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
Try:192.168.1.10/2410.0.0.0/8172.16.5.4/20203.0.113.9/29
IPv6 calculator →
private IP (RFC 1918)10.3.66.0/23
network10.3.66.0/23
broadcast10.3.67.255
first host10.3.66.1
last host10.3.67.254
subnet mask255.255.254.0
wildcard0.0.1.255
addresses512
usable hosts510
classA
ipcalc 10.3.66.0/23
address00001010.00000011.01000010.00000000
subnet mask11111111.11111111.11111110.00000000
network00001010.00000011.01000010.00000000
broadcast00001010.00000011.01000011.11111111
green = network part, grey = host part
hex0x0a034200
decimal167985664
reverse dns0.66.3.10.in-addr.arpa
ipv4-mapped::ffff:a03:4200

/23 split into /30 · 128 subnets

close ×
#networkhost rangebroadcast
110.3.66.0/3010.3.66.1 – 10.3.66.210.3.66.3
210.3.66.4/3010.3.66.5 – 10.3.66.610.3.66.7
310.3.66.8/3010.3.66.9 – 10.3.66.1010.3.66.11
410.3.66.12/3010.3.66.13 – 10.3.66.1410.3.66.15
510.3.66.16/3010.3.66.17 – 10.3.66.1810.3.66.19
610.3.66.20/3010.3.66.21 – 10.3.66.2210.3.66.23
710.3.66.24/3010.3.66.25 – 10.3.66.2610.3.66.27
810.3.66.28/3010.3.66.29 – 10.3.66.3010.3.66.31
910.3.66.32/3010.3.66.33 – 10.3.66.3410.3.66.35
1010.3.66.36/3010.3.66.37 – 10.3.66.3810.3.66.39
1110.3.66.40/3010.3.66.41 – 10.3.66.4210.3.66.43
1210.3.66.44/3010.3.66.45 – 10.3.66.4610.3.66.47
1310.3.66.48/3010.3.66.49 – 10.3.66.5010.3.66.51
1410.3.66.52/3010.3.66.53 – 10.3.66.5410.3.66.55
1510.3.66.56/3010.3.66.57 – 10.3.66.5810.3.66.59
1610.3.66.60/3010.3.66.61 – 10.3.66.6210.3.66.63
1710.3.66.64/3010.3.66.65 – 10.3.66.6610.3.66.67
1810.3.66.68/3010.3.66.69 – 10.3.66.7010.3.66.71
1910.3.66.72/3010.3.66.73 – 10.3.66.7410.3.66.75
2010.3.66.76/3010.3.66.77 – 10.3.66.7810.3.66.79
2110.3.66.80/3010.3.66.81 – 10.3.66.8210.3.66.83
2210.3.66.84/3010.3.66.85 – 10.3.66.8610.3.66.87
2310.3.66.88/3010.3.66.89 – 10.3.66.9010.3.66.91
2410.3.66.92/3010.3.66.93 – 10.3.66.9410.3.66.95
2510.3.66.96/3010.3.66.97 – 10.3.66.9810.3.66.99
2610.3.66.100/3010.3.66.101 – 10.3.66.10210.3.66.103
2710.3.66.104/3010.3.66.105 – 10.3.66.10610.3.66.107
2810.3.66.108/3010.3.66.109 – 10.3.66.11010.3.66.111
2910.3.66.112/3010.3.66.113 – 10.3.66.11410.3.66.115
3010.3.66.116/3010.3.66.117 – 10.3.66.11810.3.66.119
3110.3.66.120/3010.3.66.121 – 10.3.66.12210.3.66.123
3210.3.66.124/3010.3.66.125 – 10.3.66.12610.3.66.127
3310.3.66.128/3010.3.66.129 – 10.3.66.13010.3.66.131
3410.3.66.132/3010.3.66.133 – 10.3.66.13410.3.66.135
3510.3.66.136/3010.3.66.137 – 10.3.66.13810.3.66.139
