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)10.7.216.0/21

network10.7.216.0/21

broadcast10.7.223.255

first host10.7.216.1

last host10.7.223.254

subnet mask255.255.248.0

wildcard0.0.7.255

addresses2,048

usable hosts2,046

classA

ipcalc 10.7.216.0/21

address00001010.00000111.11011000.00000000

subnet mask11111111.11111111.11111000.00000000

network00001010.00000111.11011000.00000000

broadcast00001010.00000111.11011111.11111111

green = network part, grey = host part

hex0x0a07d800

decimal168286208

reverse dns0.216.7.10.in-addr.arpa

ipv4-mapped::ffff:a07:d800

/21 split into /31 · 1,024 subnets

close ×

#	network	host range	broadcast
1	10.7.216.0/31	10.7.216.0 – 10.7.216.1	10.7.216.1
2	10.7.216.2/31	10.7.216.2 – 10.7.216.3	10.7.216.3
3	10.7.216.4/31	10.7.216.4 – 10.7.216.5	10.7.216.5
4	10.7.216.6/31	10.7.216.6 – 10.7.216.7	10.7.216.7
5	10.7.216.8/31	10.7.216.8 – 10.7.216.9	10.7.216.9
6	10.7.216.10/31	10.7.216.10 – 10.7.216.11	10.7.216.11
7	10.7.216.12/31	10.7.216.12 – 10.7.216.13	10.7.216.13
8	10.7.216.14/31	10.7.216.14 – 10.7.216.15	10.7.216.15
9	10.7.216.16/31	10.7.216.16 – 10.7.216.17	10.7.216.17
10	10.7.216.18/31	10.7.216.18 – 10.7.216.19	10.7.216.19
11	10.7.216.20/31	10.7.216.20 – 10.7.216.21	10.7.216.21
12	10.7.216.22/31	10.7.216.22 – 10.7.216.23	10.7.216.23
13	10.7.216.24/31	10.7.216.24 – 10.7.216.25	10.7.216.25
14	10.7.216.26/31	10.7.216.26 – 10.7.216.27	10.7.216.27
15	10.7.216.28/31	10.7.216.28 – 10.7.216.29	10.7.216.29
16	10.7.216.30/31	10.7.216.30 – 10.7.216.31	10.7.216.31
17	10.7.216.32/31	10.7.216.32 – 10.7.216.33	10.7.216.33
18	10.7.216.34/31	10.7.216.34 – 10.7.216.35	10.7.216.35
19	10.7.216.36/31	10.7.216.36 – 10.7.216.37	10.7.216.37
20	10.7.216.38/31	10.7.216.38 – 10.7.216.39	10.7.216.39
21	10.7.216.40/31	10.7.216.40 – 10.7.216.41	10.7.216.41
22	10.7.216.42/31	10.7.216.42 – 10.7.216.43	10.7.216.43
23	10.7.216.44/31	10.7.216.44 – 10.7.216.45	10.7.216.45
24	10.7.216.46/31	10.7.216.46 – 10.7.216.47	10.7.216.47
25	10.7.216.48/31	10.7.216.48 – 10.7.216.49	10.7.216.49
26	10.7.216.50/31	10.7.216.50 – 10.7.216.51	10.7.216.51
27	10.7.216.52/31	10.7.216.52 – 10.7.216.53	10.7.216.53
28	10.7.216.54/31	10.7.216.54 – 10.7.216.55	10.7.216.55
29	10.7.216.56/31	10.7.216.56 – 10.7.216.57	10.7.216.57
30	10.7.216.58/31	10.7.216.58 – 10.7.216.59	10.7.216.59
31	10.7.216.60/31	10.7.216.60 – 10.7.216.61	10.7.216.61
32	10.7.216.62/31	10.7.216.62 – 10.7.216.63	10.7.216.63
33	10.7.216.64/31	10.7.216.64 – 10.7.216.65	10.7.216.65
34	10.7.216.66/31	10.7.216.66 – 10.7.216.67	10.7.216.67
35	10.7.216.68/31	10.7.216.68 – 10.7.216.69	10.7.216.69
36	10.7.216.70/31	10.7.216.70 – 10.7.216.71	10.7.216.71
