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)10.2.40.0/21
network10.2.40.0/21
broadcast10.2.47.255
first host10.2.40.1
last host10.2.47.254
subnet mask255.255.248.0
wildcard0.0.7.255
addresses2,048
usable hosts2,046
classA
ipcalc 10.2.40.0/21
address00001010.00000010.00101000.00000000
subnet mask11111111.11111111.11111000.00000000
network00001010.00000010.00101000.00000000
broadcast00001010.00000010.00101111.11111111
green = network part, grey = host part
hex0x0a022800
decimal167913472
reverse dns0.40.2.10.in-addr.arpa
ipv4-mapped::ffff:a02:2800

/21 split into /29 · 256 subnets

close ×
#networkhost rangebroadcast
110.2.40.0/2910.2.40.1 – 10.2.40.610.2.40.7
210.2.40.8/2910.2.40.9 – 10.2.40.1410.2.40.15
310.2.40.16/2910.2.40.17 – 10.2.40.2210.2.40.23
410.2.40.24/2910.2.40.25 – 10.2.40.3010.2.40.31
510.2.40.32/2910.2.40.33 – 10.2.40.3810.2.40.39
610.2.40.40/2910.2.40.41 – 10.2.40.4610.2.40.47
710.2.40.48/2910.2.40.49 – 10.2.40.5410.2.40.55
810.2.40.56/2910.2.40.57 – 10.2.40.6210.2.40.63
910.2.40.64/2910.2.40.65 – 10.2.40.7010.2.40.71
1010.2.40.72/2910.2.40.73 – 10.2.40.7810.2.40.79
1110.2.40.80/2910.2.40.81 – 10.2.40.8610.2.40.87
1210.2.40.88/2910.2.40.89 – 10.2.40.9410.2.40.95
1310.2.40.96/2910.2.40.97 – 10.2.40.10210.2.40.103
1410.2.40.104/2910.2.40.105 – 10.2.40.11010.2.40.111
1510.2.40.112/2910.2.40.113 – 10.2.40.11810.2.40.119
1610.2.40.120/2910.2.40.121 – 10.2.40.12610.2.40.127
1710.2.40.128/2910.2.40.129 – 10.2.40.13410.2.40.135
1810.2.40.136/2910.2.40.137 – 10.2.40.14210.2.40.143
1910.2.40.144/2910.2.40.145 – 10.2.40.15010.2.40.151
2010.2.40.152/2910.2.40.153 – 10.2.40.15810.2.40.159
2110.2.40.160/2910.2.40.161 – 10.2.40.16610.2.40.167
2210.2.40.168/2910.2.40.169 – 10.2.40.17410.2.40.175
2310.2.40.176/2910.2.40.177 – 10.2.40.18210.2.40.183
2410.2.40.184/2910.2.40.185 – 10.2.40.19010.2.40.191
2510.2.40.192/2910.2.40.193 – 10.2.40.19810.2.40.199
2610.2.40.200/2910.2.40.201 – 10.2.40.20610.2.40.207
2710.2.40.208/2910.2.40.209 – 10.2.40.21410.2.40.215
2810.2.40.216/2910.2.40.217 – 10.2.40.22210.2.40.223
2910.2.40.224/2910.2.40.225 – 10.2.40.23010.2.40.231
3010.2.40.232/2910.2.40.233 – 10.2.40.23810.2.40.239
3110.2.40.240/2910.2.40.241 – 10.2.40.24610.2.40.247
3210.2.40.248/2910.2.40.249 – 10.2.40.25410.2.40.255
3310.2.41.0/2910.2.41.1 – 10.2.41.610.2.41.7
3410.2.41.8/2910.2.41.9 – 10.2.41.1410.2.41.15
3510.2.41.16/2910.2.41.17 – 10.2.41.2210.2.41.23
