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)10.0.20.0/22

network10.0.20.0/22

broadcast10.0.23.255

first host10.0.20.1

last host10.0.23.254

subnet mask255.255.252.0

wildcard0.0.3.255

addresses1,024

usable hosts1,022

classA

ipcalc 10.0.20.0/22

address00001010.00000000.00010100.00000000

subnet mask11111111.11111111.11111100.00000000

network00001010.00000000.00010100.00000000

broadcast00001010.00000000.00010111.11111111

green = network part, grey = host part

hex0x0a001400

decimal167777280

reverse dns0.20.0.10.in-addr.arpa

ipv4-mapped::ffff:a00:1400

/22 split into /32 · 1,024 subnets

close ×

#	network	host range	broadcast
1	10.0.20.0/32	10.0.20.0 – 10.0.20.0	10.0.20.0
2	10.0.20.1/32	10.0.20.1 – 10.0.20.1	10.0.20.1
3	10.0.20.2/32	10.0.20.2 – 10.0.20.2	10.0.20.2
4	10.0.20.3/32	10.0.20.3 – 10.0.20.3	10.0.20.3
5	10.0.20.4/32	10.0.20.4 – 10.0.20.4	10.0.20.4
6	10.0.20.5/32	10.0.20.5 – 10.0.20.5	10.0.20.5
7	10.0.20.6/32	10.0.20.6 – 10.0.20.6	10.0.20.6
8	10.0.20.7/32	10.0.20.7 – 10.0.20.7	10.0.20.7
9	10.0.20.8/32	10.0.20.8 – 10.0.20.8	10.0.20.8
10	10.0.20.9/32	10.0.20.9 – 10.0.20.9	10.0.20.9
11	10.0.20.10/32	10.0.20.10 – 10.0.20.10	10.0.20.10
12	10.0.20.11/32	10.0.20.11 – 10.0.20.11	10.0.20.11
13	10.0.20.12/32	10.0.20.12 – 10.0.20.12	10.0.20.12
14	10.0.20.13/32	10.0.20.13 – 10.0.20.13	10.0.20.13
15	10.0.20.14/32	10.0.20.14 – 10.0.20.14	10.0.20.14
16	10.0.20.15/32	10.0.20.15 – 10.0.20.15	10.0.20.15
17	10.0.20.16/32	10.0.20.16 – 10.0.20.16	10.0.20.16
18	10.0.20.17/32	10.0.20.17 – 10.0.20.17	10.0.20.17
19	10.0.20.18/32	10.0.20.18 – 10.0.20.18	10.0.20.18
20	10.0.20.19/32	10.0.20.19 – 10.0.20.19	10.0.20.19
21	10.0.20.20/32	10.0.20.20 – 10.0.20.20	10.0.20.20
22	10.0.20.21/32	10.0.20.21 – 10.0.20.21	10.0.20.21
23	10.0.20.22/32	10.0.20.22 – 10.0.20.22	10.0.20.22
24	10.0.20.23/32	10.0.20.23 – 10.0.20.23	10.0.20.23
25	10.0.20.24/32	10.0.20.24 – 10.0.20.24	10.0.20.24
26	10.0.20.25/32	10.0.20.25 – 10.0.20.25	10.0.20.25
27	10.0.20.26/32	10.0.20.26 – 10.0.20.26	10.0.20.26
28	10.0.20.27/32	10.0.20.27 – 10.0.20.27	10.0.20.27
29	10.0.20.28/32	10.0.20.28 – 10.0.20.28	10.0.20.28
30	10.0.20.29/32	10.0.20.29 – 10.0.20.29	10.0.20.29
31	10.0.20.30/32	10.0.20.30 – 10.0.20.30	10.0.20.30
32	10.0.20.31/32	10.0.20.31 – 10.0.20.31	10.0.20.31
33	10.0.20.32/32	10.0.20.32 – 10.0.20.32	10.0.20.32
34	10.0.20.33/32	10.0.20.33 – 10.0.20.33	10.0.20.33
35	10.0.20.34/32	10.0.20.34 – 10.0.20.34	10.0.20.34
36	10.0.20.35/32	10.0.20.35 – 10.0.20.35	10.0.20.35
37	10.0.20.36/32	10.0.20.36 – 10.0.20.36	10.0.20.36