37	10.7.216.72/31	10.7.216.72 – 10.7.216.73	10.7.216.73
38	10.7.216.74/31	10.7.216.74 – 10.7.216.75	10.7.216.75
39	10.7.216.76/31	10.7.216.76 – 10.7.216.77	10.7.216.77
40	10.7.216.78/31	10.7.216.78 – 10.7.216.79	10.7.216.79
41	10.7.216.80/31	10.7.216.80 – 10.7.216.81	10.7.216.81
42	10.7.216.82/31	10.7.216.82 – 10.7.216.83	10.7.216.83
43	10.7.216.84/31	10.7.216.84 – 10.7.216.85	10.7.216.85
44	10.7.216.86/31	10.7.216.86 – 10.7.216.87	10.7.216.87
45	10.7.216.88/31	10.7.216.88 – 10.7.216.89	10.7.216.89
46	10.7.216.90/31	10.7.216.90 – 10.7.216.91	10.7.216.91
47	10.7.216.92/31	10.7.216.92 – 10.7.216.93	10.7.216.93
48	10.7.216.94/31	10.7.216.94 – 10.7.216.95	10.7.216.95
49	10.7.216.96/31	10.7.216.96 – 10.7.216.97	10.7.216.97
50	10.7.216.98/31	10.7.216.98 – 10.7.216.99	10.7.216.99
51	10.7.216.100/31	10.7.216.100 – 10.7.216.101	10.7.216.101
52	10.7.216.102/31	10.7.216.102 – 10.7.216.103	10.7.216.103
53	10.7.216.104/31	10.7.216.104 – 10.7.216.105	10.7.216.105
54	10.7.216.106/31	10.7.216.106 – 10.7.216.107	10.7.216.107
55	10.7.216.108/31	10.7.216.108 – 10.7.216.109	10.7.216.109
56	10.7.216.110/31	10.7.216.110 – 10.7.216.111	10.7.216.111
57	10.7.216.112/31	10.7.216.112 – 10.7.216.113	10.7.216.113
58	10.7.216.114/31	10.7.216.114 – 10.7.216.115	10.7.216.115
59	10.7.216.116/31	10.7.216.116 – 10.7.216.117	10.7.216.117
60	10.7.216.118/31	10.7.216.118 – 10.7.216.119	10.7.216.119
61	10.7.216.120/31	10.7.216.120 – 10.7.216.121	10.7.216.121
62	10.7.216.122/31	10.7.216.122 – 10.7.216.123	10.7.216.123
63	10.7.216.124/31	10.7.216.124 – 10.7.216.125	10.7.216.125
64	10.7.216.126/31	10.7.216.126 – 10.7.216.127	10.7.216.127
65	10.7.216.128/31	10.7.216.128 – 10.7.216.129	10.7.216.129
66	10.7.216.130/31	10.7.216.130 – 10.7.216.131	10.7.216.131
67	10.7.216.132/31	10.7.216.132 – 10.7.216.133	10.7.216.133
68	10.7.216.134/31	10.7.216.134 – 10.7.216.135	10.7.216.135
69	10.7.216.136/31	10.7.216.136 – 10.7.216.137	10.7.216.137
70	10.7.216.138/31	10.7.216.138 – 10.7.216.139	10.7.216.139
71	10.7.216.140/31	10.7.216.140 – 10.7.216.141	10.7.216.141
72	10.7.216.142/31	10.7.216.142 – 10.7.216.143	10.7.216.143
73	10.7.216.144/31	10.7.216.144 – 10.7.216.145	10.7.216.145
74	10.7.216.146/31	10.7.216.146 – 10.7.216.147	10.7.216.147
75	10.7.216.148/31	10.7.216.148 – 10.7.216.149	10.7.216.149
76	10.7.216.150/31	10.7.216.150 – 10.7.216.151	10.7.216.151
77	10.7.216.152/31	10.7.216.152 – 10.7.216.153	10.7.216.153
78	10.7.216.154/31	10.7.216.154 – 10.7.216.155	10.7.216.155
79	10.7.216.156/31	10.7.216.156 – 10.7.216.157	10.7.216.157
80	10.7.216.158/31	10.7.216.158 – 10.7.216.159	10.7.216.159
