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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)10.167.138.0/23
network10.167.138.0/23
broadcast10.167.139.255
first host10.167.138.1
last host10.167.139.254
subnet mask255.255.254.0
wildcard0.0.1.255
addresses512
usable hosts510
classA
ipcalc 10.167.138.0/23
address00001010.10100111.10001010.00000000
subnet mask11111111.11111111.11111110.00000000
network00001010.10100111.10001010.00000000
broadcast00001010.10100111.10001011.11111111
green = network part, grey = host part
hex0x0aa78a00
decimal178752000
reverse dns0.138.167.10.in-addr.arpa
ipv4-mapped::ffff:aa7:8a00

/23 split into /29 · 64 subnets

close ×
#networkhost rangebroadcast
110.167.138.0/2910.167.138.1 – 10.167.138.610.167.138.7
210.167.138.8/2910.167.138.9 – 10.167.138.1410.167.138.15
310.167.138.16/2910.167.138.17 – 10.167.138.2210.167.138.23
410.167.138.24/2910.167.138.25 – 10.167.138.3010.167.138.31
510.167.138.32/2910.167.138.33 – 10.167.138.3810.167.138.39
610.167.138.40/2910.167.138.41 – 10.167.138.4610.167.138.47
710.167.138.48/2910.167.138.49 – 10.167.138.5410.167.138.55
810.167.138.56/2910.167.138.57 – 10.167.138.6210.167.138.63
910.167.138.64/2910.167.138.65 – 10.167.138.7010.167.138.71
1010.167.138.72/2910.167.138.73 – 10.167.138.7810.167.138.79
1110.167.138.80/2910.167.138.81 – 10.167.138.8610.167.138.87
1210.167.138.88/2910.167.138.89 – 10.167.138.9410.167.138.95
1310.167.138.96/2910.167.138.97 – 10.167.138.10210.167.138.103
1410.167.138.104/2910.167.138.105 – 10.167.138.11010.167.138.111
1510.167.138.112/2910.167.138.113 – 10.167.138.11810.167.138.119
1610.167.138.120/2910.167.138.121 – 10.167.138.12610.167.138.127
1710.167.138.128/2910.167.138.129 – 10.167.138.13410.167.138.135
1810.167.138.136/2910.167.138.137 – 10.167.138.14210.167.138.143
1910.167.138.144/2910.167.138.145 – 10.167.138.15010.167.138.151
2010.167.138.152/2910.167.138.153 – 10.167.138.15810.167.138.159
2110.167.138.160/2910.167.138.161 – 10.167.138.16610.167.138.167
2210.167.138.168/2910.167.138.169 – 10.167.138.17410.167.138.175
2310.167.138.176/2910.167.138.177 – 10.167.138.18210.167.138.183
2410.167.138.184/2910.167.138.185 – 10.167.138.19010.167.138.191
2510.167.138.192/2910.167.138.193 – 10.167.138.19810.167.138.199
2610.167.138.200/2910.167.138.201 – 10.167.138.20610.167.138.207
2710.167.138.208/2910.167.138.209 – 10.167.138.21410.167.138.215
2810.167.138.216/2910.167.138.217 – 10.167.138.22210.167.138.223
2910.167.138.224/2910.167.138.225 – 10.167.138.23010.167.138.231
3010.167.138.232/2910.167.138.233 – 10.167.138.23810.167.138.239
3110.167.138.240/2910.167.138.241 – 10.167.138.24610.167.138.247
3210.167.138.248/2910.167.138.249 – 10.167.138.25410.167.138.255
3310.167.139.0/2910.167.139.1 – 10.167.139.610.167.139.7
3410.167.139.8/2910.167.139.9 – 10.167.139.1410.167.139.15
3510.167.139.16/2910.167.139.17 – 10.167.139.2210.167.139.23
3610.167.139.24/2910.167.139.25 – 10.167.139.3010.167.139.31
3710.167.139.32/2910.167.139.33 – 10.167.139.3810.167.139.39
3810.167.139.40/2910.167.139.41 – 10.167.139.4610.167.139.47
3910.167.139.48/2910.167.139.49 – 10.167.139.5410.167.139.55
4010.167.139.56/2910.167.139.57 – 10.167.139.6210.167.139.63
4110.167.139.64/2910.167.139.65 – 10.167.139.7010.167.139.71
4210.167.139.72/2910.167.139.73 – 10.167.139.7810.167.139.79
4310.167.139.80/2910.167.139.81 – 10.167.139.8610.167.139.87
4410.167.139.88/2910.167.139.89 – 10.167.139.9410.167.139.95
4510.167.139.96/2910.167.139.97 – 10.167.139.10210.167.139.103
4610.167.139.104/2910.167.139.105 – 10.167.139.11010.167.139.111
4710.167.139.112/2910.167.139.113 – 10.167.139.11810.167.139.119
4810.167.139.120/2910.167.139.121 – 10.167.139.12610.167.139.127
4910.167.139.128/2910.167.139.129 – 10.167.139.13410.167.139.135
5010.167.139.136/2910.167.139.137 – 10.167.139.14210.167.139.143
5110.167.139.144/2910.167.139.145 – 10.167.139.15010.167.139.151
5210.167.139.152/2910.167.139.153 – 10.167.139.15810.167.139.159
5310.167.139.160/2910.167.139.161 – 10.167.139.16610.167.139.167
5410.167.139.168/2910.167.139.169 – 10.167.139.17410.167.139.175
5510.167.139.176/2910.167.139.177 – 10.167.139.18210.167.139.183
5610.167.139.184/2910.167.139.185 – 10.167.139.19010.167.139.191
5710.167.139.192/2910.167.139.193 – 10.167.139.19810.167.139.199
5810.167.139.200/2910.167.139.201 – 10.167.139.20610.167.139.207
5910.167.139.208/2910.167.139.209 – 10.167.139.21410.167.139.215
6010.167.139.216/2910.167.139.217 – 10.167.139.22210.167.139.223
6110.167.139.224/2910.167.139.225 – 10.167.139.23010.167.139.231
6210.167.139.232/2910.167.139.233 – 10.167.139.23810.167.139.239
6310.167.139.240/2910.167.139.241 – 10.167.139.24610.167.139.247
6410.167.139.248/2910.167.139.249 – 10.167.139.25410.167.139.255
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 →