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.

Try:192.168.1.10/24 10.0.0.0/8 172.16.5.4/20 203.0.113.9/29

IPv6 calculator →

private IP (RFC 1918)10.2.8.0/21

network10.2.8.0/21

broadcast10.2.15.255

first host10.2.8.1

last host10.2.15.254

subnet mask255.255.248.0

wildcard0.0.7.255

addresses2,048

usable hosts2,046

classA

ipcalc 10.2.8.0/21

address00001010.00000010.00001000.00000000

subnet mask11111111.11111111.11111000.00000000

network00001010.00000010.00001000.00000000

broadcast00001010.00000010.00001111.11111111

green = network part, grey = host part

hex0x0a020800

decimal167905280

reverse dns0.8.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:800

/21 split into /31 · 1,024 subnets

close ×

#	network	host range	broadcast
1	10.2.8.0/31	10.2.8.0 – 10.2.8.1	10.2.8.1
2	10.2.8.2/31	10.2.8.2 – 10.2.8.3	10.2.8.3
3	10.2.8.4/31	10.2.8.4 – 10.2.8.5	10.2.8.5
4	10.2.8.6/31	10.2.8.6 – 10.2.8.7	10.2.8.7
5	10.2.8.8/31	10.2.8.8 – 10.2.8.9	10.2.8.9
6	10.2.8.10/31	10.2.8.10 – 10.2.8.11	10.2.8.11
7	10.2.8.12/31	10.2.8.12 – 10.2.8.13	10.2.8.13
8	10.2.8.14/31	10.2.8.14 – 10.2.8.15	10.2.8.15
9	10.2.8.16/31	10.2.8.16 – 10.2.8.17	10.2.8.17
10	10.2.8.18/31	10.2.8.18 – 10.2.8.19	10.2.8.19
11	10.2.8.20/31	10.2.8.20 – 10.2.8.21	10.2.8.21
12	10.2.8.22/31	10.2.8.22 – 10.2.8.23	10.2.8.23
13	10.2.8.24/31	10.2.8.24 – 10.2.8.25	10.2.8.25
14	10.2.8.26/31	10.2.8.26 – 10.2.8.27	10.2.8.27
15	10.2.8.28/31	10.2.8.28 – 10.2.8.29	10.2.8.29
16	10.2.8.30/31	10.2.8.30 – 10.2.8.31	10.2.8.31
17	10.2.8.32/31	10.2.8.32 – 10.2.8.33	10.2.8.33
18	10.2.8.34/31	10.2.8.34 – 10.2.8.35	10.2.8.35
19	10.2.8.36/31	10.2.8.36 – 10.2.8.37	10.2.8.37
20	10.2.8.38/31	10.2.8.38 – 10.2.8.39	10.2.8.39
21	10.2.8.40/31	10.2.8.40 – 10.2.8.41	10.2.8.41
22	10.2.8.42/31	10.2.8.42 – 10.2.8.43	10.2.8.43
23	10.2.8.44/31	10.2.8.44 – 10.2.8.45	10.2.8.45
24	10.2.8.46/31	10.2.8.46 – 10.2.8.47	10.2.8.47
25	10.2.8.48/31	10.2.8.48 – 10.2.8.49	10.2.8.49
26	10.2.8.50/31	10.2.8.50 – 10.2.8.51	10.2.8.51
27	10.2.8.52/31	10.2.8.52 – 10.2.8.53	10.2.8.53
28	10.2.8.54/31	10.2.8.54 – 10.2.8.55	10.2.8.55
29	10.2.8.56/31	10.2.8.56 – 10.2.8.57	10.2.8.57
30	10.2.8.58/31	10.2.8.58 – 10.2.8.59	10.2.8.59
31	10.2.8.60/31	10.2.8.60 – 10.2.8.61	10.2.8.61
32	10.2.8.62/31	10.2.8.62 – 10.2.8.63	10.2.8.63
