ip
ipku.in

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
private IP (RFC 1918)10.1.102.0/23
network10.1.102.0/23
broadcast10.1.103.255
first host10.1.102.1
last host10.1.103.254
subnet mask255.255.254.0
wildcard0.0.1.255
addresses512
usable hosts510
classA
ipcalc 10.1.102.0/23
address00001010.00000001.01100110.00000000
subnet mask11111111.11111111.11111110.00000000
network00001010.00000001.01100110.00000000
broadcast00001010.00000001.01100111.11111111
green = network part, grey = host part
hex0x0a016600
decimal167863808
reverse dns0.102.1.10.in-addr.arpa
ipv4-mapped::ffff:a01:6600

/23 split into /30 · 128 subnets

close ×
#networkhost rangebroadcast
110.1.102.0/3010.1.102.1 – 10.1.102.210.1.102.3
210.1.102.4/3010.1.102.5 – 10.1.102.610.1.102.7
310.1.102.8/3010.1.102.9 – 10.1.102.1010.1.102.11
410.1.102.12/3010.1.102.13 – 10.1.102.1410.1.102.15
510.1.102.16/3010.1.102.17 – 10.1.102.1810.1.102.19
610.1.102.20/3010.1.102.21 – 10.1.102.2210.1.102.23
710.1.102.24/3010.1.102.25 – 10.1.102.2610.1.102.27
810.1.102.28/3010.1.102.29 – 10.1.102.3010.1.102.31
910.1.102.32/3010.1.102.33 – 10.1.102.3410.1.102.35
1010.1.102.36/3010.1.102.37 – 10.1.102.3810.1.102.39
1110.1.102.40/3010.1.102.41 – 10.1.102.4210.1.102.43
1210.1.102.44/3010.1.102.45 – 10.1.102.4610.1.102.47
1310.1.102.48/3010.1.102.49 – 10.1.102.5010.1.102.51
1410.1.102.52/3010.1.102.53 – 10.1.102.5410.1.102.55
1510.1.102.56/3010.1.102.57 – 10.1.102.5810.1.102.59
1610.1.102.60/3010.1.102.61 – 10.1.102.6210.1.102.63
1710.1.102.64/3010.1.102.65 – 10.1.102.6610.1.102.67
1810.1.102.68/3010.1.102.69 – 10.1.102.7010.1.102.71
1910.1.102.72/3010.1.102.73 – 10.1.102.7410.1.102.75
2010.1.102.76/3010.1.102.77 – 10.1.102.7810.1.102.79
2110.1.102.80/3010.1.102.81 – 10.1.102.8210.1.102.83
2210.1.102.84/3010.1.102.85 – 10.1.102.8610.1.102.87
2310.1.102.88/3010.1.102.89 – 10.1.102.9010.1.102.91
2410.1.102.92/3010.1.102.93 – 10.1.102.9410.1.102.95
2510.1.102.96/3010.1.102.97 – 10.1.102.9810.1.102.99
2610.1.102.100/3010.1.102.101 – 10.1.102.10210.1.102.103
2710.1.102.104/3010.1.102.105 – 10.1.102.10610.1.102.107
2810.1.102.108/3010.1.102.109 – 10.1.102.11010.1.102.111
2910.1.102.112/3010.1.102.113 – 10.1.102.11410.1.102.115
3010.1.102.116/3010.1.102.117 – 10.1.102.11810.1.102.119
3110.1.102.120/3010.1.102.121 – 10.1.102.12210.1.102.123
3210.1.102.124/3010.1.102.125 – 10.1.102.12610.1.102.127
3310.1.102.128/3010.1.102.129 – 10.1.102.13010.1.102.131
3410.1.102.132/3010.1.102.133 – 10.1.102.13410.1.102.135
3510.1.102.136/3010.1.102.137 – 10.1.102.13810.1.102.139
3610.1.102.140/3010.1.102.141 – 10.1.102.14210.1.102.143
3710.1.102.144/3010.1.102.145 – 10.1.102.14610.1.102.147
3810.1.102.148/3010.1.102.149 – 10.1.102.15010.1.102.151
3910.1.102.152/3010.1.102.153 – 10.1.102.15410.1.102.155
