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
private IP (RFC 1918)10.3.8.0/23
network10.3.8.0/23
broadcast10.3.9.255
first host10.3.8.1
last host10.3.9.254
subnet mask255.255.254.0
wildcard0.0.1.255
addresses512
usable hosts510
classA
ipcalc 10.3.8.0/23
address00001010.00000011.00001000.00000000
subnet mask11111111.11111111.11111110.00000000
network00001010.00000011.00001000.00000000
broadcast00001010.00000011.00001001.11111111
green = network part, grey = host part
hex0x0a030800
decimal167970816
reverse dns0.8.3.10.in-addr.arpa
ipv4-mapped::ffff:a03:800

/23 split into /31 · 256 subnets

close ×
#networkhost rangebroadcast
110.3.8.0/3110.3.8.0 – 10.3.8.110.3.8.1
210.3.8.2/3110.3.8.2 – 10.3.8.310.3.8.3
310.3.8.4/3110.3.8.4 – 10.3.8.510.3.8.5
410.3.8.6/3110.3.8.6 – 10.3.8.710.3.8.7
510.3.8.8/3110.3.8.8 – 10.3.8.910.3.8.9
610.3.8.10/3110.3.8.10 – 10.3.8.1110.3.8.11
710.3.8.12/3110.3.8.12 – 10.3.8.1310.3.8.13
810.3.8.14/3110.3.8.14 – 10.3.8.1510.3.8.15
910.3.8.16/3110.3.8.16 – 10.3.8.1710.3.8.17
1010.3.8.18/3110.3.8.18 – 10.3.8.1910.3.8.19
1110.3.8.20/3110.3.8.20 – 10.3.8.2110.3.8.21
1210.3.8.22/3110.3.8.22 – 10.3.8.2310.3.8.23
1310.3.8.24/3110.3.8.24 – 10.3.8.2510.3.8.25
1410.3.8.26/3110.3.8.26 – 10.3.8.2710.3.8.27
1510.3.8.28/3110.3.8.28 – 10.3.8.2910.3.8.29
1610.3.8.30/3110.3.8.30 – 10.3.8.3110.3.8.31
1710.3.8.32/3110.3.8.32 – 10.3.8.3310.3.8.33
1810.3.8.34/3110.3.8.34 – 10.3.8.3510.3.8.35
1910.3.8.36/3110.3.8.36 – 10.3.8.3710.3.8.37
2010.3.8.38/3110.3.8.38 – 10.3.8.3910.3.8.39
2110.3.8.40/3110.3.8.40 – 10.3.8.4110.3.8.41
2210.3.8.42/3110.3.8.42 – 10.3.8.4310.3.8.43
2310.3.8.44/3110.3.8.44 – 10.3.8.4510.3.8.45
2410.3.8.46/3110.3.8.46 – 10.3.8.4710.3.8.47
2510.3.8.48/3110.3.8.48 – 10.3.8.4910.3.8.49
2610.3.8.50/3110.3.8.50 – 10.3.8.5110.3.8.51
2710.3.8.52/3110.3.8.52 – 10.3.8.5310.3.8.53
2810.3.8.54/3110.3.8.54 – 10.3.8.5510.3.8.55
2910.3.8.56/3110.3.8.56 – 10.3.8.5710.3.8.57
3010.3.8.58/3110.3.8.58 – 10.3.8.5910.3.8.59
3110.3.8.60/3110.3.8.60 – 10.3.8.6110.3.8.61
3210.3.8.62/3110.3.8.62 – 10.3.8.6310.3.8.63
3310.3.8.64/3110.3.8.64 – 10.3.8.6510.3.8.65
3410.3.8.66/3110.3.8.66 – 10.3.8.6710.3.8.67
