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)10.66.76.0/23
network10.66.76.0/23
broadcast10.66.77.255
first host10.66.76.1
last host10.66.77.254
subnet mask255.255.254.0
wildcard0.0.1.255
addresses512
usable hosts510
classA
ipcalc 10.66.76.0/23
address00001010.01000010.01001100.00000000
subnet mask11111111.11111111.11111110.00000000
network00001010.01000010.01001100.00000000
broadcast00001010.01000010.01001101.11111111
green = network part, grey = host part
hex0x0a424c00
decimal172116992
reverse dns0.76.66.10.in-addr.arpa
ipv4-mapped::ffff:a42:4c00

/23 split into /30 · 128 subnets

close ×
#networkhost rangebroadcast
110.66.76.0/3010.66.76.1 – 10.66.76.210.66.76.3
210.66.76.4/3010.66.76.5 – 10.66.76.610.66.76.7
310.66.76.8/3010.66.76.9 – 10.66.76.1010.66.76.11
410.66.76.12/3010.66.76.13 – 10.66.76.1410.66.76.15
510.66.76.16/3010.66.76.17 – 10.66.76.1810.66.76.19
610.66.76.20/3010.66.76.21 – 10.66.76.2210.66.76.23
710.66.76.24/3010.66.76.25 – 10.66.76.2610.66.76.27
810.66.76.28/3010.66.76.29 – 10.66.76.3010.66.76.31
910.66.76.32/3010.66.76.33 – 10.66.76.3410.66.76.35
1010.66.76.36/3010.66.76.37 – 10.66.76.3810.66.76.39
1110.66.76.40/3010.66.76.41 – 10.66.76.4210.66.76.43
1210.66.76.44/3010.66.76.45 – 10.66.76.4610.66.76.47
1310.66.76.48/3010.66.76.49 – 10.66.76.5010.66.76.51
1410.66.76.52/3010.66.76.53 – 10.66.76.5410.66.76.55
1510.66.76.56/3010.66.76.57 – 10.66.76.5810.66.76.59
1610.66.76.60/3010.66.76.61 – 10.66.76.6210.66.76.63
1710.66.76.64/3010.66.76.65 – 10.66.76.6610.66.76.67
1810.66.76.68/3010.66.76.69 – 10.66.76.7010.66.76.71
1910.66.76.72/3010.66.76.73 – 10.66.76.7410.66.76.75
2010.66.76.76/3010.66.76.77 – 10.66.76.7810.66.76.79
2110.66.76.80/3010.66.76.81 – 10.66.76.8210.66.76.83
2210.66.76.84/3010.66.76.85 – 10.66.76.8610.66.76.87
2310.66.76.88/3010.66.76.89 – 10.66.76.9010.66.76.91
2410.66.76.92/3010.66.76.93 – 10.66.76.9410.66.76.95
2510.66.76.96/3010.66.76.97 – 10.66.76.9810.66.76.99
2610.66.76.100/3010.66.76.101 – 10.66.76.10210.66.76.103
2710.66.76.104/3010.66.76.105 – 10.66.76.10610.66.76.107
2810.66.76.108/3010.66.76.109 – 10.66.76.11010.66.76.111
2910.66.76.112/3010.66.76.113 – 10.66.76.11410.66.76.115
3010.66.76.116/3010.66.76.117 – 10.66.76.11810.66.76.119
3110.66.76.120/3010.66.76.121 – 10.66.76.12210.66.76.123
3210.66.76.124/3010.66.76.125 – 10.66.76.12610.66.76.127
3310.66.76.128/3010.66.76.129 – 10.66.76.13010.66.76.131
3410.66.76.132/3010.66.76.133 – 10.66.76.13410.66.76.135
3510.66.76.136/3010.66.76.137 – 10.66.76.13810.66.76.139
3610.66.76.140/3010.66.76.141 – 10.66.76.14210.66.76.143
