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)10.3.42.0/23
network10.3.42.0/23
broadcast10.3.43.255
first host10.3.42.1
last host10.3.43.254
subnet mask255.255.254.0
wildcard0.0.1.255
addresses512
usable hosts510
classA
ipcalc 10.3.42.0/23
address00001010.00000011.00101010.00000000
subnet mask11111111.11111111.11111110.00000000
network00001010.00000011.00101010.00000000
broadcast00001010.00000011.00101011.11111111
green = network part, grey = host part
hex0x0a032a00
decimal167979520
reverse dns0.42.3.10.in-addr.arpa
ipv4-mapped::ffff:a03:2a00

/23 split into /30 · 128 subnets

close ×
#networkhost rangebroadcast
110.3.42.0/3010.3.42.1 – 10.3.42.210.3.42.3
210.3.42.4/3010.3.42.5 – 10.3.42.610.3.42.7
310.3.42.8/3010.3.42.9 – 10.3.42.1010.3.42.11
410.3.42.12/3010.3.42.13 – 10.3.42.1410.3.42.15
510.3.42.16/3010.3.42.17 – 10.3.42.1810.3.42.19
610.3.42.20/3010.3.42.21 – 10.3.42.2210.3.42.23
710.3.42.24/3010.3.42.25 – 10.3.42.2610.3.42.27
810.3.42.28/3010.3.42.29 – 10.3.42.3010.3.42.31
910.3.42.32/3010.3.42.33 – 10.3.42.3410.3.42.35
1010.3.42.36/3010.3.42.37 – 10.3.42.3810.3.42.39
1110.3.42.40/3010.3.42.41 – 10.3.42.4210.3.42.43
1210.3.42.44/3010.3.42.45 – 10.3.42.4610.3.42.47
1310.3.42.48/3010.3.42.49 – 10.3.42.5010.3.42.51
1410.3.42.52/3010.3.42.53 – 10.3.42.5410.3.42.55
1510.3.42.56/3010.3.42.57 – 10.3.42.5810.3.42.59
1610.3.42.60/3010.3.42.61 – 10.3.42.6210.3.42.63
1710.3.42.64/3010.3.42.65 – 10.3.42.6610.3.42.67
1810.3.42.68/3010.3.42.69 – 10.3.42.7010.3.42.71
1910.3.42.72/3010.3.42.73 – 10.3.42.7410.3.42.75
2010.3.42.76/3010.3.42.77 – 10.3.42.7810.3.42.79
2110.3.42.80/3010.3.42.81 – 10.3.42.8210.3.42.83
2210.3.42.84/3010.3.42.85 – 10.3.42.8610.3.42.87
2310.3.42.88/3010.3.42.89 – 10.3.42.9010.3.42.91
2410.3.42.92/3010.3.42.93 – 10.3.42.9410.3.42.95
2510.3.42.96/3010.3.42.97 – 10.3.42.9810.3.42.99
2610.3.42.100/3010.3.42.101 – 10.3.42.10210.3.42.103
2710.3.42.104/3010.3.42.105 – 10.3.42.10610.3.42.107
2810.3.42.108/3010.3.42.109 – 10.3.42.11010.3.42.111
2910.3.42.112/3010.3.42.113 – 10.3.42.11410.3.42.115
3010.3.42.116/3010.3.42.117 – 10.3.42.11810.3.42.119
3110.3.42.120/3010.3.42.121 – 10.3.42.12210.3.42.123
3210.3.42.124/3010.3.42.125 – 10.3.42.12610.3.42.127
3310.3.42.128/3010.3.42.129 – 10.3.42.13010.3.42.131
3410.3.42.132/3010.3.42.133 – 10.3.42.13410.3.42.135
3510.3.42.136/3010.3.42.137 – 10.3.42.13810.3.42.139
3610.3.42.140/3010.3.42.141 – 10.3.42.14210.3.42.143