3510.3.8.68/3110.3.8.68 – 10.3.8.6910.3.8.69
3610.3.8.70/3110.3.8.70 – 10.3.8.7110.3.8.71
3710.3.8.72/3110.3.8.72 – 10.3.8.7310.3.8.73
3810.3.8.74/3110.3.8.74 – 10.3.8.7510.3.8.75
3910.3.8.76/3110.3.8.76 – 10.3.8.7710.3.8.77
4010.3.8.78/3110.3.8.78 – 10.3.8.7910.3.8.79
4110.3.8.80/3110.3.8.80 – 10.3.8.8110.3.8.81
4210.3.8.82/3110.3.8.82 – 10.3.8.8310.3.8.83
4310.3.8.84/3110.3.8.84 – 10.3.8.8510.3.8.85
4410.3.8.86/3110.3.8.86 – 10.3.8.8710.3.8.87
4510.3.8.88/3110.3.8.88 – 10.3.8.8910.3.8.89
4610.3.8.90/3110.3.8.90 – 10.3.8.9110.3.8.91
4710.3.8.92/3110.3.8.92 – 10.3.8.9310.3.8.93
4810.3.8.94/3110.3.8.94 – 10.3.8.9510.3.8.95
4910.3.8.96/3110.3.8.96 – 10.3.8.9710.3.8.97
5010.3.8.98/3110.3.8.98 – 10.3.8.9910.3.8.99
5110.3.8.100/3110.3.8.100 – 10.3.8.10110.3.8.101
5210.3.8.102/3110.3.8.102 – 10.3.8.10310.3.8.103
5310.3.8.104/3110.3.8.104 – 10.3.8.10510.3.8.105
5410.3.8.106/3110.3.8.106 – 10.3.8.10710.3.8.107
5510.3.8.108/3110.3.8.108 – 10.3.8.10910.3.8.109
5610.3.8.110/3110.3.8.110 – 10.3.8.11110.3.8.111
5710.3.8.112/3110.3.8.112 – 10.3.8.11310.3.8.113
5810.3.8.114/3110.3.8.114 – 10.3.8.11510.3.8.115
5910.3.8.116/3110.3.8.116 – 10.3.8.11710.3.8.117
6010.3.8.118/3110.3.8.118 – 10.3.8.11910.3.8.119
6110.3.8.120/3110.3.8.120 – 10.3.8.12110.3.8.121
6210.3.8.122/3110.3.8.122 – 10.3.8.12310.3.8.123
6310.3.8.124/3110.3.8.124 – 10.3.8.12510.3.8.125
6410.3.8.126/3110.3.8.126 – 10.3.8.12710.3.8.127
6510.3.8.128/3110.3.8.128 – 10.3.8.12910.3.8.129
6610.3.8.130/3110.3.8.130 – 10.3.8.13110.3.8.131
6710.3.8.132/3110.3.8.132 – 10.3.8.13310.3.8.133
6810.3.8.134/3110.3.8.134 – 10.3.8.13510.3.8.135
6910.3.8.136/3110.3.8.136 – 10.3.8.13710.3.8.137
7010.3.8.138/3110.3.8.138 – 10.3.8.13910.3.8.139
7110.3.8.140/3110.3.8.140 – 10.3.8.14110.3.8.141
7210.3.8.142/3110.3.8.142 – 10.3.8.14310.3.8.143
7310.3.8.144/3110.3.8.144 – 10.3.8.14510.3.8.145
7410.3.8.146/3110.3.8.146 – 10.3.8.14710.3.8.147
7510.3.8.148/3110.3.8.148 – 10.3.8.14910.3.8.149
7610.3.8.150/3110.3.8.150 – 10.3.8.15110.3.8.151
7710.3.8.152/3110.3.8.152 – 10.3.8.15310.3.8.153
7810.3.8.154/3110.3.8.154 – 10.3.8.15510.3.8.155
7910.3.8.156/3110.3.8.156 – 10.3.8.15710.3.8.157
8010.3.8.158/3110.3.8.158 – 10.3.8.15910.3.8.159
