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)10.0.216.0/21

network10.0.216.0/21

broadcast10.0.223.255

first host10.0.216.1

last host10.0.223.254

subnet mask255.255.248.0

wildcard0.0.7.255

addresses2,048

usable hosts2,046

classA

ipcalc 10.0.216.0/21

address00001010.00000000.11011000.00000000

subnet mask11111111.11111111.11111000.00000000

network00001010.00000000.11011000.00000000

broadcast00001010.00000000.11011111.11111111

green = network part, grey = host part

hex0x0a00d800

decimal167827456

reverse dns0.216.0.10.in-addr.arpa

ipv4-mapped::ffff:a00:d800

/21 split into /32 · 2,048 subnets

close ×

#	network	host range	broadcast
1	10.0.216.0/32	10.0.216.0 – 10.0.216.0	10.0.216.0
2	10.0.216.1/32	10.0.216.1 – 10.0.216.1	10.0.216.1
3	10.0.216.2/32	10.0.216.2 – 10.0.216.2	10.0.216.2
4	10.0.216.3/32	10.0.216.3 – 10.0.216.3	10.0.216.3
5	10.0.216.4/32	10.0.216.4 – 10.0.216.4	10.0.216.4
6	10.0.216.5/32	10.0.216.5 – 10.0.216.5	10.0.216.5
7	10.0.216.6/32	10.0.216.6 – 10.0.216.6	10.0.216.6
8	10.0.216.7/32	10.0.216.7 – 10.0.216.7	10.0.216.7
9	10.0.216.8/32	10.0.216.8 – 10.0.216.8	10.0.216.8
10	10.0.216.9/32	10.0.216.9 – 10.0.216.9	10.0.216.9
11	10.0.216.10/32	10.0.216.10 – 10.0.216.10	10.0.216.10
12	10.0.216.11/32	10.0.216.11 – 10.0.216.11	10.0.216.11
13	10.0.216.12/32	10.0.216.12 – 10.0.216.12	10.0.216.12
14	10.0.216.13/32	10.0.216.13 – 10.0.216.13	10.0.216.13
15	10.0.216.14/32	10.0.216.14 – 10.0.216.14	10.0.216.14
16	10.0.216.15/32	10.0.216.15 – 10.0.216.15	10.0.216.15
17	10.0.216.16/32	10.0.216.16 – 10.0.216.16	10.0.216.16
18	10.0.216.17/32	10.0.216.17 – 10.0.216.17	10.0.216.17
19	10.0.216.18/32	10.0.216.18 – 10.0.216.18	10.0.216.18
20	10.0.216.19/32	10.0.216.19 – 10.0.216.19	10.0.216.19
21	10.0.216.20/32	10.0.216.20 – 10.0.216.20	10.0.216.20
22	10.0.216.21/32	10.0.216.21 – 10.0.216.21	10.0.216.21
23	10.0.216.22/32	10.0.216.22 – 10.0.216.22	10.0.216.22
24	10.0.216.23/32	10.0.216.23 – 10.0.216.23	10.0.216.23
25	10.0.216.24/32	10.0.216.24 – 10.0.216.24	10.0.216.24
26	10.0.216.25/32	10.0.216.25 – 10.0.216.25	10.0.216.25
27	10.0.216.26/32	10.0.216.26 – 10.0.216.26	10.0.216.26
28	10.0.216.27/32	10.0.216.27 – 10.0.216.27	10.0.216.27
29	10.0.216.28/32	10.0.216.28 – 10.0.216.28	10.0.216.28
30	10.0.216.29/32	10.0.216.29 – 10.0.216.29	10.0.216.29
31	10.0.216.30/32	10.0.216.30 – 10.0.216.30	10.0.216.30
32	10.0.216.31/32	10.0.216.31 – 10.0.216.31	10.0.216.31
33	10.0.216.32/32	10.0.216.32 – 10.0.216.32	10.0.216.32
34	10.0.216.33/32	10.0.216.33 – 10.0.216.33	10.0.216.33
35	10.0.216.34/32	10.0.216.34 – 10.0.216.34	10.0.216.34
36	10.0.216.35/32	10.0.216.35 – 10.0.216.35	10.0.216.35