3710.66.76.144/3010.66.76.145 – 10.66.76.14610.66.76.147
3810.66.76.148/3010.66.76.149 – 10.66.76.15010.66.76.151
3910.66.76.152/3010.66.76.153 – 10.66.76.15410.66.76.155
4010.66.76.156/3010.66.76.157 – 10.66.76.15810.66.76.159
4110.66.76.160/3010.66.76.161 – 10.66.76.16210.66.76.163
4210.66.76.164/3010.66.76.165 – 10.66.76.16610.66.76.167
4310.66.76.168/3010.66.76.169 – 10.66.76.17010.66.76.171
4410.66.76.172/3010.66.76.173 – 10.66.76.17410.66.76.175
4510.66.76.176/3010.66.76.177 – 10.66.76.17810.66.76.179
4610.66.76.180/3010.66.76.181 – 10.66.76.18210.66.76.183
4710.66.76.184/3010.66.76.185 – 10.66.76.18610.66.76.187
4810.66.76.188/3010.66.76.189 – 10.66.76.19010.66.76.191
4910.66.76.192/3010.66.76.193 – 10.66.76.19410.66.76.195
5010.66.76.196/3010.66.76.197 – 10.66.76.19810.66.76.199
5110.66.76.200/3010.66.76.201 – 10.66.76.20210.66.76.203
5210.66.76.204/3010.66.76.205 – 10.66.76.20610.66.76.207
5310.66.76.208/3010.66.76.209 – 10.66.76.21010.66.76.211
5410.66.76.212/3010.66.76.213 – 10.66.76.21410.66.76.215
5510.66.76.216/3010.66.76.217 – 10.66.76.21810.66.76.219
5610.66.76.220/3010.66.76.221 – 10.66.76.22210.66.76.223
5710.66.76.224/3010.66.76.225 – 10.66.76.22610.66.76.227
5810.66.76.228/3010.66.76.229 – 10.66.76.23010.66.76.231
5910.66.76.232/3010.66.76.233 – 10.66.76.23410.66.76.235
6010.66.76.236/3010.66.76.237 – 10.66.76.23810.66.76.239
6110.66.76.240/3010.66.76.241 – 10.66.76.24210.66.76.243
6210.66.76.244/3010.66.76.245 – 10.66.76.24610.66.76.247
6310.66.76.248/3010.66.76.249 – 10.66.76.25010.66.76.251
6410.66.76.252/3010.66.76.253 – 10.66.76.25410.66.76.255
6510.66.77.0/3010.66.77.1 – 10.66.77.210.66.77.3
6610.66.77.4/3010.66.77.5 – 10.66.77.610.66.77.7
6710.66.77.8/3010.66.77.9 – 10.66.77.1010.66.77.11
6810.66.77.12/3010.66.77.13 – 10.66.77.1410.66.77.15
6910.66.77.16/3010.66.77.17 – 10.66.77.1810.66.77.19
7010.66.77.20/3010.66.77.21 – 10.66.77.2210.66.77.23
7110.66.77.24/3010.66.77.25 – 10.66.77.2610.66.77.27
7210.66.77.28/3010.66.77.29 – 10.66.77.3010.66.77.31
7310.66.77.32/3010.66.77.33 – 10.66.77.3410.66.77.35
7410.66.77.36/3010.66.77.37 – 10.66.77.3810.66.77.39
7510.66.77.40/3010.66.77.41 – 10.66.77.4210.66.77.43
7610.66.77.44/3010.66.77.45 – 10.66.77.4610.66.77.47
7710.66.77.48/3010.66.77.49 – 10.66.77.5010.66.77.51
7810.66.77.52/3010.66.77.53 – 10.66.77.5410.66.77.55
7910.66.77.56/3010.66.77.57 – 10.66.77.5810.66.77.59
8010.66.77.60/3010.66.77.61 – 10.66.77.6210.66.77.63
8110.66.77.64/3010.66.77.65 – 10.66.77.6610.66.77.67
8210.66.77.68/3010.66.77.69 – 10.66.77.7010.66.77.71
8310.66.77.72/3010.66.77.73 – 10.66.77.7410.66.77.75
8410.66.77.76/3010.66.77.77 – 10.66.77.7810.66.77.79
