ip
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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)10.87.149.0/24
network10.87.149.0/24
broadcast10.87.149.255
first host10.87.149.1
last host10.87.149.254
subnet mask255.255.255.0
wildcard0.0.0.255
addresses256
usable hosts254
classA
ipcalc 10.87.149.0/24
address00001010.01010111.10010101.00000000
subnet mask11111111.11111111.11111111.00000000
network00001010.01010111.10010101.00000000
broadcast00001010.01010111.10010101.11111111
green = network part, grey = host part
hex0x0a579500
decimal173511936
reverse dns0.149.87.10.in-addr.arpa
ipv4-mapped::ffff:a57:9500

/24 split into /29 · 32 subnets

close ×
#networkhost rangebroadcast
110.87.149.0/2910.87.149.1 – 10.87.149.610.87.149.7
210.87.149.8/2910.87.149.9 – 10.87.149.1410.87.149.15
310.87.149.16/2910.87.149.17 – 10.87.149.2210.87.149.23
410.87.149.24/2910.87.149.25 – 10.87.149.3010.87.149.31
510.87.149.32/2910.87.149.33 – 10.87.149.3810.87.149.39
610.87.149.40/2910.87.149.41 – 10.87.149.4610.87.149.47
710.87.149.48/2910.87.149.49 – 10.87.149.5410.87.149.55
810.87.149.56/2910.87.149.57 – 10.87.149.6210.87.149.63
910.87.149.64/2910.87.149.65 – 10.87.149.7010.87.149.71
1010.87.149.72/2910.87.149.73 – 10.87.149.7810.87.149.79
1110.87.149.80/2910.87.149.81 – 10.87.149.8610.87.149.87
1210.87.149.88/2910.87.149.89 – 10.87.149.9410.87.149.95
1310.87.149.96/2910.87.149.97 – 10.87.149.10210.87.149.103
1410.87.149.104/2910.87.149.105 – 10.87.149.11010.87.149.111
1510.87.149.112/2910.87.149.113 – 10.87.149.11810.87.149.119
1610.87.149.120/2910.87.149.121 – 10.87.149.12610.87.149.127
1710.87.149.128/2910.87.149.129 – 10.87.149.13410.87.149.135
1810.87.149.136/2910.87.149.137 – 10.87.149.14210.87.149.143
1910.87.149.144/2910.87.149.145 – 10.87.149.15010.87.149.151
2010.87.149.152/2910.87.149.153 – 10.87.149.15810.87.149.159
2110.87.149.160/2910.87.149.161 – 10.87.149.16610.87.149.167
2210.87.149.168/2910.87.149.169 – 10.87.149.17410.87.149.175
2310.87.149.176/2910.87.149.177 – 10.87.149.18210.87.149.183
2410.87.149.184/2910.87.149.185 – 10.87.149.19010.87.149.191
2510.87.149.192/2910.87.149.193 – 10.87.149.19810.87.149.199
2610.87.149.200/2910.87.149.201 – 10.87.149.20610.87.149.207
2710.87.149.208/2910.87.149.209 – 10.87.149.21410.87.149.215
2810.87.149.216/2910.87.149.217 – 10.87.149.22210.87.149.223
2910.87.149.224/2910.87.149.225 – 10.87.149.23010.87.149.231
3010.87.149.232/2910.87.149.233 – 10.87.149.23810.87.149.239
3110.87.149.240/2910.87.149.241 – 10.87.149.24610.87.149.247
3210.87.149.248/2910.87.149.249 – 10.87.149.25410.87.149.255
01 / table

IPv4 CIDR prefix table.

Click a prefix longer than your network to split it into subnets.

prefixsubnet maskaddresseshostsin your /24
/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-
/23255.255.254.0512510-
/24255.255.255.02562541
/25255.255.255.1281281262 split →
/26255.255.255.19264624 split →
/27255.255.255.22432308 split →
/28255.255.255.240161416 split →
/29255.255.255.2488632 split →
/30255.255.255.2524264 split →
/31255.255.255.25422128 split →
/32255.255.255.25511256 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 →