37	10.0.216.36/32	10.0.216.36 – 10.0.216.36	10.0.216.36
38	10.0.216.37/32	10.0.216.37 – 10.0.216.37	10.0.216.37
39	10.0.216.38/32	10.0.216.38 – 10.0.216.38	10.0.216.38
40	10.0.216.39/32	10.0.216.39 – 10.0.216.39	10.0.216.39
41	10.0.216.40/32	10.0.216.40 – 10.0.216.40	10.0.216.40
42	10.0.216.41/32	10.0.216.41 – 10.0.216.41	10.0.216.41
43	10.0.216.42/32	10.0.216.42 – 10.0.216.42	10.0.216.42
44	10.0.216.43/32	10.0.216.43 – 10.0.216.43	10.0.216.43
45	10.0.216.44/32	10.0.216.44 – 10.0.216.44	10.0.216.44
46	10.0.216.45/32	10.0.216.45 – 10.0.216.45	10.0.216.45
47	10.0.216.46/32	10.0.216.46 – 10.0.216.46	10.0.216.46
48	10.0.216.47/32	10.0.216.47 – 10.0.216.47	10.0.216.47
49	10.0.216.48/32	10.0.216.48 – 10.0.216.48	10.0.216.48
50	10.0.216.49/32	10.0.216.49 – 10.0.216.49	10.0.216.49
51	10.0.216.50/32	10.0.216.50 – 10.0.216.50	10.0.216.50
52	10.0.216.51/32	10.0.216.51 – 10.0.216.51	10.0.216.51
53	10.0.216.52/32	10.0.216.52 – 10.0.216.52	10.0.216.52
54	10.0.216.53/32	10.0.216.53 – 10.0.216.53	10.0.216.53
55	10.0.216.54/32	10.0.216.54 – 10.0.216.54	10.0.216.54
56	10.0.216.55/32	10.0.216.55 – 10.0.216.55	10.0.216.55
57	10.0.216.56/32	10.0.216.56 – 10.0.216.56	10.0.216.56
58	10.0.216.57/32	10.0.216.57 – 10.0.216.57	10.0.216.57
59	10.0.216.58/32	10.0.216.58 – 10.0.216.58	10.0.216.58
60	10.0.216.59/32	10.0.216.59 – 10.0.216.59	10.0.216.59
61	10.0.216.60/32	10.0.216.60 – 10.0.216.60	10.0.216.60
62	10.0.216.61/32	10.0.216.61 – 10.0.216.61	10.0.216.61
63	10.0.216.62/32	10.0.216.62 – 10.0.216.62	10.0.216.62
64	10.0.216.63/32	10.0.216.63 – 10.0.216.63	10.0.216.63
65	10.0.216.64/32	10.0.216.64 – 10.0.216.64	10.0.216.64
66	10.0.216.65/32	10.0.216.65 – 10.0.216.65	10.0.216.65
67	10.0.216.66/32	10.0.216.66 – 10.0.216.66	10.0.216.66
68	10.0.216.67/32	10.0.216.67 – 10.0.216.67	10.0.216.67
69	10.0.216.68/32	10.0.216.68 – 10.0.216.68	10.0.216.68
70	10.0.216.69/32	10.0.216.69 – 10.0.216.69	10.0.216.69
71	10.0.216.70/32	10.0.216.70 – 10.0.216.70	10.0.216.70
72	10.0.216.71/32	10.0.216.71 – 10.0.216.71	10.0.216.71
73	10.0.216.72/32	10.0.216.72 – 10.0.216.72	10.0.216.72
74	10.0.216.73/32	10.0.216.73 – 10.0.216.73	10.0.216.73
75	10.0.216.74/32	10.0.216.74 – 10.0.216.74	10.0.216.74
76	10.0.216.75/32	10.0.216.75 – 10.0.216.75	10.0.216.75
77	10.0.216.76/32	10.0.216.76 – 10.0.216.76	10.0.216.76
78	10.0.216.77/32	10.0.216.77 – 10.0.216.77	10.0.216.77
79	10.0.216.78/32	10.0.216.78 – 10.0.216.78	10.0.216.78
80	10.0.216.79/32	10.0.216.79 – 10.0.216.79	10.0.216.79
81	10.0.216.80/32	10.0.216.80 – 10.0.216.80	10.0.216.80
82	10.0.216.81/32	10.0.216.81 – 10.0.216.81	10.0.216.81
83	10.0.216.82/32	10.0.216.82 – 10.0.216.82	10.0.216.82