4010.1.102.156/3010.1.102.157 – 10.1.102.15810.1.102.159
4110.1.102.160/3010.1.102.161 – 10.1.102.16210.1.102.163
4210.1.102.164/3010.1.102.165 – 10.1.102.16610.1.102.167
4310.1.102.168/3010.1.102.169 – 10.1.102.17010.1.102.171
4410.1.102.172/3010.1.102.173 – 10.1.102.17410.1.102.175
4510.1.102.176/3010.1.102.177 – 10.1.102.17810.1.102.179
4610.1.102.180/3010.1.102.181 – 10.1.102.18210.1.102.183
4710.1.102.184/3010.1.102.185 – 10.1.102.18610.1.102.187
4810.1.102.188/3010.1.102.189 – 10.1.102.19010.1.102.191
4910.1.102.192/3010.1.102.193 – 10.1.102.19410.1.102.195
5010.1.102.196/3010.1.102.197 – 10.1.102.19810.1.102.199
5110.1.102.200/3010.1.102.201 – 10.1.102.20210.1.102.203
5210.1.102.204/3010.1.102.205 – 10.1.102.20610.1.102.207
5310.1.102.208/3010.1.102.209 – 10.1.102.21010.1.102.211
5410.1.102.212/3010.1.102.213 – 10.1.102.21410.1.102.215
5510.1.102.216/3010.1.102.217 – 10.1.102.21810.1.102.219
5610.1.102.220/3010.1.102.221 – 10.1.102.22210.1.102.223
5710.1.102.224/3010.1.102.225 – 10.1.102.22610.1.102.227
5810.1.102.228/3010.1.102.229 – 10.1.102.23010.1.102.231
5910.1.102.232/3010.1.102.233 – 10.1.102.23410.1.102.235
6010.1.102.236/3010.1.102.237 – 10.1.102.23810.1.102.239
6110.1.102.240/3010.1.102.241 – 10.1.102.24210.1.102.243
6210.1.102.244/3010.1.102.245 – 10.1.102.24610.1.102.247
6310.1.102.248/3010.1.102.249 – 10.1.102.25010.1.102.251
6410.1.102.252/3010.1.102.253 – 10.1.102.25410.1.102.255
6510.1.103.0/3010.1.103.1 – 10.1.103.210.1.103.3
6610.1.103.4/3010.1.103.5 – 10.1.103.610.1.103.7
6710.1.103.8/3010.1.103.9 – 10.1.103.1010.1.103.11
6810.1.103.12/3010.1.103.13 – 10.1.103.1410.1.103.15
6910.1.103.16/3010.1.103.17 – 10.1.103.1810.1.103.19
7010.1.103.20/3010.1.103.21 – 10.1.103.2210.1.103.23
7110.1.103.24/3010.1.103.25 – 10.1.103.2610.1.103.27
7210.1.103.28/3010.1.103.29 – 10.1.103.3010.1.103.31
7310.1.103.32/3010.1.103.33 – 10.1.103.3410.1.103.35
7410.1.103.36/3010.1.103.37 – 10.1.103.3810.1.103.39
7510.1.103.40/3010.1.103.41 – 10.1.103.4210.1.103.43
7610.1.103.44/3010.1.103.45 – 10.1.103.4610.1.103.47
7710.1.103.48/3010.1.103.49 – 10.1.103.5010.1.103.51
7810.1.103.52/3010.1.103.53 – 10.1.103.5410.1.103.55
7910.1.103.56/3010.1.103.57 – 10.1.103.5810.1.103.59
8010.1.103.60/3010.1.103.61 – 10.1.103.6210.1.103.63
8110.1.103.64/3010.1.103.65 – 10.1.103.6610.1.103.67
8210.1.103.68/3010.1.103.69 – 10.1.103.7010.1.103.71
8310.1.103.72/3010.1.103.73 – 10.1.103.7410.1.103.75
8410.1.103.76/3010.1.103.77 – 10.1.103.7810.1.103.79
8510.1.103.80/3010.1.103.81 – 10.1.103.8210.1.103.83
8610.1.103.84/3010.1.103.85 – 10.1.103.8610.1.103.87
8710.1.103.88/3010.1.103.89 – 10.1.103.9010.1.103.91
8810.1.103.92/3010.1.103.93 – 10.1.103.9410.1.103.95
8910.1.103.96/3010.1.103.97 – 10.1.103.9810.1.103.99
9010.1.103.100/3010.1.103.101 – 10.1.103.10210.1.103.103