38	10.0.20.37/32	10.0.20.37 – 10.0.20.37	10.0.20.37
39	10.0.20.38/32	10.0.20.38 – 10.0.20.38	10.0.20.38
40	10.0.20.39/32	10.0.20.39 – 10.0.20.39	10.0.20.39
41	10.0.20.40/32	10.0.20.40 – 10.0.20.40	10.0.20.40
42	10.0.20.41/32	10.0.20.41 – 10.0.20.41	10.0.20.41
43	10.0.20.42/32	10.0.20.42 – 10.0.20.42	10.0.20.42
44	10.0.20.43/32	10.0.20.43 – 10.0.20.43	10.0.20.43
45	10.0.20.44/32	10.0.20.44 – 10.0.20.44	10.0.20.44
46	10.0.20.45/32	10.0.20.45 – 10.0.20.45	10.0.20.45
47	10.0.20.46/32	10.0.20.46 – 10.0.20.46	10.0.20.46
48	10.0.20.47/32	10.0.20.47 – 10.0.20.47	10.0.20.47
49	10.0.20.48/32	10.0.20.48 – 10.0.20.48	10.0.20.48
50	10.0.20.49/32	10.0.20.49 – 10.0.20.49	10.0.20.49
51	10.0.20.50/32	10.0.20.50 – 10.0.20.50	10.0.20.50
52	10.0.20.51/32	10.0.20.51 – 10.0.20.51	10.0.20.51
53	10.0.20.52/32	10.0.20.52 – 10.0.20.52	10.0.20.52
54	10.0.20.53/32	10.0.20.53 – 10.0.20.53	10.0.20.53
55	10.0.20.54/32	10.0.20.54 – 10.0.20.54	10.0.20.54
56	10.0.20.55/32	10.0.20.55 – 10.0.20.55	10.0.20.55
57	10.0.20.56/32	10.0.20.56 – 10.0.20.56	10.0.20.56
58	10.0.20.57/32	10.0.20.57 – 10.0.20.57	10.0.20.57
59	10.0.20.58/32	10.0.20.58 – 10.0.20.58	10.0.20.58
60	10.0.20.59/32	10.0.20.59 – 10.0.20.59	10.0.20.59
61	10.0.20.60/32	10.0.20.60 – 10.0.20.60	10.0.20.60
62	10.0.20.61/32	10.0.20.61 – 10.0.20.61	10.0.20.61
63	10.0.20.62/32	10.0.20.62 – 10.0.20.62	10.0.20.62
64	10.0.20.63/32	10.0.20.63 – 10.0.20.63	10.0.20.63
65	10.0.20.64/32	10.0.20.64 – 10.0.20.64	10.0.20.64
66	10.0.20.65/32	10.0.20.65 – 10.0.20.65	10.0.20.65
67	10.0.20.66/32	10.0.20.66 – 10.0.20.66	10.0.20.66
68	10.0.20.67/32	10.0.20.67 – 10.0.20.67	10.0.20.67
69	10.0.20.68/32	10.0.20.68 – 10.0.20.68	10.0.20.68
70	10.0.20.69/32	10.0.20.69 – 10.0.20.69	10.0.20.69
71	10.0.20.70/32	10.0.20.70 – 10.0.20.70	10.0.20.70
72	10.0.20.71/32	10.0.20.71 – 10.0.20.71	10.0.20.71
73	10.0.20.72/32	10.0.20.72 – 10.0.20.72	10.0.20.72
74	10.0.20.73/32	10.0.20.73 – 10.0.20.73	10.0.20.73
75	10.0.20.74/32	10.0.20.74 – 10.0.20.74	10.0.20.74
76	10.0.20.75/32	10.0.20.75 – 10.0.20.75	10.0.20.75
77	10.0.20.76/32	10.0.20.76 – 10.0.20.76	10.0.20.76
78	10.0.20.77/32	10.0.20.77 – 10.0.20.77	10.0.20.77
79	10.0.20.78/32	10.0.20.78 – 10.0.20.78	10.0.20.78
80	10.0.20.79/32	10.0.20.79 – 10.0.20.79	10.0.20.79
81	10.0.20.80/32	10.0.20.80 – 10.0.20.80	10.0.20.80
82	10.0.20.81/32	10.0.20.81 – 10.0.20.81	10.0.20.81
83	10.0.20.82/32	10.0.20.82 – 10.0.20.82	10.0.20.82
84	10.0.20.83/32	10.0.20.83 – 10.0.20.83	10.0.20.83
85	10.0.20.84/32	10.0.20.84 – 10.0.20.84	10.0.20.84
86	10.0.20.85/32	10.0.20.85 – 10.0.20.85	10.0.20.85
