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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)10.30.77.0/24
network10.30.77.0/24
broadcast10.30.77.255
first host10.30.77.1
last host10.30.77.254
subnet mask255.255.255.0
wildcard0.0.0.255
addresses256
usable hosts254
classA
ipcalc 10.30.77.0/24
address00001010.00011110.01001101.00000000
subnet mask11111111.11111111.11111111.00000000
network00001010.00011110.01001101.00000000
broadcast00001010.00011110.01001101.11111111
green = network part, grey = host part
hex0x0a1e4d00
decimal169757952
reverse dns0.77.30.10.in-addr.arpa
ipv4-mapped::ffff:a1e:4d00

/24 split into /30 · 64 subnets

close ×
#networkhost rangebroadcast
110.30.77.0/3010.30.77.1 – 10.30.77.210.30.77.3
210.30.77.4/3010.30.77.5 – 10.30.77.610.30.77.7
310.30.77.8/3010.30.77.9 – 10.30.77.1010.30.77.11
410.30.77.12/3010.30.77.13 – 10.30.77.1410.30.77.15
510.30.77.16/3010.30.77.17 – 10.30.77.1810.30.77.19
610.30.77.20/3010.30.77.21 – 10.30.77.2210.30.77.23
710.30.77.24/3010.30.77.25 – 10.30.77.2610.30.77.27
810.30.77.28/3010.30.77.29 – 10.30.77.3010.30.77.31
910.30.77.32/3010.30.77.33 – 10.30.77.3410.30.77.35
1010.30.77.36/3010.30.77.37 – 10.30.77.3810.30.77.39
1110.30.77.40/3010.30.77.41 – 10.30.77.4210.30.77.43
1210.30.77.44/3010.30.77.45 – 10.30.77.4610.30.77.47
1310.30.77.48/3010.30.77.49 – 10.30.77.5010.30.77.51
1410.30.77.52/3010.30.77.53 – 10.30.77.5410.30.77.55
1510.30.77.56/3010.30.77.57 – 10.30.77.5810.30.77.59
1610.30.77.60/3010.30.77.61 – 10.30.77.6210.30.77.63
1710.30.77.64/3010.30.77.65 – 10.30.77.6610.30.77.67
1810.30.77.68/3010.30.77.69 – 10.30.77.7010.30.77.71
1910.30.77.72/3010.30.77.73 – 10.30.77.7410.30.77.75
2010.30.77.76/3010.30.77.77 – 10.30.77.7810.30.77.79
2110.30.77.80/3010.30.77.81 – 10.30.77.8210.30.77.83
2210.30.77.84/3010.30.77.85 – 10.30.77.8610.30.77.87
2310.30.77.88/3010.30.77.89 – 10.30.77.9010.30.77.91
2410.30.77.92/3010.30.77.93 – 10.30.77.9410.30.77.95
2510.30.77.96/3010.30.77.97 – 10.30.77.9810.30.77.99
2610.30.77.100/3010.30.77.101 – 10.30.77.10210.30.77.103
2710.30.77.104/3010.30.77.105 – 10.30.77.10610.30.77.107
2810.30.77.108/3010.30.77.109 – 10.30.77.11010.30.77.111
2910.30.77.112/3010.30.77.113 – 10.30.77.11410.30.77.115
3010.30.77.116/3010.30.77.117 – 10.30.77.11810.30.77.119
3110.30.77.120/3010.30.77.121 – 10.30.77.12210.30.77.123
3210.30.77.124/3010.30.77.125 – 10.30.77.12610.30.77.127
3310.30.77.128/3010.30.77.129 – 10.30.77.13010.30.77.131
3410.30.77.132/3010.30.77.133 – 10.30.77.13410.30.77.135
3510.30.77.136/3010.30.77.137 – 10.30.77.13810.30.77.139
3610.30.77.140/3010.30.77.141 – 10.30.77.14210.30.77.143
3710.30.77.144/3010.30.77.145 – 10.30.77.14610.30.77.147
3810.30.77.148/3010.30.77.149 – 10.30.77.15010.30.77.151
3910.30.77.152/3010.30.77.153 – 10.30.77.15410.30.77.155
4010.30.77.156/3010.30.77.157 – 10.30.77.15810.30.77.159
4110.30.77.160/3010.30.77.161 – 10.30.77.16210.30.77.163
4210.30.77.164/3010.30.77.165 – 10.30.77.16610.30.77.167
4310.30.77.168/3010.30.77.169 – 10.30.77.17010.30.77.171
4410.30.77.172/3010.30.77.173 – 10.30.77.17410.30.77.175
4510.30.77.176/3010.30.77.177 – 10.30.77.17810.30.77.179
4610.30.77.180/3010.30.77.181 – 10.30.77.18210.30.77.183
4710.30.77.184/3010.30.77.185 – 10.30.77.18610.30.77.187
4810.30.77.188/3010.30.77.189 – 10.30.77.19010.30.77.191
4910.30.77.192/3010.30.77.193 – 10.30.77.19410.30.77.195
5010.30.77.196/3010.30.77.197 – 10.30.77.19810.30.77.199
5110.30.77.200/3010.30.77.201 – 10.30.77.20210.30.77.203
5210.30.77.204/3010.30.77.205 – 10.30.77.20610.30.77.207
5310.30.77.208/3010.30.77.209 – 10.30.77.21010.30.77.211
5410.30.77.212/3010.30.77.213 – 10.30.77.21410.30.77.215
5510.30.77.216/3010.30.77.217 – 10.30.77.21810.30.77.219
5610.30.77.220/3010.30.77.221 – 10.30.77.22210.30.77.223
5710.30.77.224/3010.30.77.225 – 10.30.77.22610.30.77.227
5810.30.77.228/3010.30.77.229 – 10.30.77.23010.30.77.231
5910.30.77.232/3010.30.77.233 – 10.30.77.23410.30.77.235
6010.30.77.236/3010.30.77.237 – 10.30.77.23810.30.77.239
6110.30.77.240/3010.30.77.241 – 10.30.77.24210.30.77.243
6210.30.77.244/3010.30.77.245 – 10.30.77.24610.30.77.247
6310.30.77.248/3010.30.77.249 – 10.30.77.25010.30.77.251
6410.30.77.252/3010.30.77.253 – 10.30.77.25410.30.77.255
01 / table

IPv4 CIDR prefix table.

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

prefixsubnet maskaddresseshostsin your /24
/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-
/24255.255.255.02562541
/25255.255.255.1281281262 split →
/26255.255.255.19264624 split →
/27255.255.255.22432308 split →
/28255.255.255.240161416 split →
/29255.255.255.2488632 split →
/30255.255.255.2524264 split →
/31255.255.255.25422128 split →
/32255.255.255.25511256 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 →