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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)10.1.198.0/23
network10.1.198.0/23
broadcast10.1.199.255
first host10.1.198.1
last host10.1.199.254
subnet mask255.255.254.0
wildcard0.0.1.255
addresses512
usable hosts510
classA
ipcalc 10.1.198.0/23
address00001010.00000001.11000110.00000000
subnet mask11111111.11111111.11111110.00000000
network00001010.00000001.11000110.00000000
broadcast00001010.00000001.11000111.11111111
green = network part, grey = host part
hex0x0a01c600
decimal167888384
reverse dns0.198.1.10.in-addr.arpa
ipv4-mapped::ffff:a01:c600

/23 split into /29 · 64 subnets

close ×
#networkhost rangebroadcast
110.1.198.0/2910.1.198.1 – 10.1.198.610.1.198.7
210.1.198.8/2910.1.198.9 – 10.1.198.1410.1.198.15
310.1.198.16/2910.1.198.17 – 10.1.198.2210.1.198.23
410.1.198.24/2910.1.198.25 – 10.1.198.3010.1.198.31
510.1.198.32/2910.1.198.33 – 10.1.198.3810.1.198.39
610.1.198.40/2910.1.198.41 – 10.1.198.4610.1.198.47
710.1.198.48/2910.1.198.49 – 10.1.198.5410.1.198.55
810.1.198.56/2910.1.198.57 – 10.1.198.6210.1.198.63
910.1.198.64/2910.1.198.65 – 10.1.198.7010.1.198.71
1010.1.198.72/2910.1.198.73 – 10.1.198.7810.1.198.79
1110.1.198.80/2910.1.198.81 – 10.1.198.8610.1.198.87
1210.1.198.88/2910.1.198.89 – 10.1.198.9410.1.198.95
1310.1.198.96/2910.1.198.97 – 10.1.198.10210.1.198.103
1410.1.198.104/2910.1.198.105 – 10.1.198.11010.1.198.111
1510.1.198.112/2910.1.198.113 – 10.1.198.11810.1.198.119
1610.1.198.120/2910.1.198.121 – 10.1.198.12610.1.198.127
1710.1.198.128/2910.1.198.129 – 10.1.198.13410.1.198.135
1810.1.198.136/2910.1.198.137 – 10.1.198.14210.1.198.143
1910.1.198.144/2910.1.198.145 – 10.1.198.15010.1.198.151
2010.1.198.152/2910.1.198.153 – 10.1.198.15810.1.198.159
2110.1.198.160/2910.1.198.161 – 10.1.198.16610.1.198.167
2210.1.198.168/2910.1.198.169 – 10.1.198.17410.1.198.175
2310.1.198.176/2910.1.198.177 – 10.1.198.18210.1.198.183
2410.1.198.184/2910.1.198.185 – 10.1.198.19010.1.198.191
2510.1.198.192/2910.1.198.193 – 10.1.198.19810.1.198.199
2610.1.198.200/2910.1.198.201 – 10.1.198.20610.1.198.207
2710.1.198.208/2910.1.198.209 – 10.1.198.21410.1.198.215
2810.1.198.216/2910.1.198.217 – 10.1.198.22210.1.198.223
2910.1.198.224/2910.1.198.225 – 10.1.198.23010.1.198.231
3010.1.198.232/2910.1.198.233 – 10.1.198.23810.1.198.239
3110.1.198.240/2910.1.198.241 – 10.1.198.24610.1.198.247
3210.1.198.248/2910.1.198.249 – 10.1.198.25410.1.198.255
3310.1.199.0/2910.1.199.1 – 10.1.199.610.1.199.7
3410.1.199.8/2910.1.199.9 – 10.1.199.1410.1.199.15
3510.1.199.16/2910.1.199.17 – 10.1.199.2210.1.199.23
3610.1.199.24/2910.1.199.25 – 10.1.199.3010.1.199.31
3710.1.199.32/2910.1.199.33 – 10.1.199.3810.1.199.39
3810.1.199.40/2910.1.199.41 – 10.1.199.4610.1.199.47
3910.1.199.48/2910.1.199.49 – 10.1.199.5410.1.199.55
4010.1.199.56/2910.1.199.57 – 10.1.199.6210.1.199.63
4110.1.199.64/2910.1.199.65 – 10.1.199.7010.1.199.71
4210.1.199.72/2910.1.199.73 – 10.1.199.7810.1.199.79
4310.1.199.80/2910.1.199.81 – 10.1.199.8610.1.199.87
4410.1.199.88/2910.1.199.89 – 10.1.199.9410.1.199.95
4510.1.199.96/2910.1.199.97 – 10.1.199.10210.1.199.103
4610.1.199.104/2910.1.199.105 – 10.1.199.11010.1.199.111
4710.1.199.112/2910.1.199.113 – 10.1.199.11810.1.199.119
4810.1.199.120/2910.1.199.121 – 10.1.199.12610.1.199.127
4910.1.199.128/2910.1.199.129 – 10.1.199.13410.1.199.135
5010.1.199.136/2910.1.199.137 – 10.1.199.14210.1.199.143
5110.1.199.144/2910.1.199.145 – 10.1.199.15010.1.199.151
5210.1.199.152/2910.1.199.153 – 10.1.199.15810.1.199.159
5310.1.199.160/2910.1.199.161 – 10.1.199.16610.1.199.167
5410.1.199.168/2910.1.199.169 – 10.1.199.17410.1.199.175
5510.1.199.176/2910.1.199.177 – 10.1.199.18210.1.199.183
5610.1.199.184/2910.1.199.185 – 10.1.199.19010.1.199.191
5710.1.199.192/2910.1.199.193 – 10.1.199.19810.1.199.199
5810.1.199.200/2910.1.199.201 – 10.1.199.20610.1.199.207
5910.1.199.208/2910.1.199.209 – 10.1.199.21410.1.199.215
6010.1.199.216/2910.1.199.217 – 10.1.199.22210.1.199.223
6110.1.199.224/2910.1.199.225 – 10.1.199.23010.1.199.231
6210.1.199.232/2910.1.199.233 – 10.1.199.23810.1.199.239
6310.1.199.240/2910.1.199.241 – 10.1.199.24610.1.199.247
6410.1.199.248/2910.1.199.249 – 10.1.199.25410.1.199.255
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 →