Dalam menghitung subnetting jaringan, selain menggunakan metode kotak seperti yang dijelaskan sebelumnya, terdapat metode lain yang tak kalah sederhana dalam penyajiannya yaitu metode lingkaran (circle method). Adapun menghitung subnetting jaringan dengan metode lingkaran adalah dengan cara memvisualisasikan rincian dari setiap subnet/kelas/kelompok dan alamat/host ke dalam jaringan yang lebih kecil.
Setiap bagian dari subnet dalam lingkaran tersebut terdapat angka yang menunjukkan alamat jaringan (network Id) dan alamat broadcast (broadcast Id), sehingga untuk rentang IP yang tersedia adalah antara alamat Network Id dan Broadcast Id tersebut. Angka yang paling rendah dalam subnet tersebut merupakan Network Id sedangkan angka yang paling tinggi merupakan Broadcast Id.
Baca juga, Cara mudah memahami subnetting jaringan dengan metode kotak (box method)
Mari kita simak penjelasan singkat cara menghitung subnetting jaringan dengan metode lingkaran (Circle Method), dimulai dari 1 subnet yang diwakili oleh 1 lingkaran dengan jumlah host 256 (.0 s.d .255), seperti yang ditunjukkan pada gambar berikut ini.
#1 Subnet Mask 255.255.255.0
Keterangan :- Total subnet : 1 subnet
- Total host : 256 host
- Host valid : 254 host valid
Contoh untuk alamat IP 192.168.1.0/24
| Jumlah Subnet | Subnet Mask | Net Id | IP host awal | IP host akhir | Broadcast Id |
| 1 | 255.255.255.0 | 192.168.1.0 | 192.168.1.1 | 192.168.1.254 | 192.168.1.255 |
#2 Subnet Mask 255.255.255.128
Keterangan :- Total subnet : 2 subnet
- Total host : 128 host
- Host valid : 126 host valid
Contoh untuk alamat IP 192.168.1.0/25
| Jumlah Subnet | Subnet Mask | Net Id | IP host awal | IP host akhir | Broadcast Id |
| 1 | 255.255.255.128 | 192.168.1.0 | 192.168.1.1 | 192.168.1.126 | 192.168.1.127 |
| 2 | 255.255.255.128 | 192.168.1.128 | 192.168.1.1129 | 192.168.1.254 | 192.168.1.255 |
#3 Subnet Mask 255.255.255.192
Keterangan :- Total subnet : 4 subnet
- Total host : 64 host
- Host valid : 62 host valid
Contoh untuk alamat IP 192.168.1.0/26
| Jumlah Subnet | Subnet Mask | Net Id | IP host awal | IP host akhir | Broadcast Id |
| 1 | 255.255.255.192 | 192.168.1.0 | 192.168.1.1 | 192.168.1.62 | 192.168.1.63 |
| 2 | 255.255.255.192 | 192.168.1.64 | 192.168.1.65 | 192.168.1.126 | 192.168.1.127 |
| 3 | 255.255.255.192 | 192.168.1.128 | 192.168.1.129 | 192.168.1.190 | 192.168.1.191 |
| 4 | 255.255.255.192 | 192.168.1.192 | 192.168.1.193 | 192.168.1.254 | 192.168.1.255 |
#4 Subnet Mask 255.255.255.224
Keterangan : - Total subnet : 8 subnet
- Total host : 32 host
- Host valid : 30 host valid
Contoh untuk alamat IP 192.168.1.0/27
| Jumlah Subnet | Subnet Mask | Net Id | IP host awal | IP host akhir | Broadcast Id |
| 1 | 255.255.255.224 | 192.168.1.0 | 192.168.1.1 | 192.168.1.30 | 192.168.1.31 |