3610.3.66.140/3010.3.66.141 – 10.3.66.14210.3.66.143
3710.3.66.144/3010.3.66.145 – 10.3.66.14610.3.66.147
3810.3.66.148/3010.3.66.149 – 10.3.66.15010.3.66.151
3910.3.66.152/3010.3.66.153 – 10.3.66.15410.3.66.155
4010.3.66.156/3010.3.66.157 – 10.3.66.15810.3.66.159
4110.3.66.160/3010.3.66.161 – 10.3.66.16210.3.66.163
4210.3.66.164/3010.3.66.165 – 10.3.66.16610.3.66.167
4310.3.66.168/3010.3.66.169 – 10.3.66.17010.3.66.171
4410.3.66.172/3010.3.66.173 – 10.3.66.17410.3.66.175
4510.3.66.176/3010.3.66.177 – 10.3.66.17810.3.66.179
4610.3.66.180/3010.3.66.181 – 10.3.66.18210.3.66.183
4710.3.66.184/3010.3.66.185 – 10.3.66.18610.3.66.187
4810.3.66.188/3010.3.66.189 – 10.3.66.19010.3.66.191
4910.3.66.192/3010.3.66.193 – 10.3.66.19410.3.66.195
5010.3.66.196/3010.3.66.197 – 10.3.66.19810.3.66.199
5110.3.66.200/3010.3.66.201 – 10.3.66.20210.3.66.203
5210.3.66.204/3010.3.66.205 – 10.3.66.20610.3.66.207
5310.3.66.208/3010.3.66.209 – 10.3.66.21010.3.66.211
5410.3.66.212/3010.3.66.213 – 10.3.66.21410.3.66.215
5510.3.66.216/3010.3.66.217 – 10.3.66.21810.3.66.219
5610.3.66.220/3010.3.66.221 – 10.3.66.22210.3.66.223
5710.3.66.224/3010.3.66.225 – 10.3.66.22610.3.66.227
5810.3.66.228/3010.3.66.229 – 10.3.66.23010.3.66.231
5910.3.66.232/3010.3.66.233 – 10.3.66.23410.3.66.235
6010.3.66.236/3010.3.66.237 – 10.3.66.23810.3.66.239
6110.3.66.240/3010.3.66.241 – 10.3.66.24210.3.66.243
6210.3.66.244/3010.3.66.245 – 10.3.66.24610.3.66.247
6310.3.66.248/3010.3.66.249 – 10.3.66.25010.3.66.251
6410.3.66.252/3010.3.66.253 – 10.3.66.25410.3.66.255
6510.3.67.0/3010.3.67.1 – 10.3.67.210.3.67.3
6610.3.67.4/3010.3.67.5 – 10.3.67.610.3.67.7
6710.3.67.8/3010.3.67.9 – 10.3.67.1010.3.67.11
6810.3.67.12/3010.3.67.13 – 10.3.67.1410.3.67.15
6910.3.67.16/3010.3.67.17 – 10.3.67.1810.3.67.19
7010.3.67.20/3010.3.67.21 – 10.3.67.2210.3.67.23
7110.3.67.24/3010.3.67.25 – 10.3.67.2610.3.67.27
7210.3.67.28/3010.3.67.29 – 10.3.67.3010.3.67.31
7310.3.67.32/3010.3.67.33 – 10.3.67.3410.3.67.35
7410.3.67.36/3010.3.67.37 – 10.3.67.3810.3.67.39
7510.3.67.40/3010.3.67.41 – 10.3.67.4210.3.67.43
7610.3.67.44/3010.3.67.45 – 10.3.67.4610.3.67.47
7710.3.67.48/3010.3.67.49 – 10.3.67.5010.3.67.51
7810.3.67.52/3010.3.67.53 – 10.3.67.5410.3.67.55
7910.3.67.56/3010.3.67.57 – 10.3.67.5810.3.67.59
8010.3.67.60/3010.3.67.61 – 10.3.67.6210.3.67.63
8110.3.67.64/3010.3.67.65 – 10.3.67.6610.3.67.67
8210.3.67.68/3010.3.67.69 – 10.3.67.7010.3.67.71
8310.3.67.72/3010.3.67.73 – 10.3.67.7410.3.67.75
