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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)10.4.151.192/26
network10.4.151.192/26
broadcast10.4.151.255
first host10.4.151.193
last host10.4.151.254
subnet mask255.255.255.192
wildcard0.0.0.63
addresses64
usable hosts62
classA
ipcalc 10.4.151.192/26
address00001010.00000100.10010111.11000000
subnet mask11111111.11111111.11111111.11000000
network00001010.00000100.10010111.11000000
broadcast00001010.00000100.10010111.11111111
green = network part, grey = host part
hex0x0a0497c0
decimal168073152
reverse dns192.151.4.10.in-addr.arpa
ipv4-mapped::ffff:a04:97c0

/26 split into /30 · 16 subnets

close ×
#networkhost rangebroadcast
110.4.151.192/3010.4.151.193 – 10.4.151.19410.4.151.195
210.4.151.196/3010.4.151.197 – 10.4.151.19810.4.151.199
310.4.151.200/3010.4.151.201 – 10.4.151.20210.4.151.203
410.4.151.204/3010.4.151.205 – 10.4.151.20610.4.151.207
510.4.151.208/3010.4.151.209 – 10.4.151.21010.4.151.211
610.4.151.212/3010.4.151.213 – 10.4.151.21410.4.151.215
710.4.151.216/3010.4.151.217 – 10.4.151.21810.4.151.219
810.4.151.220/3010.4.151.221 – 10.4.151.22210.4.151.223
910.4.151.224/3010.4.151.225 – 10.4.151.22610.4.151.227
1010.4.151.228/3010.4.151.229 – 10.4.151.23010.4.151.231
1110.4.151.232/3010.4.151.233 – 10.4.151.23410.4.151.235
1210.4.151.236/3010.4.151.237 – 10.4.151.23810.4.151.239
1310.4.151.240/3010.4.151.241 – 10.4.151.24210.4.151.243
1410.4.151.244/3010.4.151.245 – 10.4.151.24610.4.151.247
1510.4.151.248/3010.4.151.249 – 10.4.151.25010.4.151.251
1610.4.151.252/3010.4.151.253 – 10.4.151.25410.4.151.255
01 / table

IPv4 CIDR prefix table.

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

prefixsubnet maskaddresseshostsin your /26
/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-
/24255.255.255.0256254-
/25255.255.255.128128126-
/26255.255.255.19264621
/27255.255.255.22432302 split →
/28255.255.255.24016144 split →
/29255.255.255.248868 split →
/30255.255.255.2524216 split →
/31255.255.255.2542232 split →
/32255.255.255.2551164 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 →