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)10.65.64.0/23
network10.65.64.0/23
broadcast10.65.65.255
first host10.65.64.1
last host10.65.65.254
subnet mask255.255.254.0
wildcard0.0.1.255
addresses512
usable hosts510
classA
ipcalc 10.65.64.0/23
address00001010.01000001.01000000.00000000
subnet mask11111111.11111111.11111110.00000000
network00001010.01000001.01000000.00000000
broadcast00001010.01000001.01000001.11111111
green = network part, grey = host part
hex0x0a414000
decimal172048384
reverse dns0.64.65.10.in-addr.arpa
ipv4-mapped::ffff:a41:4000

/23 split into /30 · 128 subnets

close ×
#networkhost rangebroadcast
110.65.64.0/3010.65.64.1 – 10.65.64.210.65.64.3
210.65.64.4/3010.65.64.5 – 10.65.64.610.65.64.7
310.65.64.8/3010.65.64.9 – 10.65.64.1010.65.64.11
410.65.64.12/3010.65.64.13 – 10.65.64.1410.65.64.15
510.65.64.16/3010.65.64.17 – 10.65.64.1810.65.64.19
610.65.64.20/3010.65.64.21 – 10.65.64.2210.65.64.23
710.65.64.24/3010.65.64.25 – 10.65.64.2610.65.64.27
810.65.64.28/3010.65.64.29 – 10.65.64.3010.65.64.31
910.65.64.32/3010.65.64.33 – 10.65.64.3410.65.64.35
1010.65.64.36/3010.65.64.37 – 10.65.64.3810.65.64.39
1110.65.64.40/3010.65.64.41 – 10.65.64.4210.65.64.43
1210.65.64.44/3010.65.64.45 – 10.65.64.4610.65.64.47
1310.65.64.48/3010.65.64.49 – 10.65.64.5010.65.64.51
1410.65.64.52/3010.65.64.53 – 10.65.64.5410.65.64.55
1510.65.64.56/3010.65.64.57 – 10.65.64.5810.65.64.59
1610.65.64.60/3010.65.64.61 – 10.65.64.6210.65.64.63
1710.65.64.64/3010.65.64.65 – 10.65.64.6610.65.64.67
1810.65.64.68/3010.65.64.69 – 10.65.64.7010.65.64.71
1910.65.64.72/3010.65.64.73 – 10.65.64.7410.65.64.75
2010.65.64.76/3010.65.64.77 – 10.65.64.7810.65.64.79
2110.65.64.80/3010.65.64.81 – 10.65.64.8210.65.64.83
2210.65.64.84/3010.65.64.85 – 10.65.64.8610.65.64.87
2310.65.64.88/3010.65.64.89 – 10.65.64.9010.65.64.91
2410.65.64.92/3010.65.64.93 – 10.65.64.9410.65.64.95
2510.65.64.96/3010.65.64.97 – 10.65.64.9810.65.64.99
2610.65.64.100/3010.65.64.101 – 10.65.64.10210.65.64.103
2710.65.64.104/3010.65.64.105 – 10.65.64.10610.65.64.107
2810.65.64.108/3010.65.64.109 – 10.65.64.11010.65.64.111
2910.65.64.112/3010.65.64.113 – 10.65.64.11410.65.64.115
3010.65.64.116/3010.65.64.117 – 10.65.64.11810.65.64.119
3110.65.64.120/3010.65.64.121 – 10.65.64.12210.65.64.123
3210.65.64.124/3010.65.64.125 – 10.65.64.12610.65.64.127
3310.65.64.128/3010.65.64.129 – 10.65.64.13010.65.64.131
3410.65.64.132/3010.65.64.133 – 10.65.64.13410.65.64.135
3510.65.64.136/3010.65.64.137 – 10.65.64.13810.65.64.139
3610.65.64.140/3010.65.64.141 – 10.65.64.14210.65.64.143