33	10.2.8.64/31	10.2.8.64 – 10.2.8.65	10.2.8.65
34	10.2.8.66/31	10.2.8.66 – 10.2.8.67	10.2.8.67
35	10.2.8.68/31	10.2.8.68 – 10.2.8.69	10.2.8.69
36	10.2.8.70/31	10.2.8.70 – 10.2.8.71	10.2.8.71
37	10.2.8.72/31	10.2.8.72 – 10.2.8.73	10.2.8.73
38	10.2.8.74/31	10.2.8.74 – 10.2.8.75	10.2.8.75
39	10.2.8.76/31	10.2.8.76 – 10.2.8.77	10.2.8.77
40	10.2.8.78/31	10.2.8.78 – 10.2.8.79	10.2.8.79
41	10.2.8.80/31	10.2.8.80 – 10.2.8.81	10.2.8.81
42	10.2.8.82/31	10.2.8.82 – 10.2.8.83	10.2.8.83
43	10.2.8.84/31	10.2.8.84 – 10.2.8.85	10.2.8.85
44	10.2.8.86/31	10.2.8.86 – 10.2.8.87	10.2.8.87
45	10.2.8.88/31	10.2.8.88 – 10.2.8.89	10.2.8.89
46	10.2.8.90/31	10.2.8.90 – 10.2.8.91	10.2.8.91
47	10.2.8.92/31	10.2.8.92 – 10.2.8.93	10.2.8.93
48	10.2.8.94/31	10.2.8.94 – 10.2.8.95	10.2.8.95
49	10.2.8.96/31	10.2.8.96 – 10.2.8.97	10.2.8.97
50	10.2.8.98/31	10.2.8.98 – 10.2.8.99	10.2.8.99
51	10.2.8.100/31	10.2.8.100 – 10.2.8.101	10.2.8.101
52	10.2.8.102/31	10.2.8.102 – 10.2.8.103	10.2.8.103
53	10.2.8.104/31	10.2.8.104 – 10.2.8.105	10.2.8.105
54	10.2.8.106/31	10.2.8.106 – 10.2.8.107	10.2.8.107
55	10.2.8.108/31	10.2.8.108 – 10.2.8.109	10.2.8.109
56	10.2.8.110/31	10.2.8.110 – 10.2.8.111	10.2.8.111
57	10.2.8.112/31	10.2.8.112 – 10.2.8.113	10.2.8.113
58	10.2.8.114/31	10.2.8.114 – 10.2.8.115	10.2.8.115
59	10.2.8.116/31	10.2.8.116 – 10.2.8.117	10.2.8.117
60	10.2.8.118/31	10.2.8.118 – 10.2.8.119	10.2.8.119
61	10.2.8.120/31	10.2.8.120 – 10.2.8.121	10.2.8.121
62	10.2.8.122/31	10.2.8.122 – 10.2.8.123	10.2.8.123
63	10.2.8.124/31	10.2.8.124 – 10.2.8.125	10.2.8.125
64	10.2.8.126/31	10.2.8.126 – 10.2.8.127	10.2.8.127
65	10.2.8.128/31	10.2.8.128 – 10.2.8.129	10.2.8.129
66	10.2.8.130/31	10.2.8.130 – 10.2.8.131	10.2.8.131
67	10.2.8.132/31	10.2.8.132 – 10.2.8.133	10.2.8.133
68	10.2.8.134/31	10.2.8.134 – 10.2.8.135	10.2.8.135
69	10.2.8.136/31	10.2.8.136 – 10.2.8.137	10.2.8.137
70	10.2.8.138/31	10.2.8.138 – 10.2.8.139	10.2.8.139
71	10.2.8.140/31	10.2.8.140 – 10.2.8.141	10.2.8.141
72	10.2.8.142/31	10.2.8.142 – 10.2.8.143	10.2.8.143
73	10.2.8.144/31	10.2.8.144 – 10.2.8.145	10.2.8.145
74	10.2.8.146/31	10.2.8.146 – 10.2.8.147	10.2.8.147
75	10.2.8.148/31	10.2.8.148 – 10.2.8.149	10.2.8.149
76	10.2.8.150/31	10.2.8.150 – 10.2.8.151	10.2.8.151
77	10.2.8.152/31	10.2.8.152 – 10.2.8.153	10.2.8.153
78	10.2.8.154/31	10.2.8.154 – 10.2.8.155	10.2.8.155
