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)10.78.77.128/25
network10.78.77.128/25
broadcast10.78.77.255
first host10.78.77.129
last host10.78.77.254
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classA
ipcalc 10.78.77.128/25
address00001010.01001110.01001101.10000000
subnet mask11111111.11111111.11111111.10000000
network00001010.01001110.01001101.10000000
broadcast00001010.01001110.01001101.11111111
green = network part, grey = host part
hex0x0a4e4d80
decimal172903808
reverse dns128.77.78.10.in-addr.arpa
ipv4-mapped::ffff:a4e:4d80

/25 split into /30 · 32 subnets

close ×
#networkhost rangebroadcast
110.78.77.128/3010.78.77.129 – 10.78.77.13010.78.77.131
210.78.77.132/3010.78.77.133 – 10.78.77.13410.78.77.135
310.78.77.136/3010.78.77.137 – 10.78.77.13810.78.77.139
410.78.77.140/3010.78.77.141 – 10.78.77.14210.78.77.143
510.78.77.144/3010.78.77.145 – 10.78.77.14610.78.77.147
610.78.77.148/3010.78.77.149 – 10.78.77.15010.78.77.151
710.78.77.152/3010.78.77.153 – 10.78.77.15410.78.77.155
810.78.77.156/3010.78.77.157 – 10.78.77.15810.78.77.159
910.78.77.160/3010.78.77.161 – 10.78.77.16210.78.77.163
1010.78.77.164/3010.78.77.165 – 10.78.77.16610.78.77.167
1110.78.77.168/3010.78.77.169 – 10.78.77.17010.78.77.171
1210.78.77.172/3010.78.77.173 – 10.78.77.17410.78.77.175
1310.78.77.176/3010.78.77.177 – 10.78.77.17810.78.77.179
1410.78.77.180/3010.78.77.181 – 10.78.77.18210.78.77.183
1510.78.77.184/3010.78.77.185 – 10.78.77.18610.78.77.187
1610.78.77.188/3010.78.77.189 – 10.78.77.19010.78.77.191
1710.78.77.192/3010.78.77.193 – 10.78.77.19410.78.77.195
1810.78.77.196/3010.78.77.197 – 10.78.77.19810.78.77.199
1910.78.77.200/3010.78.77.201 – 10.78.77.20210.78.77.203
2010.78.77.204/3010.78.77.205 – 10.78.77.20610.78.77.207
2110.78.77.208/3010.78.77.209 – 10.78.77.21010.78.77.211
2210.78.77.212/3010.78.77.213 – 10.78.77.21410.78.77.215
2310.78.77.216/3010.78.77.217 – 10.78.77.21810.78.77.219
2410.78.77.220/3010.78.77.221 – 10.78.77.22210.78.77.223
2510.78.77.224/3010.78.77.225 – 10.78.77.22610.78.77.227
2610.78.77.228/3010.78.77.229 – 10.78.77.23010.78.77.231
2710.78.77.232/3010.78.77.233 – 10.78.77.23410.78.77.235
2810.78.77.236/3010.78.77.237 – 10.78.77.23810.78.77.239
2910.78.77.240/3010.78.77.241 – 10.78.77.24210.78.77.243
3010.78.77.244/3010.78.77.245 – 10.78.77.24610.78.77.247
3110.78.77.248/3010.78.77.249 – 10.78.77.25010.78.77.251
3210.78.77.252/3010.78.77.253 – 10.78.77.25410.78.77.255
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 →