87	10.0.20.86/32	10.0.20.86 – 10.0.20.86	10.0.20.86
88	10.0.20.87/32	10.0.20.87 – 10.0.20.87	10.0.20.87
89	10.0.20.88/32	10.0.20.88 – 10.0.20.88	10.0.20.88
90	10.0.20.89/32	10.0.20.89 – 10.0.20.89	10.0.20.89
91	10.0.20.90/32	10.0.20.90 – 10.0.20.90	10.0.20.90
92	10.0.20.91/32	10.0.20.91 – 10.0.20.91	10.0.20.91
93	10.0.20.92/32	10.0.20.92 – 10.0.20.92	10.0.20.92
94	10.0.20.93/32	10.0.20.93 – 10.0.20.93	10.0.20.93
95	10.0.20.94/32	10.0.20.94 – 10.0.20.94	10.0.20.94
96	10.0.20.95/32	10.0.20.95 – 10.0.20.95	10.0.20.95
97	10.0.20.96/32	10.0.20.96 – 10.0.20.96	10.0.20.96
98	10.0.20.97/32	10.0.20.97 – 10.0.20.97	10.0.20.97
99	10.0.20.98/32	10.0.20.98 – 10.0.20.98	10.0.20.98
100	10.0.20.99/32	10.0.20.99 – 10.0.20.99	10.0.20.99
101	10.0.20.100/32	10.0.20.100 – 10.0.20.100	10.0.20.100
102	10.0.20.101/32	10.0.20.101 – 10.0.20.101	10.0.20.101
103	10.0.20.102/32	10.0.20.102 – 10.0.20.102	10.0.20.102
104	10.0.20.103/32	10.0.20.103 – 10.0.20.103	10.0.20.103
105	10.0.20.104/32	10.0.20.104 – 10.0.20.104	10.0.20.104
106	10.0.20.105/32	10.0.20.105 – 10.0.20.105	10.0.20.105
107	10.0.20.106/32	10.0.20.106 – 10.0.20.106	10.0.20.106
108	10.0.20.107/32	10.0.20.107 – 10.0.20.107	10.0.20.107
109	10.0.20.108/32	10.0.20.108 – 10.0.20.108	10.0.20.108
110	10.0.20.109/32	10.0.20.109 – 10.0.20.109	10.0.20.109
111	10.0.20.110/32	10.0.20.110 – 10.0.20.110	10.0.20.110
112	10.0.20.111/32	10.0.20.111 – 10.0.20.111	10.0.20.111
113	10.0.20.112/32	10.0.20.112 – 10.0.20.112	10.0.20.112
114	10.0.20.113/32	10.0.20.113 – 10.0.20.113	10.0.20.113
115	10.0.20.114/32	10.0.20.114 – 10.0.20.114	10.0.20.114
116	10.0.20.115/32	10.0.20.115 – 10.0.20.115	10.0.20.115
117	10.0.20.116/32	10.0.20.116 – 10.0.20.116	10.0.20.116
118	10.0.20.117/32	10.0.20.117 – 10.0.20.117	10.0.20.117
119	10.0.20.118/32	10.0.20.118 – 10.0.20.118	10.0.20.118
120	10.0.20.119/32	10.0.20.119 – 10.0.20.119	10.0.20.119
121	10.0.20.120/32	10.0.20.120 – 10.0.20.120	10.0.20.120
122	10.0.20.121/32	10.0.20.121 – 10.0.20.121	10.0.20.121
123	10.0.20.122/32	10.0.20.122 – 10.0.20.122	10.0.20.122
124	10.0.20.123/32	10.0.20.123 – 10.0.20.123	10.0.20.123
125	10.0.20.124/32	10.0.20.124 – 10.0.20.124	10.0.20.124
126	10.0.20.125/32	10.0.20.125 – 10.0.20.125	10.0.20.125
127	10.0.20.126/32	10.0.20.126 – 10.0.20.126	10.0.20.126
128	10.0.20.127/32	10.0.20.127 – 10.0.20.127	10.0.20.127
129	10.0.20.128/32	10.0.20.128 – 10.0.20.128	10.0.20.128
130	10.0.20.129/32	10.0.20.129 – 10.0.20.129	10.0.20.129
131	10.0.20.130/32	10.0.20.130 – 10.0.20.130	10.0.20.130
