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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)10.3.154.0/23
network10.3.154.0/23
broadcast10.3.155.255
first host10.3.154.1
last host10.3.155.254
subnet mask255.255.254.0
wildcard0.0.1.255
addresses512
usable hosts510
classA
ipcalc 10.3.154.0/23
address00001010.00000011.10011010.00000000
subnet mask11111111.11111111.11111110.00000000
network00001010.00000011.10011010.00000000
broadcast00001010.00000011.10011011.11111111
green = network part, grey = host part
hex0x0a039a00
decimal168008192
reverse dns0.154.3.10.in-addr.arpa
ipv4-mapped::ffff:a03:9a00

/23 split into /29 · 64 subnets

close ×
#networkhost rangebroadcast
110.3.154.0/2910.3.154.1 – 10.3.154.610.3.154.7
210.3.154.8/2910.3.154.9 – 10.3.154.1410.3.154.15
310.3.154.16/2910.3.154.17 – 10.3.154.2210.3.154.23
410.3.154.24/2910.3.154.25 – 10.3.154.3010.3.154.31
510.3.154.32/2910.3.154.33 – 10.3.154.3810.3.154.39
610.3.154.40/2910.3.154.41 – 10.3.154.4610.3.154.47
710.3.154.48/2910.3.154.49 – 10.3.154.5410.3.154.55
810.3.154.56/2910.3.154.57 – 10.3.154.6210.3.154.63
910.3.154.64/2910.3.154.65 – 10.3.154.7010.3.154.71
1010.3.154.72/2910.3.154.73 – 10.3.154.7810.3.154.79
1110.3.154.80/2910.3.154.81 – 10.3.154.8610.3.154.87
1210.3.154.88/2910.3.154.89 – 10.3.154.9410.3.154.95
1310.3.154.96/2910.3.154.97 – 10.3.154.10210.3.154.103
1410.3.154.104/2910.3.154.105 – 10.3.154.11010.3.154.111
1510.3.154.112/2910.3.154.113 – 10.3.154.11810.3.154.119
1610.3.154.120/2910.3.154.121 – 10.3.154.12610.3.154.127
1710.3.154.128/2910.3.154.129 – 10.3.154.13410.3.154.135
1810.3.154.136/2910.3.154.137 – 10.3.154.14210.3.154.143
1910.3.154.144/2910.3.154.145 – 10.3.154.15010.3.154.151
2010.3.154.152/2910.3.154.153 – 10.3.154.15810.3.154.159
2110.3.154.160/2910.3.154.161 – 10.3.154.16610.3.154.167
2210.3.154.168/2910.3.154.169 – 10.3.154.17410.3.154.175
2310.3.154.176/2910.3.154.177 – 10.3.154.18210.3.154.183
2410.3.154.184/2910.3.154.185 – 10.3.154.19010.3.154.191
2510.3.154.192/2910.3.154.193 – 10.3.154.19810.3.154.199
2610.3.154.200/2910.3.154.201 – 10.3.154.20610.3.154.207
2710.3.154.208/2910.3.154.209 – 10.3.154.21410.3.154.215
2810.3.154.216/2910.3.154.217 – 10.3.154.22210.3.154.223
2910.3.154.224/2910.3.154.225 – 10.3.154.23010.3.154.231
3010.3.154.232/2910.3.154.233 – 10.3.154.23810.3.154.239
3110.3.154.240/2910.3.154.241 – 10.3.154.24610.3.154.247
3210.3.154.248/2910.3.154.249 – 10.3.154.25410.3.154.255
3310.3.155.0/2910.3.155.1 – 10.3.155.610.3.155.7
3410.3.155.8/2910.3.155.9 – 10.3.155.1410.3.155.15
3510.3.155.16/2910.3.155.17 – 10.3.155.2210.3.155.23
3610.3.155.24/2910.3.155.25 – 10.3.155.3010.3.155.31
3710.3.155.32/2910.3.155.33 – 10.3.155.3810.3.155.39
3810.3.155.40/2910.3.155.41 – 10.3.155.4610.3.155.47
3910.3.155.48/2910.3.155.49 – 10.3.155.5410.3.155.55
4010.3.155.56/2910.3.155.57 – 10.3.155.6210.3.155.63
4110.3.155.64/2910.3.155.65 – 10.3.155.7010.3.155.71
4210.3.155.72/2910.3.155.73 – 10.3.155.7810.3.155.79
4310.3.155.80/2910.3.155.81 – 10.3.155.8610.3.155.87
4410.3.155.88/2910.3.155.89 – 10.3.155.9410.3.155.95
4510.3.155.96/2910.3.155.97 – 10.3.155.10210.3.155.103
4610.3.155.104/2910.3.155.105 – 10.3.155.11010.3.155.111
4710.3.155.112/2910.3.155.113 – 10.3.155.11810.3.155.119
4810.3.155.120/2910.3.155.121 – 10.3.155.12610.3.155.127
4910.3.155.128/2910.3.155.129 – 10.3.155.13410.3.155.135
5010.3.155.136/2910.3.155.137 – 10.3.155.14210.3.155.143
5110.3.155.144/2910.3.155.145 – 10.3.155.15010.3.155.151
5210.3.155.152/2910.3.155.153 – 10.3.155.15810.3.155.159
5310.3.155.160/2910.3.155.161 – 10.3.155.16610.3.155.167
5410.3.155.168/2910.3.155.169 – 10.3.155.17410.3.155.175
5510.3.155.176/2910.3.155.177 – 10.3.155.18210.3.155.183
5610.3.155.184/2910.3.155.185 – 10.3.155.19010.3.155.191
5710.3.155.192/2910.3.155.193 – 10.3.155.19810.3.155.199
5810.3.155.200/2910.3.155.201 – 10.3.155.20610.3.155.207
5910.3.155.208/2910.3.155.209 – 10.3.155.21410.3.155.215
6010.3.155.216/2910.3.155.217 – 10.3.155.22210.3.155.223
6110.3.155.224/2910.3.155.225 – 10.3.155.23010.3.155.231
6210.3.155.232/2910.3.155.233 – 10.3.155.23810.3.155.239
6310.3.155.240/2910.3.155.241 – 10.3.155.24610.3.155.247
6410.3.155.248/2910.3.155.249 – 10.3.155.25410.3.155.255
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 →