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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)10.1.86.0/23
network10.1.86.0/23
broadcast10.1.87.255
first host10.1.86.1
last host10.1.87.254
subnet mask255.255.254.0
wildcard0.0.1.255
addresses512
usable hosts510
classA
ipcalc 10.1.86.0/23
address00001010.00000001.01010110.00000000
subnet mask11111111.11111111.11111110.00000000
network00001010.00000001.01010110.00000000
broadcast00001010.00000001.01010111.11111111
green = network part, grey = host part
hex0x0a015600
decimal167859712
reverse dns0.86.1.10.in-addr.arpa
ipv4-mapped::ffff:a01:5600

/23 split into /29 · 64 subnets

close ×
#networkhost rangebroadcast
110.1.86.0/2910.1.86.1 – 10.1.86.610.1.86.7
210.1.86.8/2910.1.86.9 – 10.1.86.1410.1.86.15
310.1.86.16/2910.1.86.17 – 10.1.86.2210.1.86.23
410.1.86.24/2910.1.86.25 – 10.1.86.3010.1.86.31
510.1.86.32/2910.1.86.33 – 10.1.86.3810.1.86.39
610.1.86.40/2910.1.86.41 – 10.1.86.4610.1.86.47
710.1.86.48/2910.1.86.49 – 10.1.86.5410.1.86.55
810.1.86.56/2910.1.86.57 – 10.1.86.6210.1.86.63
910.1.86.64/2910.1.86.65 – 10.1.86.7010.1.86.71
1010.1.86.72/2910.1.86.73 – 10.1.86.7810.1.86.79
1110.1.86.80/2910.1.86.81 – 10.1.86.8610.1.86.87
1210.1.86.88/2910.1.86.89 – 10.1.86.9410.1.86.95
1310.1.86.96/2910.1.86.97 – 10.1.86.10210.1.86.103
1410.1.86.104/2910.1.86.105 – 10.1.86.11010.1.86.111
1510.1.86.112/2910.1.86.113 – 10.1.86.11810.1.86.119
1610.1.86.120/2910.1.86.121 – 10.1.86.12610.1.86.127
1710.1.86.128/2910.1.86.129 – 10.1.86.13410.1.86.135
1810.1.86.136/2910.1.86.137 – 10.1.86.14210.1.86.143
1910.1.86.144/2910.1.86.145 – 10.1.86.15010.1.86.151
2010.1.86.152/2910.1.86.153 – 10.1.86.15810.1.86.159
2110.1.86.160/2910.1.86.161 – 10.1.86.16610.1.86.167
2210.1.86.168/2910.1.86.169 – 10.1.86.17410.1.86.175
2310.1.86.176/2910.1.86.177 – 10.1.86.18210.1.86.183
2410.1.86.184/2910.1.86.185 – 10.1.86.19010.1.86.191
2510.1.86.192/2910.1.86.193 – 10.1.86.19810.1.86.199
2610.1.86.200/2910.1.86.201 – 10.1.86.20610.1.86.207
2710.1.86.208/2910.1.86.209 – 10.1.86.21410.1.86.215
2810.1.86.216/2910.1.86.217 – 10.1.86.22210.1.86.223
2910.1.86.224/2910.1.86.225 – 10.1.86.23010.1.86.231
3010.1.86.232/2910.1.86.233 – 10.1.86.23810.1.86.239
3110.1.86.240/2910.1.86.241 – 10.1.86.24610.1.86.247
3210.1.86.248/2910.1.86.249 – 10.1.86.25410.1.86.255
3310.1.87.0/2910.1.87.1 – 10.1.87.610.1.87.7
3410.1.87.8/2910.1.87.9 – 10.1.87.1410.1.87.15
3510.1.87.16/2910.1.87.17 – 10.1.87.2210.1.87.23
3610.1.87.24/2910.1.87.25 – 10.1.87.3010.1.87.31
3710.1.87.32/2910.1.87.33 – 10.1.87.3810.1.87.39
3810.1.87.40/2910.1.87.41 – 10.1.87.4610.1.87.47
3910.1.87.48/2910.1.87.49 – 10.1.87.5410.1.87.55
4010.1.87.56/2910.1.87.57 – 10.1.87.6210.1.87.63
4110.1.87.64/2910.1.87.65 – 10.1.87.7010.1.87.71
4210.1.87.72/2910.1.87.73 – 10.1.87.7810.1.87.79
4310.1.87.80/2910.1.87.81 – 10.1.87.8610.1.87.87
4410.1.87.88/2910.1.87.89 – 10.1.87.9410.1.87.95
4510.1.87.96/2910.1.87.97 – 10.1.87.10210.1.87.103
4610.1.87.104/2910.1.87.105 – 10.1.87.11010.1.87.111
4710.1.87.112/2910.1.87.113 – 10.1.87.11810.1.87.119
4810.1.87.120/2910.1.87.121 – 10.1.87.12610.1.87.127
4910.1.87.128/2910.1.87.129 – 10.1.87.13410.1.87.135
5010.1.87.136/2910.1.87.137 – 10.1.87.14210.1.87.143
5110.1.87.144/2910.1.87.145 – 10.1.87.15010.1.87.151
5210.1.87.152/2910.1.87.153 – 10.1.87.15810.1.87.159
5310.1.87.160/2910.1.87.161 – 10.1.87.16610.1.87.167
5410.1.87.168/2910.1.87.169 – 10.1.87.17410.1.87.175
5510.1.87.176/2910.1.87.177 – 10.1.87.18210.1.87.183
5610.1.87.184/2910.1.87.185 – 10.1.87.19010.1.87.191
5710.1.87.192/2910.1.87.193 – 10.1.87.19810.1.87.199
5810.1.87.200/2910.1.87.201 – 10.1.87.20610.1.87.207
5910.1.87.208/2910.1.87.209 – 10.1.87.21410.1.87.215
6010.1.87.216/2910.1.87.217 – 10.1.87.22210.1.87.223
6110.1.87.224/2910.1.87.225 – 10.1.87.23010.1.87.231
6210.1.87.232/2910.1.87.233 – 10.1.87.23810.1.87.239
6310.1.87.240/2910.1.87.241 – 10.1.87.24610.1.87.247
6410.1.87.248/2910.1.87.249 – 10.1.87.25410.1.87.255
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 →