132	10.0.20.131/32	10.0.20.131 – 10.0.20.131	10.0.20.131
133	10.0.20.132/32	10.0.20.132 – 10.0.20.132	10.0.20.132
134	10.0.20.133/32	10.0.20.133 – 10.0.20.133	10.0.20.133
135	10.0.20.134/32	10.0.20.134 – 10.0.20.134	10.0.20.134
136	10.0.20.135/32	10.0.20.135 – 10.0.20.135	10.0.20.135
137	10.0.20.136/32	10.0.20.136 – 10.0.20.136	10.0.20.136
138	10.0.20.137/32	10.0.20.137 – 10.0.20.137	10.0.20.137
139	10.0.20.138/32	10.0.20.138 – 10.0.20.138	10.0.20.138
140	10.0.20.139/32	10.0.20.139 – 10.0.20.139	10.0.20.139
141	10.0.20.140/32	10.0.20.140 – 10.0.20.140	10.0.20.140
142	10.0.20.141/32	10.0.20.141 – 10.0.20.141	10.0.20.141
143	10.0.20.142/32	10.0.20.142 – 10.0.20.142	10.0.20.142
144	10.0.20.143/32	10.0.20.143 – 10.0.20.143	10.0.20.143
145	10.0.20.144/32	10.0.20.144 – 10.0.20.144	10.0.20.144
146	10.0.20.145/32	10.0.20.145 – 10.0.20.145	10.0.20.145
147	10.0.20.146/32	10.0.20.146 – 10.0.20.146	10.0.20.146
148	10.0.20.147/32	10.0.20.147 – 10.0.20.147	10.0.20.147
149	10.0.20.148/32	10.0.20.148 – 10.0.20.148	10.0.20.148
150	10.0.20.149/32	10.0.20.149 – 10.0.20.149	10.0.20.149
151	10.0.20.150/32	10.0.20.150 – 10.0.20.150	10.0.20.150
152	10.0.20.151/32	10.0.20.151 – 10.0.20.151	10.0.20.151
153	10.0.20.152/32	10.0.20.152 – 10.0.20.152	10.0.20.152
154	10.0.20.153/32	10.0.20.153 – 10.0.20.153	10.0.20.153
155	10.0.20.154/32	10.0.20.154 – 10.0.20.154	10.0.20.154
156	10.0.20.155/32	10.0.20.155 – 10.0.20.155	10.0.20.155
157	10.0.20.156/32	10.0.20.156 – 10.0.20.156	10.0.20.156
158	10.0.20.157/32	10.0.20.157 – 10.0.20.157	10.0.20.157
159	10.0.20.158/32	10.0.20.158 – 10.0.20.158	10.0.20.158
160	10.0.20.159/32	10.0.20.159 – 10.0.20.159	10.0.20.159
161	10.0.20.160/32	10.0.20.160 – 10.0.20.160	10.0.20.160
162	10.0.20.161/32	10.0.20.161 – 10.0.20.161	10.0.20.161
163	10.0.20.162/32	10.0.20.162 – 10.0.20.162	10.0.20.162
164	10.0.20.163/32	10.0.20.163 – 10.0.20.163	10.0.20.163
165	10.0.20.164/32	10.0.20.164 – 10.0.20.164	10.0.20.164
166	10.0.20.165/32	10.0.20.165 – 10.0.20.165	10.0.20.165
167	10.0.20.166/32	10.0.20.166 – 10.0.20.166	10.0.20.166
168	10.0.20.167/32	10.0.20.167 – 10.0.20.167	10.0.20.167
169	10.0.20.168/32	10.0.20.168 – 10.0.20.168	10.0.20.168
170	10.0.20.169/32	10.0.20.169 – 10.0.20.169	10.0.20.169
171	10.0.20.170/32	10.0.20.170 – 10.0.20.170	10.0.20.170
172	10.0.20.171/32	10.0.20.171 – 10.0.20.171	10.0.20.171
173	10.0.20.172/32	10.0.20.172 – 10.0.20.172	10.0.20.172
174	10.0.20.173/32	10.0.20.173 – 10.0.20.173	10.0.20.173
175	10.0.20.174/32	10.0.20.174 – 10.0.20.174	10.0.20.174
176	10.0.20.175/32	10.0.20.175 – 10.0.20.175	10.0.20.175