79	10.2.8.156/31	10.2.8.156 – 10.2.8.157	10.2.8.157
80	10.2.8.158/31	10.2.8.158 – 10.2.8.159	10.2.8.159
81	10.2.8.160/31	10.2.8.160 – 10.2.8.161	10.2.8.161
82	10.2.8.162/31	10.2.8.162 – 10.2.8.163	10.2.8.163
83	10.2.8.164/31	10.2.8.164 – 10.2.8.165	10.2.8.165
84	10.2.8.166/31	10.2.8.166 – 10.2.8.167	10.2.8.167
85	10.2.8.168/31	10.2.8.168 – 10.2.8.169	10.2.8.169
86	10.2.8.170/31	10.2.8.170 – 10.2.8.171	10.2.8.171
87	10.2.8.172/31	10.2.8.172 – 10.2.8.173	10.2.8.173
88	10.2.8.174/31	10.2.8.174 – 10.2.8.175	10.2.8.175
89	10.2.8.176/31	10.2.8.176 – 10.2.8.177	10.2.8.177
90	10.2.8.178/31	10.2.8.178 – 10.2.8.179	10.2.8.179
91	10.2.8.180/31	10.2.8.180 – 10.2.8.181	10.2.8.181
92	10.2.8.182/31	10.2.8.182 – 10.2.8.183	10.2.8.183
93	10.2.8.184/31	10.2.8.184 – 10.2.8.185	10.2.8.185
94	10.2.8.186/31	10.2.8.186 – 10.2.8.187	10.2.8.187
95	10.2.8.188/31	10.2.8.188 – 10.2.8.189	10.2.8.189
96	10.2.8.190/31	10.2.8.190 – 10.2.8.191	10.2.8.191
97	10.2.8.192/31	10.2.8.192 – 10.2.8.193	10.2.8.193
98	10.2.8.194/31	10.2.8.194 – 10.2.8.195	10.2.8.195
99	10.2.8.196/31	10.2.8.196 – 10.2.8.197	10.2.8.197
100	10.2.8.198/31	10.2.8.198 – 10.2.8.199	10.2.8.199
101	10.2.8.200/31	10.2.8.200 – 10.2.8.201	10.2.8.201
102	10.2.8.202/31	10.2.8.202 – 10.2.8.203	10.2.8.203
103	10.2.8.204/31	10.2.8.204 – 10.2.8.205	10.2.8.205
104	10.2.8.206/31	10.2.8.206 – 10.2.8.207	10.2.8.207
105	10.2.8.208/31	10.2.8.208 – 10.2.8.209	10.2.8.209
106	10.2.8.210/31	10.2.8.210 – 10.2.8.211	10.2.8.211
107	10.2.8.212/31	10.2.8.212 – 10.2.8.213	10.2.8.213
108	10.2.8.214/31	10.2.8.214 – 10.2.8.215	10.2.8.215
109	10.2.8.216/31	10.2.8.216 – 10.2.8.217	10.2.8.217
110	10.2.8.218/31	10.2.8.218 – 10.2.8.219	10.2.8.219
111	10.2.8.220/31	10.2.8.220 – 10.2.8.221	10.2.8.221
112	10.2.8.222/31	10.2.8.222 – 10.2.8.223	10.2.8.223
113	10.2.8.224/31	10.2.8.224 – 10.2.8.225	10.2.8.225
114	10.2.8.226/31	10.2.8.226 – 10.2.8.227	10.2.8.227
115	10.2.8.228/31	10.2.8.228 – 10.2.8.229	10.2.8.229
116	10.2.8.230/31	10.2.8.230 – 10.2.8.231	10.2.8.231
117	10.2.8.232/31	10.2.8.232 – 10.2.8.233	10.2.8.233
118	10.2.8.234/31	10.2.8.234 – 10.2.8.235	10.2.8.235
119	10.2.8.236/31	10.2.8.236 – 10.2.8.237	10.2.8.237
120	10.2.8.238/31	10.2.8.238 – 10.2.8.239	10.2.8.239
121	10.2.8.240/31	10.2.8.240 – 10.2.8.241	10.2.8.241
122	10.2.8.242/31	10.2.8.242 – 10.2.8.243	10.2.8.243