8110.3.8.160/3110.3.8.160 – 10.3.8.16110.3.8.161
8210.3.8.162/3110.3.8.162 – 10.3.8.16310.3.8.163
8310.3.8.164/3110.3.8.164 – 10.3.8.16510.3.8.165
8410.3.8.166/3110.3.8.166 – 10.3.8.16710.3.8.167
8510.3.8.168/3110.3.8.168 – 10.3.8.16910.3.8.169
8610.3.8.170/3110.3.8.170 – 10.3.8.17110.3.8.171
8710.3.8.172/3110.3.8.172 – 10.3.8.17310.3.8.173
8810.3.8.174/3110.3.8.174 – 10.3.8.17510.3.8.175
8910.3.8.176/3110.3.8.176 – 10.3.8.17710.3.8.177
9010.3.8.178/3110.3.8.178 – 10.3.8.17910.3.8.179
9110.3.8.180/3110.3.8.180 – 10.3.8.18110.3.8.181
9210.3.8.182/3110.3.8.182 – 10.3.8.18310.3.8.183
9310.3.8.184/3110.3.8.184 – 10.3.8.18510.3.8.185
9410.3.8.186/3110.3.8.186 – 10.3.8.18710.3.8.187
9510.3.8.188/3110.3.8.188 – 10.3.8.18910.3.8.189
9610.3.8.190/3110.3.8.190 – 10.3.8.19110.3.8.191
9710.3.8.192/3110.3.8.192 – 10.3.8.19310.3.8.193
9810.3.8.194/3110.3.8.194 – 10.3.8.19510.3.8.195
9910.3.8.196/3110.3.8.196 – 10.3.8.19710.3.8.197
10010.3.8.198/3110.3.8.198 – 10.3.8.19910.3.8.199
10110.3.8.200/3110.3.8.200 – 10.3.8.20110.3.8.201
10210.3.8.202/3110.3.8.202 – 10.3.8.20310.3.8.203
10310.3.8.204/3110.3.8.204 – 10.3.8.20510.3.8.205
10410.3.8.206/3110.3.8.206 – 10.3.8.20710.3.8.207
10510.3.8.208/3110.3.8.208 – 10.3.8.20910.3.8.209
10610.3.8.210/3110.3.8.210 – 10.3.8.21110.3.8.211
10710.3.8.212/3110.3.8.212 – 10.3.8.21310.3.8.213
10810.3.8.214/3110.3.8.214 – 10.3.8.21510.3.8.215
10910.3.8.216/3110.3.8.216 – 10.3.8.21710.3.8.217
11010.3.8.218/3110.3.8.218 – 10.3.8.21910.3.8.219
11110.3.8.220/3110.3.8.220 – 10.3.8.22110.3.8.221
11210.3.8.222/3110.3.8.222 – 10.3.8.22310.3.8.223
11310.3.8.224/3110.3.8.224 – 10.3.8.22510.3.8.225
11410.3.8.226/3110.3.8.226 – 10.3.8.22710.3.8.227
11510.3.8.228/3110.3.8.228 – 10.3.8.22910.3.8.229
11610.3.8.230/3110.3.8.230 – 10.3.8.23110.3.8.231
11710.3.8.232/3110.3.8.232 – 10.3.8.23310.3.8.233
11810.3.8.234/3110.3.8.234 – 10.3.8.23510.3.8.235
11910.3.8.236/3110.3.8.236 – 10.3.8.23710.3.8.237
12010.3.8.238/3110.3.8.238 – 10.3.8.23910.3.8.239
12110.3.8.240/3110.3.8.240 – 10.3.8.24110.3.8.241
12210.3.8.242/3110.3.8.242 – 10.3.8.24310.3.8.243
12310.3.8.244/3110.3.8.244 – 10.3.8.24510.3.8.245