84	10.0.216.83/32	10.0.216.83 – 10.0.216.83	10.0.216.83
85	10.0.216.84/32	10.0.216.84 – 10.0.216.84	10.0.216.84
86	10.0.216.85/32	10.0.216.85 – 10.0.216.85	10.0.216.85
87	10.0.216.86/32	10.0.216.86 – 10.0.216.86	10.0.216.86
88	10.0.216.87/32	10.0.216.87 – 10.0.216.87	10.0.216.87
89	10.0.216.88/32	10.0.216.88 – 10.0.216.88	10.0.216.88
90	10.0.216.89/32	10.0.216.89 – 10.0.216.89	10.0.216.89
91	10.0.216.90/32	10.0.216.90 – 10.0.216.90	10.0.216.90
92	10.0.216.91/32	10.0.216.91 – 10.0.216.91	10.0.216.91
93	10.0.216.92/32	10.0.216.92 – 10.0.216.92	10.0.216.92
94	10.0.216.93/32	10.0.216.93 – 10.0.216.93	10.0.216.93
95	10.0.216.94/32	10.0.216.94 – 10.0.216.94	10.0.216.94
96	10.0.216.95/32	10.0.216.95 – 10.0.216.95	10.0.216.95
97	10.0.216.96/32	10.0.216.96 – 10.0.216.96	10.0.216.96
98	10.0.216.97/32	10.0.216.97 – 10.0.216.97	10.0.216.97
99	10.0.216.98/32	10.0.216.98 – 10.0.216.98	10.0.216.98
100	10.0.216.99/32	10.0.216.99 – 10.0.216.99	10.0.216.99
101	10.0.216.100/32	10.0.216.100 – 10.0.216.100	10.0.216.100
102	10.0.216.101/32	10.0.216.101 – 10.0.216.101	10.0.216.101
103	10.0.216.102/32	10.0.216.102 – 10.0.216.102	10.0.216.102
104	10.0.216.103/32	10.0.216.103 – 10.0.216.103	10.0.216.103
105	10.0.216.104/32	10.0.216.104 – 10.0.216.104	10.0.216.104
106	10.0.216.105/32	10.0.216.105 – 10.0.216.105	10.0.216.105
107	10.0.216.106/32	10.0.216.106 – 10.0.216.106	10.0.216.106
108	10.0.216.107/32	10.0.216.107 – 10.0.216.107	10.0.216.107
109	10.0.216.108/32	10.0.216.108 – 10.0.216.108	10.0.216.108
110	10.0.216.109/32	10.0.216.109 – 10.0.216.109	10.0.216.109
111	10.0.216.110/32	10.0.216.110 – 10.0.216.110	10.0.216.110
112	10.0.216.111/32	10.0.216.111 – 10.0.216.111	10.0.216.111
113	10.0.216.112/32	10.0.216.112 – 10.0.216.112	10.0.216.112
114	10.0.216.113/32	10.0.216.113 – 10.0.216.113	10.0.216.113
115	10.0.216.114/32	10.0.216.114 – 10.0.216.114	10.0.216.114
116	10.0.216.115/32	10.0.216.115 – 10.0.216.115	10.0.216.115
117	10.0.216.116/32	10.0.216.116 – 10.0.216.116	10.0.216.116
118	10.0.216.117/32	10.0.216.117 – 10.0.216.117	10.0.216.117
119	10.0.216.118/32	10.0.216.118 – 10.0.216.118	10.0.216.118
120	10.0.216.119/32	10.0.216.119 – 10.0.216.119	10.0.216.119
121	10.0.216.120/32	10.0.216.120 – 10.0.216.120	10.0.216.120
122	10.0.216.121/32	10.0.216.121 – 10.0.216.121	10.0.216.121
123	10.0.216.122/32	10.0.216.122 – 10.0.216.122	10.0.216.122
124	10.0.216.123/32	10.0.216.123 – 10.0.216.123	10.0.216.123
125	10.0.216.124/32	10.0.216.124 – 10.0.216.124	10.0.216.124
126	10.0.216.125/32	10.0.216.125 – 10.0.216.125	10.0.216.125
127	10.0.216.126/32	10.0.216.126 – 10.0.216.126	10.0.216.126
128	10.0.216.127/32	10.0.216.127 – 10.0.216.127	10.0.216.127