123	10.2.8.244/31	10.2.8.244 – 10.2.8.245	10.2.8.245
124	10.2.8.246/31	10.2.8.246 – 10.2.8.247	10.2.8.247
125	10.2.8.248/31	10.2.8.248 – 10.2.8.249	10.2.8.249
126	10.2.8.250/31	10.2.8.250 – 10.2.8.251	10.2.8.251
127	10.2.8.252/31	10.2.8.252 – 10.2.8.253	10.2.8.253
128	10.2.8.254/31	10.2.8.254 – 10.2.8.255	10.2.8.255
129	10.2.9.0/31	10.2.9.0 – 10.2.9.1	10.2.9.1
130	10.2.9.2/31	10.2.9.2 – 10.2.9.3	10.2.9.3
131	10.2.9.4/31	10.2.9.4 – 10.2.9.5	10.2.9.5
132	10.2.9.6/31	10.2.9.6 – 10.2.9.7	10.2.9.7
133	10.2.9.8/31	10.2.9.8 – 10.2.9.9	10.2.9.9
134	10.2.9.10/31	10.2.9.10 – 10.2.9.11	10.2.9.11
135	10.2.9.12/31	10.2.9.12 – 10.2.9.13	10.2.9.13
136	10.2.9.14/31	10.2.9.14 – 10.2.9.15	10.2.9.15
137	10.2.9.16/31	10.2.9.16 – 10.2.9.17	10.2.9.17
138	10.2.9.18/31	10.2.9.18 – 10.2.9.19	10.2.9.19
139	10.2.9.20/31	10.2.9.20 – 10.2.9.21	10.2.9.21
140	10.2.9.22/31	10.2.9.22 – 10.2.9.23	10.2.9.23
141	10.2.9.24/31	10.2.9.24 – 10.2.9.25	10.2.9.25
142	10.2.9.26/31	10.2.9.26 – 10.2.9.27	10.2.9.27
143	10.2.9.28/31	10.2.9.28 – 10.2.9.29	10.2.9.29
144	10.2.9.30/31	10.2.9.30 – 10.2.9.31	10.2.9.31
145	10.2.9.32/31	10.2.9.32 – 10.2.9.33	10.2.9.33
146	10.2.9.34/31	10.2.9.34 – 10.2.9.35	10.2.9.35
147	10.2.9.36/31	10.2.9.36 – 10.2.9.37	10.2.9.37
148	10.2.9.38/31	10.2.9.38 – 10.2.9.39	10.2.9.39
149	10.2.9.40/31	10.2.9.40 – 10.2.9.41	10.2.9.41
150	10.2.9.42/31	10.2.9.42 – 10.2.9.43	10.2.9.43
151	10.2.9.44/31	10.2.9.44 – 10.2.9.45	10.2.9.45
152	10.2.9.46/31	10.2.9.46 – 10.2.9.47	10.2.9.47
153	10.2.9.48/31	10.2.9.48 – 10.2.9.49	10.2.9.49
154	10.2.9.50/31	10.2.9.50 – 10.2.9.51	10.2.9.51
155	10.2.9.52/31	10.2.9.52 – 10.2.9.53	10.2.9.53
156	10.2.9.54/31	10.2.9.54 – 10.2.9.55	10.2.9.55
157	10.2.9.56/31	10.2.9.56 – 10.2.9.57	10.2.9.57
158	10.2.9.58/31	10.2.9.58 – 10.2.9.59	10.2.9.59
159	10.2.9.60/31	10.2.9.60 – 10.2.9.61	10.2.9.61
160	10.2.9.62/31	10.2.9.62 – 10.2.9.63	10.2.9.63
161	10.2.9.64/31	10.2.9.64 – 10.2.9.65	10.2.9.65
162	10.2.9.66/31	10.2.9.66 – 10.2.9.67	10.2.9.67
163	10.2.9.68/31	10.2.9.68 – 10.2.9.69	10.2.9.69
164	10.2.9.70/31	10.2.9.70 – 10.2.9.71	10.2.9.71
165	10.2.9.72/31	10.2.9.72 – 10.2.9.73	10.2.9.73
166	10.2.9.74/31	10.2.9.74 – 10.2.9.75	10.2.9.75
167	10.2.9.76/31	10.2.9.76 – 10.2.9.77	10.2.9.77
168	10.2.9.78/31	10.2.9.78 – 10.2.9.79	10.2.9.79
169	10.2.9.80/31	10.2.9.80 – 10.2.9.81	10.2.9.81