8410.3.67.76/3010.3.67.77 – 10.3.67.7810.3.67.79
8510.3.67.80/3010.3.67.81 – 10.3.67.8210.3.67.83
8610.3.67.84/3010.3.67.85 – 10.3.67.8610.3.67.87
8710.3.67.88/3010.3.67.89 – 10.3.67.9010.3.67.91
8810.3.67.92/3010.3.67.93 – 10.3.67.9410.3.67.95
8910.3.67.96/3010.3.67.97 – 10.3.67.9810.3.67.99
9010.3.67.100/3010.3.67.101 – 10.3.67.10210.3.67.103
9110.3.67.104/3010.3.67.105 – 10.3.67.10610.3.67.107
9210.3.67.108/3010.3.67.109 – 10.3.67.11010.3.67.111
9310.3.67.112/3010.3.67.113 – 10.3.67.11410.3.67.115
9410.3.67.116/3010.3.67.117 – 10.3.67.11810.3.67.119
9510.3.67.120/3010.3.67.121 – 10.3.67.12210.3.67.123
9610.3.67.124/3010.3.67.125 – 10.3.67.12610.3.67.127
9710.3.67.128/3010.3.67.129 – 10.3.67.13010.3.67.131
9810.3.67.132/3010.3.67.133 – 10.3.67.13410.3.67.135
9910.3.67.136/3010.3.67.137 – 10.3.67.13810.3.67.139
10010.3.67.140/3010.3.67.141 – 10.3.67.14210.3.67.143
10110.3.67.144/3010.3.67.145 – 10.3.67.14610.3.67.147
10210.3.67.148/3010.3.67.149 – 10.3.67.15010.3.67.151
10310.3.67.152/3010.3.67.153 – 10.3.67.15410.3.67.155
10410.3.67.156/3010.3.67.157 – 10.3.67.15810.3.67.159
10510.3.67.160/3010.3.67.161 – 10.3.67.16210.3.67.163
10610.3.67.164/3010.3.67.165 – 10.3.67.16610.3.67.167
10710.3.67.168/3010.3.67.169 – 10.3.67.17010.3.67.171
10810.3.67.172/3010.3.67.173 – 10.3.67.17410.3.67.175
10910.3.67.176/3010.3.67.177 – 10.3.67.17810.3.67.179
11010.3.67.180/3010.3.67.181 – 10.3.67.18210.3.67.183
11110.3.67.184/3010.3.67.185 – 10.3.67.18610.3.67.187
11210.3.67.188/3010.3.67.189 – 10.3.67.19010.3.67.191
11310.3.67.192/3010.3.67.193 – 10.3.67.19410.3.67.195
11410.3.67.196/3010.3.67.197 – 10.3.67.19810.3.67.199
11510.3.67.200/3010.3.67.201 – 10.3.67.20210.3.67.203
11610.3.67.204/3010.3.67.205 – 10.3.67.20610.3.67.207
11710.3.67.208/3010.3.67.209 – 10.3.67.21010.3.67.211
11810.3.67.212/3010.3.67.213 – 10.3.67.21410.3.67.215
11910.3.67.216/3010.3.67.217 – 10.3.67.21810.3.67.219
12010.3.67.220/3010.3.67.221 – 10.3.67.22210.3.67.223
12110.3.67.224/3010.3.67.225 – 10.3.67.22610.3.67.227
12210.3.67.228/3010.3.67.229 – 10.3.67.23010.3.67.231
12310.3.67.232/3010.3.67.233 – 10.3.67.23410.3.67.235
12410.3.67.236/3010.3.67.237 – 10.3.67.23810.3.67.239
12510.3.67.240/3010.3.67.241 – 10.3.67.24210.3.67.243
12610.3.67.244/3010.3.67.245 – 10.3.67.24610.3.67.247
12710.3.67.248/3010.3.67.249 – 10.3.67.25010.3.67.251
12810.3.67.252/3010.3.67.253 – 10.3.67.25410.3.67.255
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 →