12410.3.8.246/3110.3.8.246 – 10.3.8.24710.3.8.247
12510.3.8.248/3110.3.8.248 – 10.3.8.24910.3.8.249
12610.3.8.250/3110.3.8.250 – 10.3.8.25110.3.8.251
12710.3.8.252/3110.3.8.252 – 10.3.8.25310.3.8.253
12810.3.8.254/3110.3.8.254 – 10.3.8.25510.3.8.255
12910.3.9.0/3110.3.9.0 – 10.3.9.110.3.9.1
13010.3.9.2/3110.3.9.2 – 10.3.9.310.3.9.3
13110.3.9.4/3110.3.9.4 – 10.3.9.510.3.9.5
13210.3.9.6/3110.3.9.6 – 10.3.9.710.3.9.7
13310.3.9.8/3110.3.9.8 – 10.3.9.910.3.9.9
13410.3.9.10/3110.3.9.10 – 10.3.9.1110.3.9.11
13510.3.9.12/3110.3.9.12 – 10.3.9.1310.3.9.13
13610.3.9.14/3110.3.9.14 – 10.3.9.1510.3.9.15
13710.3.9.16/3110.3.9.16 – 10.3.9.1710.3.9.17
13810.3.9.18/3110.3.9.18 – 10.3.9.1910.3.9.19
13910.3.9.20/3110.3.9.20 – 10.3.9.2110.3.9.21
14010.3.9.22/3110.3.9.22 – 10.3.9.2310.3.9.23
14110.3.9.24/3110.3.9.24 – 10.3.9.2510.3.9.25
14210.3.9.26/3110.3.9.26 – 10.3.9.2710.3.9.27
14310.3.9.28/3110.3.9.28 – 10.3.9.2910.3.9.29
14410.3.9.30/3110.3.9.30 – 10.3.9.3110.3.9.31
14510.3.9.32/3110.3.9.32 – 10.3.9.3310.3.9.33
14610.3.9.34/3110.3.9.34 – 10.3.9.3510.3.9.35
14710.3.9.36/3110.3.9.36 – 10.3.9.3710.3.9.37
14810.3.9.38/3110.3.9.38 – 10.3.9.3910.3.9.39
14910.3.9.40/3110.3.9.40 – 10.3.9.4110.3.9.41
15010.3.9.42/3110.3.9.42 – 10.3.9.4310.3.9.43
15110.3.9.44/3110.3.9.44 – 10.3.9.4510.3.9.45
15210.3.9.46/3110.3.9.46 – 10.3.9.4710.3.9.47
15310.3.9.48/3110.3.9.48 – 10.3.9.4910.3.9.49
15410.3.9.50/3110.3.9.50 – 10.3.9.5110.3.9.51
15510.3.9.52/3110.3.9.52 – 10.3.9.5310.3.9.53
15610.3.9.54/3110.3.9.54 – 10.3.9.5510.3.9.55
15710.3.9.56/3110.3.9.56 – 10.3.9.5710.3.9.57
15810.3.9.58/3110.3.9.58 – 10.3.9.5910.3.9.59
15910.3.9.60/3110.3.9.60 – 10.3.9.6110.3.9.61
16010.3.9.62/3110.3.9.62 – 10.3.9.6310.3.9.63
16110.3.9.64/3110.3.9.64 – 10.3.9.6510.3.9.65
16210.3.9.66/3110.3.9.66 – 10.3.9.6710.3.9.67
16310.3.9.68/3110.3.9.68 – 10.3.9.6910.3.9.69
16410.3.9.70/3110.3.9.70 – 10.3.9.7110.3.9.71
16510.3.9.72/3110.3.9.72 – 10.3.9.7310.3.9.73
16610.3.9.74/3110.3.9.74 – 10.3.9.7510.3.9.75
16710.3.9.76/3110.3.9.76 – 10.3.9.7710.3.9.77
16810.3.9.78/3110.3.9.78 – 10.3.9.7910.3.9.79
16910.3.9.80/3110.3.9.80 – 10.3.9.8110.3.9.81
17010.3.9.82/3110.3.9.82 – 10.3.9.8310.3.9.83
