ip
ipku.in

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)10.85.236.0/23
network10.85.236.0/23
broadcast10.85.237.255
first host10.85.236.1
last host10.85.237.254
subnet mask255.255.254.0
wildcard0.0.1.255
addresses512
usable hosts510
classA
ipcalc 10.85.236.0/23
address00001010.01010101.11101100.00000000
subnet mask11111111.11111111.11111110.00000000
network00001010.01010101.11101100.00000000
broadcast00001010.01010101.11101101.11111111
green = network part, grey = host part
hex0x0a55ec00
decimal173403136
reverse dns0.236.85.10.in-addr.arpa
ipv4-mapped::ffff:a55:ec00

/23 split into /29 · 64 subnets

close ×
#networkhost rangebroadcast
110.85.236.0/2910.85.236.1 – 10.85.236.610.85.236.7
210.85.236.8/2910.85.236.9 – 10.85.236.1410.85.236.15
310.85.236.16/2910.85.236.17 – 10.85.236.2210.85.236.23
410.85.236.24/2910.85.236.25 – 10.85.236.3010.85.236.31
510.85.236.32/2910.85.236.33 – 10.85.236.3810.85.236.39
610.85.236.40/2910.85.236.41 – 10.85.236.4610.85.236.47
710.85.236.48/2910.85.236.49 – 10.85.236.5410.85.236.55
810.85.236.56/2910.85.236.57 – 10.85.236.6210.85.236.63
910.85.236.64/2910.85.236.65 – 10.85.236.7010.85.236.71
1010.85.236.72/2910.85.236.73 – 10.85.236.7810.85.236.79
1110.85.236.80/2910.85.236.81 – 10.85.236.8610.85.236.87
1210.85.236.88/2910.85.236.89 – 10.85.236.9410.85.236.95
1310.85.236.96/2910.85.236.97 – 10.85.236.10210.85.236.103
1410.85.236.104/2910.85.236.105 – 10.85.236.11010.85.236.111
1510.85.236.112/2910.85.236.113 – 10.85.236.11810.85.236.119
1610.85.236.120/2910.85.236.121 – 10.85.236.12610.85.236.127
1710.85.236.128/2910.85.236.129 – 10.85.236.13410.85.236.135
1810.85.236.136/2910.85.236.137 – 10.85.236.14210.85.236.143
1910.85.236.144/2910.85.236.145 – 10.85.236.15010.85.236.151
2010.85.236.152/2910.85.236.153 – 10.85.236.15810.85.236.159
2110.85.236.160/2910.85.236.161 – 10.85.236.16610.85.236.167
2210.85.236.168/2910.85.236.169 – 10.85.236.17410.85.236.175
2310.85.236.176/2910.85.236.177 – 10.85.236.18210.85.236.183
2410.85.236.184/2910.85.236.185 – 10.85.236.19010.85.236.191
2510.85.236.192/2910.85.236.193 – 10.85.236.19810.85.236.199
2610.85.236.200/2910.85.236.201 – 10.85.236.20610.85.236.207
2710.85.236.208/2910.85.236.209 – 10.85.236.21410.85.236.215
2810.85.236.216/2910.85.236.217 – 10.85.236.22210.85.236.223
2910.85.236.224/2910.85.236.225 – 10.85.236.23010.85.236.231
3010.85.236.232/2910.85.236.233 – 10.85.236.23810.85.236.239
3110.85.236.240/2910.85.236.241 – 10.85.236.24610.85.236.247
3210.85.236.248/2910.85.236.249 – 10.85.236.25410.85.236.255
3310.85.237.0/2910.85.237.1 – 10.85.237.610.85.237.7
3410.85.237.8/2910.85.237.9 – 10.85.237.1410.85.237.15
3510.85.237.16/2910.85.237.17 – 10.85.237.2210.85.237.23
3610.85.237.24/2910.85.237.25 – 10.85.237.3010.85.237.31
3710.85.237.32/2910.85.237.33 – 10.85.237.3810.85.237.39
3810.85.237.40/2910.85.237.41 – 10.85.237.4610.85.237.47
3910.85.237.48/2910.85.237.49 – 10.85.237.5410.85.237.55
4010.85.237.56/2910.85.237.57 – 10.85.237.6210.85.237.63
4110.85.237.64/2910.85.237.65 – 10.85.237.7010.85.237.71
4210.85.237.72/2910.85.237.73 – 10.85.237.7810.85.237.79
4310.85.237.80/2910.85.237.81 – 10.85.237.8610.85.237.87
4410.85.237.88/2910.85.237.89 – 10.85.237.9410.85.237.95
4510.85.237.96/2910.85.237.97 – 10.85.237.10210.85.237.103
4610.85.237.104/2910.85.237.105 – 10.85.237.11010.85.237.111
4710.85.237.112/2910.85.237.113 – 10.85.237.11810.85.237.119
4810.85.237.120/2910.85.237.121 – 10.85.237.12610.85.237.127
4910.85.237.128/2910.85.237.129 – 10.85.237.13410.85.237.135
5010.85.237.136/2910.85.237.137 – 10.85.237.14210.85.237.143
5110.85.237.144/2910.85.237.145 – 10.85.237.15010.85.237.151
5210.85.237.152/2910.85.237.153 – 10.85.237.15810.85.237.159
5310.85.237.160/2910.85.237.161 – 10.85.237.16610.85.237.167
5410.85.237.168/2910.85.237.169 – 10.85.237.17410.85.237.175
5510.85.237.176/2910.85.237.177 – 10.85.237.18210.85.237.183
5610.85.237.184/2910.85.237.185 – 10.85.237.19010.85.237.191
5710.85.237.192/2910.85.237.193 – 10.85.237.19810.85.237.199
5810.85.237.200/2910.85.237.201 – 10.85.237.20610.85.237.207
5910.85.237.208/2910.85.237.209 – 10.85.237.21410.85.237.215
6010.85.237.216/2910.85.237.217 – 10.85.237.22210.85.237.223
6110.85.237.224/2910.85.237.225 – 10.85.237.23010.85.237.231
6210.85.237.232/2910.85.237.233 – 10.85.237.23810.85.237.239
6310.85.237.240/2910.85.237.241 – 10.85.237.24610.85.237.247
6410.85.237.248/2910.85.237.249 – 10.85.237.25410.85.237.255
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 →