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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)10.1.204.0/23
network10.1.204.0/23
broadcast10.1.205.255
first host10.1.204.1
last host10.1.205.254
subnet mask255.255.254.0
wildcard0.0.1.255
addresses512
usable hosts510
classA
ipcalc 10.1.204.0/23
address00001010.00000001.11001100.00000000
subnet mask11111111.11111111.11111110.00000000
network00001010.00000001.11001100.00000000
broadcast00001010.00000001.11001101.11111111
green = network part, grey = host part
hex0x0a01cc00
decimal167889920
reverse dns0.204.1.10.in-addr.arpa
ipv4-mapped::ffff:a01:cc00

/23 split into /29 · 64 subnets

close ×
#networkhost rangebroadcast
110.1.204.0/2910.1.204.1 – 10.1.204.610.1.204.7
210.1.204.8/2910.1.204.9 – 10.1.204.1410.1.204.15
310.1.204.16/2910.1.204.17 – 10.1.204.2210.1.204.23
410.1.204.24/2910.1.204.25 – 10.1.204.3010.1.204.31
510.1.204.32/2910.1.204.33 – 10.1.204.3810.1.204.39
610.1.204.40/2910.1.204.41 – 10.1.204.4610.1.204.47
710.1.204.48/2910.1.204.49 – 10.1.204.5410.1.204.55
810.1.204.56/2910.1.204.57 – 10.1.204.6210.1.204.63
910.1.204.64/2910.1.204.65 – 10.1.204.7010.1.204.71
1010.1.204.72/2910.1.204.73 – 10.1.204.7810.1.204.79
1110.1.204.80/2910.1.204.81 – 10.1.204.8610.1.204.87
1210.1.204.88/2910.1.204.89 – 10.1.204.9410.1.204.95
1310.1.204.96/2910.1.204.97 – 10.1.204.10210.1.204.103
1410.1.204.104/2910.1.204.105 – 10.1.204.11010.1.204.111
1510.1.204.112/2910.1.204.113 – 10.1.204.11810.1.204.119
1610.1.204.120/2910.1.204.121 – 10.1.204.12610.1.204.127
1710.1.204.128/2910.1.204.129 – 10.1.204.13410.1.204.135
1810.1.204.136/2910.1.204.137 – 10.1.204.14210.1.204.143
1910.1.204.144/2910.1.204.145 – 10.1.204.15010.1.204.151
2010.1.204.152/2910.1.204.153 – 10.1.204.15810.1.204.159
2110.1.204.160/2910.1.204.161 – 10.1.204.16610.1.204.167
2210.1.204.168/2910.1.204.169 – 10.1.204.17410.1.204.175
2310.1.204.176/2910.1.204.177 – 10.1.204.18210.1.204.183
2410.1.204.184/2910.1.204.185 – 10.1.204.19010.1.204.191
2510.1.204.192/2910.1.204.193 – 10.1.204.19810.1.204.199
2610.1.204.200/2910.1.204.201 – 10.1.204.20610.1.204.207
2710.1.204.208/2910.1.204.209 – 10.1.204.21410.1.204.215
2810.1.204.216/2910.1.204.217 – 10.1.204.22210.1.204.223
2910.1.204.224/2910.1.204.225 – 10.1.204.23010.1.204.231
3010.1.204.232/2910.1.204.233 – 10.1.204.23810.1.204.239
3110.1.204.240/2910.1.204.241 – 10.1.204.24610.1.204.247
3210.1.204.248/2910.1.204.249 – 10.1.204.25410.1.204.255
3310.1.205.0/2910.1.205.1 – 10.1.205.610.1.205.7
3410.1.205.8/2910.1.205.9 – 10.1.205.1410.1.205.15
3510.1.205.16/2910.1.205.17 – 10.1.205.2210.1.205.23
3610.1.205.24/2910.1.205.25 – 10.1.205.3010.1.205.31
3710.1.205.32/2910.1.205.33 – 10.1.205.3810.1.205.39
3810.1.205.40/2910.1.205.41 – 10.1.205.4610.1.205.47
3910.1.205.48/2910.1.205.49 – 10.1.205.5410.1.205.55
4010.1.205.56/2910.1.205.57 – 10.1.205.6210.1.205.63
4110.1.205.64/2910.1.205.65 – 10.1.205.7010.1.205.71
4210.1.205.72/2910.1.205.73 – 10.1.205.7810.1.205.79
4310.1.205.80/2910.1.205.81 – 10.1.205.8610.1.205.87
4410.1.205.88/2910.1.205.89 – 10.1.205.9410.1.205.95
4510.1.205.96/2910.1.205.97 – 10.1.205.10210.1.205.103
4610.1.205.104/2910.1.205.105 – 10.1.205.11010.1.205.111
4710.1.205.112/2910.1.205.113 – 10.1.205.11810.1.205.119
4810.1.205.120/2910.1.205.121 – 10.1.205.12610.1.205.127
4910.1.205.128/2910.1.205.129 – 10.1.205.13410.1.205.135
5010.1.205.136/2910.1.205.137 – 10.1.205.14210.1.205.143
5110.1.205.144/2910.1.205.145 – 10.1.205.15010.1.205.151
5210.1.205.152/2910.1.205.153 – 10.1.205.15810.1.205.159
5310.1.205.160/2910.1.205.161 – 10.1.205.16610.1.205.167
5410.1.205.168/2910.1.205.169 – 10.1.205.17410.1.205.175
5510.1.205.176/2910.1.205.177 – 10.1.205.18210.1.205.183
5610.1.205.184/2910.1.205.185 – 10.1.205.19010.1.205.191
5710.1.205.192/2910.1.205.193 – 10.1.205.19810.1.205.199
5810.1.205.200/2910.1.205.201 – 10.1.205.20610.1.205.207
5910.1.205.208/2910.1.205.209 – 10.1.205.21410.1.205.215
6010.1.205.216/2910.1.205.217 – 10.1.205.22210.1.205.223
6110.1.205.224/2910.1.205.225 – 10.1.205.23010.1.205.231
6210.1.205.232/2910.1.205.233 – 10.1.205.23810.1.205.239
6310.1.205.240/2910.1.205.241 – 10.1.205.24610.1.205.247
6410.1.205.248/2910.1.205.249 – 10.1.205.25410.1.205.255
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 →