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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)10.167.31.128/25
network10.167.31.128/25
broadcast10.167.31.255
first host10.167.31.129
last host10.167.31.254
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classA
ipcalc 10.167.31.128/25
address00001010.10100111.00011111.10000000
subnet mask11111111.11111111.11111111.10000000
network00001010.10100111.00011111.10000000
broadcast00001010.10100111.00011111.11111111
green = network part, grey = host part
hex0x0aa71f80
decimal178724736
reverse dns128.31.167.10.in-addr.arpa
ipv4-mapped::ffff:aa7:1f80

/25 split into /30 · 32 subnets

close ×
#networkhost rangebroadcast
110.167.31.128/3010.167.31.129 – 10.167.31.13010.167.31.131
210.167.31.132/3010.167.31.133 – 10.167.31.13410.167.31.135
310.167.31.136/3010.167.31.137 – 10.167.31.13810.167.31.139
410.167.31.140/3010.167.31.141 – 10.167.31.14210.167.31.143
510.167.31.144/3010.167.31.145 – 10.167.31.14610.167.31.147
610.167.31.148/3010.167.31.149 – 10.167.31.15010.167.31.151
710.167.31.152/3010.167.31.153 – 10.167.31.15410.167.31.155
810.167.31.156/3010.167.31.157 – 10.167.31.15810.167.31.159
910.167.31.160/3010.167.31.161 – 10.167.31.16210.167.31.163
1010.167.31.164/3010.167.31.165 – 10.167.31.16610.167.31.167
1110.167.31.168/3010.167.31.169 – 10.167.31.17010.167.31.171
1210.167.31.172/3010.167.31.173 – 10.167.31.17410.167.31.175
1310.167.31.176/3010.167.31.177 – 10.167.31.17810.167.31.179
1410.167.31.180/3010.167.31.181 – 10.167.31.18210.167.31.183
1510.167.31.184/3010.167.31.185 – 10.167.31.18610.167.31.187
1610.167.31.188/3010.167.31.189 – 10.167.31.19010.167.31.191
1710.167.31.192/3010.167.31.193 – 10.167.31.19410.167.31.195
1810.167.31.196/3010.167.31.197 – 10.167.31.19810.167.31.199
1910.167.31.200/3010.167.31.201 – 10.167.31.20210.167.31.203
2010.167.31.204/3010.167.31.205 – 10.167.31.20610.167.31.207
2110.167.31.208/3010.167.31.209 – 10.167.31.21010.167.31.211
2210.167.31.212/3010.167.31.213 – 10.167.31.21410.167.31.215
2310.167.31.216/3010.167.31.217 – 10.167.31.21810.167.31.219
2410.167.31.220/3010.167.31.221 – 10.167.31.22210.167.31.223
2510.167.31.224/3010.167.31.225 – 10.167.31.22610.167.31.227
2610.167.31.228/3010.167.31.229 – 10.167.31.23010.167.31.231
2710.167.31.232/3010.167.31.233 – 10.167.31.23410.167.31.235
2810.167.31.236/3010.167.31.237 – 10.167.31.23810.167.31.239
2910.167.31.240/3010.167.31.241 – 10.167.31.24210.167.31.243
3010.167.31.244/3010.167.31.245 – 10.167.31.24610.167.31.247
3110.167.31.248/3010.167.31.249 – 10.167.31.25010.167.31.251
3210.167.31.252/3010.167.31.253 – 10.167.31.25410.167.31.255
01 / table

IPv4 CIDR prefix table.

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

prefixsubnet maskaddresseshostsin your /25
/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-
/25255.255.255.1281281261
/26255.255.255.19264622 split →
/27255.255.255.22432304 split →
/28255.255.255.24016148 split →
/29255.255.255.2488616 split →
/30255.255.255.2524232 split →
/31255.255.255.2542264 split →
/32255.255.255.25511128 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 →