17110.3.9.84/3110.3.9.84 – 10.3.9.8510.3.9.85
17210.3.9.86/3110.3.9.86 – 10.3.9.8710.3.9.87
17310.3.9.88/3110.3.9.88 – 10.3.9.8910.3.9.89
17410.3.9.90/3110.3.9.90 – 10.3.9.9110.3.9.91
17510.3.9.92/3110.3.9.92 – 10.3.9.9310.3.9.93
17610.3.9.94/3110.3.9.94 – 10.3.9.9510.3.9.95
17710.3.9.96/3110.3.9.96 – 10.3.9.9710.3.9.97
17810.3.9.98/3110.3.9.98 – 10.3.9.9910.3.9.99
17910.3.9.100/3110.3.9.100 – 10.3.9.10110.3.9.101
18010.3.9.102/3110.3.9.102 – 10.3.9.10310.3.9.103
18110.3.9.104/3110.3.9.104 – 10.3.9.10510.3.9.105
18210.3.9.106/3110.3.9.106 – 10.3.9.10710.3.9.107
18310.3.9.108/3110.3.9.108 – 10.3.9.10910.3.9.109
18410.3.9.110/3110.3.9.110 – 10.3.9.11110.3.9.111
18510.3.9.112/3110.3.9.112 – 10.3.9.11310.3.9.113
18610.3.9.114/3110.3.9.114 – 10.3.9.11510.3.9.115
18710.3.9.116/3110.3.9.116 – 10.3.9.11710.3.9.117
18810.3.9.118/3110.3.9.118 – 10.3.9.11910.3.9.119
18910.3.9.120/3110.3.9.120 – 10.3.9.12110.3.9.121
19010.3.9.122/3110.3.9.122 – 10.3.9.12310.3.9.123
19110.3.9.124/3110.3.9.124 – 10.3.9.12510.3.9.125
19210.3.9.126/3110.3.9.126 – 10.3.9.12710.3.9.127
19310.3.9.128/3110.3.9.128 – 10.3.9.12910.3.9.129
19410.3.9.130/3110.3.9.130 – 10.3.9.13110.3.9.131
19510.3.9.132/3110.3.9.132 – 10.3.9.13310.3.9.133
19610.3.9.134/3110.3.9.134 – 10.3.9.13510.3.9.135
19710.3.9.136/3110.3.9.136 – 10.3.9.13710.3.9.137
19810.3.9.138/3110.3.9.138 – 10.3.9.13910.3.9.139
19910.3.9.140/3110.3.9.140 – 10.3.9.14110.3.9.141
20010.3.9.142/3110.3.9.142 – 10.3.9.14310.3.9.143
20110.3.9.144/3110.3.9.144 – 10.3.9.14510.3.9.145
20210.3.9.146/3110.3.9.146 – 10.3.9.14710.3.9.147
20310.3.9.148/3110.3.9.148 – 10.3.9.14910.3.9.149
20410.3.9.150/3110.3.9.150 – 10.3.9.15110.3.9.151
20510.3.9.152/3110.3.9.152 – 10.3.9.15310.3.9.153
20610.3.9.154/3110.3.9.154 – 10.3.9.15510.3.9.155
20710.3.9.156/3110.3.9.156 – 10.3.9.15710.3.9.157
20810.3.9.158/3110.3.9.158 – 10.3.9.15910.3.9.159
20910.3.9.160/3110.3.9.160 – 10.3.9.16110.3.9.161
21010.3.9.162/3110.3.9.162 – 10.3.9.16310.3.9.163
21110.3.9.164/3110.3.9.164 – 10.3.9.16510.3.9.165
21210.3.9.166/3110.3.9.166 – 10.3.9.16710.3.9.167
21310.3.9.168/3110.3.9.168 – 10.3.9.16910.3.9.169
21410.3.9.170/3110.3.9.170 – 10.3.9.17110.3.9.171