81	10.7.216.160/31	10.7.216.160 – 10.7.216.161	10.7.216.161
82	10.7.216.162/31	10.7.216.162 – 10.7.216.163	10.7.216.163
83	10.7.216.164/31	10.7.216.164 – 10.7.216.165	10.7.216.165
84	10.7.216.166/31	10.7.216.166 – 10.7.216.167	10.7.216.167
85	10.7.216.168/31	10.7.216.168 – 10.7.216.169	10.7.216.169
86	10.7.216.170/31	10.7.216.170 – 10.7.216.171	10.7.216.171
87	10.7.216.172/31	10.7.216.172 – 10.7.216.173	10.7.216.173
88	10.7.216.174/31	10.7.216.174 – 10.7.216.175	10.7.216.175
89	10.7.216.176/31	10.7.216.176 – 10.7.216.177	10.7.216.177
90	10.7.216.178/31	10.7.216.178 – 10.7.216.179	10.7.216.179
91	10.7.216.180/31	10.7.216.180 – 10.7.216.181	10.7.216.181
92	10.7.216.182/31	10.7.216.182 – 10.7.216.183	10.7.216.183
93	10.7.216.184/31	10.7.216.184 – 10.7.216.185	10.7.216.185
94	10.7.216.186/31	10.7.216.186 – 10.7.216.187	10.7.216.187
95	10.7.216.188/31	10.7.216.188 – 10.7.216.189	10.7.216.189
96	10.7.216.190/31	10.7.216.190 – 10.7.216.191	10.7.216.191
97	10.7.216.192/31	10.7.216.192 – 10.7.216.193	10.7.216.193
98	10.7.216.194/31	10.7.216.194 – 10.7.216.195	10.7.216.195
99	10.7.216.196/31	10.7.216.196 – 10.7.216.197	10.7.216.197
100	10.7.216.198/31	10.7.216.198 – 10.7.216.199	10.7.216.199
101	10.7.216.200/31	10.7.216.200 – 10.7.216.201	10.7.216.201
102	10.7.216.202/31	10.7.216.202 – 10.7.216.203	10.7.216.203
103	10.7.216.204/31	10.7.216.204 – 10.7.216.205	10.7.216.205
104	10.7.216.206/31	10.7.216.206 – 10.7.216.207	10.7.216.207
105	10.7.216.208/31	10.7.216.208 – 10.7.216.209	10.7.216.209
106	10.7.216.210/31	10.7.216.210 – 10.7.216.211	10.7.216.211
107	10.7.216.212/31	10.7.216.212 – 10.7.216.213	10.7.216.213
108	10.7.216.214/31	10.7.216.214 – 10.7.216.215	10.7.216.215
109	10.7.216.216/31	10.7.216.216 – 10.7.216.217	10.7.216.217
110	10.7.216.218/31	10.7.216.218 – 10.7.216.219	10.7.216.219
111	10.7.216.220/31	10.7.216.220 – 10.7.216.221	10.7.216.221
112	10.7.216.222/31	10.7.216.222 – 10.7.216.223	10.7.216.223
113	10.7.216.224/31	10.7.216.224 – 10.7.216.225	10.7.216.225
114	10.7.216.226/31	10.7.216.226 – 10.7.216.227	10.7.216.227
115	10.7.216.228/31	10.7.216.228 – 10.7.216.229	10.7.216.229
116	10.7.216.230/31	10.7.216.230 – 10.7.216.231	10.7.216.231
117	10.7.216.232/31	10.7.216.232 – 10.7.216.233	10.7.216.233
118	10.7.216.234/31	10.7.216.234 – 10.7.216.235	10.7.216.235
119	10.7.216.236/31	10.7.216.236 – 10.7.216.237	10.7.216.237
120	10.7.216.238/31	10.7.216.238 – 10.7.216.239	10.7.216.239
121	10.7.216.240/31	10.7.216.240 – 10.7.216.241	10.7.216.241
122	10.7.216.242/31	10.7.216.242 – 10.7.216.243	10.7.216.243
123	10.7.216.244/31	10.7.216.244 – 10.7.216.245	10.7.216.245
124	10.7.216.246/31	10.7.216.246 – 10.7.216.247	10.7.216.247