| 2 | 255.255.255.224 | 192.168.1.32 | 192.168.1.33 | 192.168.1.62 | 192.168.1.63 |
| 3 | 255.255.255.224 | 192.168.1.64 | 192.168.1.65 | 192.168.1.94 | 192.168.1.95 |
| 4 | 255.255.255.224 | 192.168.1.96 | 192.168.1.97 | 192.168.1.126 | 192.168.1.127 |
| 5 | 255.255.255.224 | 192.168.1.128 | 192.168.1.129 | 192.168.1.158 | 192.168.1.159 |
| 6 | 255.255.255.224 | 192.168.1.160 | 192.168.1.161 | 192.168.1.190 | 192.168.1.191 |
| 7 | 255.255.255.224 | 192.168.1.192 | 192.168.1.193 | 192.168.1.222 | 192.168.1.223 |
| 8 | 255.255.255.224 | 192.168.1.224 | 192.168.1.225 | 192.168.1.254 | 192.168.1.255 |
#5 Subnet Mask 255.255.255.240
Keterangan : - Total subnet : 16 subnet
- Total host : 16 host
- Host valid : 14 host valid
Contoh untuk alamat IP 192.168.1.0/28
| Jumlah Subnet | Subnet Mask | Net Id | IP host awal | IP host akhir | Broadcast Id |
| 1 | 255.255.255.240 | 192.168.1.0 | 192.168.1.1 | 192.168.1.14 | 192.168.1.15 |
| 2 | 255.255.255.240 | 192.168.1.16 | 192.168.1.17 | 192.168.1.30 | 192.168.1.31 |
| 3 | 255.255.255.240 | 192.168.1.32 | 192.168.1.33 | 192.168.1.46 | 192.168.1.47 |
| 4 | 255.255.255.240 | 192.168.1.48 | 192.168.1.49 | 192.168.1.62 | 192.168.1.63 |
| 5 | 255.255.255.240 | 192.168.1.64 | 192.168.1.65 | 192.168.1.78 | 192.168.1.79 |
| 6 | 255.255.255.240 | 192.168.1.80 | 192.168.1.81 | 192.168.1.94 | 192.168.1.95 |
| 7 | 255.255.255.240 | 192.168.1.96 | 192.168.1.97 | 192.168.1.110 | 192.168.1.111 |
| 8 | 255.255.255.240 | 192.168.1.112 | 192.168.1.113 | 192.168.1.126 | 192.168.1.127 |
| 9 | 255.255.255.240 | 192.168.1.128 | 192.168.1.129 | 192.168.1.142 | 192.168.1.143 |
| 10 | 255.255.255.240 | 192.168.1.144 | 192.168.1.145 | 192.168.1.158 | 192.168.1.159 |
| 11 | 255.255.255.240 | 192.168.1.160 | 192.168.1.161 | 192.168.1.174 | 192.168.1.175 |
| 12 | 255.255.255.240 | 192.168.1.176 | 192.168.1.177 | 192.168.1.190 | 192.168.1.191 |
| 13 | 255.255.255.240 | 192.168.1.192 | 192.168.1.193 | 192.168.1.206 | 192.168.1.207 |
| 14 | 255.255.255.240 | 192.168.1.208 | 192.168.1.209 | 192.168.1.222 | 192.168.1.223 |
| 15 | 255.255.255.240 | 192.168.1.224 | 192.168.1.225 | 192.168.1.238 | 192.168.1.239 |
| 16 | 255.255.255.240 | 192.168.1.240 | 192.168.1.241 | 192.168.1.254 | 192.168.1.255 |
#6 Subnet Mask 255.255.255.248
Keterangan : - Total subnet : 32 subnet
- Total host : 8 host
- Host valid : 6 host valid
Contoh untuk alamat IP 192.168.1.0/29
| Jumlah Subnet | Subnet Mask | Net Id | IP host awal | IP host akhir | Broadcast Id |
| 1 | 255.255.255.248 | 192.168.1.0 | 192.168.1.1 | 192.168.1.6 | 192.168.1.7 |
| 2 | 255.255.255.248 | 192.168.1.8 | 192.168.1.9 | 192.168.1.14 | 192.168.1.15 |
| 3 | 255.255.255.248 | 192.168.1.16 | 192.168.1.17 | 192.168.1.22 | 192.168.1.23 |
| 4 | 255.255.255.248 | 192.168.1.24 | 192.168.1.25 | 192.168.1.30 | 192.168.1.31 |