3710.65.64.144/3010.65.64.145 – 10.65.64.14610.65.64.147
3810.65.64.148/3010.65.64.149 – 10.65.64.15010.65.64.151
3910.65.64.152/3010.65.64.153 – 10.65.64.15410.65.64.155
4010.65.64.156/3010.65.64.157 – 10.65.64.15810.65.64.159
4110.65.64.160/3010.65.64.161 – 10.65.64.16210.65.64.163
4210.65.64.164/3010.65.64.165 – 10.65.64.16610.65.64.167
4310.65.64.168/3010.65.64.169 – 10.65.64.17010.65.64.171
4410.65.64.172/3010.65.64.173 – 10.65.64.17410.65.64.175
4510.65.64.176/3010.65.64.177 – 10.65.64.17810.65.64.179
4610.65.64.180/3010.65.64.181 – 10.65.64.18210.65.64.183
4710.65.64.184/3010.65.64.185 – 10.65.64.18610.65.64.187
4810.65.64.188/3010.65.64.189 – 10.65.64.19010.65.64.191
4910.65.64.192/3010.65.64.193 – 10.65.64.19410.65.64.195
5010.65.64.196/3010.65.64.197 – 10.65.64.19810.65.64.199
5110.65.64.200/3010.65.64.201 – 10.65.64.20210.65.64.203
5210.65.64.204/3010.65.64.205 – 10.65.64.20610.65.64.207
5310.65.64.208/3010.65.64.209 – 10.65.64.21010.65.64.211
5410.65.64.212/3010.65.64.213 – 10.65.64.21410.65.64.215
5510.65.64.216/3010.65.64.217 – 10.65.64.21810.65.64.219
5610.65.64.220/3010.65.64.221 – 10.65.64.22210.65.64.223
5710.65.64.224/3010.65.64.225 – 10.65.64.22610.65.64.227
5810.65.64.228/3010.65.64.229 – 10.65.64.23010.65.64.231
5910.65.64.232/3010.65.64.233 – 10.65.64.23410.65.64.235
6010.65.64.236/3010.65.64.237 – 10.65.64.23810.65.64.239
6110.65.64.240/3010.65.64.241 – 10.65.64.24210.65.64.243
6210.65.64.244/3010.65.64.245 – 10.65.64.24610.65.64.247
6310.65.64.248/3010.65.64.249 – 10.65.64.25010.65.64.251
6410.65.64.252/3010.65.64.253 – 10.65.64.25410.65.64.255
6510.65.65.0/3010.65.65.1 – 10.65.65.210.65.65.3
6610.65.65.4/3010.65.65.5 – 10.65.65.610.65.65.7
6710.65.65.8/3010.65.65.9 – 10.65.65.1010.65.65.11
6810.65.65.12/3010.65.65.13 – 10.65.65.1410.65.65.15
6910.65.65.16/3010.65.65.17 – 10.65.65.1810.65.65.19
7010.65.65.20/3010.65.65.21 – 10.65.65.2210.65.65.23
7110.65.65.24/3010.65.65.25 – 10.65.65.2610.65.65.27
7210.65.65.28/3010.65.65.29 – 10.65.65.3010.65.65.31
7310.65.65.32/3010.65.65.33 – 10.65.65.3410.65.65.35
7410.65.65.36/3010.65.65.37 – 10.65.65.3810.65.65.39
7510.65.65.40/3010.65.65.41 – 10.65.65.4210.65.65.43
7610.65.65.44/3010.65.65.45 – 10.65.65.4610.65.65.47
7710.65.65.48/3010.65.65.49 – 10.65.65.5010.65.65.51
7810.65.65.52/3010.65.65.53 – 10.65.65.5410.65.65.55
7910.65.65.56/3010.65.65.57 – 10.65.65.5810.65.65.59
8010.65.65.60/3010.65.65.61 – 10.65.65.6210.65.65.63
8110.65.65.64/3010.65.65.65 – 10.65.65.6610.65.65.67
8210.65.65.68/3010.65.65.69 – 10.65.65.7010.65.65.71
8310.65.65.72/3010.65.65.73 – 10.65.65.7410.65.65.75
8410.65.65.76/3010.65.65.77 – 10.65.65.7810.65.65.79