8510.66.77.80/3010.66.77.81 – 10.66.77.8210.66.77.83
8610.66.77.84/3010.66.77.85 – 10.66.77.8610.66.77.87
8710.66.77.88/3010.66.77.89 – 10.66.77.9010.66.77.91
8810.66.77.92/3010.66.77.93 – 10.66.77.9410.66.77.95
8910.66.77.96/3010.66.77.97 – 10.66.77.9810.66.77.99
9010.66.77.100/3010.66.77.101 – 10.66.77.10210.66.77.103
9110.66.77.104/3010.66.77.105 – 10.66.77.10610.66.77.107
9210.66.77.108/3010.66.77.109 – 10.66.77.11010.66.77.111
9310.66.77.112/3010.66.77.113 – 10.66.77.11410.66.77.115
9410.66.77.116/3010.66.77.117 – 10.66.77.11810.66.77.119
9510.66.77.120/3010.66.77.121 – 10.66.77.12210.66.77.123
9610.66.77.124/3010.66.77.125 – 10.66.77.12610.66.77.127
9710.66.77.128/3010.66.77.129 – 10.66.77.13010.66.77.131
9810.66.77.132/3010.66.77.133 – 10.66.77.13410.66.77.135
9910.66.77.136/3010.66.77.137 – 10.66.77.13810.66.77.139
10010.66.77.140/3010.66.77.141 – 10.66.77.14210.66.77.143
10110.66.77.144/3010.66.77.145 – 10.66.77.14610.66.77.147
10210.66.77.148/3010.66.77.149 – 10.66.77.15010.66.77.151
10310.66.77.152/3010.66.77.153 – 10.66.77.15410.66.77.155
10410.66.77.156/3010.66.77.157 – 10.66.77.15810.66.77.159
10510.66.77.160/3010.66.77.161 – 10.66.77.16210.66.77.163
10610.66.77.164/3010.66.77.165 – 10.66.77.16610.66.77.167
10710.66.77.168/3010.66.77.169 – 10.66.77.17010.66.77.171
10810.66.77.172/3010.66.77.173 – 10.66.77.17410.66.77.175
10910.66.77.176/3010.66.77.177 – 10.66.77.17810.66.77.179
11010.66.77.180/3010.66.77.181 – 10.66.77.18210.66.77.183
11110.66.77.184/3010.66.77.185 – 10.66.77.18610.66.77.187
11210.66.77.188/3010.66.77.189 – 10.66.77.19010.66.77.191
11310.66.77.192/3010.66.77.193 – 10.66.77.19410.66.77.195
11410.66.77.196/3010.66.77.197 – 10.66.77.19810.66.77.199
11510.66.77.200/3010.66.77.201 – 10.66.77.20210.66.77.203
11610.66.77.204/3010.66.77.205 – 10.66.77.20610.66.77.207
11710.66.77.208/3010.66.77.209 – 10.66.77.21010.66.77.211
11810.66.77.212/3010.66.77.213 – 10.66.77.21410.66.77.215
11910.66.77.216/3010.66.77.217 – 10.66.77.21810.66.77.219
12010.66.77.220/3010.66.77.221 – 10.66.77.22210.66.77.223
12110.66.77.224/3010.66.77.225 – 10.66.77.22610.66.77.227
12210.66.77.228/3010.66.77.229 – 10.66.77.23010.66.77.231
12310.66.77.232/3010.66.77.233 – 10.66.77.23410.66.77.235
12410.66.77.236/3010.66.77.237 – 10.66.77.23810.66.77.239
12510.66.77.240/3010.66.77.241 – 10.66.77.24210.66.77.243
12610.66.77.244/3010.66.77.245 – 10.66.77.24610.66.77.247
12710.66.77.248/3010.66.77.249 – 10.66.77.25010.66.77.251
12810.66.77.252/3010.66.77.253 – 10.66.77.25410.66.77.255
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 →