21510.3.9.172/3110.3.9.172 – 10.3.9.17310.3.9.173
21610.3.9.174/3110.3.9.174 – 10.3.9.17510.3.9.175
21710.3.9.176/3110.3.9.176 – 10.3.9.17710.3.9.177
21810.3.9.178/3110.3.9.178 – 10.3.9.17910.3.9.179
21910.3.9.180/3110.3.9.180 – 10.3.9.18110.3.9.181
22010.3.9.182/3110.3.9.182 – 10.3.9.18310.3.9.183
22110.3.9.184/3110.3.9.184 – 10.3.9.18510.3.9.185
22210.3.9.186/3110.3.9.186 – 10.3.9.18710.3.9.187
22310.3.9.188/3110.3.9.188 – 10.3.9.18910.3.9.189
22410.3.9.190/3110.3.9.190 – 10.3.9.19110.3.9.191
22510.3.9.192/3110.3.9.192 – 10.3.9.19310.3.9.193
22610.3.9.194/3110.3.9.194 – 10.3.9.19510.3.9.195
22710.3.9.196/3110.3.9.196 – 10.3.9.19710.3.9.197
22810.3.9.198/3110.3.9.198 – 10.3.9.19910.3.9.199
22910.3.9.200/3110.3.9.200 – 10.3.9.20110.3.9.201
23010.3.9.202/3110.3.9.202 – 10.3.9.20310.3.9.203
23110.3.9.204/3110.3.9.204 – 10.3.9.20510.3.9.205
23210.3.9.206/3110.3.9.206 – 10.3.9.20710.3.9.207
23310.3.9.208/3110.3.9.208 – 10.3.9.20910.3.9.209
23410.3.9.210/3110.3.9.210 – 10.3.9.21110.3.9.211
23510.3.9.212/3110.3.9.212 – 10.3.9.21310.3.9.213
23610.3.9.214/3110.3.9.214 – 10.3.9.21510.3.9.215
23710.3.9.216/3110.3.9.216 – 10.3.9.21710.3.9.217
23810.3.9.218/3110.3.9.218 – 10.3.9.21910.3.9.219
23910.3.9.220/3110.3.9.220 – 10.3.9.22110.3.9.221
24010.3.9.222/3110.3.9.222 – 10.3.9.22310.3.9.223
24110.3.9.224/3110.3.9.224 – 10.3.9.22510.3.9.225
24210.3.9.226/3110.3.9.226 – 10.3.9.22710.3.9.227
24310.3.9.228/3110.3.9.228 – 10.3.9.22910.3.9.229
24410.3.9.230/3110.3.9.230 – 10.3.9.23110.3.9.231
24510.3.9.232/3110.3.9.232 – 10.3.9.23310.3.9.233
24610.3.9.234/3110.3.9.234 – 10.3.9.23510.3.9.235
24710.3.9.236/3110.3.9.236 – 10.3.9.23710.3.9.237
24810.3.9.238/3110.3.9.238 – 10.3.9.23910.3.9.239
24910.3.9.240/3110.3.9.240 – 10.3.9.24110.3.9.241
25010.3.9.242/3110.3.9.242 – 10.3.9.24310.3.9.243
25110.3.9.244/3110.3.9.244 – 10.3.9.24510.3.9.245
25210.3.9.246/3110.3.9.246 – 10.3.9.24710.3.9.247
25310.3.9.248/3110.3.9.248 – 10.3.9.24910.3.9.249
25410.3.9.250/3110.3.9.250 – 10.3.9.25110.3.9.251
25510.3.9.252/3110.3.9.252 – 10.3.9.25310.3.9.253
25610.3.9.254/3110.3.9.254 – 10.3.9.25510.3.9.255
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 →