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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)10.0.248.0/23
network10.0.248.0/23
broadcast10.0.249.255
first host10.0.248.1
last host10.0.249.254
subnet mask255.255.254.0
wildcard0.0.1.255
addresses512
usable hosts510
classA
ipcalc 10.0.248.0/23
address00001010.00000000.11111000.00000000
subnet mask11111111.11111111.11111110.00000000
network00001010.00000000.11111000.00000000
broadcast00001010.00000000.11111001.11111111
green = network part, grey = host part
hex0x0a00f800
decimal167835648
reverse dns0.248.0.10.in-addr.arpa
ipv4-mapped::ffff:a00:f800

/23 split into /29 · 64 subnets

close ×
#networkhost rangebroadcast
110.0.248.0/2910.0.248.1 – 10.0.248.610.0.248.7
210.0.248.8/2910.0.248.9 – 10.0.248.1410.0.248.15
310.0.248.16/2910.0.248.17 – 10.0.248.2210.0.248.23
410.0.248.24/2910.0.248.25 – 10.0.248.3010.0.248.31
510.0.248.32/2910.0.248.33 – 10.0.248.3810.0.248.39
610.0.248.40/2910.0.248.41 – 10.0.248.4610.0.248.47
710.0.248.48/2910.0.248.49 – 10.0.248.5410.0.248.55
810.0.248.56/2910.0.248.57 – 10.0.248.6210.0.248.63
910.0.248.64/2910.0.248.65 – 10.0.248.7010.0.248.71
1010.0.248.72/2910.0.248.73 – 10.0.248.7810.0.248.79
1110.0.248.80/2910.0.248.81 – 10.0.248.8610.0.248.87
1210.0.248.88/2910.0.248.89 – 10.0.248.9410.0.248.95
1310.0.248.96/2910.0.248.97 – 10.0.248.10210.0.248.103
1410.0.248.104/2910.0.248.105 – 10.0.248.11010.0.248.111
1510.0.248.112/2910.0.248.113 – 10.0.248.11810.0.248.119
1610.0.248.120/2910.0.248.121 – 10.0.248.12610.0.248.127
1710.0.248.128/2910.0.248.129 – 10.0.248.13410.0.248.135
1810.0.248.136/2910.0.248.137 – 10.0.248.14210.0.248.143
1910.0.248.144/2910.0.248.145 – 10.0.248.15010.0.248.151
2010.0.248.152/2910.0.248.153 – 10.0.248.15810.0.248.159
2110.0.248.160/2910.0.248.161 – 10.0.248.16610.0.248.167
2210.0.248.168/2910.0.248.169 – 10.0.248.17410.0.248.175
2310.0.248.176/2910.0.248.177 – 10.0.248.18210.0.248.183
2410.0.248.184/2910.0.248.185 – 10.0.248.19010.0.248.191
2510.0.248.192/2910.0.248.193 – 10.0.248.19810.0.248.199
2610.0.248.200/2910.0.248.201 – 10.0.248.20610.0.248.207
2710.0.248.208/2910.0.248.209 – 10.0.248.21410.0.248.215
2810.0.248.216/2910.0.248.217 – 10.0.248.22210.0.248.223
2910.0.248.224/2910.0.248.225 – 10.0.248.23010.0.248.231
3010.0.248.232/2910.0.248.233 – 10.0.248.23810.0.248.239
3110.0.248.240/2910.0.248.241 – 10.0.248.24610.0.248.247
3210.0.248.248/2910.0.248.249 – 10.0.248.25410.0.248.255
3310.0.249.0/2910.0.249.1 – 10.0.249.610.0.249.7
3410.0.249.8/2910.0.249.9 – 10.0.249.1410.0.249.15
3510.0.249.16/2910.0.249.17 – 10.0.249.2210.0.249.23
3610.0.249.24/2910.0.249.25 – 10.0.249.3010.0.249.31
3710.0.249.32/2910.0.249.33 – 10.0.249.3810.0.249.39
3810.0.249.40/2910.0.249.41 – 10.0.249.4610.0.249.47
3910.0.249.48/2910.0.249.49 – 10.0.249.5410.0.249.55
4010.0.249.56/2910.0.249.57 – 10.0.249.6210.0.249.63
4110.0.249.64/2910.0.249.65 – 10.0.249.7010.0.249.71
4210.0.249.72/2910.0.249.73 – 10.0.249.7810.0.249.79
4310.0.249.80/2910.0.249.81 – 10.0.249.8610.0.249.87
4410.0.249.88/2910.0.249.89 – 10.0.249.9410.0.249.95
4510.0.249.96/2910.0.249.97 – 10.0.249.10210.0.249.103
4610.0.249.104/2910.0.249.105 – 10.0.249.11010.0.249.111
4710.0.249.112/2910.0.249.113 – 10.0.249.11810.0.249.119
4810.0.249.120/2910.0.249.121 – 10.0.249.12610.0.249.127
4910.0.249.128/2910.0.249.129 – 10.0.249.13410.0.249.135
5010.0.249.136/2910.0.249.137 – 10.0.249.14210.0.249.143
5110.0.249.144/2910.0.249.145 – 10.0.249.15010.0.249.151
5210.0.249.152/2910.0.249.153 – 10.0.249.15810.0.249.159
5310.0.249.160/2910.0.249.161 – 10.0.249.16610.0.249.167
5410.0.249.168/2910.0.249.169 – 10.0.249.17410.0.249.175
5510.0.249.176/2910.0.249.177 – 10.0.249.18210.0.249.183
5610.0.249.184/2910.0.249.185 – 10.0.249.19010.0.249.191
5710.0.249.192/2910.0.249.193 – 10.0.249.19810.0.249.199
5810.0.249.200/2910.0.249.201 – 10.0.249.20610.0.249.207
5910.0.249.208/2910.0.249.209 – 10.0.249.21410.0.249.215
6010.0.249.216/2910.0.249.217 – 10.0.249.22210.0.249.223
6110.0.249.224/2910.0.249.225 – 10.0.249.23010.0.249.231
6210.0.249.232/2910.0.249.233 – 10.0.249.23810.0.249.239
6310.0.249.240/2910.0.249.241 – 10.0.249.24610.0.249.247
6410.0.249.248/2910.0.249.249 – 10.0.249.25410.0.249.255
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 →