.78.81 – 10.2.78.8610.2.78.87
1210.2.78.88/2910.2.78.89 – 10.2.78.9410.2.78.95
1310.2.78.96/2910.2.78.97 – 10.2.78.10210.2.78.103
1410.2.78.104/2910.2.78.105 – 10.2.78.11010.2.78.111
1510.2.78.112/2910.2.78.113 – 10.2.78.11810.2.78.119
1610.2.78.120/2910.2.78.121 – 10.2.78.12610.2.78.127
1710.2.78.128/2910.2.78.129 – 10.2.78.13410.2.78.135
1810.2.78.136/2910.2.78.137 – 10.2.78.14210.2.78.143
1910.2.78.144/2910.2.78.145 – 10.2.78.15010.2.78.151
2010.2.78.152/2910.2.78.153 – 10.2.78.15810.2.78.159
2110.2.78.160/2910.2.78.161 – 10.2.78.16610.2.78.167
2210.2.78.168/2910.2.78.169 – 10.2.78.17410.2.78.175
2310.2.78.176/2910.2.78.177 – 10.2.78.18210.2.78.183
2410.2.78.184/2910.2.78.185 – 10.2.78.19010.2.78.191
2510.2.78.192/2910.2.78.193 – 10.2.78.19810.2.78.199
2610.2.78.200/2910.2.78.201 – 10.2.78.20610.2.78.207
2710.2.78.208/2910.2.78.209 – 10.2.78.21410.2.78.215
2810.2.78.216/2910.2.78.217 – 10.2.78.22210.2.78.223
2910.2.78.224/2910.2.78.225 – 10.2.78.23010.2.78.231
3010.2.78.232/2910.2.78.233 – 10.2.78.23810.2.78.239
3110.2.78.240/2910.2.78.241 – 10.2.78.24610.2.78.247
3210.2.78.248/2910.2.78.249 – 10.2.78.25410.2.78.255
3310.2.79.0/2910.2.79.1 – 10.2.79.610.2.79.7
3410.2.79.8/2910.2.79.9 – 10.2.79.1410.2.79.15
3510.2.79.16/2910.2.79.17 – 10.2.79.2210.2.79.23
3610.2.79.24/2910.2.79.25 – 10.2.79.3010.2.79.31
3710.2.79.32/2910.2.79.33 – 10.2.79.3810.2.79.39
3810.2.79.40/2910.2.79.41 – 10.2.79.4610.2.79.47
3910.2.79.48/2910.2.79.49 – 10.2.79.5410.2.79.55
4010.2.79.56/2910.2.79.57 – 10.2.79.6210.2.79.63
4110.2.79.64/2910.2.79.65 – 10.2.79.7010.2.79.71
4210.2.79.72/2910.2.79.73 – 10.2.79.7810.2.79.79
4310.2.79.80/2910.2.79.81 – 10.2.79.8610.2.79.87
4410.2.79.88/2910.2.79.89 – 10.2.79.9410.2.79.95
4510.2.79.96/2910.2.79.97 – 10.2.79.10210.2.79.103
4610.2.79.104/2910.2.79.105 – 10.2.79.11010.2.79.111
4710.2.79.112/2910.2.79.113 – 10.2.79.11810.2.79.119
4810.2.79.120/2910.2.79.121 – 10.2.79.12610.2.79.127
4910.2.79.128/2910.2.79.129 – 10.2.79.13410.2.79.135
5010.2.79.136/2910.2.79.137 – 10.2.79.14210.2.79.143
5110.2.79.144/2910.2.79.145 – 10.2.79.15010.2.79.151
5210.2.79.152/2910.2.79.153 – 10.2.79.15810.2.79.159
5310.2.79.160/2910.2.79.161 – 10.2.79.16610.2.79.167
5410.2.79.168/2910.2.79.169 – 10.2.79.17410.2.79.175
5510.2.79.176/2910.2.79.177 – 10.2.79.18210.2.79.183
5610.2.79.184/2910.2.79.185 – 10.2.79.19010.2.79.191
5710.2.79.192/2910.2.79.193 – 10.2.79.19810.2.79.199
5810.2.79.200/2910.2.79.201 – 10.2.79.20610.2.79.207
5910.2.79.208/2910.2.79.209 – 10.2.79.21410.2.79.215
6010.2.79.216/2910.2.79.217 – 10.2.79.22210.2.79.223
6110.2.79.224/2910.2.79.225 – 10.2.79.23010.2.79.231
6210.2.79.232/2910.2.79.233 – 10.2.79.23810.2.79.239
6310.2.79.240/2910.2.79.241 – 10.2.79.24610.2.79.247
6410.2.79.248/2910.2.79.249 – 10.2.79.25410.2.79.255
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 →