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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)10.78.124.0/23
network10.78.124.0/23
broadcast10.78.125.255
first host10.78.124.1
last host10.78.125.254
subnet mask255.255.254.0
wildcard0.0.1.255
addresses512
usable hosts510
classA
ipcalc 10.78.124.0/23
address00001010.01001110.01111100.00000000
subnet mask11111111.11111111.11111110.00000000
network00001010.01001110.01111100.00000000
broadcast00001010.01001110.01111101.11111111
green = network part, grey = host part
hex0x0a4e7c00
decimal172915712
reverse dns0.124.78.10.in-addr.arpa
ipv4-mapped::ffff:a4e:7c00

/23 split into /29 · 64 subnets

close ×
#networkhost rangebroadcast
110.78.124.0/2910.78.124.1 – 10.78.124.610.78.124.7
210.78.124.8/2910.78.124.9 – 10.78.124.1410.78.124.15
310.78.124.16/2910.78.124.17 – 10.78.124.2210.78.124.23
410.78.124.24/2910.78.124.25 – 10.78.124.3010.78.124.31
510.78.124.32/2910.78.124.33 – 10.78.124.3810.78.124.39
610.78.124.40/2910.78.124.41 – 10.78.124.4610.78.124.47
710.78.124.48/2910.78.124.49 – 10.78.124.5410.78.124.55
810.78.124.56/2910.78.124.57 – 10.78.124.6210.78.124.63
910.78.124.64/2910.78.124.65 – 10.78.124.7010.78.124.71
1010.78.124.72/2910.78.124.73 – 10.78.124.7810.78.124.79
1110.78.124.80/2910.78.124.81 – 10.78.124.8610.78.124.87
1210.78.124.88/2910.78.124.89 – 10.78.124.9410.78.124.95
1310.78.124.96/2910.78.124.97 – 10.78.124.10210.78.124.103
1410.78.124.104/2910.78.124.105 – 10.78.124.11010.78.124.111
1510.78.124.112/2910.78.124.113 – 10.78.124.11810.78.124.119
1610.78.124.120/2910.78.124.121 – 10.78.124.12610.78.124.127
1710.78.124.128/2910.78.124.129 – 10.78.124.13410.78.124.135
1810.78.124.136/2910.78.124.137 – 10.78.124.14210.78.124.143
1910.78.124.144/2910.78.124.145 – 10.78.124.15010.78.124.151
2010.78.124.152/2910.78.124.153 – 10.78.124.15810.78.124.159
2110.78.124.160/2910.78.124.161 – 10.78.124.16610.78.124.167
2210.78.124.168/2910.78.124.169 – 10.78.124.17410.78.124.175
2310.78.124.176/2910.78.124.177 – 10.78.124.18210.78.124.183
2410.78.124.184/2910.78.124.185 – 10.78.124.19010.78.124.191
2510.78.124.192/2910.78.124.193 – 10.78.124.19810.78.124.199
2610.78.124.200/2910.78.124.201 – 10.78.124.20610.78.124.207
2710.78.124.208/2910.78.124.209 – 10.78.124.21410.78.124.215
2810.78.124.216/2910.78.124.217 – 10.78.124.22210.78.124.223
2910.78.124.224/2910.78.124.225 – 10.78.124.23010.78.124.231
3010.78.124.232/2910.78.124.233 – 10.78.124.23810.78.124.239
3110.78.124.240/2910.78.124.241 – 10.78.124.24610.78.124.247
3210.78.124.248/2910.78.124.249 – 10.78.124.25410.78.124.255
3310.78.125.0/2910.78.125.1 – 10.78.125.610.78.125.7
3410.78.125.8/2910.78.125.9 – 10.78.125.1410.78.125.15
3510.78.125.16/2910.78.125.17 – 10.78.125.2210.78.125.23
3610.78.125.24/2910.78.125.25 – 10.78.125.3010.78.125.31
3710.78.125.32/2910.78.125.33 – 10.78.125.3810.78.125.39
3810.78.125.40/2910.78.125.41 – 10.78.125.4610.78.125.47
3910.78.125.48/2910.78.125.49 – 10.78.125.5410.78.125.55
4010.78.125.56/2910.78.125.57 – 10.78.125.6210.78.125.63
4110.78.125.64/2910.78.125.65 – 10.78.125.7010.78.125.71
4210.78.125.72/2910.78.125.73 – 10.78.125.7810.78.125.79
4310.78.125.80/2910.78.125.81 – 10.78.125.8610.78.125.87
4410.78.125.88/2910.78.125.89 – 10.78.125.9410.78.125.95
4510.78.125.96/2910.78.125.97 – 10.78.125.10210.78.125.103
4610.78.125.104/2910.78.125.105 – 10.78.125.11010.78.125.111
4710.78.125.112/2910.78.125.113 – 10.78.125.11810.78.125.119
4810.78.125.120/2910.78.125.121 – 10.78.125.12610.78.125.127
4910.78.125.128/2910.78.125.129 – 10.78.125.13410.78.125.135
5010.78.125.136/2910.78.125.137 – 10.78.125.14210.78.125.143
5110.78.125.144/2910.78.125.145 – 10.78.125.15010.78.125.151
5210.78.125.152/2910.78.125.153 – 10.78.125.15810.78.125.159
5310.78.125.160/2910.78.125.161 – 10.78.125.16610.78.125.167
5410.78.125.168/2910.78.125.169 – 10.78.125.17410.78.125.175
5510.78.125.176/2910.78.125.177 – 10.78.125.18210.78.125.183
5610.78.125.184/2910.78.125.185 – 10.78.125.19010.78.125.191
5710.78.125.192/2910.78.125.193 – 10.78.125.19810.78.125.199
5810.78.125.200/2910.78.125.201 – 10.78.125.20610.78.125.207
5910.78.125.208/2910.78.125.209 – 10.78.125.21410.78.125.215
6010.78.125.216/2910.78.125.217 – 10.78.125.22210.78.125.223
6110.78.125.224/2910.78.125.225 – 10.78.125.23010.78.125.231
6210.78.125.232/2910.78.125.233 – 10.78.125.23810.78.125.239
6310.78.125.240/2910.78.125.241 – 10.78.125.24610.78.125.247
6410.78.125.248/2910.78.125.249 – 10.78.125.25410.78.125.255
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 →