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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)10.70.78.0/23
network10.70.78.0/23
broadcast10.70.79.255
first host10.70.78.1
last host10.70.79.254
subnet mask255.255.254.0
wildcard0.0.1.255
addresses512
usable hosts510
classA
ipcalc 10.70.78.0/23
address00001010.01000110.01001110.00000000
subnet mask11111111.11111111.11111110.00000000
network00001010.01000110.01001110.00000000
broadcast00001010.01000110.01001111.11111111
green = network part, grey = host part
hex0x0a464e00
decimal172379648
reverse dns0.78.70.10.in-addr.arpa
ipv4-mapped::ffff:a46:4e00

/23 split into /29 · 64 subnets

close ×
#networkhost rangebroadcast
110.70.78.0/2910.70.78.1 – 10.70.78.610.70.78.7
210.70.78.8/2910.70.78.9 – 10.70.78.1410.70.78.15
310.70.78.16/2910.70.78.17 – 10.70.78.2210.70.78.23
410.70.78.24/2910.70.78.25 – 10.70.78.3010.70.78.31
510.70.78.32/2910.70.78.33 – 10.70.78.3810.70.78.39
610.70.78.40/2910.70.78.41 – 10.70.78.4610.70.78.47
710.70.78.48/2910.70.78.49 – 10.70.78.5410.70.78.55
810.70.78.56/2910.70.78.57 – 10.70.78.6210.70.78.63
910.70.78.64/2910.70.78.65 – 10.70.78.7010.70.78.71
1010.70.78.72/2910.70.78.73 – 10.70.78.7810.70.78.79
1110.70.78.80/2910.70.78.81 – 10.70.78.8610.70.78.87
1210.70.78.88/2910.70.78.89 – 10.70.78.9410.70.78.95
1310.70.78.96/2910.70.78.97 – 10.70.78.10210.70.78.103
1410.70.78.104/2910.70.78.105 – 10.70.78.11010.70.78.111
1510.70.78.112/2910.70.78.113 – 10.70.78.11810.70.78.119
1610.70.78.120/2910.70.78.121 – 10.70.78.12610.70.78.127
1710.70.78.128/2910.70.78.129 – 10.70.78.13410.70.78.135
1810.70.78.136/2910.70.78.137 – 10.70.78.14210.70.78.143
1910.70.78.144/2910.70.78.145 – 10.70.78.15010.70.78.151
2010.70.78.152/2910.70.78.153 – 10.70.78.15810.70.78.159
2110.70.78.160/2910.70.78.161 – 10.70.78.16610.70.78.167
2210.70.78.168/2910.70.78.169 – 10.70.78.17410.70.78.175
2310.70.78.176/2910.70.78.177 – 10.70.78.18210.70.78.183
2410.70.78.184/2910.70.78.185 – 10.70.78.19010.70.78.191
2510.70.78.192/2910.70.78.193 – 10.70.78.19810.70.78.199
2610.70.78.200/2910.70.78.201 – 10.70.78.20610.70.78.207
2710.70.78.208/2910.70.78.209 – 10.70.78.21410.70.78.215
2810.70.78.216/2910.70.78.217 – 10.70.78.22210.70.78.223
2910.70.78.224/2910.70.78.225 – 10.70.78.23010.70.78.231
3010.70.78.232/2910.70.78.233 – 10.70.78.23810.70.78.239
3110.70.78.240/2910.70.78.241 – 10.70.78.24610.70.78.247
3210.70.78.248/2910.70.78.249 – 10.70.78.25410.70.78.255
3310.70.79.0/2910.70.79.1 – 10.70.79.610.70.79.7
3410.70.79.8/2910.70.79.9 – 10.70.79.1410.70.79.15
3510.70.79.16/2910.70.79.17 – 10.70.79.2210.70.79.23
3610.70.79.24/2910.70.79.25 – 10.70.79.3010.70.79.31
3710.70.79.32/2910.70.79.33 – 10.70.79.3810.70.79.39
3810.70.79.40/2910.70.79.41 – 10.70.79.4610.70.79.47
3910.70.79.48/2910.70.79.49 – 10.70.79.5410.70.79.55
4010.70.79.56/2910.70.79.57 – 10.70.79.6210.70.79.63
4110.70.79.64/2910.70.79.65 – 10.70.79.7010.70.79.71
4210.70.79.72/2910.70.79.73 – 10.70.79.7810.70.79.79
4310.70.79.80/2910.70.79.81 – 10.70.79.8610.70.79.87
4410.70.79.88/2910.70.79.89 – 10.70.79.9410.70.79.95
4510.70.79.96/2910.70.79.97 – 10.70.79.10210.70.79.103
4610.70.79.104/2910.70.79.105 – 10.70.79.11010.70.79.111
4710.70.79.112/2910.70.79.113 – 10.70.79.11810.70.79.119
4810.70.79.120/2910.70.79.121 – 10.70.79.12610.70.79.127
4910.70.79.128/2910.70.79.129 – 10.70.79.13410.70.79.135
5010.70.79.136/2910.70.79.137 – 10.70.79.14210.70.79.143
5110.70.79.144/2910.70.79.145 – 10.70.79.15010.70.79.151
5210.70.79.152/2910.70.79.153 – 10.70.79.15810.70.79.159
5310.70.79.160/2910.70.79.161 – 10.70.79.16610.70.79.167
5410.70.79.168/2910.70.79.169 – 10.70.79.17410.70.79.175
5510.70.79.176/2910.70.79.177 – 10.70.79.18210.70.79.183
5610.70.79.184/2910.70.79.185 – 10.70.79.19010.70.79.191
5710.70.79.192/2910.70.79.193 – 10.70.79.19810.70.79.199
5810.70.79.200/2910.70.79.201 – 10.70.79.20610.70.79.207
5910.70.79.208/2910.70.79.209 – 10.70.79.21410.70.79.215
6010.70.79.216/2910.70.79.217 – 10.70.79.22210.70.79.223
6110.70.79.224/2910.70.79.225 – 10.70.79.23010.70.79.231
6210.70.79.232/2910.70.79.233 – 10.70.79.23810.70.79.239
6310.70.79.240/2910.70.79.241 – 10.70.79.24610.70.79.247
6410.70.79.248/2910.70.79.249 – 10.70.79.25410.70.79.255
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 →