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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)10.2.58.0/23
network10.2.58.0/23
broadcast10.2.59.255
first host10.2.58.1
last host10.2.59.254
subnet mask255.255.254.0
wildcard0.0.1.255
addresses512
usable hosts510
classA
ipcalc 10.2.58.0/23
address00001010.00000010.00111010.00000000
subnet mask11111111.11111111.11111110.00000000
network00001010.00000010.00111010.00000000
broadcast00001010.00000010.00111011.11111111
green = network part, grey = host part
hex0x0a023a00
decimal167918080
reverse dns0.58.2.10.in-addr.arpa
ipv4-mapped::ffff:a02:3a00

/23 split into /29 · 64 subnets

close ×
#networkhost rangebroadcast
110.2.58.0/2910.2.58.1 – 10.2.58.610.2.58.7
210.2.58.8/2910.2.58.9 – 10.2.58.1410.2.58.15
310.2.58.16/2910.2.58.17 – 10.2.58.2210.2.58.23
410.2.58.24/2910.2.58.25 – 10.2.58.3010.2.58.31
510.2.58.32/2910.2.58.33 – 10.2.58.3810.2.58.39
610.2.58.40/2910.2.58.41 – 10.2.58.4610.2.58.47
710.2.58.48/2910.2.58.49 – 10.2.58.5410.2.58.55
810.2.58.56/2910.2.58.57 – 10.2.58.6210.2.58.63
910.2.58.64/2910.2.58.65 – 10.2.58.7010.2.58.71
1010.2.58.72/2910.2.58.73 – 10.2.58.7810.2.58.79
1110.2.58.80/2910.2.58.81 – 10.2.58.8610.2.58.87
1210.2.58.88/2910.2.58.89 – 10.2.58.9410.2.58.95
1310.2.58.96/2910.2.58.97 – 10.2.58.10210.2.58.103
1410.2.58.104/2910.2.58.105 – 10.2.58.11010.2.58.111
1510.2.58.112/2910.2.58.113 – 10.2.58.11810.2.58.119
1610.2.58.120/2910.2.58.121 – 10.2.58.12610.2.58.127
1710.2.58.128/2910.2.58.129 – 10.2.58.13410.2.58.135
1810.2.58.136/2910.2.58.137 – 10.2.58.14210.2.58.143
1910.2.58.144/2910.2.58.145 – 10.2.58.15010.2.58.151
2010.2.58.152/2910.2.58.153 – 10.2.58.15810.2.58.159
2110.2.58.160/2910.2.58.161 – 10.2.58.16610.2.58.167
2210.2.58.168/2910.2.58.169 – 10.2.58.17410.2.58.175
2310.2.58.176/2910.2.58.177 – 10.2.58.18210.2.58.183
2410.2.58.184/2910.2.58.185 – 10.2.58.19010.2.58.191
2510.2.58.192/2910.2.58.193 – 10.2.58.19810.2.58.199
2610.2.58.200/2910.2.58.201 – 10.2.58.20610.2.58.207
2710.2.58.208/2910.2.58.209 – 10.2.58.21410.2.58.215
2810.2.58.216/2910.2.58.217 – 10.2.58.22210.2.58.223
2910.2.58.224/2910.2.58.225 – 10.2.58.23010.2.58.231
3010.2.58.232/2910.2.58.233 – 10.2.58.23810.2.58.239
3110.2.58.240/2910.2.58.241 – 10.2.58.24610.2.58.247
3210.2.58.248/2910.2.58.249 – 10.2.58.25410.2.58.255
3310.2.59.0/2910.2.59.1 – 10.2.59.610.2.59.7
3410.2.59.8/2910.2.59.9 – 10.2.59.1410.2.59.15
3510.2.59.16/2910.2.59.17 – 10.2.59.2210.2.59.23
3610.2.59.24/2910.2.59.25 – 10.2.59.3010.2.59.31
3710.2.59.32/2910.2.59.33 – 10.2.59.3810.2.59.39
3810.2.59.40/2910.2.59.41 – 10.2.59.4610.2.59.47
3910.2.59.48/2910.2.59.49 – 10.2.59.5410.2.59.55
4010.2.59.56/2910.2.59.57 – 10.2.59.6210.2.59.63
4110.2.59.64/2910.2.59.65 – 10.2.59.7010.2.59.71
4210.2.59.72/2910.2.59.73 – 10.2.59.7810.2.59.79
4310.2.59.80/2910.2.59.81 – 10.2.59.8610.2.59.87
4410.2.59.88/2910.2.59.89 – 10.2.59.9410.2.59.95
4510.2.59.96/2910.2.59.97 – 10.2.59.10210.2.59.103
4610.2.59.104/2910.2.59.105 – 10.2.59.11010.2.59.111
4710.2.59.112/2910.2.59.113 – 10.2.59.11810.2.59.119
4810.2.59.120/2910.2.59.121 – 10.2.59.12610.2.59.127
4910.2.59.128/2910.2.59.129 – 10.2.59.13410.2.59.135
5010.2.59.136/2910.2.59.137 – 10.2.59.14210.2.59.143
5110.2.59.144/2910.2.59.145 – 10.2.59.15010.2.59.151
5210.2.59.152/2910.2.59.153 – 10.2.59.15810.2.59.159
5310.2.59.160/2910.2.59.161 – 10.2.59.16610.2.59.167
5410.2.59.168/2910.2.59.169 – 10.2.59.17410.2.59.175
5510.2.59.176/2910.2.59.177 – 10.2.59.18210.2.59.183
5610.2.59.184/2910.2.59.185 – 10.2.59.19010.2.59.191
5710.2.59.192/2910.2.59.193 – 10.2.59.19810.2.59.199
5810.2.59.200/2910.2.59.201 – 10.2.59.20610.2.59.207
5910.2.59.208/2910.2.59.209 – 10.2.59.21410.2.59.215
6010.2.59.216/2910.2.59.217 – 10.2.59.22210.2.59.223
6110.2.59.224/2910.2.59.225 – 10.2.59.23010.2.59.231
6210.2.59.232/2910.2.59.233 – 10.2.59.23810.2.59.239
6310.2.59.240/2910.2.59.241 – 10.2.59.24610.2.59.247
6410.2.59.248/2910.2.59.249 – 10.2.59.25410.2.59.255
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 →