170	10.2.9.82/31	10.2.9.82 – 10.2.9.83	10.2.9.83
171	10.2.9.84/31	10.2.9.84 – 10.2.9.85	10.2.9.85
172	10.2.9.86/31	10.2.9.86 – 10.2.9.87	10.2.9.87
173	10.2.9.88/31	10.2.9.88 – 10.2.9.89	10.2.9.89
174	10.2.9.90/31	10.2.9.90 – 10.2.9.91	10.2.9.91
175	10.2.9.92/31	10.2.9.92 – 10.2.9.93	10.2.9.93
176	10.2.9.94/31	10.2.9.94 – 10.2.9.95	10.2.9.95
177	10.2.9.96/31	10.2.9.96 – 10.2.9.97	10.2.9.97
178	10.2.9.98/31	10.2.9.98 – 10.2.9.99	10.2.9.99
179	10.2.9.100/31	10.2.9.100 – 10.2.9.101	10.2.9.101
180	10.2.9.102/31	10.2.9.102 – 10.2.9.103	10.2.9.103
181	10.2.9.104/31	10.2.9.104 – 10.2.9.105	10.2.9.105
182	10.2.9.106/31	10.2.9.106 – 10.2.9.107	10.2.9.107
183	10.2.9.108/31	10.2.9.108 – 10.2.9.109	10.2.9.109
184	10.2.9.110/31	10.2.9.110 – 10.2.9.111	10.2.9.111
185	10.2.9.112/31	10.2.9.112 – 10.2.9.113	10.2.9.113
186	10.2.9.114/31	10.2.9.114 – 10.2.9.115	10.2.9.115
187	10.2.9.116/31	10.2.9.116 – 10.2.9.117	10.2.9.117
188	10.2.9.118/31	10.2.9.118 – 10.2.9.119	10.2.9.119
189	10.2.9.120/31	10.2.9.120 – 10.2.9.121	10.2.9.121
190	10.2.9.122/31	10.2.9.122 – 10.2.9.123	10.2.9.123
191	10.2.9.124/31	10.2.9.124 – 10.2.9.125	10.2.9.125
192	10.2.9.126/31	10.2.9.126 – 10.2.9.127	10.2.9.127
193	10.2.9.128/31	10.2.9.128 – 10.2.9.129	10.2.9.129
194	10.2.9.130/31	10.2.9.130 – 10.2.9.131	10.2.9.131
195	10.2.9.132/31	10.2.9.132 – 10.2.9.133	10.2.9.133
196	10.2.9.134/31	10.2.9.134 – 10.2.9.135	10.2.9.135
197	10.2.9.136/31	10.2.9.136 – 10.2.9.137	10.2.9.137
198	10.2.9.138/31	10.2.9.138 – 10.2.9.139	10.2.9.139
199	10.2.9.140/31	10.2.9.140 – 10.2.9.141	10.2.9.141
200	10.2.9.142/31	10.2.9.142 – 10.2.9.143	10.2.9.143
201	10.2.9.144/31	10.2.9.144 – 10.2.9.145	10.2.9.145
202	10.2.9.146/31	10.2.9.146 – 10.2.9.147	10.2.9.147
203	10.2.9.148/31	10.2.9.148 – 10.2.9.149	10.2.9.149
204	10.2.9.150/31	10.2.9.150 – 10.2.9.151	10.2.9.151
205	10.2.9.152/31	10.2.9.152 – 10.2.9.153	10.2.9.153
206	10.2.9.154/31	10.2.9.154 – 10.2.9.155	10.2.9.155
207	10.2.9.156/31	10.2.9.156 – 10.2.9.157	10.2.9.157
208	10.2.9.158/31	10.2.9.158 – 10.2.9.159	10.2.9.159
209	10.2.9.160/31	10.2.9.160 – 10.2.9.161	10.2.9.161
210	10.2.9.162/31	10.2.9.162 – 10.2.9.163	10.2.9.163
211	10.2.9.164/31	10.2.9.164 – 10.2.9.165	10.2.9.165
212	10.2.9.166/31	10.2.9.166 – 10.2.9.167	10.2.9.167
213	10.2.9.168/31	10.2.9.168 – 10.2.9.169	10.2.9.169