9110.1.103.104/3010.1.103.105 – 10.1.103.10610.1.103.107
9210.1.103.108/3010.1.103.109 – 10.1.103.11010.1.103.111
9310.1.103.112/3010.1.103.113 – 10.1.103.11410.1.103.115
9410.1.103.116/3010.1.103.117 – 10.1.103.11810.1.103.119
9510.1.103.120/3010.1.103.121 – 10.1.103.12210.1.103.123
9610.1.103.124/3010.1.103.125 – 10.1.103.12610.1.103.127
9710.1.103.128/3010.1.103.129 – 10.1.103.13010.1.103.131
9810.1.103.132/3010.1.103.133 – 10.1.103.13410.1.103.135
9910.1.103.136/3010.1.103.137 – 10.1.103.13810.1.103.139
10010.1.103.140/3010.1.103.141 – 10.1.103.14210.1.103.143
10110.1.103.144/3010.1.103.145 – 10.1.103.14610.1.103.147
10210.1.103.148/3010.1.103.149 – 10.1.103.15010.1.103.151
10310.1.103.152/3010.1.103.153 – 10.1.103.15410.1.103.155
10410.1.103.156/3010.1.103.157 – 10.1.103.15810.1.103.159
10510.1.103.160/3010.1.103.161 – 10.1.103.16210.1.103.163
10610.1.103.164/3010.1.103.165 – 10.1.103.16610.1.103.167
10710.1.103.168/3010.1.103.169 – 10.1.103.17010.1.103.171
10810.1.103.172/3010.1.103.173 – 10.1.103.17410.1.103.175
10910.1.103.176/3010.1.103.177 – 10.1.103.17810.1.103.179
11010.1.103.180/3010.1.103.181 – 10.1.103.18210.1.103.183
11110.1.103.184/3010.1.103.185 – 10.1.103.18610.1.103.187
11210.1.103.188/3010.1.103.189 – 10.1.103.19010.1.103.191
11310.1.103.192/3010.1.103.193 – 10.1.103.19410.1.103.195
11410.1.103.196/3010.1.103.197 – 10.1.103.19810.1.103.199
11510.1.103.200/3010.1.103.201 – 10.1.103.20210.1.103.203
11610.1.103.204/3010.1.103.205 – 10.1.103.20610.1.103.207
11710.1.103.208/3010.1.103.209 – 10.1.103.21010.1.103.211
11810.1.103.212/3010.1.103.213 – 10.1.103.21410.1.103.215
11910.1.103.216/3010.1.103.217 – 10.1.103.21810.1.103.219
12010.1.103.220/3010.1.103.221 – 10.1.103.22210.1.103.223
12110.1.103.224/3010.1.103.225 – 10.1.103.22610.1.103.227
12210.1.103.228/3010.1.103.229 – 10.1.103.23010.1.103.231
12310.1.103.232/3010.1.103.233 – 10.1.103.23410.1.103.235
12410.1.103.236/3010.1.103.237 – 10.1.103.23810.1.103.239
12510.1.103.240/3010.1.103.241 – 10.1.103.24210.1.103.243
12610.1.103.244/3010.1.103.245 – 10.1.103.24610.1.103.247
12710.1.103.248/3010.1.103.249 – 10.1.103.25010.1.103.251
12810.1.103.252/3010.1.103.253 – 10.1.103.25410.1.103.255
01 / table

IPv4 CIDR prefix table.

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

prefixsubnet maskaddresseshostsin your /23
/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-
/23255.255.254.05125101
/24255.255.255.02562542 split →
/25255.255.255.1281281264 split →
/26255.255.255.19264628 split →
/27255.255.255.224323016 split →
/28255.255.255.240161432 split →
/29255.255.255.2488664 split →
/30255.255.255.25242128 split →
/31255.255.255.25422256 split →
/32255.255.255.25511512 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 →