8510.65.65.80/3010.65.65.81 – 10.65.65.8210.65.65.83
8610.65.65.84/3010.65.65.85 – 10.65.65.8610.65.65.87
8710.65.65.88/3010.65.65.89 – 10.65.65.9010.65.65.91
8810.65.65.92/3010.65.65.93 – 10.65.65.9410.65.65.95
8910.65.65.96/3010.65.65.97 – 10.65.65.9810.65.65.99
9010.65.65.100/3010.65.65.101 – 10.65.65.10210.65.65.103
9110.65.65.104/3010.65.65.105 – 10.65.65.10610.65.65.107
9210.65.65.108/3010.65.65.109 – 10.65.65.11010.65.65.111
9310.65.65.112/3010.65.65.113 – 10.65.65.11410.65.65.115
9410.65.65.116/3010.65.65.117 – 10.65.65.11810.65.65.119
9510.65.65.120/3010.65.65.121 – 10.65.65.12210.65.65.123
9610.65.65.124/3010.65.65.125 – 10.65.65.12610.65.65.127
9710.65.65.128/3010.65.65.129 – 10.65.65.13010.65.65.131
9810.65.65.132/3010.65.65.133 – 10.65.65.13410.65.65.135
9910.65.65.136/3010.65.65.137 – 10.65.65.13810.65.65.139
10010.65.65.140/3010.65.65.141 – 10.65.65.14210.65.65.143
10110.65.65.144/3010.65.65.145 – 10.65.65.14610.65.65.147
10210.65.65.148/3010.65.65.149 – 10.65.65.15010.65.65.151
10310.65.65.152/3010.65.65.153 – 10.65.65.15410.65.65.155
10410.65.65.156/3010.65.65.157 – 10.65.65.15810.65.65.159
10510.65.65.160/3010.65.65.161 – 10.65.65.16210.65.65.163
10610.65.65.164/3010.65.65.165 – 10.65.65.16610.65.65.167
10710.65.65.168/3010.65.65.169 – 10.65.65.17010.65.65.171
10810.65.65.172/3010.65.65.173 – 10.65.65.17410.65.65.175
10910.65.65.176/3010.65.65.177 – 10.65.65.17810.65.65.179
11010.65.65.180/3010.65.65.181 – 10.65.65.18210.65.65.183
11110.65.65.184/3010.65.65.185 – 10.65.65.18610.65.65.187
11210.65.65.188/3010.65.65.189 – 10.65.65.19010.65.65.191
11310.65.65.192/3010.65.65.193 – 10.65.65.19410.65.65.195
11410.65.65.196/3010.65.65.197 – 10.65.65.19810.65.65.199
11510.65.65.200/3010.65.65.201 – 10.65.65.20210.65.65.203
11610.65.65.204/3010.65.65.205 – 10.65.65.20610.65.65.207
11710.65.65.208/3010.65.65.209 – 10.65.65.21010.65.65.211
11810.65.65.212/3010.65.65.213 – 10.65.65.21410.65.65.215
11910.65.65.216/3010.65.65.217 – 10.65.65.21810.65.65.219
12010.65.65.220/3010.65.65.221 – 10.65.65.22210.65.65.223
12110.65.65.224/3010.65.65.225 – 10.65.65.22610.65.65.227
12210.65.65.228/3010.65.65.229 – 10.65.65.23010.65.65.231
12310.65.65.232/3010.65.65.233 – 10.65.65.23410.65.65.235
12410.65.65.236/3010.65.65.237 – 10.65.65.23810.65.65.239
12510.65.65.240/3010.65.65.241 – 10.65.65.24210.65.65.243
12610.65.65.244/3010.65.65.245 – 10.65.65.24610.65.65.247
12710.65.65.248/3010.65.65.249 – 10.65.65.25010.65.65.251
12810.65.65.252/3010.65.65.253 – 10.65.65.25410.65.65.255
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 →