214	10.2.9.170/31	10.2.9.170 – 10.2.9.171	10.2.9.171
215	10.2.9.172/31	10.2.9.172 – 10.2.9.173	10.2.9.173
216	10.2.9.174/31	10.2.9.174 – 10.2.9.175	10.2.9.175
217	10.2.9.176/31	10.2.9.176 – 10.2.9.177	10.2.9.177
218	10.2.9.178/31	10.2.9.178 – 10.2.9.179	10.2.9.179
219	10.2.9.180/31	10.2.9.180 – 10.2.9.181	10.2.9.181
220	10.2.9.182/31	10.2.9.182 – 10.2.9.183	10.2.9.183
221	10.2.9.184/31	10.2.9.184 – 10.2.9.185	10.2.9.185
222	10.2.9.186/31	10.2.9.186 – 10.2.9.187	10.2.9.187
223	10.2.9.188/31	10.2.9.188 – 10.2.9.189	10.2.9.189
224	10.2.9.190/31	10.2.9.190 – 10.2.9.191	10.2.9.191
225	10.2.9.192/31	10.2.9.192 – 10.2.9.193	10.2.9.193
226	10.2.9.194/31	10.2.9.194 – 10.2.9.195	10.2.9.195
227	10.2.9.196/31	10.2.9.196 – 10.2.9.197	10.2.9.197
228	10.2.9.198/31	10.2.9.198 – 10.2.9.199	10.2.9.199
229	10.2.9.200/31	10.2.9.200 – 10.2.9.201	10.2.9.201
230	10.2.9.202/31	10.2.9.202 – 10.2.9.203	10.2.9.203
231	10.2.9.204/31	10.2.9.204 – 10.2.9.205	10.2.9.205
232	10.2.9.206/31	10.2.9.206 – 10.2.9.207	10.2.9.207
233	10.2.9.208/31	10.2.9.208 – 10.2.9.209	10.2.9.209
234	10.2.9.210/31	10.2.9.210 – 10.2.9.211	10.2.9.211
235	10.2.9.212/31	10.2.9.212 – 10.2.9.213	10.2.9.213
236	10.2.9.214/31	10.2.9.214 – 10.2.9.215	10.2.9.215
237	10.2.9.216/31	10.2.9.216 – 10.2.9.217	10.2.9.217
238	10.2.9.218/31	10.2.9.218 – 10.2.9.219	10.2.9.219
239	10.2.9.220/31	10.2.9.220 – 10.2.9.221	10.2.9.221
240	10.2.9.222/31	10.2.9.222 – 10.2.9.223	10.2.9.223
241	10.2.9.224/31	10.2.9.224 – 10.2.9.225	10.2.9.225
242	10.2.9.226/31	10.2.9.226 – 10.2.9.227	10.2.9.227
243	10.2.9.228/31	10.2.9.228 – 10.2.9.229	10.2.9.229
244	10.2.9.230/31	10.2.9.230 – 10.2.9.231	10.2.9.231
245	10.2.9.232/31	10.2.9.232 – 10.2.9.233	10.2.9.233
246	10.2.9.234/31	10.2.9.234 – 10.2.9.235	10.2.9.235
247	10.2.9.236/31	10.2.9.236 – 10.2.9.237	10.2.9.237
248	10.2.9.238/31	10.2.9.238 – 10.2.9.239	10.2.9.239
249	10.2.9.240/31	10.2.9.240 – 10.2.9.241	10.2.9.241
250	10.2.9.242/31	10.2.9.242 – 10.2.9.243	10.2.9.243
251	10.2.9.244/31	10.2.9.244 – 10.2.9.245	10.2.9.245
252	10.2.9.246/31	10.2.9.246 – 10.2.9.247	10.2.9.247
253	10.2.9.248/31	10.2.9.248 – 10.2.9.249	10.2.9.249
254	10.2.9.250/31	10.2.9.250 – 10.2.9.251	10.2.9.251
255	10.2.9.252/31	10.2.9.252 – 10.2.9.253	10.2.9.253
256	10.2.9.254/31	10.2.9.254 – 10.2.9.255	10.2.9.255