177	10.0.20.176/32	10.0.20.176 – 10.0.20.176	10.0.20.176
178	10.0.20.177/32	10.0.20.177 – 10.0.20.177	10.0.20.177
179	10.0.20.178/32	10.0.20.178 – 10.0.20.178	10.0.20.178
180	10.0.20.179/32	10.0.20.179 – 10.0.20.179	10.0.20.179
181	10.0.20.180/32	10.0.20.180 – 10.0.20.180	10.0.20.180
182	10.0.20.181/32	10.0.20.181 – 10.0.20.181	10.0.20.181
183	10.0.20.182/32	10.0.20.182 – 10.0.20.182	10.0.20.182
184	10.0.20.183/32	10.0.20.183 – 10.0.20.183	10.0.20.183
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186	10.0.20.185/32	10.0.20.185 – 10.0.20.185	10.0.20.185
187	10.0.20.186/32	10.0.20.186 – 10.0.20.186	10.0.20.186
188	10.0.20.187/32	10.0.20.187 – 10.0.20.187	10.0.20.187
189	10.0.20.188/32	10.0.20.188 – 10.0.20.188	10.0.20.188
190	10.0.20.189/32	10.0.20.189 – 10.0.20.189	10.0.20.189
191	10.0.20.190/32	10.0.20.190 – 10.0.20.190	10.0.20.190
192	10.0.20.191/32	10.0.20.191 – 10.0.20.191	10.0.20.191
193	10.0.20.192/32	10.0.20.192 – 10.0.20.192	10.0.20.192
194	10.0.20.193/32	10.0.20.193 – 10.0.20.193	10.0.20.193
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197	10.0.20.196/32	10.0.20.196 – 10.0.20.196	10.0.20.196
198	10.0.20.197/32	10.0.20.197 – 10.0.20.197	10.0.20.197
199	10.0.20.198/32	10.0.20.198 – 10.0.20.198	10.0.20.198
200	10.0.20.199/32	10.0.20.199 – 10.0.20.199	10.0.20.199
201	10.0.20.200/32	10.0.20.200 – 10.0.20.200	10.0.20.200
202	10.0.20.201/32	10.0.20.201 – 10.0.20.201	10.0.20.201
203	10.0.20.202/32	10.0.20.202 – 10.0.20.202	10.0.20.202
204	10.0.20.203/32	10.0.20.203 – 10.0.20.203	10.0.20.203
205	10.0.20.204/32	10.0.20.204 – 10.0.20.204	10.0.20.204
206	10.0.20.205/32	10.0.20.205 – 10.0.20.205	10.0.20.205
207	10.0.20.206/32	10.0.20.206 – 10.0.20.206	10.0.20.206
208	10.0.20.207/32	10.0.20.207 – 10.0.20.207	10.0.20.207
209	10.0.20.208/32	10.0.20.208 – 10.0.20.208	10.0.20.208
210	10.0.20.209/32	10.0.20.209 – 10.0.20.209	10.0.20.209
211	10.0.20.210/32	10.0.20.210 – 10.0.20.210	10.0.20.210
212	10.0.20.211/32	10.0.20.211 – 10.0.20.211	10.0.20.211
213	10.0.20.212/32	10.0.20.212 – 10.0.20.212	10.0.20.212
214	10.0.20.213/32	10.0.20.213 – 10.0.20.213	10.0.20.213
215	10.0.20.214/32	10.0.20.214 – 10.0.20.214	10.0.20.214
216	10.0.20.215/32	10.0.20.215 – 10.0.20.215	10.0.20.215
217	10.0.20.216/32	10.0.20.216 – 10.0.20.216	10.0.20.216
218	10.0.20.217/32	10.0.20.217 – 10.0.20.217	10.0.20.217
219	10.0.20.218/32	10.0.20.218 – 10.0.20.218	10.0.20.218
220	10.0.20.219/32	10.0.20.219 – 10.0.20.219	10.0.20.219
221	10.0.20.220/32	10.0.20.220 – 10.0.20.220	10.0.20.220