129	10.0.216.128/32	10.0.216.128 – 10.0.216.128	10.0.216.128
130	10.0.216.129/32	10.0.216.129 – 10.0.216.129	10.0.216.129
131	10.0.216.130/32	10.0.216.130 – 10.0.216.130	10.0.216.130
132	10.0.216.131/32	10.0.216.131 – 10.0.216.131	10.0.216.131
133	10.0.216.132/32	10.0.216.132 – 10.0.216.132	10.0.216.132
134	10.0.216.133/32	10.0.216.133 – 10.0.216.133	10.0.216.133
135	10.0.216.134/32	10.0.216.134 – 10.0.216.134	10.0.216.134
136	10.0.216.135/32	10.0.216.135 – 10.0.216.135	10.0.216.135
137	10.0.216.136/32	10.0.216.136 – 10.0.216.136	10.0.216.136
138	10.0.216.137/32	10.0.216.137 – 10.0.216.137	10.0.216.137
139	10.0.216.138/32	10.0.216.138 – 10.0.216.138	10.0.216.138
140	10.0.216.139/32	10.0.216.139 – 10.0.216.139	10.0.216.139
141	10.0.216.140/32	10.0.216.140 – 10.0.216.140	10.0.216.140
142	10.0.216.141/32	10.0.216.141 – 10.0.216.141	10.0.216.141
143	10.0.216.142/32	10.0.216.142 – 10.0.216.142	10.0.216.142
144	10.0.216.143/32	10.0.216.143 – 10.0.216.143	10.0.216.143
145	10.0.216.144/32	10.0.216.144 – 10.0.216.144	10.0.216.144
146	10.0.216.145/32	10.0.216.145 – 10.0.216.145	10.0.216.145
147	10.0.216.146/32	10.0.216.146 – 10.0.216.146	10.0.216.146
148	10.0.216.147/32	10.0.216.147 – 10.0.216.147	10.0.216.147
149	10.0.216.148/32	10.0.216.148 – 10.0.216.148	10.0.216.148
150	10.0.216.149/32	10.0.216.149 – 10.0.216.149	10.0.216.149
151	10.0.216.150/32	10.0.216.150 – 10.0.216.150	10.0.216.150
152	10.0.216.151/32	10.0.216.151 – 10.0.216.151	10.0.216.151
153	10.0.216.152/32	10.0.216.152 – 10.0.216.152	10.0.216.152
154	10.0.216.153/32	10.0.216.153 – 10.0.216.153	10.0.216.153
155	10.0.216.154/32	10.0.216.154 – 10.0.216.154	10.0.216.154
156	10.0.216.155/32	10.0.216.155 – 10.0.216.155	10.0.216.155
157	10.0.216.156/32	10.0.216.156 – 10.0.216.156	10.0.216.156
158	10.0.216.157/32	10.0.216.157 – 10.0.216.157	10.0.216.157
159	10.0.216.158/32	10.0.216.158 – 10.0.216.158	10.0.216.158
160	10.0.216.159/32	10.0.216.159 – 10.0.216.159	10.0.216.159
161	10.0.216.160/32	10.0.216.160 – 10.0.216.160	10.0.216.160
162	10.0.216.161/32	10.0.216.161 – 10.0.216.161	10.0.216.161
163	10.0.216.162/32	10.0.216.162 – 10.0.216.162	10.0.216.162
164	10.0.216.163/32	10.0.216.163 – 10.0.216.163	10.0.216.163
165	10.0.216.164/32	10.0.216.164 – 10.0.216.164	10.0.216.164
166	10.0.216.165/32	10.0.216.165 – 10.0.216.165	10.0.216.165
167	10.0.216.166/32	10.0.216.166 – 10.0.216.166	10.0.216.166
168	10.0.216.167/32	10.0.216.167 – 10.0.216.167	10.0.216.167
169	10.0.216.168/32	10.0.216.168 – 10.0.216.168	10.0.216.168
170	10.0.216.169/32	10.0.216.169 – 10.0.216.169	10.0.216.169
171	10.0.216.170/32	10.0.216.170 – 10.0.216.170	10.0.216.170
