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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)10.1.208.0/23
network10.1.208.0/23
broadcast10.1.209.255
first host10.1.208.1
last host10.1.209.254
subnet mask255.255.254.0
wildcard0.0.1.255
addresses512
usable hosts510
classA
ipcalc 10.1.208.0/23
address00001010.00000001.11010000.00000000
subnet mask11111111.11111111.11111110.00000000
network00001010.00000001.11010000.00000000
broadcast00001010.00000001.11010001.11111111
green = network part, grey = host part
hex0x0a01d000
decimal167890944
reverse dns0.208.1.10.in-addr.arpa
ipv4-mapped::ffff:a01:d000

/23 split into /29 · 64 subnets

close ×
#networkhost rangebroadcast
110.1.208.0/2910.1.208.1 – 10.1.208.610.1.208.7
210.1.208.8/2910.1.208.9 – 10.1.208.1410.1.208.15
310.1.208.16/2910.1.208.17 – 10.1.208.2210.1.208.23
410.1.208.24/2910.1.208.25 – 10.1.208.3010.1.208.31
510.1.208.32/2910.1.208.33 – 10.1.208.3810.1.208.39
610.1.208.40/2910.1.208.41 – 10.1.208.4610.1.208.47
710.1.208.48/2910.1.208.49 – 10.1.208.5410.1.208.55
810.1.208.56/2910.1.208.57 – 10.1.208.6210.1.208.63
910.1.208.64/2910.1.208.65 – 10.1.208.7010.1.208.71
1010.1.208.72/2910.1.208.73 – 10.1.208.7810.1.208.79
1110.1.208.80/2910.1.208.81 – 10.1.208.8610.1.208.87
1210.1.208.88/2910.1.208.89 – 10.1.208.9410.1.208.95
1310.1.208.96/2910.1.208.97 – 10.1.208.10210.1.208.103
1410.1.208.104/2910.1.208.105 – 10.1.208.11010.1.208.111
1510.1.208.112/2910.1.208.113 – 10.1.208.11810.1.208.119
1610.1.208.120/2910.1.208.121 – 10.1.208.12610.1.208.127
1710.1.208.128/2910.1.208.129 – 10.1.208.13410.1.208.135
1810.1.208.136/2910.1.208.137 – 10.1.208.14210.1.208.143
1910.1.208.144/2910.1.208.145 – 10.1.208.15010.1.208.151
2010.1.208.152/2910.1.208.153 – 10.1.208.15810.1.208.159
2110.1.208.160/2910.1.208.161 – 10.1.208.16610.1.208.167
2210.1.208.168/2910.1.208.169 – 10.1.208.17410.1.208.175
2310.1.208.176/2910.1.208.177 – 10.1.208.18210.1.208.183
2410.1.208.184/2910.1.208.185 – 10.1.208.19010.1.208.191
2510.1.208.192/2910.1.208.193 – 10.1.208.19810.1.208.199
2610.1.208.200/2910.1.208.201 – 10.1.208.20610.1.208.207
2710.1.208.208/2910.1.208.209 – 10.1.208.21410.1.208.215
2810.1.208.216/2910.1.208.217 – 10.1.208.22210.1.208.223
2910.1.208.224/2910.1.208.225 – 10.1.208.23010.1.208.231
3010.1.208.232/2910.1.208.233 – 10.1.208.23810.1.208.239
3110.1.208.240/2910.1.208.241 – 10.1.208.24610.1.208.247
3210.1.208.248/2910.1.208.249 – 10.1.208.25410.1.208.255
3310.1.209.0/2910.1.209.1 – 10.1.209.610.1.209.7
3410.1.209.8/2910.1.209.9 – 10.1.209.1410.1.209.15
3510.1.209.16/2910.1.209.17 – 10.1.209.2210.1.209.23
3610.1.209.24/2910.1.209.25 – 10.1.209.3010.1.209.31
3710.1.209.32/2910.1.209.33 – 10.1.209.3810.1.209.39
3810.1.209.40/2910.1.209.41 – 10.1.209.4610.1.209.47
3910.1.209.48/2910.1.209.49 – 10.1.209.5410.1.209.55
4010.1.209.56/2910.1.209.57 – 10.1.209.6210.1.209.63
4110.1.209.64/2910.1.209.65 – 10.1.209.7010.1.209.71
4210.1.209.72/2910.1.209.73 – 10.1.209.7810.1.209.79
4310.1.209.80/2910.1.209.81 – 10.1.209.8610.1.209.87
4410.1.209.88/2910.1.209.89 – 10.1.209.9410.1.209.95
4510.1.209.96/2910.1.209.97 – 10.1.209.10210.1.209.103
4610.1.209.104/2910.1.209.105 – 10.1.209.11010.1.209.111
4710.1.209.112/2910.1.209.113 – 10.1.209.11810.1.209.119
4810.1.209.120/2910.1.209.121 – 10.1.209.12610.1.209.127
4910.1.209.128/2910.1.209.129 – 10.1.209.13410.1.209.135
5010.1.209.136/2910.1.209.137 – 10.1.209.14210.1.209.143
5110.1.209.144/2910.1.209.145 – 10.1.209.15010.1.209.151
5210.1.209.152/2910.1.209.153 – 10.1.209.15810.1.209.159
5310.1.209.160/2910.1.209.161 – 10.1.209.16610.1.209.167
5410.1.209.168/2910.1.209.169 – 10.1.209.17410.1.209.175
5510.1.209.176/2910.1.209.177 – 10.1.209.18210.1.209.183
5610.1.209.184/2910.1.209.185 – 10.1.209.19010.1.209.191
5710.1.209.192/2910.1.209.193 – 10.1.209.19810.1.209.199
5810.1.209.200/2910.1.209.201 – 10.1.209.20610.1.209.207
5910.1.209.208/2910.1.209.209 – 10.1.209.21410.1.209.215
6010.1.209.216/2910.1.209.217 – 10.1.209.22210.1.209.223
6110.1.209.224/2910.1.209.225 – 10.1.209.23010.1.209.231
6210.1.209.232/2910.1.209.233 – 10.1.209.23810.1.209.239
6310.1.209.240/2910.1.209.241 – 10.1.209.24610.1.209.247
6410.1.209.248/2910.1.209.249 – 10.1.209.25410.1.209.255
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 →