3710.3.42.144/3010.3.42.145 – 10.3.42.14610.3.42.147
3810.3.42.148/3010.3.42.149 – 10.3.42.15010.3.42.151
3910.3.42.152/3010.3.42.153 – 10.3.42.15410.3.42.155
4010.3.42.156/3010.3.42.157 – 10.3.42.15810.3.42.159
4110.3.42.160/3010.3.42.161 – 10.3.42.16210.3.42.163
4210.3.42.164/3010.3.42.165 – 10.3.42.16610.3.42.167
4310.3.42.168/3010.3.42.169 – 10.3.42.17010.3.42.171
4410.3.42.172/3010.3.42.173 – 10.3.42.17410.3.42.175
4510.3.42.176/3010.3.42.177 – 10.3.42.17810.3.42.179
4610.3.42.180/3010.3.42.181 – 10.3.42.18210.3.42.183
4710.3.42.184/3010.3.42.185 – 10.3.42.18610.3.42.187
4810.3.42.188/3010.3.42.189 – 10.3.42.19010.3.42.191
4910.3.42.192/3010.3.42.193 – 10.3.42.19410.3.42.195
5010.3.42.196/3010.3.42.197 – 10.3.42.19810.3.42.199
5110.3.42.200/3010.3.42.201 – 10.3.42.20210.3.42.203
5210.3.42.204/3010.3.42.205 – 10.3.42.20610.3.42.207
5310.3.42.208/3010.3.42.209 – 10.3.42.21010.3.42.211
5410.3.42.212/3010.3.42.213 – 10.3.42.21410.3.42.215
5510.3.42.216/3010.3.42.217 – 10.3.42.21810.3.42.219
5610.3.42.220/3010.3.42.221 – 10.3.42.22210.3.42.223
5710.3.42.224/3010.3.42.225 – 10.3.42.22610.3.42.227
5810.3.42.228/3010.3.42.229 – 10.3.42.23010.3.42.231
5910.3.42.232/3010.3.42.233 – 10.3.42.23410.3.42.235
6010.3.42.236/3010.3.42.237 – 10.3.42.23810.3.42.239
6110.3.42.240/3010.3.42.241 – 10.3.42.24210.3.42.243
6210.3.42.244/3010.3.42.245 – 10.3.42.24610.3.42.247
6310.3.42.248/3010.3.42.249 – 10.3.42.25010.3.42.251
6410.3.42.252/3010.3.42.253 – 10.3.42.25410.3.42.255
6510.3.43.0/3010.3.43.1 – 10.3.43.210.3.43.3
6610.3.43.4/3010.3.43.5 – 10.3.43.610.3.43.7
6710.3.43.8/3010.3.43.9 – 10.3.43.1010.3.43.11
6810.3.43.12/3010.3.43.13 – 10.3.43.1410.3.43.15
6910.3.43.16/3010.3.43.17 – 10.3.43.1810.3.43.19
7010.3.43.20/3010.3.43.21 – 10.3.43.2210.3.43.23
7110.3.43.24/3010.3.43.25 – 10.3.43.2610.3.43.27
7210.3.43.28/3010.3.43.29 – 10.3.43.3010.3.43.31
7310.3.43.32/3010.3.43.33 – 10.3.43.3410.3.43.35
7410.3.43.36/3010.3.43.37 – 10.3.43.3810.3.43.39
7510.3.43.40/3010.3.43.41 – 10.3.43.4210.3.43.43
7610.3.43.44/3010.3.43.45 – 10.3.43.4610.3.43.47
7710.3.43.48/3010.3.43.49 – 10.3.43.5010.3.43.51
7810.3.43.52/3010.3.43.53 – 10.3.43.5410.3.43.55
7910.3.43.56/3010.3.43.57 – 10.3.43.5810.3.43.59
8010.3.43.60/3010.3.43.61 – 10.3.43.6210.3.43.63
8110.3.43.64/3010.3.43.65 – 10.3.43.6610.3.43.67
8210.3.43.68/3010.3.43.69 – 10.3.43.7010.3.43.71
8310.3.43.72/3010.3.43.73 – 10.3.43.7410.3.43.75
