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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)10.78.172.0/23
network10.78.172.0/23
broadcast10.78.173.255
first host10.78.172.1
last host10.78.173.254
subnet mask255.255.254.0
wildcard0.0.1.255
addresses512
usable hosts510
classA
ipcalc 10.78.172.0/23
address00001010.01001110.10101100.00000000
subnet mask11111111.11111111.11111110.00000000
network00001010.01001110.10101100.00000000
broadcast00001010.01001110.10101101.11111111
green = network part, grey = host part
hex0x0a4eac00
decimal172928000
reverse dns0.172.78.10.in-addr.arpa
ipv4-mapped::ffff:a4e:ac00

/23 split into /29 · 64 subnets

close ×
#networkhost rangebroadcast
110.78.172.0/2910.78.172.1 – 10.78.172.610.78.172.7
210.78.172.8/2910.78.172.9 – 10.78.172.1410.78.172.15
310.78.172.16/2910.78.172.17 – 10.78.172.2210.78.172.23
410.78.172.24/2910.78.172.25 – 10.78.172.3010.78.172.31
510.78.172.32/2910.78.172.33 – 10.78.172.3810.78.172.39
610.78.172.40/2910.78.172.41 – 10.78.172.4610.78.172.47
710.78.172.48/2910.78.172.49 – 10.78.172.5410.78.172.55
810.78.172.56/2910.78.172.57 – 10.78.172.6210.78.172.63
910.78.172.64/2910.78.172.65 – 10.78.172.7010.78.172.71
1010.78.172.72/2910.78.172.73 – 10.78.172.7810.78.172.79
1110.78.172.80/2910.78.172.81 – 10.78.172.8610.78.172.87
1210.78.172.88/2910.78.172.89 – 10.78.172.9410.78.172.95
1310.78.172.96/2910.78.172.97 – 10.78.172.10210.78.172.103
1410.78.172.104/2910.78.172.105 – 10.78.172.11010.78.172.111
1510.78.172.112/2910.78.172.113 – 10.78.172.11810.78.172.119
1610.78.172.120/2910.78.172.121 – 10.78.172.12610.78.172.127
1710.78.172.128/2910.78.172.129 – 10.78.172.13410.78.172.135
1810.78.172.136/2910.78.172.137 – 10.78.172.14210.78.172.143
1910.78.172.144/2910.78.172.145 – 10.78.172.15010.78.172.151
2010.78.172.152/2910.78.172.153 – 10.78.172.15810.78.172.159
2110.78.172.160/2910.78.172.161 – 10.78.172.16610.78.172.167
2210.78.172.168/2910.78.172.169 – 10.78.172.17410.78.172.175
2310.78.172.176/2910.78.172.177 – 10.78.172.18210.78.172.183
2410.78.172.184/2910.78.172.185 – 10.78.172.19010.78.172.191
2510.78.172.192/2910.78.172.193 – 10.78.172.19810.78.172.199
2610.78.172.200/2910.78.172.201 – 10.78.172.20610.78.172.207
2710.78.172.208/2910.78.172.209 – 10.78.172.21410.78.172.215
2810.78.172.216/2910.78.172.217 – 10.78.172.22210.78.172.223
2910.78.172.224/2910.78.172.225 – 10.78.172.23010.78.172.231
3010.78.172.232/2910.78.172.233 – 10.78.172.23810.78.172.239
3110.78.172.240/2910.78.172.241 – 10.78.172.24610.78.172.247
3210.78.172.248/2910.78.172.249 – 10.78.172.25410.78.172.255
3310.78.173.0/2910.78.173.1 – 10.78.173.610.78.173.7
3410.78.173.8/2910.78.173.9 – 10.78.173.1410.78.173.15
3510.78.173.16/2910.78.173.17 – 10.78.173.2210.78.173.23
3610.78.173.24/2910.78.173.25 – 10.78.173.3010.78.173.31
3710.78.173.32/2910.78.173.33 – 10.78.173.3810.78.173.39
3810.78.173.40/2910.78.173.41 – 10.78.173.4610.78.173.47
3910.78.173.48/2910.78.173.49 – 10.78.173.5410.78.173.55
4010.78.173.56/2910.78.173.57 – 10.78.173.6210.78.173.63
4110.78.173.64/2910.78.173.65 – 10.78.173.7010.78.173.71
4210.78.173.72/2910.78.173.73 – 10.78.173.7810.78.173.79
4310.78.173.80/2910.78.173.81 – 10.78.173.8610.78.173.87
4410.78.173.88/2910.78.173.89 – 10.78.173.9410.78.173.95
4510.78.173.96/2910.78.173.97 – 10.78.173.10210.78.173.103
4610.78.173.104/2910.78.173.105 – 10.78.173.11010.78.173.111
4710.78.173.112/2910.78.173.113 – 10.78.173.11810.78.173.119
4810.78.173.120/2910.78.173.121 – 10.78.173.12610.78.173.127
4910.78.173.128/2910.78.173.129 – 10.78.173.13410.78.173.135
5010.78.173.136/2910.78.173.137 – 10.78.173.14210.78.173.143
5110.78.173.144/2910.78.173.145 – 10.78.173.15010.78.173.151
5210.78.173.152/2910.78.173.153 – 10.78.173.15810.78.173.159
5310.78.173.160/2910.78.173.161 – 10.78.173.16610.78.173.167
5410.78.173.168/2910.78.173.169 – 10.78.173.17410.78.173.175
5510.78.173.176/2910.78.173.177 – 10.78.173.18210.78.173.183
5610.78.173.184/2910.78.173.185 – 10.78.173.19010.78.173.191
5710.78.173.192/2910.78.173.193 – 10.78.173.19810.78.173.199
5810.78.173.200/2910.78.173.201 – 10.78.173.20610.78.173.207
5910.78.173.208/2910.78.173.209 – 10.78.173.21410.78.173.215
6010.78.173.216/2910.78.173.217 – 10.78.173.22210.78.173.223
6110.78.173.224/2910.78.173.225 – 10.78.173.23010.78.173.231
6210.78.173.232/2910.78.173.233 – 10.78.173.23810.78.173.239
6310.78.173.240/2910.78.173.241 – 10.78.173.24610.78.173.247
6410.78.173.248/2910.78.173.249 – 10.78.173.25410.78.173.255
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 →