3610.2.41.24/2910.2.41.25 – 10.2.41.3010.2.41.31
3710.2.41.32/2910.2.41.33 – 10.2.41.3810.2.41.39
3810.2.41.40/2910.2.41.41 – 10.2.41.4610.2.41.47
3910.2.41.48/2910.2.41.49 – 10.2.41.5410.2.41.55
4010.2.41.56/2910.2.41.57 – 10.2.41.6210.2.41.63
4110.2.41.64/2910.2.41.65 – 10.2.41.7010.2.41.71
4210.2.41.72/2910.2.41.73 – 10.2.41.7810.2.41.79
4310.2.41.80/2910.2.41.81 – 10.2.41.8610.2.41.87
4410.2.41.88/2910.2.41.89 – 10.2.41.9410.2.41.95
4510.2.41.96/2910.2.41.97 – 10.2.41.10210.2.41.103
4610.2.41.104/2910.2.41.105 – 10.2.41.11010.2.41.111
4710.2.41.112/2910.2.41.113 – 10.2.41.11810.2.41.119
4810.2.41.120/2910.2.41.121 – 10.2.41.12610.2.41.127
4910.2.41.128/2910.2.41.129 – 10.2.41.13410.2.41.135
5010.2.41.136/2910.2.41.137 – 10.2.41.14210.2.41.143
5110.2.41.144/2910.2.41.145 – 10.2.41.15010.2.41.151
5210.2.41.152/2910.2.41.153 – 10.2.41.15810.2.41.159
5310.2.41.160/2910.2.41.161 – 10.2.41.16610.2.41.167
5410.2.41.168/2910.2.41.169 – 10.2.41.17410.2.41.175
5510.2.41.176/2910.2.41.177 – 10.2.41.18210.2.41.183
5610.2.41.184/2910.2.41.185 – 10.2.41.19010.2.41.191
5710.2.41.192/2910.2.41.193 – 10.2.41.19810.2.41.199
5810.2.41.200/2910.2.41.201 – 10.2.41.20610.2.41.207
5910.2.41.208/2910.2.41.209 – 10.2.41.21410.2.41.215
6010.2.41.216/2910.2.41.217 – 10.2.41.22210.2.41.223
6110.2.41.224/2910.2.41.225 – 10.2.41.23010.2.41.231
6210.2.41.232/2910.2.41.233 – 10.2.41.23810.2.41.239
6310.2.41.240/2910.2.41.241 – 10.2.41.24610.2.41.247
6410.2.41.248/2910.2.41.249 – 10.2.41.25410.2.41.255
6510.2.42.0/2910.2.42.1 – 10.2.42.610.2.42.7
6610.2.42.8/2910.2.42.9 – 10.2.42.1410.2.42.15
6710.2.42.16/2910.2.42.17 – 10.2.42.2210.2.42.23
6810.2.42.24/2910.2.42.25 – 10.2.42.3010.2.42.31
6910.2.42.32/2910.2.42.33 – 10.2.42.3810.2.42.39
7010.2.42.40/2910.2.42.41 – 10.2.42.4610.2.42.47
7110.2.42.48/2910.2.42.49 – 10.2.42.5410.2.42.55
7210.2.42.56/2910.2.42.57 – 10.2.42.6210.2.42.63
7310.2.42.64/2910.2.42.65 – 10.2.42.7010.2.42.71
7410.2.42.72/2910.2.42.73 – 10.2.42.7810.2.42.79
7510.2.42.80/2910.2.42.81 – 10.2.42.8610.2.42.87
7610.2.42.88/2910.2.42.89 – 10.2.42.9410.2.42.95
7710.2.42.96/2910.2.42.97 – 10.2.42.10210.2.42.103
7810.2.42.104/2910.2.42.105 – 10.2.42.11010.2.42.111
7910.2.42.112/2910.2.42.113 – 10.2.42.11810.2.42.119
8010.2.42.120/2910.2.42.121 – 10.2.42.12610.2.42.127
8110.2.42.128/2910.2.42.129 – 10.2.42.13410.2.42.135
8210.2.42.136/2910.2.42.137 – 10.2.42.14210.2.42.143
8310.2.42.144/2910.2.42.145 – 10.2.42.15010.2.42.151