8410.3.43.76/3010.3.43.77 – 10.3.43.7810.3.43.79
8510.3.43.80/3010.3.43.81 – 10.3.43.8210.3.43.83
8610.3.43.84/3010.3.43.85 – 10.3.43.8610.3.43.87
8710.3.43.88/3010.3.43.89 – 10.3.43.9010.3.43.91
8810.3.43.92/3010.3.43.93 – 10.3.43.9410.3.43.95
8910.3.43.96/3010.3.43.97 – 10.3.43.9810.3.43.99
9010.3.43.100/3010.3.43.101 – 10.3.43.10210.3.43.103
9110.3.43.104/3010.3.43.105 – 10.3.43.10610.3.43.107
9210.3.43.108/3010.3.43.109 – 10.3.43.11010.3.43.111
9310.3.43.112/3010.3.43.113 – 10.3.43.11410.3.43.115
9410.3.43.116/3010.3.43.117 – 10.3.43.11810.3.43.119
9510.3.43.120/3010.3.43.121 – 10.3.43.12210.3.43.123
9610.3.43.124/3010.3.43.125 – 10.3.43.12610.3.43.127
9710.3.43.128/3010.3.43.129 – 10.3.43.13010.3.43.131
9810.3.43.132/3010.3.43.133 – 10.3.43.13410.3.43.135
9910.3.43.136/3010.3.43.137 – 10.3.43.13810.3.43.139
10010.3.43.140/3010.3.43.141 – 10.3.43.14210.3.43.143
10110.3.43.144/3010.3.43.145 – 10.3.43.14610.3.43.147
10210.3.43.148/3010.3.43.149 – 10.3.43.15010.3.43.151
10310.3.43.152/3010.3.43.153 – 10.3.43.15410.3.43.155
10410.3.43.156/3010.3.43.157 – 10.3.43.15810.3.43.159
10510.3.43.160/3010.3.43.161 – 10.3.43.16210.3.43.163
10610.3.43.164/3010.3.43.165 – 10.3.43.16610.3.43.167
10710.3.43.168/3010.3.43.169 – 10.3.43.17010.3.43.171
10810.3.43.172/3010.3.43.173 – 10.3.43.17410.3.43.175
10910.3.43.176/3010.3.43.177 – 10.3.43.17810.3.43.179
11010.3.43.180/3010.3.43.181 – 10.3.43.18210.3.43.183
11110.3.43.184/3010.3.43.185 – 10.3.43.18610.3.43.187
11210.3.43.188/3010.3.43.189 – 10.3.43.19010.3.43.191
11310.3.43.192/3010.3.43.193 – 10.3.43.19410.3.43.195
11410.3.43.196/3010.3.43.197 – 10.3.43.19810.3.43.199
11510.3.43.200/3010.3.43.201 – 10.3.43.20210.3.43.203
11610.3.43.204/3010.3.43.205 – 10.3.43.20610.3.43.207
11710.3.43.208/3010.3.43.209 – 10.3.43.21010.3.43.211
11810.3.43.212/3010.3.43.213 – 10.3.43.21410.3.43.215
11910.3.43.216/3010.3.43.217 – 10.3.43.21810.3.43.219
12010.3.43.220/3010.3.43.221 – 10.3.43.22210.3.43.223
12110.3.43.224/3010.3.43.225 – 10.3.43.22610.3.43.227
12210.3.43.228/3010.3.43.229 – 10.3.43.23010.3.43.231
12310.3.43.232/3010.3.43.233 – 10.3.43.23410.3.43.235
12410.3.43.236/3010.3.43.237 – 10.3.43.23810.3.43.239
12510.3.43.240/3010.3.43.241 – 10.3.43.24210.3.43.243
12610.3.43.244/3010.3.43.245 – 10.3.43.24610.3.43.247
12710.3.43.248/3010.3.43.249 – 10.3.43.25010.3.43.251
12810.3.43.252/3010.3.43.253 – 10.3.43.25410.3.43.255
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 →