| 5 | 255.255.255.248 | 192.168.1.32 | 192.168.1.33 | 192.168.1.38 | 192.168.1.39 |
| 6 | 255.255.255.248 | 192.168.1.40 | 192.168.1.41 | 192.168.1.46 | 192.168.1.47 |
| 7 | 255.255.255.248 | 192.168.1.48 | 192.168.1.49 | 192.168.1.54 | 192.168.1.55 |
| 8 | 255.255.255.248 | 192.168.1.56 | 192.168.1.57 | 192.168.1.62 | 192.168.1.63 |
| 9 | 255.255.255.248 | 192.168.1.64 | 192.168.1.65 | 192.168.1.70 | 192.168.1.71 |
| 10 | 255.255.255.248 | 192.168.1.72 | 192.168.1.73 | 192.168.1.78 | 192.168.1.79 |
| 11 | 255.255.255.248 | 192.168.1.80 | 192.168.1.81 | 192.168.1.86 | 192.168.1.87 |
| 12 | 255.255.255.248 | 192.168.1.88 | 192.168.1.89 | 192.168.1.94 | 192.168.1.95 |
| 13 | 255.255.255.248 | 192.168.1.96 | 192.168.1.97 | 192.168.1.102 | 192.168.1.103 |
| 14 | 255.255.255.248 | 192.168.1.104 | 192.168.1.105 | 192.168.1.110 | 192.168.1.111 |
| 15 | 255.255.255.248 | 192.168.1.112 | 192.168.1.113 | 192.168.1.118 | 192.168.1.119 |
| 16 | 255.255.255.248 | 192.168.1.120 | 192.168.1.121 | 192.168.1.126 | 192.168.1.127 |
| 17 | 255.255.255.248 | 192.168.1.128 | 192.168.1.129 | 192.168.1.134 | 192.168.1.135 |
| 18 | 255.255.255.248 | 192.168.1.136 | 192.168.1.137 | 192.168.1.142 | 192.168.1.143 |
| 19 | 255.255.255.248 | 192.168.1.144 | 192.168.1.145 | 192.168.1.150 | 192.168.1.151 |
| 20 | 255.255.255.248 | 192.168.1.152 | 192.168.1.153 | 192.168.1.158 | 192.168.1.159 |
| 21 | 255.255.255.248 | 192.168.1.160 | 192.168.1.161 | 192.168.1.166 | 192.168.1.167 |
| 22 | 255.255.255.248 | 192.168.1.168 | 192.168.1.169 | 192.168.1.174 | 192.168.1.175 |
| 23 | 255.255.255.248 | 192.168.1.176 | 192.168.1.177 | 192.168.1.182 | 192.168.1.183 |
| 24 | 255.255.255.248 | 192.168.1.184 | 192.168.1.185 | 192.168.1.190 | 192.168.1.191 |
| 25 | 255.255.255.248 | 192.168.1.192 | 192.168.1.193 | 192.168.1.198 | 192.168.1.199 |
| 26 | 255.255.255.248 | 192.168.1.200 | 192.168.1.201 | 192.168.1.206 | 192.168.1.207 |
| 27 | 255.255.255.248 | 192.168.1.208 | 192.168.1.209 | 192.168.1.214 | 192.168.1.215 |
| 28 | 255.255.255.248 | 192.168.1.216 | 192.168.1.217 | 192.168.1.222 | 192.168.1.223 |
| 29 | 255.255.255.248 | 192.168.1.224 | 192.168.1.225 | 192.168.1.230 | 192.168.1.231 |
| 30 | 255.255.255.248 | 192.168.1.232 | 192.168.1.233 | 192.168.1.238 | 192.168.1.239 |
| 31 | 255.255.255.248 | 192.168.1.240 | 192.168.1.241 | 192.168.1.246 | 192.168.1.247 |
| 32 | 255.255.255.248 | 192.168.1.248 | 192.168.1.249 | 192.168.1.254 | 192.168.1.255 |
#7 Subnet Mask 255.255.255.252
Keterangan : - Total subnet : 64 subnet
- Total host : 4 host
- Host valid : 2 host valid
Contoh untuk alamat IP 192.168.1.0/30
| Jumlah Subnet | Subnet Mask | Net Id | IP host awal | IP host akhir | Broadcast Id |
| 1 | 255.255.255.248 | 192.168.1.0 | 192.168.1.1 | 192.168.1.2 | 192.168.1.3 |
