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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)10.1.134.0/23
network10.1.134.0/23
broadcast10.1.135.255
first host10.1.134.1
last host10.1.135.254
subnet mask255.255.254.0
wildcard0.0.1.255
addresses512
usable hosts510
classA
ipcalc 10.1.134.0/23
address00001010.00000001.10000110.00000000
subnet mask11111111.11111111.11111110.00000000
network00001010.00000001.10000110.00000000
broadcast00001010.00000001.10000111.11111111
green = network part, grey = host part
hex0x0a018600
decimal167872000
reverse dns0.134.1.10.in-addr.arpa
ipv4-mapped::ffff:a01:8600

/23 split into /29 · 64 subnets

close ×
#networkhost rangebroadcast
110.1.134.0/2910.1.134.1 – 10.1.134.610.1.134.7
210.1.134.8/2910.1.134.9 – 10.1.134.1410.1.134.15
310.1.134.16/2910.1.134.17 – 10.1.134.2210.1.134.23
410.1.134.24/2910.1.134.25 – 10.1.134.3010.1.134.31
510.1.134.32/2910.1.134.33 – 10.1.134.3810.1.134.39
610.1.134.40/2910.1.134.41 – 10.1.134.4610.1.134.47
710.1.134.48/2910.1.134.49 – 10.1.134.5410.1.134.55
810.1.134.56/2910.1.134.57 – 10.1.134.6210.1.134.63
910.1.134.64/2910.1.134.65 – 10.1.134.7010.1.134.71
1010.1.134.72/2910.1.134.73 – 10.1.134.7810.1.134.79
1110.1.134.80/2910.1.134.81 – 10.1.134.8610.1.134.87
1210.1.134.88/2910.1.134.89 – 10.1.134.9410.1.134.95
1310.1.134.96/2910.1.134.97 – 10.1.134.10210.1.134.103
1410.1.134.104/2910.1.134.105 – 10.1.134.11010.1.134.111
1510.1.134.112/2910.1.134.113 – 10.1.134.11810.1.134.119
1610.1.134.120/2910.1.134.121 – 10.1.134.12610.1.134.127
1710.1.134.128/2910.1.134.129 – 10.1.134.13410.1.134.135
1810.1.134.136/2910.1.134.137 – 10.1.134.14210.1.134.143
1910.1.134.144/2910.1.134.145 – 10.1.134.15010.1.134.151
2010.1.134.152/2910.1.134.153 – 10.1.134.15810.1.134.159
2110.1.134.160/2910.1.134.161 – 10.1.134.16610.1.134.167
2210.1.134.168/2910.1.134.169 – 10.1.134.17410.1.134.175
2310.1.134.176/2910.1.134.177 – 10.1.134.18210.1.134.183
2410.1.134.184/2910.1.134.185 – 10.1.134.19010.1.134.191
2510.1.134.192/2910.1.134.193 – 10.1.134.19810.1.134.199
2610.1.134.200/2910.1.134.201 – 10.1.134.20610.1.134.207
2710.1.134.208/2910.1.134.209 – 10.1.134.21410.1.134.215
2810.1.134.216/2910.1.134.217 – 10.1.134.22210.1.134.223
2910.1.134.224/2910.1.134.225 – 10.1.134.23010.1.134.231
3010.1.134.232/2910.1.134.233 – 10.1.134.23810.1.134.239
3110.1.134.240/2910.1.134.241 – 10.1.134.24610.1.134.247
3210.1.134.248/2910.1.134.249 – 10.1.134.25410.1.134.255
3310.1.135.0/2910.1.135.1 – 10.1.135.610.1.135.7
3410.1.135.8/2910.1.135.9 – 10.1.135.1410.1.135.15
3510.1.135.16/2910.1.135.17 – 10.1.135.2210.1.135.23
3610.1.135.24/2910.1.135.25 – 10.1.135.3010.1.135.31
3710.1.135.32/2910.1.135.33 – 10.1.135.3810.1.135.39
3810.1.135.40/2910.1.135.41 – 10.1.135.4610.1.135.47
3910.1.135.48/2910.1.135.49 – 10.1.135.5410.1.135.55
4010.1.135.56/2910.1.135.57 – 10.1.135.6210.1.135.63
4110.1.135.64/2910.1.135.65 – 10.1.135.7010.1.135.71
4210.1.135.72/2910.1.135.73 – 10.1.135.7810.1.135.79
4310.1.135.80/2910.1.135.81 – 10.1.135.8610.1.135.87
4410.1.135.88/2910.1.135.89 – 10.1.135.9410.1.135.95
4510.1.135.96/2910.1.135.97 – 10.1.135.10210.1.135.103
4610.1.135.104/2910.1.135.105 – 10.1.135.11010.1.135.111
4710.1.135.112/2910.1.135.113 – 10.1.135.11810.1.135.119
4810.1.135.120/2910.1.135.121 – 10.1.135.12610.1.135.127
4910.1.135.128/2910.1.135.129 – 10.1.135.13410.1.135.135
5010.1.135.136/2910.1.135.137 – 10.1.135.14210.1.135.143
5110.1.135.144/2910.1.135.145 – 10.1.135.15010.1.135.151
5210.1.135.152/2910.1.135.153 – 10.1.135.15810.1.135.159
5310.1.135.160/2910.1.135.161 – 10.1.135.16610.1.135.167
5410.1.135.168/2910.1.135.169 – 10.1.135.17410.1.135.175
5510.1.135.176/2910.1.135.177 – 10.1.135.18210.1.135.183
5610.1.135.184/2910.1.135.185 – 10.1.135.19010.1.135.191
5710.1.135.192/2910.1.135.193 – 10.1.135.19810.1.135.199
5810.1.135.200/2910.1.135.201 – 10.1.135.20610.1.135.207
5910.1.135.208/2910.1.135.209 – 10.1.135.21410.1.135.215
6010.1.135.216/2910.1.135.217 – 10.1.135.22210.1.135.223
6110.1.135.224/2910.1.135.225 – 10.1.135.23010.1.135.231
6210.1.135.232/2910.1.135.233 – 10.1.135.23810.1.135.239
6310.1.135.240/2910.1.135.241 – 10.1.135.24610.1.135.247
6410.1.135.248/2910.1.135.249 – 10.1.135.25410.1.135.255
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 →