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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)10.78.202.0/23
network10.78.202.0/23
broadcast10.78.203.255
first host10.78.202.1
last host10.78.203.254
subnet mask255.255.254.0
wildcard0.0.1.255
addresses512
usable hosts510
classA
ipcalc 10.78.202.0/23
address00001010.01001110.11001010.00000000
subnet mask11111111.11111111.11111110.00000000
network00001010.01001110.11001010.00000000
broadcast00001010.01001110.11001011.11111111
green = network part, grey = host part
hex0x0a4eca00
decimal172935680
reverse dns0.202.78.10.in-addr.arpa
ipv4-mapped::ffff:a4e:ca00

/23 split into /29 · 64 subnets

close ×
#networkhost rangebroadcast
110.78.202.0/2910.78.202.1 – 10.78.202.610.78.202.7
210.78.202.8/2910.78.202.9 – 10.78.202.1410.78.202.15
310.78.202.16/2910.78.202.17 – 10.78.202.2210.78.202.23
410.78.202.24/2910.78.202.25 – 10.78.202.3010.78.202.31
510.78.202.32/2910.78.202.33 – 10.78.202.3810.78.202.39
610.78.202.40/2910.78.202.41 – 10.78.202.4610.78.202.47
710.78.202.48/2910.78.202.49 – 10.78.202.5410.78.202.55
810.78.202.56/2910.78.202.57 – 10.78.202.6210.78.202.63
910.78.202.64/2910.78.202.65 – 10.78.202.7010.78.202.71
1010.78.202.72/2910.78.202.73 – 10.78.202.7810.78.202.79
1110.78.202.80/2910.78.202.81 – 10.78.202.8610.78.202.87
1210.78.202.88/2910.78.202.89 – 10.78.202.9410.78.202.95
1310.78.202.96/2910.78.202.97 – 10.78.202.10210.78.202.103
1410.78.202.104/2910.78.202.105 – 10.78.202.11010.78.202.111
1510.78.202.112/2910.78.202.113 – 10.78.202.11810.78.202.119
1610.78.202.120/2910.78.202.121 – 10.78.202.12610.78.202.127
1710.78.202.128/2910.78.202.129 – 10.78.202.13410.78.202.135
1810.78.202.136/2910.78.202.137 – 10.78.202.14210.78.202.143
1910.78.202.144/2910.78.202.145 – 10.78.202.15010.78.202.151
2010.78.202.152/2910.78.202.153 – 10.78.202.15810.78.202.159
2110.78.202.160/2910.78.202.161 – 10.78.202.16610.78.202.167
2210.78.202.168/2910.78.202.169 – 10.78.202.17410.78.202.175
2310.78.202.176/2910.78.202.177 – 10.78.202.18210.78.202.183
2410.78.202.184/2910.78.202.185 – 10.78.202.19010.78.202.191
2510.78.202.192/2910.78.202.193 – 10.78.202.19810.78.202.199
2610.78.202.200/2910.78.202.201 – 10.78.202.20610.78.202.207
2710.78.202.208/2910.78.202.209 – 10.78.202.21410.78.202.215
2810.78.202.216/2910.78.202.217 – 10.78.202.22210.78.202.223
2910.78.202.224/2910.78.202.225 – 10.78.202.23010.78.202.231
3010.78.202.232/2910.78.202.233 – 10.78.202.23810.78.202.239
3110.78.202.240/2910.78.202.241 – 10.78.202.24610.78.202.247
3210.78.202.248/2910.78.202.249 – 10.78.202.25410.78.202.255
3310.78.203.0/2910.78.203.1 – 10.78.203.610.78.203.7
3410.78.203.8/2910.78.203.9 – 10.78.203.1410.78.203.15
3510.78.203.16/2910.78.203.17 – 10.78.203.2210.78.203.23
3610.78.203.24/2910.78.203.25 – 10.78.203.3010.78.203.31
3710.78.203.32/2910.78.203.33 – 10.78.203.3810.78.203.39
3810.78.203.40/2910.78.203.41 – 10.78.203.4610.78.203.47
3910.78.203.48/2910.78.203.49 – 10.78.203.5410.78.203.55
4010.78.203.56/2910.78.203.57 – 10.78.203.6210.78.203.63
4110.78.203.64/2910.78.203.65 – 10.78.203.7010.78.203.71
4210.78.203.72/2910.78.203.73 – 10.78.203.7810.78.203.79
4310.78.203.80/2910.78.203.81 – 10.78.203.8610.78.203.87
4410.78.203.88/2910.78.203.89 – 10.78.203.9410.78.203.95
4510.78.203.96/2910.78.203.97 – 10.78.203.10210.78.203.103
4610.78.203.104/2910.78.203.105 – 10.78.203.11010.78.203.111
4710.78.203.112/2910.78.203.113 – 10.78.203.11810.78.203.119
4810.78.203.120/2910.78.203.121 – 10.78.203.12610.78.203.127
4910.78.203.128/2910.78.203.129 – 10.78.203.13410.78.203.135
5010.78.203.136/2910.78.203.137 – 10.78.203.14210.78.203.143
5110.78.203.144/2910.78.203.145 – 10.78.203.15010.78.203.151
5210.78.203.152/2910.78.203.153 – 10.78.203.15810.78.203.159
5310.78.203.160/2910.78.203.161 – 10.78.203.16610.78.203.167
5410.78.203.168/2910.78.203.169 – 10.78.203.17410.78.203.175
5510.78.203.176/2910.78.203.177 – 10.78.203.18210.78.203.183
5610.78.203.184/2910.78.203.185 – 10.78.203.19010.78.203.191
5710.78.203.192/2910.78.203.193 – 10.78.203.19810.78.203.199
5810.78.203.200/2910.78.203.201 – 10.78.203.20610.78.203.207
5910.78.203.208/2910.78.203.209 – 10.78.203.21410.78.203.215
6010.78.203.216/2910.78.203.217 – 10.78.203.22210.78.203.223
6110.78.203.224/2910.78.203.225 – 10.78.203.23010.78.203.231
6210.78.203.232/2910.78.203.233 – 10.78.203.23810.78.203.239
6310.78.203.240/2910.78.203.241 – 10.78.203.24610.78.203.247
6410.78.203.248/2910.78.203.249 – 10.78.203.25410.78.203.255
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 →