showing 256 of 1,024

01 / table

IPv4 CIDR prefix table.

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

prefix	subnet mask	addresses	hosts	in your /21
/0	0.0.0.0	4,294,967,296	4,294,967,294	-
/1	128.0.0.0	2,147,483,648	2,147,483,646	-
/2	192.0.0.0	1,073,741,824	1,073,741,822	-
/3	224.0.0.0	536,870,912	536,870,910	-
/4	240.0.0.0	268,435,456	268,435,454	-
/5	248.0.0.0	134,217,728	134,217,726	-
/6	252.0.0.0	67,108,864	67,108,862	-
/7	254.0.0.0	33,554,432	33,554,430	-
/8	255.0.0.0	16,777,216	16,777,214	-
/9	255.128.0.0	8,388,608	8,388,606	-
/10	255.192.0.0	4,194,304	4,194,302	-
/11	255.224.0.0	2,097,152	2,097,150	-
/12	255.240.0.0	1,048,576	1,048,574	-
/13	255.248.0.0	524,288	524,286	-
/14	255.252.0.0	262,144	262,142	-
/15	255.254.0.0	131,072	131,070	-
/16	255.255.0.0	65,536	65,534	-
/17	255.255.128.0	32,768	32,766	-
/18	255.255.192.0	16,384	16,382	-
/19	255.255.224.0	8,192	8,190	-
/20	255.255.240.0	4,096	4,094	-
/21	255.255.248.0	2,048	2,046	1
/22	255.255.252.0	1,024	1,022	2 split →
/23	255.255.254.0	512	510	4 split →
/24	255.255.255.0	256	254	8 split →
/25	255.255.255.128	128	126	16 split →
/26	255.255.255.192	64	62	32 split →
/27	255.255.255.224	32	30	64 split →
/28	255.255.255.240	16	14	128 split →
/29	255.255.255.248	8	6	256 split →
/30	255.255.255.252	4	2	512 split →
/31	255.255.255.254	2	2	1,024 split →
/32	255.255.255.255	1	1	2,048 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 →