125	10.7.216.248/31	10.7.216.248 – 10.7.216.249	10.7.216.249
126	10.7.216.250/31	10.7.216.250 – 10.7.216.251	10.7.216.251
127	10.7.216.252/31	10.7.216.252 – 10.7.216.253	10.7.216.253
128	10.7.216.254/31	10.7.216.254 – 10.7.216.255	10.7.216.255
129	10.7.217.0/31	10.7.217.0 – 10.7.217.1	10.7.217.1
130	10.7.217.2/31	10.7.217.2 – 10.7.217.3	10.7.217.3
131	10.7.217.4/31	10.7.217.4 – 10.7.217.5	10.7.217.5
132	10.7.217.6/31	10.7.217.6 – 10.7.217.7	10.7.217.7
133	10.7.217.8/31	10.7.217.8 – 10.7.217.9	10.7.217.9
134	10.7.217.10/31	10.7.217.10 – 10.7.217.11	10.7.217.11
135	10.7.217.12/31	10.7.217.12 – 10.7.217.13	10.7.217.13
136	10.7.217.14/31	10.7.217.14 – 10.7.217.15	10.7.217.15
137	10.7.217.16/31	10.7.217.16 – 10.7.217.17	10.7.217.17
138	10.7.217.18/31	10.7.217.18 – 10.7.217.19	10.7.217.19
139	10.7.217.20/31	10.7.217.20 – 10.7.217.21	10.7.217.21
140	10.7.217.22/31	10.7.217.22 – 10.7.217.23	10.7.217.23
141	10.7.217.24/31	10.7.217.24 – 10.7.217.25	10.7.217.25
142	10.7.217.26/31	10.7.217.26 – 10.7.217.27	10.7.217.27
143	10.7.217.28/31	10.7.217.28 – 10.7.217.29	10.7.217.29
144	10.7.217.30/31	10.7.217.30 – 10.7.217.31	10.7.217.31
145	10.7.217.32/31	10.7.217.32 – 10.7.217.33	10.7.217.33
146	10.7.217.34/31	10.7.217.34 – 10.7.217.35	10.7.217.35
147	10.7.217.36/31	10.7.217.36 – 10.7.217.37	10.7.217.37
148	10.7.217.38/31	10.7.217.38 – 10.7.217.39	10.7.217.39
149	10.7.217.40/31	10.7.217.40 – 10.7.217.41	10.7.217.41
150	10.7.217.42/31	10.7.217.42 – 10.7.217.43	10.7.217.43
151	10.7.217.44/31	10.7.217.44 – 10.7.217.45	10.7.217.45
152	10.7.217.46/31	10.7.217.46 – 10.7.217.47	10.7.217.47
153	10.7.217.48/31	10.7.217.48 – 10.7.217.49	10.7.217.49
154	10.7.217.50/31	10.7.217.50 – 10.7.217.51	10.7.217.51
155	10.7.217.52/31	10.7.217.52 – 10.7.217.53	10.7.217.53
156	10.7.217.54/31	10.7.217.54 – 10.7.217.55	10.7.217.55
157	10.7.217.56/31	10.7.217.56 – 10.7.217.57	10.7.217.57
158	10.7.217.58/31	10.7.217.58 – 10.7.217.59	10.7.217.59
159	10.7.217.60/31	10.7.217.60 – 10.7.217.61	10.7.217.61
160	10.7.217.62/31	10.7.217.62 – 10.7.217.63	10.7.217.63
161	10.7.217.64/31	10.7.217.64 – 10.7.217.65	10.7.217.65
162	10.7.217.66/31	10.7.217.66 – 10.7.217.67	10.7.217.67
163	10.7.217.68/31	10.7.217.68 – 10.7.217.69	10.7.217.69
164	10.7.217.70/31	10.7.217.70 – 10.7.217.71	10.7.217.71
165	10.7.217.72/31	10.7.217.72 – 10.7.217.73	10.7.217.73
166	10.7.217.74/31	10.7.217.74 – 10.7.217.75	10.7.217.75
167	10.7.217.76/31	10.7.217.76 – 10.7.217.77	10.7.217.77
168	10.7.217.78/31	10.7.217.78 – 10.7.217.79	10.7.217.79
169	10.7.217.80/31	10.7.217.80 – 10.7.217.81	10.7.217.81
170	10.7.217.82/31	10.7.217.82 – 10.7.217.83	10.7.217.83
