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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)10.2.84.0/23
network10.2.84.0/23
broadcast10.2.85.255
first host10.2.84.1
last host10.2.85.254
subnet mask255.255.254.0
wildcard0.0.1.255
addresses512
usable hosts510
classA
ipcalc 10.2.84.0/23
address00001010.00000010.01010100.00000000
subnet mask11111111.11111111.11111110.00000000
network00001010.00000010.01010100.00000000
broadcast00001010.00000010.01010101.11111111
green = network part, grey = host part
hex0x0a025400
decimal167924736
reverse dns0.84.2.10.in-addr.arpa
ipv4-mapped::ffff:a02:5400

/23 split into /29 · 64 subnets

close ×
#networkhost rangebroadcast
110.2.84.0/2910.2.84.1 – 10.2.84.610.2.84.7
210.2.84.8/2910.2.84.9 – 10.2.84.1410.2.84.15
310.2.84.16/2910.2.84.17 – 10.2.84.2210.2.84.23
410.2.84.24/2910.2.84.25 – 10.2.84.3010.2.84.31
510.2.84.32/2910.2.84.33 – 10.2.84.3810.2.84.39
610.2.84.40/2910.2.84.41 – 10.2.84.4610.2.84.47
710.2.84.48/2910.2.84.49 – 10.2.84.5410.2.84.55
810.2.84.56/2910.2.84.57 – 10.2.84.6210.2.84.63
910.2.84.64/2910.2.84.65 – 10.2.84.7010.2.84.71
1010.2.84.72/2910.2.84.73 – 10.2.84.7810.2.84.79
1110.2.84.80/2910.2.84.81 – 10.2.84.8610.2.84.87
1210.2.84.88/2910.2.84.89 – 10.2.84.9410.2.84.95
1310.2.84.96/2910.2.84.97 – 10.2.84.10210.2.84.103
1410.2.84.104/2910.2.84.105 – 10.2.84.11010.2.84.111
1510.2.84.112/2910.2.84.113 – 10.2.84.11810.2.84.119
1610.2.84.120/2910.2.84.121 – 10.2.84.12610.2.84.127
1710.2.84.128/2910.2.84.129 – 10.2.84.13410.2.84.135
1810.2.84.136/2910.2.84.137 – 10.2.84.14210.2.84.143
1910.2.84.144/2910.2.84.145 – 10.2.84.15010.2.84.151
2010.2.84.152/2910.2.84.153 – 10.2.84.15810.2.84.159
2110.2.84.160/2910.2.84.161 – 10.2.84.16610.2.84.167
2210.2.84.168/2910.2.84.169 – 10.2.84.17410.2.84.175
2310.2.84.176/2910.2.84.177 – 10.2.84.18210.2.84.183
2410.2.84.184/2910.2.84.185 – 10.2.84.19010.2.84.191
2510.2.84.192/2910.2.84.193 – 10.2.84.19810.2.84.199
2610.2.84.200/2910.2.84.201 – 10.2.84.20610.2.84.207
2710.2.84.208/2910.2.84.209 – 10.2.84.21410.2.84.215
2810.2.84.216/2910.2.84.217 – 10.2.84.22210.2.84.223
2910.2.84.224/2910.2.84.225 – 10.2.84.23010.2.84.231
3010.2.84.232/2910.2.84.233 – 10.2.84.23810.2.84.239
3110.2.84.240/2910.2.84.241 – 10.2.84.24610.2.84.247
3210.2.84.248/2910.2.84.249 – 10.2.84.25410.2.84.255
3310.2.85.0/2910.2.85.1 – 10.2.85.610.2.85.7
3410.2.85.8/2910.2.85.9 – 10.2.85.1410.2.85.15
3510.2.85.16/2910.2.85.17 – 10.2.85.2210.2.85.23
3610.2.85.24/2910.2.85.25 – 10.2.85.3010.2.85.31
3710.2.85.32/2910.2.85.33 – 10.2.85.3810.2.85.39
3810.2.85.40/2910.2.85.41 – 10.2.85.4610.2.85.47
3910.2.85.48/2910.2.85.49 – 10.2.85.5410.2.85.55
4010.2.85.56/2910.2.85.57 – 10.2.85.6210.2.85.63
4110.2.85.64/2910.2.85.65 – 10.2.85.7010.2.85.71
4210.2.85.72/2910.2.85.73 – 10.2.85.7810.2.85.79
4310.2.85.80/2910.2.85.81 – 10.2.85.8610.2.85.87
4410.2.85.88/2910.2.85.89 – 10.2.85.9410.2.85.95
4510.2.85.96/2910.2.85.97 – 10.2.85.10210.2.85.103
4610.2.85.104/2910.2.85.105 – 10.2.85.11010.2.85.111
4710.2.85.112/2910.2.85.113 – 10.2.85.11810.2.85.119
4810.2.85.120/2910.2.85.121 – 10.2.85.12610.2.85.127
4910.2.85.128/2910.2.85.129 – 10.2.85.13410.2.85.135
5010.2.85.136/2910.2.85.137 – 10.2.85.14210.2.85.143
5110.2.85.144/2910.2.85.145 – 10.2.85.15010.2.85.151
5210.2.85.152/2910.2.85.153 – 10.2.85.15810.2.85.159
5310.2.85.160/2910.2.85.161 – 10.2.85.16610.2.85.167
5410.2.85.168/2910.2.85.169 – 10.2.85.17410.2.85.175
5510.2.85.176/2910.2.85.177 – 10.2.85.18210.2.85.183
5610.2.85.184/2910.2.85.185 – 10.2.85.19010.2.85.191
5710.2.85.192/2910.2.85.193 – 10.2.85.19810.2.85.199
5810.2.85.200/2910.2.85.201 – 10.2.85.20610.2.85.207
5910.2.85.208/2910.2.85.209 – 10.2.85.21410.2.85.215
6010.2.85.216/2910.2.85.217 – 10.2.85.22210.2.85.223
6110.2.85.224/2910.2.85.225 – 10.2.85.23010.2.85.231
6210.2.85.232/2910.2.85.233 – 10.2.85.23810.2.85.239
6310.2.85.240/2910.2.85.241 – 10.2.85.24610.2.85.247
6410.2.85.248/2910.2.85.249 – 10.2.85.25410.2.85.255
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 →