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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)10.4.202.0/23
network10.4.202.0/23
broadcast10.4.203.255
first host10.4.202.1
last host10.4.203.254
subnet mask255.255.254.0
wildcard0.0.1.255
addresses512
usable hosts510
classA
ipcalc 10.4.202.0/23
address00001010.00000100.11001010.00000000
subnet mask11111111.11111111.11111110.00000000
network00001010.00000100.11001010.00000000
broadcast00001010.00000100.11001011.11111111
green = network part, grey = host part
hex0x0a04ca00
decimal168086016
reverse dns0.202.4.10.in-addr.arpa
ipv4-mapped::ffff:a04:ca00

/23 split into /29 · 64 subnets

close ×
#networkhost rangebroadcast
110.4.202.0/2910.4.202.1 – 10.4.202.610.4.202.7
210.4.202.8/2910.4.202.9 – 10.4.202.1410.4.202.15
310.4.202.16/2910.4.202.17 – 10.4.202.2210.4.202.23
410.4.202.24/2910.4.202.25 – 10.4.202.3010.4.202.31
510.4.202.32/2910.4.202.33 – 10.4.202.3810.4.202.39
610.4.202.40/2910.4.202.41 – 10.4.202.4610.4.202.47
710.4.202.48/2910.4.202.49 – 10.4.202.5410.4.202.55
810.4.202.56/2910.4.202.57 – 10.4.202.6210.4.202.63
910.4.202.64/2910.4.202.65 – 10.4.202.7010.4.202.71
1010.4.202.72/2910.4.202.73 – 10.4.202.7810.4.202.79
1110.4.202.80/2910.4.202.81 – 10.4.202.8610.4.202.87
1210.4.202.88/2910.4.202.89 – 10.4.202.9410.4.202.95
1310.4.202.96/2910.4.202.97 – 10.4.202.10210.4.202.103
1410.4.202.104/2910.4.202.105 – 10.4.202.11010.4.202.111
1510.4.202.112/2910.4.202.113 – 10.4.202.11810.4.202.119
1610.4.202.120/2910.4.202.121 – 10.4.202.12610.4.202.127
1710.4.202.128/2910.4.202.129 – 10.4.202.13410.4.202.135
1810.4.202.136/2910.4.202.137 – 10.4.202.14210.4.202.143
1910.4.202.144/2910.4.202.145 – 10.4.202.15010.4.202.151
2010.4.202.152/2910.4.202.153 – 10.4.202.15810.4.202.159
2110.4.202.160/2910.4.202.161 – 10.4.202.16610.4.202.167
2210.4.202.168/2910.4.202.169 – 10.4.202.17410.4.202.175
2310.4.202.176/2910.4.202.177 – 10.4.202.18210.4.202.183
2410.4.202.184/2910.4.202.185 – 10.4.202.19010.4.202.191
2510.4.202.192/2910.4.202.193 – 10.4.202.19810.4.202.199
2610.4.202.200/2910.4.202.201 – 10.4.202.20610.4.202.207
2710.4.202.208/2910.4.202.209 – 10.4.202.21410.4.202.215
2810.4.202.216/2910.4.202.217 – 10.4.202.22210.4.202.223
2910.4.202.224/2910.4.202.225 – 10.4.202.23010.4.202.231
3010.4.202.232/2910.4.202.233 – 10.4.202.23810.4.202.239
3110.4.202.240/2910.4.202.241 – 10.4.202.24610.4.202.247
3210.4.202.248/2910.4.202.249 – 10.4.202.25410.4.202.255
3310.4.203.0/2910.4.203.1 – 10.4.203.610.4.203.7
3410.4.203.8/2910.4.203.9 – 10.4.203.1410.4.203.15
3510.4.203.16/2910.4.203.17 – 10.4.203.2210.4.203.23
3610.4.203.24/2910.4.203.25 – 10.4.203.3010.4.203.31
3710.4.203.32/2910.4.203.33 – 10.4.203.3810.4.203.39
3810.4.203.40/2910.4.203.41 – 10.4.203.4610.4.203.47
3910.4.203.48/2910.4.203.49 – 10.4.203.5410.4.203.55
4010.4.203.56/2910.4.203.57 – 10.4.203.6210.4.203.63
4110.4.203.64/2910.4.203.65 – 10.4.203.7010.4.203.71
4210.4.203.72/2910.4.203.73 – 10.4.203.7810.4.203.79
4310.4.203.80/2910.4.203.81 – 10.4.203.8610.4.203.87
4410.4.203.88/2910.4.203.89 – 10.4.203.9410.4.203.95
4510.4.203.96/2910.4.203.97 – 10.4.203.10210.4.203.103
4610.4.203.104/2910.4.203.105 – 10.4.203.11010.4.203.111
4710.4.203.112/2910.4.203.113 – 10.4.203.11810.4.203.119
4810.4.203.120/2910.4.203.121 – 10.4.203.12610.4.203.127
4910.4.203.128/2910.4.203.129 – 10.4.203.13410.4.203.135
5010.4.203.136/2910.4.203.137 – 10.4.203.14210.4.203.143
5110.4.203.144/2910.4.203.145 – 10.4.203.15010.4.203.151
5210.4.203.152/2910.4.203.153 – 10.4.203.15810.4.203.159
5310.4.203.160/2910.4.203.161 – 10.4.203.16610.4.203.167
5410.4.203.168/2910.4.203.169 – 10.4.203.17410.4.203.175
5510.4.203.176/2910.4.203.177 – 10.4.203.18210.4.203.183
5610.4.203.184/2910.4.203.185 – 10.4.203.19010.4.203.191
5710.4.203.192/2910.4.203.193 – 10.4.203.19810.4.203.199
5810.4.203.200/2910.4.203.201 – 10.4.203.20610.4.203.207
5910.4.203.208/2910.4.203.209 – 10.4.203.21410.4.203.215
6010.4.203.216/2910.4.203.217 – 10.4.203.22210.4.203.223
6110.4.203.224/2910.4.203.225 – 10.4.203.23010.4.203.231
6210.4.203.232/2910.4.203.233 – 10.4.203.23810.4.203.239
6310.4.203.240/2910.4.203.241 – 10.4.203.24610.4.203.247
6410.4.203.248/2910.4.203.249 – 10.4.203.25410.4.203.255
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 →