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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)10.167.16.128/25
network10.167.16.128/25
broadcast10.167.16.255
first host10.167.16.129
last host10.167.16.254
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classA
ipcalc 10.167.16.128/25
address00001010.10100111.00010000.10000000
subnet mask11111111.11111111.11111111.10000000
network00001010.10100111.00010000.10000000
broadcast00001010.10100111.00010000.11111111
green = network part, grey = host part
hex0x0aa71080
decimal178720896
reverse dns128.16.167.10.in-addr.arpa
ipv4-mapped::ffff:aa7:1080

/25 split into /30 · 32 subnets

close ×
#networkhost rangebroadcast
110.167.16.128/3010.167.16.129 – 10.167.16.13010.167.16.131
210.167.16.132/3010.167.16.133 – 10.167.16.13410.167.16.135
310.167.16.136/3010.167.16.137 – 10.167.16.13810.167.16.139
410.167.16.140/3010.167.16.141 – 10.167.16.14210.167.16.143
510.167.16.144/3010.167.16.145 – 10.167.16.14610.167.16.147
610.167.16.148/3010.167.16.149 – 10.167.16.15010.167.16.151
710.167.16.152/3010.167.16.153 – 10.167.16.15410.167.16.155
810.167.16.156/3010.167.16.157 – 10.167.16.15810.167.16.159
910.167.16.160/3010.167.16.161 – 10.167.16.16210.167.16.163
1010.167.16.164/3010.167.16.165 – 10.167.16.16610.167.16.167
1110.167.16.168/3010.167.16.169 – 10.167.16.17010.167.16.171
1210.167.16.172/3010.167.16.173 – 10.167.16.17410.167.16.175
1310.167.16.176/3010.167.16.177 – 10.167.16.17810.167.16.179
1410.167.16.180/3010.167.16.181 – 10.167.16.18210.167.16.183
1510.167.16.184/3010.167.16.185 – 10.167.16.18610.167.16.187
1610.167.16.188/3010.167.16.189 – 10.167.16.19010.167.16.191
1710.167.16.192/3010.167.16.193 – 10.167.16.19410.167.16.195
1810.167.16.196/3010.167.16.197 – 10.167.16.19810.167.16.199
1910.167.16.200/3010.167.16.201 – 10.167.16.20210.167.16.203
2010.167.16.204/3010.167.16.205 – 10.167.16.20610.167.16.207
2110.167.16.208/3010.167.16.209 – 10.167.16.21010.167.16.211
2210.167.16.212/3010.167.16.213 – 10.167.16.21410.167.16.215
2310.167.16.216/3010.167.16.217 – 10.167.16.21810.167.16.219
2410.167.16.220/3010.167.16.221 – 10.167.16.22210.167.16.223
2510.167.16.224/3010.167.16.225 – 10.167.16.22610.167.16.227
2610.167.16.228/3010.167.16.229 – 10.167.16.23010.167.16.231
2710.167.16.232/3010.167.16.233 – 10.167.16.23410.167.16.235
2810.167.16.236/3010.167.16.237 – 10.167.16.23810.167.16.239
2910.167.16.240/3010.167.16.241 – 10.167.16.24210.167.16.243
3010.167.16.244/3010.167.16.245 – 10.167.16.24610.167.16.247
3110.167.16.248/3010.167.16.249 – 10.167.16.25010.167.16.251
3210.167.16.252/3010.167.16.253 – 10.167.16.25410.167.16.255
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 →