8410.2.42.152/2910.2.42.153 – 10.2.42.15810.2.42.159
8510.2.42.160/2910.2.42.161 – 10.2.42.16610.2.42.167
8610.2.42.168/2910.2.42.169 – 10.2.42.17410.2.42.175
8710.2.42.176/2910.2.42.177 – 10.2.42.18210.2.42.183
8810.2.42.184/2910.2.42.185 – 10.2.42.19010.2.42.191
8910.2.42.192/2910.2.42.193 – 10.2.42.19810.2.42.199
9010.2.42.200/2910.2.42.201 – 10.2.42.20610.2.42.207
9110.2.42.208/2910.2.42.209 – 10.2.42.21410.2.42.215
9210.2.42.216/2910.2.42.217 – 10.2.42.22210.2.42.223
9310.2.42.224/2910.2.42.225 – 10.2.42.23010.2.42.231
9410.2.42.232/2910.2.42.233 – 10.2.42.23810.2.42.239
9510.2.42.240/2910.2.42.241 – 10.2.42.24610.2.42.247
9610.2.42.248/2910.2.42.249 – 10.2.42.25410.2.42.255
9710.2.43.0/2910.2.43.1 – 10.2.43.610.2.43.7
9810.2.43.8/2910.2.43.9 – 10.2.43.1410.2.43.15
9910.2.43.16/2910.2.43.17 – 10.2.43.2210.2.43.23
10010.2.43.24/2910.2.43.25 – 10.2.43.3010.2.43.31
10110.2.43.32/2910.2.43.33 – 10.2.43.3810.2.43.39
10210.2.43.40/2910.2.43.41 – 10.2.43.4610.2.43.47
10310.2.43.48/2910.2.43.49 – 10.2.43.5410.2.43.55
10410.2.43.56/2910.2.43.57 – 10.2.43.6210.2.43.63
10510.2.43.64/2910.2.43.65 – 10.2.43.7010.2.43.71
10610.2.43.72/2910.2.43.73 – 10.2.43.7810.2.43.79
10710.2.43.80/2910.2.43.81 – 10.2.43.8610.2.43.87
10810.2.43.88/2910.2.43.89 – 10.2.43.9410.2.43.95
10910.2.43.96/2910.2.43.97 – 10.2.43.10210.2.43.103
11010.2.43.104/2910.2.43.105 – 10.2.43.11010.2.43.111
11110.2.43.112/2910.2.43.113 – 10.2.43.11810.2.43.119
11210.2.43.120/2910.2.43.121 – 10.2.43.12610.2.43.127
11310.2.43.128/2910.2.43.129 – 10.2.43.13410.2.43.135
11410.2.43.136/2910.2.43.137 – 10.2.43.14210.2.43.143
11510.2.43.144/2910.2.43.145 – 10.2.43.15010.2.43.151
11610.2.43.152/2910.2.43.153 – 10.2.43.15810.2.43.159
11710.2.43.160/2910.2.43.161 – 10.2.43.16610.2.43.167
11810.2.43.168/2910.2.43.169 – 10.2.43.17410.2.43.175
11910.2.43.176/2910.2.43.177 – 10.2.43.18210.2.43.183
12010.2.43.184/2910.2.43.185 – 10.2.43.19010.2.43.191
12110.2.43.192/2910.2.43.193 – 10.2.43.19810.2.43.199
12210.2.43.200/2910.2.43.201 – 10.2.43.20610.2.43.207
12310.2.43.208/2910.2.43.209 – 10.2.43.21410.2.43.215
12410.2.43.216/2910.2.43.217 – 10.2.43.22210.2.43.223
12510.2.43.224/2910.2.43.225 – 10.2.43.23010.2.43.231
12610.2.43.232/2910.2.43.233 – 10.2.43.23810.2.43.239
12710.2.43.240/2910.2.43.241 – 10.2.43.24610.2.43.247
12810.2.43.248/2910.2.43.249 – 10.2.43.25410.2.43.255
12910.2.44.0/2910.2.44.1 – 10.2.44.610.2.44.7