| 2 | 255.255.255.248 | 192.168.1.4 | 192.168.1.5 | 192.168.1.6 | 192.168.1.7 |
| 3 | 255.255.255.248 | 192.168.1.8 | 192.168.1.9 | 192.168.1.10 | 192.168.1.11 |
| 4 | 255.255.255.248 | 192.168.1.12 | 192.168.1.13 | 192.168.1.14 | 192.168.1.15 |
| 5 | 255.255.255.248 | 192.168.1.16 | 192.168.1.17 | 192.168.1.18 | 192.168.1.19 |
| 6 | 255.255.255.248 | 192.168.1.20 | 192.168.1.21 | 192.168.1.22 | 192.168.1.23 |
| 7 | 255.255.255.248 | 192.168.1.24 | 192.168.1.25 | 192.168.1.26 | 192.168.1.27 |
| 8 | 255.255.255.248 | 192.168.1.28 | 192.168.1.29 | 192.168.1.30 | 192.168.1.31 |
| 9 | 255.255.255.248 | 192.168.1.32 | 192.168.1.33 | 192.168.1.34 | 192.168.1.35 |
| 10 | 255.255.255.248 | 192.168.1.36 | 192.168.1.37 | 192.168.1.38 | 192.168.1.39 |
| 111 | 255.255.255.248 | 192.168.1.40 | 192.168.1.41 | 192.168.1.42 | 192.168.1.43 |
| 12 | 255.255.255.248 | 192.168.1.44 | 192.168.1.45 | 192.168.1.46 | 192.168.1.47 |
| 13 | 255.255.255.248 | 192.168.1.48 | 192.168.1.49 | 192.168.1.50 | 192.168.1.51 |
| 14 | 255.255.255.248 | 192.168.1.52 | 192.168.1.53 | 192.168.1.54 | 192.168.1.55 |
| 15 | 255.255.255.248 | 192.168.1.56 | 192.168.1.57 | 192.168.1.58 | 192.168.1.59 |
| 16 | 255.255.255.248 | 192.168.1.60 | 192.168.1.61 | 192.168.1.62 | 192.168.1.63 |
| 17 | 255.255.255.248 | 192.168.1.64 | 192.168.1.65 | 192.168.1.66 | 192.168.1.67 |
| 18 | 255.255.255.248 | 192.168.1.68 | 192.168.1.69 | 192.168.1.70 | 192.168.1.71 |
| 19 | 255.255.255.248 | 192.168.1.72 | 192.168.1.73 | 192.168.1.74 | 192.168.1.75 |
| 20 | 255.255.255.248 | 192.168.1.76 | 192.168.1.77 | 192.168.1.78 | 192.168.1.79 |
| 21 | 255.255.255.248 | 192.168.1.80 | 192.168.1.81 | 192.168.1.82 | 192.168.1.83 |
| 22 | 255.255.255.248 | 192.168.1.84 | 192.168.1.85 | 192.168.1.86 | 192.168.1.87 |
| 23 | 255.255.255.248 | 192.168.1.88 | 192.168.1.89 | 192.168.1.90 | 192.168.1.91 |
| 24 | 255.255.255.248 | 192.168.1.92 | 192.168.1.93 | 192.168.1.94 | 192.168.1.95 |
| 25 | 255.255.255.248 | 192.168.1.96 | 192.168.1.97 | 192.168.1.98 | 192.168.1.99 |
| 26 | 255.255.255.248 | 192.168.1.100 | 192.168.1.101 | 192.168.1.102 | 192.168.1.103 |
| 27 | 255.255.255.248 | 192.168.1.104 | 192.168.1.105 | 192.168.1.106 | 192.168.1.107 |
| 28 | 255.255.255.248 | 192.168.1.108 | 192.168.1.109 | 192.168.1.110 | 192.168.1.111 |
| 29 | 255.255.255.248 | 192.168.1.112 | 192.168.1.113 | 192.168.1.114 | 192.168.1.115 |
| 30 | 255.255.255.248 | 192.168.1.116 | 192.168.1.117 | 192.168.1.118 | 192.168.1.119 |
| 31 | 255.255.255.248 | 192.168.1.120 | 192.168.1.121 | 192.168.1.122 | 192.168.1.123 |
| 32 | 255.255.255.248 | 192.168.1.124 | 192.168.1.125 | 192.168.1.126 | 192.168.1.127 |
| 33 | 255.255.255.248 | 192.168.1.128 | 192.168.1.129 | 192.168.1.130 | 192.168.1.131 |
