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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)10.2.56.0/23
network10.2.56.0/23
broadcast10.2.57.255
first host10.2.56.1
last host10.2.57.254
subnet mask255.255.254.0
wildcard0.0.1.255
addresses512
usable hosts510
classA
ipcalc 10.2.56.0/23
address00001010.00000010.00111000.00000000
subnet mask11111111.11111111.11111110.00000000
network00001010.00000010.00111000.00000000
broadcast00001010.00000010.00111001.11111111
green = network part, grey = host part
hex0x0a023800
decimal167917568
reverse dns0.56.2.10.in-addr.arpa
ipv4-mapped::ffff:a02:3800

/23 split into /29 · 64 subnets

close ×
#networkhost rangebroadcast
110.2.56.0/2910.2.56.1 – 10.2.56.610.2.56.7
210.2.56.8/2910.2.56.9 – 10.2.56.1410.2.56.15
310.2.56.16/2910.2.56.17 – 10.2.56.2210.2.56.23
410.2.56.24/2910.2.56.25 – 10.2.56.3010.2.56.31
510.2.56.32/2910.2.56.33 – 10.2.56.3810.2.56.39
610.2.56.40/2910.2.56.41 – 10.2.56.4610.2.56.47
710.2.56.48/2910.2.56.49 – 10.2.56.5410.2.56.55
810.2.56.56/2910.2.56.57 – 10.2.56.6210.2.56.63
910.2.56.64/2910.2.56.65 – 10.2.56.7010.2.56.71
1010.2.56.72/2910.2.56.73 – 10.2.56.7810.2.56.79
1110.2.56.80/2910.2.56.81 – 10.2.56.8610.2.56.87
1210.2.56.88/2910.2.56.89 – 10.2.56.9410.2.56.95
1310.2.56.96/2910.2.56.97 – 10.2.56.10210.2.56.103
1410.2.56.104/2910.2.56.105 – 10.2.56.11010.2.56.111
1510.2.56.112/2910.2.56.113 – 10.2.56.11810.2.56.119
1610.2.56.120/2910.2.56.121 – 10.2.56.12610.2.56.127
1710.2.56.128/2910.2.56.129 – 10.2.56.13410.2.56.135
1810.2.56.136/2910.2.56.137 – 10.2.56.14210.2.56.143
1910.2.56.144/2910.2.56.145 – 10.2.56.15010.2.56.151
2010.2.56.152/2910.2.56.153 – 10.2.56.15810.2.56.159
2110.2.56.160/2910.2.56.161 – 10.2.56.16610.2.56.167
2210.2.56.168/2910.2.56.169 – 10.2.56.17410.2.56.175
2310.2.56.176/2910.2.56.177 – 10.2.56.18210.2.56.183
2410.2.56.184/2910.2.56.185 – 10.2.56.19010.2.56.191
2510.2.56.192/2910.2.56.193 – 10.2.56.19810.2.56.199
2610.2.56.200/2910.2.56.201 – 10.2.56.20610.2.56.207
2710.2.56.208/2910.2.56.209 – 10.2.56.21410.2.56.215
2810.2.56.216/2910.2.56.217 – 10.2.56.22210.2.56.223
2910.2.56.224/2910.2.56.225 – 10.2.56.23010.2.56.231
3010.2.56.232/2910.2.56.233 – 10.2.56.23810.2.56.239
3110.2.56.240/2910.2.56.241 – 10.2.56.24610.2.56.247
3210.2.56.248/2910.2.56.249 – 10.2.56.25410.2.56.255
3310.2.57.0/2910.2.57.1 – 10.2.57.610.2.57.7
3410.2.57.8/2910.2.57.9 – 10.2.57.1410.2.57.15
3510.2.57.16/2910.2.57.17 – 10.2.57.2210.2.57.23
3610.2.57.24/2910.2.57.25 – 10.2.57.3010.2.57.31
3710.2.57.32/2910.2.57.33 – 10.2.57.3810.2.57.39
3810.2.57.40/2910.2.57.41 – 10.2.57.4610.2.57.47
3910.2.57.48/2910.2.57.49 – 10.2.57.5410.2.57.55
4010.2.57.56/2910.2.57.57 – 10.2.57.6210.2.57.63
4110.2.57.64/2910.2.57.65 – 10.2.57.7010.2.57.71
4210.2.57.72/2910.2.57.73 – 10.2.57.7810.2.57.79
4310.2.57.80/2910.2.57.81 – 10.2.57.8610.2.57.87
4410.2.57.88/2910.2.57.89 – 10.2.57.9410.2.57.95
4510.2.57.96/2910.2.57.97 – 10.2.57.10210.2.57.103
4610.2.57.104/2910.2.57.105 – 10.2.57.11010.2.57.111
4710.2.57.112/2910.2.57.113 – 10.2.57.11810.2.57.119
4810.2.57.120/2910.2.57.121 – 10.2.57.12610.2.57.127
4910.2.57.128/2910.2.57.129 – 10.2.57.13410.2.57.135
5010.2.57.136/2910.2.57.137 – 10.2.57.14210.2.57.143
5110.2.57.144/2910.2.57.145 – 10.2.57.15010.2.57.151
5210.2.57.152/2910.2.57.153 – 10.2.57.15810.2.57.159
5310.2.57.160/2910.2.57.161 – 10.2.57.16610.2.57.167
5410.2.57.168/2910.2.57.169 – 10.2.57.17410.2.57.175
5510.2.57.176/2910.2.57.177 – 10.2.57.18210.2.57.183
5610.2.57.184/2910.2.57.185 – 10.2.57.19010.2.57.191
5710.2.57.192/2910.2.57.193 – 10.2.57.19810.2.57.199
5810.2.57.200/2910.2.57.201 – 10.2.57.20610.2.57.207
5910.2.57.208/2910.2.57.209 – 10.2.57.21410.2.57.215
6010.2.57.216/2910.2.57.217 – 10.2.57.22210.2.57.223
6110.2.57.224/2910.2.57.225 – 10.2.57.23010.2.57.231
6210.2.57.232/2910.2.57.233 – 10.2.57.23810.2.57.239
6310.2.57.240/2910.2.57.241 – 10.2.57.24610.2.57.247
6410.2.57.248/2910.2.57.249 – 10.2.57.25410.2.57.255
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 →