13010.2.44.8/2910.2.44.9 – 10.2.44.1410.2.44.15
13110.2.44.16/2910.2.44.17 – 10.2.44.2210.2.44.23
13210.2.44.24/2910.2.44.25 – 10.2.44.3010.2.44.31
13310.2.44.32/2910.2.44.33 – 10.2.44.3810.2.44.39
13410.2.44.40/2910.2.44.41 – 10.2.44.4610.2.44.47
13510.2.44.48/2910.2.44.49 – 10.2.44.5410.2.44.55
13610.2.44.56/2910.2.44.57 – 10.2.44.6210.2.44.63
13710.2.44.64/2910.2.44.65 – 10.2.44.7010.2.44.71
13810.2.44.72/2910.2.44.73 – 10.2.44.7810.2.44.79
13910.2.44.80/2910.2.44.81 – 10.2.44.8610.2.44.87
14010.2.44.88/2910.2.44.89 – 10.2.44.9410.2.44.95
14110.2.44.96/2910.2.44.97 – 10.2.44.10210.2.44.103
14210.2.44.104/2910.2.44.105 – 10.2.44.11010.2.44.111
14310.2.44.112/2910.2.44.113 – 10.2.44.11810.2.44.119
14410.2.44.120/2910.2.44.121 – 10.2.44.12610.2.44.127
14510.2.44.128/2910.2.44.129 – 10.2.44.13410.2.44.135
14610.2.44.136/2910.2.44.137 – 10.2.44.14210.2.44.143
14710.2.44.144/2910.2.44.145 – 10.2.44.15010.2.44.151
14810.2.44.152/2910.2.44.153 – 10.2.44.15810.2.44.159
14910.2.44.160/2910.2.44.161 – 10.2.44.16610.2.44.167
15010.2.44.168/2910.2.44.169 – 10.2.44.17410.2.44.175
15110.2.44.176/2910.2.44.177 – 10.2.44.18210.2.44.183
15210.2.44.184/2910.2.44.185 – 10.2.44.19010.2.44.191
15310.2.44.192/2910.2.44.193 – 10.2.44.19810.2.44.199
15410.2.44.200/2910.2.44.201 – 10.2.44.20610.2.44.207
15510.2.44.208/2910.2.44.209 – 10.2.44.21410.2.44.215
15610.2.44.216/2910.2.44.217 – 10.2.44.22210.2.44.223
15710.2.44.224/2910.2.44.225 – 10.2.44.23010.2.44.231
15810.2.44.232/2910.2.44.233 – 10.2.44.23810.2.44.239
15910.2.44.240/2910.2.44.241 – 10.2.44.24610.2.44.247
16010.2.44.248/2910.2.44.249 – 10.2.44.25410.2.44.255
16110.2.45.0/2910.2.45.1 – 10.2.45.610.2.45.7
16210.2.45.8/2910.2.45.9 – 10.2.45.1410.2.45.15
16310.2.45.16/2910.2.45.17 – 10.2.45.2210.2.45.23
16410.2.45.24/2910.2.45.25 – 10.2.45.3010.2.45.31
16510.2.45.32/2910.2.45.33 – 10.2.45.3810.2.45.39
16610.2.45.40/2910.2.45.41 – 10.2.45.4610.2.45.47
16710.2.45.48/2910.2.45.49 – 10.2.45.5410.2.45.55
16810.2.45.56/2910.2.45.57 – 10.2.45.6210.2.45.63
16910.2.45.64/2910.2.45.65 – 10.2.45.7010.2.45.71
17010.2.45.72/2910.2.45.73 – 10.2.45.7810.2.45.79
17110.2.45.80/2910.2.45.81 – 10.2.45.8610.2.45.87
17210.2.45.88/2910.2.45.89 – 10.2.45.9410.2.45.95
17310.2.45.96/2910.2.45.97 – 10.2.45.10210.2.45.103
17410.2.45.104/2910.2.45.105 – 10.2.45.11010.2.45.111
17510.2.45.112/2910.2.45.113 – 10.2.45.11810.2.45.119
17610.2.45.120/2910.2.45.121 – 10.2.45.12610.2.45.127
