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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)10.167.242.0/23
network10.167.242.0/23
broadcast10.167.243.255
first host10.167.242.1
last host10.167.243.254
subnet mask255.255.254.0
wildcard0.0.1.255
addresses512
usable hosts510
classA
ipcalc 10.167.242.0/23
address00001010.10100111.11110010.00000000
subnet mask11111111.11111111.11111110.00000000
network00001010.10100111.11110010.00000000
broadcast00001010.10100111.11110011.11111111
green = network part, grey = host part
hex0x0aa7f200
decimal178778624
reverse dns0.242.167.10.in-addr.arpa
ipv4-mapped::ffff:aa7:f200

/23 split into /29 · 64 subnets

close ×
#networkhost rangebroadcast
110.167.242.0/2910.167.242.1 – 10.167.242.610.167.242.7
210.167.242.8/2910.167.242.9 – 10.167.242.1410.167.242.15
310.167.242.16/2910.167.242.17 – 10.167.242.2210.167.242.23
410.167.242.24/2910.167.242.25 – 10.167.242.3010.167.242.31
510.167.242.32/2910.167.242.33 – 10.167.242.3810.167.242.39
610.167.242.40/2910.167.242.41 – 10.167.242.4610.167.242.47
710.167.242.48/2910.167.242.49 – 10.167.242.5410.167.242.55
810.167.242.56/2910.167.242.57 – 10.167.242.6210.167.242.63
910.167.242.64/2910.167.242.65 – 10.167.242.7010.167.242.71
1010.167.242.72/2910.167.242.73 – 10.167.242.7810.167.242.79
1110.167.242.80/2910.167.242.81 – 10.167.242.8610.167.242.87
1210.167.242.88/2910.167.242.89 – 10.167.242.9410.167.242.95
1310.167.242.96/2910.167.242.97 – 10.167.242.10210.167.242.103
1410.167.242.104/2910.167.242.105 – 10.167.242.11010.167.242.111
1510.167.242.112/2910.167.242.113 – 10.167.242.11810.167.242.119
1610.167.242.120/2910.167.242.121 – 10.167.242.12610.167.242.127
1710.167.242.128/2910.167.242.129 – 10.167.242.13410.167.242.135
1810.167.242.136/2910.167.242.137 – 10.167.242.14210.167.242.143
1910.167.242.144/2910.167.242.145 – 10.167.242.15010.167.242.151
2010.167.242.152/2910.167.242.153 – 10.167.242.15810.167.242.159
2110.167.242.160/2910.167.242.161 – 10.167.242.16610.167.242.167
2210.167.242.168/2910.167.242.169 – 10.167.242.17410.167.242.175
2310.167.242.176/2910.167.242.177 – 10.167.242.18210.167.242.183
2410.167.242.184/2910.167.242.185 – 10.167.242.19010.167.242.191
2510.167.242.192/2910.167.242.193 – 10.167.242.19810.167.242.199
2610.167.242.200/2910.167.242.201 – 10.167.242.20610.167.242.207
2710.167.242.208/2910.167.242.209 – 10.167.242.21410.167.242.215
2810.167.242.216/2910.167.242.217 – 10.167.242.22210.167.242.223
2910.167.242.224/2910.167.242.225 – 10.167.242.23010.167.242.231
3010.167.242.232/2910.167.242.233 – 10.167.242.23810.167.242.239
3110.167.242.240/2910.167.242.241 – 10.167.242.24610.167.242.247
3210.167.242.248/2910.167.242.249 – 10.167.242.25410.167.242.255
3310.167.243.0/2910.167.243.1 – 10.167.243.610.167.243.7
3410.167.243.8/2910.167.243.9 – 10.167.243.1410.167.243.15
3510.167.243.16/2910.167.243.17 – 10.167.243.2210.167.243.23
3610.167.243.24/2910.167.243.25 – 10.167.243.3010.167.243.31
3710.167.243.32/2910.167.243.33 – 10.167.243.3810.167.243.39
3810.167.243.40/2910.167.243.41 – 10.167.243.4610.167.243.47
3910.167.243.48/2910.167.243.49 – 10.167.243.5410.167.243.55
4010.167.243.56/2910.167.243.57 – 10.167.243.6210.167.243.63
4110.167.243.64/2910.167.243.65 – 10.167.243.7010.167.243.71
4210.167.243.72/2910.167.243.73 – 10.167.243.7810.167.243.79
4310.167.243.80/2910.167.243.81 – 10.167.243.8610.167.243.87
4410.167.243.88/2910.167.243.89 – 10.167.243.9410.167.243.95
4510.167.243.96/2910.167.243.97 – 10.167.243.10210.167.243.103
4610.167.243.104/2910.167.243.105 – 10.167.243.11010.167.243.111
4710.167.243.112/2910.167.243.113 – 10.167.243.11810.167.243.119
4810.167.243.120/2910.167.243.121 – 10.167.243.12610.167.243.127
4910.167.243.128/2910.167.243.129 – 10.167.243.13410.167.243.135
5010.167.243.136/2910.167.243.137 – 10.167.243.14210.167.243.143
5110.167.243.144/2910.167.243.145 – 10.167.243.15010.167.243.151
5210.167.243.152/2910.167.243.153 – 10.167.243.15810.167.243.159
5310.167.243.160/2910.167.243.161 – 10.167.243.16610.167.243.167
5410.167.243.168/2910.167.243.169 – 10.167.243.17410.167.243.175
5510.167.243.176/2910.167.243.177 – 10.167.243.18210.167.243.183
5610.167.243.184/2910.167.243.185 – 10.167.243.19010.167.243.191
5710.167.243.192/2910.167.243.193 – 10.167.243.19810.167.243.199
5810.167.243.200/2910.167.243.201 – 10.167.243.20610.167.243.207
5910.167.243.208/2910.167.243.209 – 10.167.243.21410.167.243.215
6010.167.243.216/2910.167.243.217 – 10.167.243.22210.167.243.223
6110.167.243.224/2910.167.243.225 – 10.167.243.23010.167.243.231
6210.167.243.232/2910.167.243.233 – 10.167.243.23810.167.243.239
6310.167.243.240/2910.167.243.241 – 10.167.243.24610.167.243.247
6410.167.243.248/2910.167.243.249 – 10.167.243.25410.167.243.255
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 →