172	10.0.216.171/32	10.0.216.171 – 10.0.216.171	10.0.216.171
173	10.0.216.172/32	10.0.216.172 – 10.0.216.172	10.0.216.172
174	10.0.216.173/32	10.0.216.173 – 10.0.216.173	10.0.216.173
175	10.0.216.174/32	10.0.216.174 – 10.0.216.174	10.0.216.174
176	10.0.216.175/32	10.0.216.175 – 10.0.216.175	10.0.216.175
177	10.0.216.176/32	10.0.216.176 – 10.0.216.176	10.0.216.176
178	10.0.216.177/32	10.0.216.177 – 10.0.216.177	10.0.216.177
179	10.0.216.178/32	10.0.216.178 – 10.0.216.178	10.0.216.178
180	10.0.216.179/32	10.0.216.179 – 10.0.216.179	10.0.216.179
181	10.0.216.180/32	10.0.216.180 – 10.0.216.180	10.0.216.180
182	10.0.216.181/32	10.0.216.181 – 10.0.216.181	10.0.216.181
183	10.0.216.182/32	10.0.216.182 – 10.0.216.182	10.0.216.182
184	10.0.216.183/32	10.0.216.183 – 10.0.216.183	10.0.216.183
185	10.0.216.184/32	10.0.216.184 – 10.0.216.184	10.0.216.184
186	10.0.216.185/32	10.0.216.185 – 10.0.216.185	10.0.216.185
187	10.0.216.186/32	10.0.216.186 – 10.0.216.186	10.0.216.186
188	10.0.216.187/32	10.0.216.187 – 10.0.216.187	10.0.216.187
189	10.0.216.188/32	10.0.216.188 – 10.0.216.188	10.0.216.188
190	10.0.216.189/32	10.0.216.189 – 10.0.216.189	10.0.216.189
191	10.0.216.190/32	10.0.216.190 – 10.0.216.190	10.0.216.190
192	10.0.216.191/32	10.0.216.191 – 10.0.216.191	10.0.216.191
193	10.0.216.192/32	10.0.216.192 – 10.0.216.192	10.0.216.192
194	10.0.216.193/32	10.0.216.193 – 10.0.216.193	10.0.216.193
195	10.0.216.194/32	10.0.216.194 – 10.0.216.194	10.0.216.194
196	10.0.216.195/32	10.0.216.195 – 10.0.216.195	10.0.216.195
197	10.0.216.196/32	10.0.216.196 – 10.0.216.196	10.0.216.196
198	10.0.216.197/32	10.0.216.197 – 10.0.216.197	10.0.216.197
199	10.0.216.198/32	10.0.216.198 – 10.0.216.198	10.0.216.198
200	10.0.216.199/32	10.0.216.199 – 10.0.216.199	10.0.216.199
201	10.0.216.200/32	10.0.216.200 – 10.0.216.200	10.0.216.200
202	10.0.216.201/32	10.0.216.201 – 10.0.216.201	10.0.216.201
203	10.0.216.202/32	10.0.216.202 – 10.0.216.202	10.0.216.202
204	10.0.216.203/32	10.0.216.203 – 10.0.216.203	10.0.216.203
205	10.0.216.204/32	10.0.216.204 – 10.0.216.204	10.0.216.204
206	10.0.216.205/32	10.0.216.205 – 10.0.216.205	10.0.216.205
207	10.0.216.206/32	10.0.216.206 – 10.0.216.206	10.0.216.206
208	10.0.216.207/32	10.0.216.207 – 10.0.216.207	10.0.216.207
209	10.0.216.208/32	10.0.216.208 – 10.0.216.208	10.0.216.208
210	10.0.216.209/32	10.0.216.209 – 10.0.216.209	10.0.216.209
211	10.0.216.210/32	10.0.216.210 – 10.0.216.210	10.0.216.210
212	10.0.216.211/32	10.0.216.211 – 10.0.216.211	10.0.216.211
213	10.0.216.212/32	10.0.216.212 – 10.0.216.212	10.0.216.212
214	10.0.216.213/32	10.0.216.213 – 10.0.216.213	10.0.216.213