17710.2.45.128/2910.2.45.129 – 10.2.45.13410.2.45.135
17810.2.45.136/2910.2.45.137 – 10.2.45.14210.2.45.143
17910.2.45.144/2910.2.45.145 – 10.2.45.15010.2.45.151
18010.2.45.152/2910.2.45.153 – 10.2.45.15810.2.45.159
18110.2.45.160/2910.2.45.161 – 10.2.45.16610.2.45.167
18210.2.45.168/2910.2.45.169 – 10.2.45.17410.2.45.175
18310.2.45.176/2910.2.45.177 – 10.2.45.18210.2.45.183
18410.2.45.184/2910.2.45.185 – 10.2.45.19010.2.45.191
18510.2.45.192/2910.2.45.193 – 10.2.45.19810.2.45.199
18610.2.45.200/2910.2.45.201 – 10.2.45.20610.2.45.207
18710.2.45.208/2910.2.45.209 – 10.2.45.21410.2.45.215
18810.2.45.216/2910.2.45.217 – 10.2.45.22210.2.45.223
18910.2.45.224/2910.2.45.225 – 10.2.45.23010.2.45.231
19010.2.45.232/2910.2.45.233 – 10.2.45.23810.2.45.239
19110.2.45.240/2910.2.45.241 – 10.2.45.24610.2.45.247
19210.2.45.248/2910.2.45.249 – 10.2.45.25410.2.45.255
19310.2.46.0/2910.2.46.1 – 10.2.46.610.2.46.7
19410.2.46.8/2910.2.46.9 – 10.2.46.1410.2.46.15
19510.2.46.16/2910.2.46.17 – 10.2.46.2210.2.46.23
19610.2.46.24/2910.2.46.25 – 10.2.46.3010.2.46.31
19710.2.46.32/2910.2.46.33 – 10.2.46.3810.2.46.39
19810.2.46.40/2910.2.46.41 – 10.2.46.4610.2.46.47
19910.2.46.48/2910.2.46.49 – 10.2.46.5410.2.46.55
20010.2.46.56/2910.2.46.57 – 10.2.46.6210.2.46.63
20110.2.46.64/2910.2.46.65 – 10.2.46.7010.2.46.71
20210.2.46.72/2910.2.46.73 – 10.2.46.7810.2.46.79
20310.2.46.80/2910.2.46.81 – 10.2.46.8610.2.46.87
20410.2.46.88/2910.2.46.89 – 10.2.46.9410.2.46.95
20510.2.46.96/2910.2.46.97 – 10.2.46.10210.2.46.103
20610.2.46.104/2910.2.46.105 – 10.2.46.11010.2.46.111
20710.2.46.112/2910.2.46.113 – 10.2.46.11810.2.46.119
20810.2.46.120/2910.2.46.121 – 10.2.46.12610.2.46.127
20910.2.46.128/2910.2.46.129 – 10.2.46.13410.2.46.135
21010.2.46.136/2910.2.46.137 – 10.2.46.14210.2.46.143
21110.2.46.144/2910.2.46.145 – 10.2.46.15010.2.46.151
21210.2.46.152/2910.2.46.153 – 10.2.46.15810.2.46.159
21310.2.46.160/2910.2.46.161 – 10.2.46.16610.2.46.167
21410.2.46.168/2910.2.46.169 – 10.2.46.17410.2.46.175
21510.2.46.176/2910.2.46.177 – 10.2.46.18210.2.46.183
21610.2.46.184/2910.2.46.185 – 10.2.46.19010.2.46.191
21710.2.46.192/2910.2.46.193 – 10.2.46.19810.2.46.199
21810.2.46.200/2910.2.46.201 – 10.2.46.20610.2.46.207
21910.2.46.208/2910.2.46.209 – 10.2.46.21410.2.46.215
22010.2.46.216/2910.2.46.217 – 10.2.46.22210.2.46.223
22110.2.46.224/2910.2.46.225 – 10.2.46.23010.2.46.231
22210.2.46.232/2910.2.46.233 – 10.2.46.23810.2.46.239