171	10.7.217.84/31	10.7.217.84 – 10.7.217.85	10.7.217.85
172	10.7.217.86/31	10.7.217.86 – 10.7.217.87	10.7.217.87
173	10.7.217.88/31	10.7.217.88 – 10.7.217.89	10.7.217.89
174	10.7.217.90/31	10.7.217.90 – 10.7.217.91	10.7.217.91
175	10.7.217.92/31	10.7.217.92 – 10.7.217.93	10.7.217.93
176	10.7.217.94/31	10.7.217.94 – 10.7.217.95	10.7.217.95
177	10.7.217.96/31	10.7.217.96 – 10.7.217.97	10.7.217.97
178	10.7.217.98/31	10.7.217.98 – 10.7.217.99	10.7.217.99
179	10.7.217.100/31	10.7.217.100 – 10.7.217.101	10.7.217.101
180	10.7.217.102/31	10.7.217.102 – 10.7.217.103	10.7.217.103
181	10.7.217.104/31	10.7.217.104 – 10.7.217.105	10.7.217.105
182	10.7.217.106/31	10.7.217.106 – 10.7.217.107	10.7.217.107
183	10.7.217.108/31	10.7.217.108 – 10.7.217.109	10.7.217.109
184	10.7.217.110/31	10.7.217.110 – 10.7.217.111	10.7.217.111
185	10.7.217.112/31	10.7.217.112 – 10.7.217.113	10.7.217.113
186	10.7.217.114/31	10.7.217.114 – 10.7.217.115	10.7.217.115
187	10.7.217.116/31	10.7.217.116 – 10.7.217.117	10.7.217.117
188	10.7.217.118/31	10.7.217.118 – 10.7.217.119	10.7.217.119
189	10.7.217.120/31	10.7.217.120 – 10.7.217.121	10.7.217.121
190	10.7.217.122/31	10.7.217.122 – 10.7.217.123	10.7.217.123
191	10.7.217.124/31	10.7.217.124 – 10.7.217.125	10.7.217.125
192	10.7.217.126/31	10.7.217.126 – 10.7.217.127	10.7.217.127
193	10.7.217.128/31	10.7.217.128 – 10.7.217.129	10.7.217.129
194	10.7.217.130/31	10.7.217.130 – 10.7.217.131	10.7.217.131
195	10.7.217.132/31	10.7.217.132 – 10.7.217.133	10.7.217.133
196	10.7.217.134/31	10.7.217.134 – 10.7.217.135	10.7.217.135
197	10.7.217.136/31	10.7.217.136 – 10.7.217.137	10.7.217.137
198	10.7.217.138/31	10.7.217.138 – 10.7.217.139	10.7.217.139
199	10.7.217.140/31	10.7.217.140 – 10.7.217.141	10.7.217.141
200	10.7.217.142/31	10.7.217.142 – 10.7.217.143	10.7.217.143
201	10.7.217.144/31	10.7.217.144 – 10.7.217.145	10.7.217.145
202	10.7.217.146/31	10.7.217.146 – 10.7.217.147	10.7.217.147
203	10.7.217.148/31	10.7.217.148 – 10.7.217.149	10.7.217.149
204	10.7.217.150/31	10.7.217.150 – 10.7.217.151	10.7.217.151
205	10.7.217.152/31	10.7.217.152 – 10.7.217.153	10.7.217.153
206	10.7.217.154/31	10.7.217.154 – 10.7.217.155	10.7.217.155
207	10.7.217.156/31	10.7.217.156 – 10.7.217.157	10.7.217.157
208	10.7.217.158/31	10.7.217.158 – 10.7.217.159	10.7.217.159
209	10.7.217.160/31	10.7.217.160 – 10.7.217.161	10.7.217.161
210	10.7.217.162/31	10.7.217.162 – 10.7.217.163	10.7.217.163
211	10.7.217.164/31	10.7.217.164 – 10.7.217.165	10.7.217.165
212	10.7.217.166/31	10.7.217.166 – 10.7.217.167	10.7.217.167
213	10.7.217.168/31	10.7.217.168 – 10.7.217.169	10.7.217.169
214	10.7.217.170/31	10.7.217.170 – 10.7.217.171	10.7.217.171