222	10.0.20.221/32	10.0.20.221 – 10.0.20.221	10.0.20.221
223	10.0.20.222/32	10.0.20.222 – 10.0.20.222	10.0.20.222
224	10.0.20.223/32	10.0.20.223 – 10.0.20.223	10.0.20.223
225	10.0.20.224/32	10.0.20.224 – 10.0.20.224	10.0.20.224
226	10.0.20.225/32	10.0.20.225 – 10.0.20.225	10.0.20.225
227	10.0.20.226/32	10.0.20.226 – 10.0.20.226	10.0.20.226
228	10.0.20.227/32	10.0.20.227 – 10.0.20.227	10.0.20.227
229	10.0.20.228/32	10.0.20.228 – 10.0.20.228	10.0.20.228
230	10.0.20.229/32	10.0.20.229 – 10.0.20.229	10.0.20.229
231	10.0.20.230/32	10.0.20.230 – 10.0.20.230	10.0.20.230
232	10.0.20.231/32	10.0.20.231 – 10.0.20.231	10.0.20.231
233	10.0.20.232/32	10.0.20.232 – 10.0.20.232	10.0.20.232
234	10.0.20.233/32	10.0.20.233 – 10.0.20.233	10.0.20.233
235	10.0.20.234/32	10.0.20.234 – 10.0.20.234	10.0.20.234
236	10.0.20.235/32	10.0.20.235 – 10.0.20.235	10.0.20.235
237	10.0.20.236/32	10.0.20.236 – 10.0.20.236	10.0.20.236
238	10.0.20.237/32	10.0.20.237 – 10.0.20.237	10.0.20.237
239	10.0.20.238/32	10.0.20.238 – 10.0.20.238	10.0.20.238
240	10.0.20.239/32	10.0.20.239 – 10.0.20.239	10.0.20.239
241	10.0.20.240/32	10.0.20.240 – 10.0.20.240	10.0.20.240
242	10.0.20.241/32	10.0.20.241 – 10.0.20.241	10.0.20.241
243	10.0.20.242/32	10.0.20.242 – 10.0.20.242	10.0.20.242
244	10.0.20.243/32	10.0.20.243 – 10.0.20.243	10.0.20.243
245	10.0.20.244/32	10.0.20.244 – 10.0.20.244	10.0.20.244
246	10.0.20.245/32	10.0.20.245 – 10.0.20.245	10.0.20.245
247	10.0.20.246/32	10.0.20.246 – 10.0.20.246	10.0.20.246
248	10.0.20.247/32	10.0.20.247 – 10.0.20.247	10.0.20.247
249	10.0.20.248/32	10.0.20.248 – 10.0.20.248	10.0.20.248
250	10.0.20.249/32	10.0.20.249 – 10.0.20.249	10.0.20.249
251	10.0.20.250/32	10.0.20.250 – 10.0.20.250	10.0.20.250
252	10.0.20.251/32	10.0.20.251 – 10.0.20.251	10.0.20.251
253	10.0.20.252/32	10.0.20.252 – 10.0.20.252	10.0.20.252
254	10.0.20.253/32	10.0.20.253 – 10.0.20.253	10.0.20.253
255	10.0.20.254/32	10.0.20.254 – 10.0.20.254	10.0.20.254
256	10.0.20.255/32	10.0.20.255 – 10.0.20.255	10.0.20.255

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 /22
/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	-
/22	255.255.252.0	1,024	1,022	1
/23	255.255.254.0	512	510	2 split →
/24	255.255.255.0	256	254	4 split →
/25	255.255.255.128	128	126	8 split →
/26	255.255.255.192	64	62	16 split →
/27	255.255.255.224	32	30	32 split →
/28	255.255.255.240	16	14	64 split →
/29	255.255.255.248	8	6	128 split →
/30	255.255.255.252	4	2	256 split →
/31	255.255.255.254	2	2	512 split →
/32	255.255.255.255	1	1	1,024 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 →