22310.2.46.240/2910.2.46.241 – 10.2.46.24610.2.46.247
22410.2.46.248/2910.2.46.249 – 10.2.46.25410.2.46.255
22510.2.47.0/2910.2.47.1 – 10.2.47.610.2.47.7
22610.2.47.8/2910.2.47.9 – 10.2.47.1410.2.47.15
22710.2.47.16/2910.2.47.17 – 10.2.47.2210.2.47.23
22810.2.47.24/2910.2.47.25 – 10.2.47.3010.2.47.31
22910.2.47.32/2910.2.47.33 – 10.2.47.3810.2.47.39
23010.2.47.40/2910.2.47.41 – 10.2.47.4610.2.47.47
23110.2.47.48/2910.2.47.49 – 10.2.47.5410.2.47.55
23210.2.47.56/2910.2.47.57 – 10.2.47.6210.2.47.63
23310.2.47.64/2910.2.47.65 – 10.2.47.7010.2.47.71
23410.2.47.72/2910.2.47.73 – 10.2.47.7810.2.47.79
23510.2.47.80/2910.2.47.81 – 10.2.47.8610.2.47.87
23610.2.47.88/2910.2.47.89 – 10.2.47.9410.2.47.95
23710.2.47.96/2910.2.47.97 – 10.2.47.10210.2.47.103
23810.2.47.104/2910.2.47.105 – 10.2.47.11010.2.47.111
23910.2.47.112/2910.2.47.113 – 10.2.47.11810.2.47.119
24010.2.47.120/2910.2.47.121 – 10.2.47.12610.2.47.127
24110.2.47.128/2910.2.47.129 – 10.2.47.13410.2.47.135
24210.2.47.136/2910.2.47.137 – 10.2.47.14210.2.47.143
24310.2.47.144/2910.2.47.145 – 10.2.47.15010.2.47.151
24410.2.47.152/2910.2.47.153 – 10.2.47.15810.2.47.159
24510.2.47.160/2910.2.47.161 – 10.2.47.16610.2.47.167
24610.2.47.168/2910.2.47.169 – 10.2.47.17410.2.47.175
24710.2.47.176/2910.2.47.177 – 10.2.47.18210.2.47.183
24810.2.47.184/2910.2.47.185 – 10.2.47.19010.2.47.191
24910.2.47.192/2910.2.47.193 – 10.2.47.19810.2.47.199
25010.2.47.200/2910.2.47.201 – 10.2.47.20610.2.47.207
25110.2.47.208/2910.2.47.209 – 10.2.47.21410.2.47.215
25210.2.47.216/2910.2.47.217 – 10.2.47.22210.2.47.223
25310.2.47.224/2910.2.47.225 – 10.2.47.23010.2.47.231
25410.2.47.232/2910.2.47.233 – 10.2.47.23810.2.47.239
25510.2.47.240/2910.2.47.241 – 10.2.47.24610.2.47.247
25610.2.47.248/2910.2.47.249 – 10.2.47.25410.2.47.255
01 / table

IPv4 CIDR prefix table.

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

prefixsubnet maskaddresseshostsin your /21
/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-
/21255.255.248.02,0482,0461
/22255.255.252.01,0241,0222 split →
/23255.255.254.05125104 split →
/24255.255.255.02562548 split →
/25255.255.255.12812812616 split →
/26255.255.255.192646232 split →
/27255.255.255.224323064 split →
/28255.255.255.2401614128 split →
/29255.255.255.24886256 split →
/30255.255.255.25242512 split →
/31255.255.255.254221,024 split →
/32255.255.255.255112,048 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 →