215	10.7.217.172/31	10.7.217.172 – 10.7.217.173	10.7.217.173
216	10.7.217.174/31	10.7.217.174 – 10.7.217.175	10.7.217.175
217	10.7.217.176/31	10.7.217.176 – 10.7.217.177	10.7.217.177
218	10.7.217.178/31	10.7.217.178 – 10.7.217.179	10.7.217.179
219	10.7.217.180/31	10.7.217.180 – 10.7.217.181	10.7.217.181
220	10.7.217.182/31	10.7.217.182 – 10.7.217.183	10.7.217.183
221	10.7.217.184/31	10.7.217.184 – 10.7.217.185	10.7.217.185
222	10.7.217.186/31	10.7.217.186 – 10.7.217.187	10.7.217.187
223	10.7.217.188/31	10.7.217.188 – 10.7.217.189	10.7.217.189
224	10.7.217.190/31	10.7.217.190 – 10.7.217.191	10.7.217.191
225	10.7.217.192/31	10.7.217.192 – 10.7.217.193	10.7.217.193
226	10.7.217.194/31	10.7.217.194 – 10.7.217.195	10.7.217.195
227	10.7.217.196/31	10.7.217.196 – 10.7.217.197	10.7.217.197
228	10.7.217.198/31	10.7.217.198 – 10.7.217.199	10.7.217.199
229	10.7.217.200/31	10.7.217.200 – 10.7.217.201	10.7.217.201
230	10.7.217.202/31	10.7.217.202 – 10.7.217.203	10.7.217.203
231	10.7.217.204/31	10.7.217.204 – 10.7.217.205	10.7.217.205
232	10.7.217.206/31	10.7.217.206 – 10.7.217.207	10.7.217.207
233	10.7.217.208/31	10.7.217.208 – 10.7.217.209	10.7.217.209
234	10.7.217.210/31	10.7.217.210 – 10.7.217.211	10.7.217.211
235	10.7.217.212/31	10.7.217.212 – 10.7.217.213	10.7.217.213
236	10.7.217.214/31	10.7.217.214 – 10.7.217.215	10.7.217.215
237	10.7.217.216/31	10.7.217.216 – 10.7.217.217	10.7.217.217
238	10.7.217.218/31	10.7.217.218 – 10.7.217.219	10.7.217.219
239	10.7.217.220/31	10.7.217.220 – 10.7.217.221	10.7.217.221
240	10.7.217.222/31	10.7.217.222 – 10.7.217.223	10.7.217.223
241	10.7.217.224/31	10.7.217.224 – 10.7.217.225	10.7.217.225
242	10.7.217.226/31	10.7.217.226 – 10.7.217.227	10.7.217.227
243	10.7.217.228/31	10.7.217.228 – 10.7.217.229	10.7.217.229
244	10.7.217.230/31	10.7.217.230 – 10.7.217.231	10.7.217.231
245	10.7.217.232/31	10.7.217.232 – 10.7.217.233	10.7.217.233
246	10.7.217.234/31	10.7.217.234 – 10.7.217.235	10.7.217.235
247	10.7.217.236/31	10.7.217.236 – 10.7.217.237	10.7.217.237
248	10.7.217.238/31	10.7.217.238 – 10.7.217.239	10.7.217.239
249	10.7.217.240/31	10.7.217.240 – 10.7.217.241	10.7.217.241
250	10.7.217.242/31	10.7.217.242 – 10.7.217.243	10.7.217.243
251	10.7.217.244/31	10.7.217.244 – 10.7.217.245	10.7.217.245
252	10.7.217.246/31	10.7.217.246 – 10.7.217.247	10.7.217.247
253	10.7.217.248/31	10.7.217.248 – 10.7.217.249	10.7.217.249
254	10.7.217.250/31	10.7.217.250 – 10.7.217.251	10.7.217.251
255	10.7.217.252/31	10.7.217.252 – 10.7.217.253	10.7.217.253
256	10.7.217.254/31	10.7.217.254 – 10.7.217.255	10.7.217.255

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 →