215	10.0.216.214/32	10.0.216.214 – 10.0.216.214	10.0.216.214
216	10.0.216.215/32	10.0.216.215 – 10.0.216.215	10.0.216.215
217	10.0.216.216/32	10.0.216.216 – 10.0.216.216	10.0.216.216
218	10.0.216.217/32	10.0.216.217 – 10.0.216.217	10.0.216.217
219	10.0.216.218/32	10.0.216.218 – 10.0.216.218	10.0.216.218
220	10.0.216.219/32	10.0.216.219 – 10.0.216.219	10.0.216.219
221	10.0.216.220/32	10.0.216.220 – 10.0.216.220	10.0.216.220
222	10.0.216.221/32	10.0.216.221 – 10.0.216.221	10.0.216.221
223	10.0.216.222/32	10.0.216.222 – 10.0.216.222	10.0.216.222
224	10.0.216.223/32	10.0.216.223 – 10.0.216.223	10.0.216.223
225	10.0.216.224/32	10.0.216.224 – 10.0.216.224	10.0.216.224
226	10.0.216.225/32	10.0.216.225 – 10.0.216.225	10.0.216.225
227	10.0.216.226/32	10.0.216.226 – 10.0.216.226	10.0.216.226
228	10.0.216.227/32	10.0.216.227 – 10.0.216.227	10.0.216.227
229	10.0.216.228/32	10.0.216.228 – 10.0.216.228	10.0.216.228
230	10.0.216.229/32	10.0.216.229 – 10.0.216.229	10.0.216.229
231	10.0.216.230/32	10.0.216.230 – 10.0.216.230	10.0.216.230
232	10.0.216.231/32	10.0.216.231 – 10.0.216.231	10.0.216.231
233	10.0.216.232/32	10.0.216.232 – 10.0.216.232	10.0.216.232
234	10.0.216.233/32	10.0.216.233 – 10.0.216.233	10.0.216.233
235	10.0.216.234/32	10.0.216.234 – 10.0.216.234	10.0.216.234
236	10.0.216.235/32	10.0.216.235 – 10.0.216.235	10.0.216.235
237	10.0.216.236/32	10.0.216.236 – 10.0.216.236	10.0.216.236
238	10.0.216.237/32	10.0.216.237 – 10.0.216.237	10.0.216.237
239	10.0.216.238/32	10.0.216.238 – 10.0.216.238	10.0.216.238
240	10.0.216.239/32	10.0.216.239 – 10.0.216.239	10.0.216.239
241	10.0.216.240/32	10.0.216.240 – 10.0.216.240	10.0.216.240
242	10.0.216.241/32	10.0.216.241 – 10.0.216.241	10.0.216.241
243	10.0.216.242/32	10.0.216.242 – 10.0.216.242	10.0.216.242
244	10.0.216.243/32	10.0.216.243 – 10.0.216.243	10.0.216.243
245	10.0.216.244/32	10.0.216.244 – 10.0.216.244	10.0.216.244
246	10.0.216.245/32	10.0.216.245 – 10.0.216.245	10.0.216.245
247	10.0.216.246/32	10.0.216.246 – 10.0.216.246	10.0.216.246
248	10.0.216.247/32	10.0.216.247 – 10.0.216.247	10.0.216.247
249	10.0.216.248/32	10.0.216.248 – 10.0.216.248	10.0.216.248
250	10.0.216.249/32	10.0.216.249 – 10.0.216.249	10.0.216.249
251	10.0.216.250/32	10.0.216.250 – 10.0.216.250	10.0.216.250
252	10.0.216.251/32	10.0.216.251 – 10.0.216.251	10.0.216.251
253	10.0.216.252/32	10.0.216.252 – 10.0.216.252	10.0.216.252
254	10.0.216.253/32	10.0.216.253 – 10.0.216.253	10.0.216.253
255	10.0.216.254/32	10.0.216.254 – 10.0.216.254	10.0.216.254
256	10.0.216.255/32	10.0.216.255 – 10.0.216.255	10.0.216.255

showing 256 of 2,048

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 →