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)10.26.78.128/25
network10.26.78.128/25
broadcast10.26.78.255
first host10.26.78.129
last host10.26.78.254
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classA
ipcalc 10.26.78.128/25
address00001010.00011010.01001110.10000000
subnet mask11111111.11111111.11111111.10000000
network00001010.00011010.01001110.10000000
broadcast00001010.00011010.01001110.11111111
green = network part, grey = host part
hex0x0a1a4e80
decimal169496192
reverse dns128.78.26.10.in-addr.arpa
ipv4-mapped::ffff:a1a:4e80

/25 split into /30 · 32 subnets

close ×
#networkhost rangebroadcast
110.26.78.128/3010.26.78.129 – 10.26.78.13010.26.78.131
210.26.78.132/3010.26.78.133 – 10.26.78.13410.26.78.135
310.26.78.136/3010.26.78.137 – 10.26.78.13810.26.78.139
410.26.78.140/3010.26.78.141 – 10.26.78.14210.26.78.143
510.26.78.144/3010.26.78.145 – 10.26.78.14610.26.78.147
610.26.78.148/3010.26.78.149 – 10.26.78.15010.26.78.151
710.26.78.152/3010.26.78.153 – 10.26.78.15410.26.78.155
810.26.78.156/3010.26.78.157 – 10.26.78.15810.26.78.159
910.26.78.160/3010.26.78.161 – 10.26.78.16210.26.78.163
1010.26.78.164/3010.26.78.165 – 10.26.78.16610.26.78.167
1110.26.78.168/3010.26.78.169 – 10.26.78.17010.26.78.171
1210.26.78.172/3010.26.78.173 – 10.26.78.17410.26.78.175
1310.26.78.176/3010.26.78.177 – 10.26.78.17810.26.78.179
1410.26.78.180/3010.26.78.181 – 10.26.78.18210.26.78.183
1510.26.78.184/3010.26.78.185 – 10.26.78.18610.26.78.187
1610.26.78.188/3010.26.78.189 – 10.26.78.19010.26.78.191
1710.26.78.192/3010.26.78.193 – 10.26.78.19410.26.78.195
1810.26.78.196/3010.26.78.197 – 10.26.78.19810.26.78.199
1910.26.78.200/3010.26.78.201 – 10.26.78.20210.26.78.203
2010.26.78.204/3010.26.78.205 – 10.26.78.20610.26.78.207
2110.26.78.208/3010.26.78.209 – 10.26.78.21010.26.78.211
2210.26.78.212/3010.26.78.213 – 10.26.78.21410.26.78.215
2310.26.78.216/3010.26.78.217 – 10.26.78.21810.26.78.219
2410.26.78.220/3010.26.78.221 – 10.26.78.22210.26.78.223
2510.26.78.224/3010.26.78.225 – 10.26.78.22610.26.78.227
2610.26.78.228/3010.26.78.229 – 10.26.78.23010.26.78.231
2710.26.78.232/3010.26.78.233 – 10.26.78.23410.26.78.235
2810.26.78.236/3010.26.78.237 – 10.26.78.23810.26.78.239
2910.26.78.240/3010.26.78.241 – 10.26.78.24210.26.78.243
3010.26.78.244/3010.26.78.245 – 10.26.78.24610.26.78.247
3110.26.78.248/3010.26.78.249 – 10.26.78.25010.26.78.251
3210.26.78.252/3010.26.78.253 – 10.26.78.25410.26.78.255
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 →