| 34 | 255.255.255.248 | 192.168.1.132 | 192.168.1.133 | 192.168.1.134 | 192.168.1.135 |
| 35 | 255.255.255.248 | 192.168.1.136 | 192.168.1.137 | 192.168.1.138 | 192.168.1.139 |
| 36 | 255.255.255.248 | 192.168.1.140 | 192.168.1.141 | 192.168.1.142 | 192.168.1.143 |
| 37 | 255.255.255.248 | 192.168.1.144 | 192.168.1.145 | 192.168.1.146 | 192.168.1.147 |
| 38 | 255.255.255.248 | 192.168.1.148 | 192.168.1.149 | 192.168.1.150 | 192.168.1.151 |
| 39 | 255.255.255.248 | 192.168.1.152 | 192.168.1.153 | 192.168.1.154 | 192.168.1.155 |
| 40 | 255.255.255.248 | 192.168.1.156 | 192.168.1.157 | 192.168.1.158 | 192.168.1.159 |
| 41 | 255.255.255.248 | 192.168.1.160 | 192.168.1.161 | 192.168.1.162 | 192.168.1.163 |
| 42 | 255.255.255.248 | 192.168.1.164 | 192.168.1.165 | 192.168.1.166 | 192.168.1.167 |
| 43 | 255.255.255.248 | 192.168.1.168 | 192.168.1.169 | 192.168.1.170 | 192.168.1.171 |
| 44 | 255.255.255.248 | 192.168.1.172 | 192.168.1.173 | 192.168.1.174 | 192.168.1.175 |
| 45 | 255.255.255.248 | 192.168.1.176 | 192.168.1.177 | 192.168.1.178 | 192.168.1.179 |
| 46 | 255.255.255.248 | 192.168.1.180 | 192.168.1.181 | 192.168.1.182 | 192.168.1.183 |
| 47 | 255.255.255.248 | 192.168.1.184 | 192.168.1.185 | 192.168.1.186 | 192.168.1.187 |
| 48 | 255.255.255.248 | 192.168.1.188 | 192.168.1.189 | 192.168.1.190 | 192.168.1.191 |
| 49 | 255.255.255.248 | 192.168.1.192 | 192.168.1.193 | 192.168.1.194 | 192.168.1.195 |
| 50 | 255.255.255.248 | 192.168.1.196 | 192.168.1.197 | 192.168.1.198 | 192.168.1.199 |
| 51 | 255.255.255.248 | 192.168.1.200 | 192.168.1.201 | 192.168.1.202 | 192.168.1.203 |
| 52 | 255.255.255.248 | 192.168.1.204 | 192.168.1.205 | 192.168.1.206 | 192.168.1.207 |
| 53 | 255.255.255.248 | 192.168.1.208 | 192.168.1.209 | 192.168.1.210 | 192.168.1.211 |
| 54 | 255.255.255.248 | 192.168.1.212 | 192.168.1.213 | 192.168.1.214 | 192.168.1.215 |
| 55 | 255.255.255.248 | 192.168.1.216 | 192.168.1.217 | 192.168.1.218 | 192.168.1.219 |
| 56 | 255.255.255.248 | 192.168.1.220 | 192.168.1.221 | 192.168.1.222 | 192.168.1.223 |
| 57 | 255.255.255.248 | 192.168.1.224 | 192.168.1.225 | 192.168.1.226 | 192.168.1.227 |
| 58 | 255.255.255.248 | 192.168.1.228 | 192.168.1.229 | 192.168.1.230 | 192.168.1.231 |
| 59 | 255.255.255.248 | 192.168.1.232 | 192.168.1.233 | 192.168.1.234 | 192.168.1.235 |
| 60 | 255.255.255.248 | 192.168.1.236 | 192.168.1.237 | 192.168.1.248 | 192.168.1.239 |
| 61 | 255.255.255.248 | 192.168.1.240 | 192.168.1.241 | 192.168.1.242 | 192.168.1.243 |
| 62 | 255.255.255.248 | 192.168.1.244 | 192.168.1.245 | 192.168.1.246 | 192.168.1.247 |
| 63 | 255.255.255.248 | 192.168.1.248 | 192.168.1.249 | 192.168.1.250 | 192.168.1.251 |
| 64 | 255.255.255.248 | 192.168.1.252 | 192.168.1.253 | 192.168.1.254 | 192.168.1.255 |
Keterangan : 
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