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)10.40.0.0/18

network10.40.0.0/18

broadcast10.40.63.255

first host10.40.0.1

last host10.40.63.254

subnet mask255.255.192.0

wildcard0.0.63.255

addresses16,384

usable hosts16,382

classA

ipcalc 10.40.0.0/18

address00001010.00101000.00000000.00000000

subnet mask11111111.11111111.11000000.00000000

network00001010.00101000.00000000.00000000

broadcast00001010.00101000.00111111.11111111

green = network part, grey = host part

hex0x0a280000

decimal170393600

reverse dns0.0.40.10.in-addr.arpa

ipv4-mapped::ffff:a28:0

/18 split into /32 · 16,384 subnets

close ×

#	network	host range	broadcast
1	10.40.0.0/32	10.40.0.0 – 10.40.0.0	10.40.0.0
2	10.40.0.1/32	10.40.0.1 – 10.40.0.1	10.40.0.1
3	10.40.0.2/32	10.40.0.2 – 10.40.0.2	10.40.0.2
4	10.40.0.3/32	10.40.0.3 – 10.40.0.3	10.40.0.3
5	10.40.0.4/32	10.40.0.4 – 10.40.0.4	10.40.0.4
6	10.40.0.5/32	10.40.0.5 – 10.40.0.5	10.40.0.5
7	10.40.0.6/32	10.40.0.6 – 10.40.0.6	10.40.0.6
8	10.40.0.7/32	10.40.0.7 – 10.40.0.7	10.40.0.7
9	10.40.0.8/32	10.40.0.8 – 10.40.0.8	10.40.0.8
10	10.40.0.9/32	10.40.0.9 – 10.40.0.9	10.40.0.9
11	10.40.0.10/32	10.40.0.10 – 10.40.0.10	10.40.0.10
12	10.40.0.11/32	10.40.0.11 – 10.40.0.11	10.40.0.11
13	10.40.0.12/32	10.40.0.12 – 10.40.0.12	10.40.0.12
14	10.40.0.13/32	10.40.0.13 – 10.40.0.13	10.40.0.13
15	10.40.0.14/32	10.40.0.14 – 10.40.0.14	10.40.0.14
16	10.40.0.15/32	10.40.0.15 – 10.40.0.15	10.40.0.15
17	10.40.0.16/32	10.40.0.16 – 10.40.0.16	10.40.0.16
18	10.40.0.17/32	10.40.0.17 – 10.40.0.17	10.40.0.17
19	10.40.0.18/32	10.40.0.18 – 10.40.0.18	10.40.0.18
20	10.40.0.19/32	10.40.0.19 – 10.40.0.19	10.40.0.19
21	10.40.0.20/32	10.40.0.20 – 10.40.0.20	10.40.0.20
22	10.40.0.21/32	10.40.0.21 – 10.40.0.21	10.40.0.21
23	10.40.0.22/32	10.40.0.22 – 10.40.0.22	10.40.0.22
24	10.40.0.23/32	10.40.0.23 – 10.40.0.23	10.40.0.23
25	10.40.0.24/32	10.40.0.24 – 10.40.0.24	10.40.0.24
26	10.40.0.25/32	10.40.0.25 – 10.40.0.25	10.40.0.25
27	10.40.0.26/32	10.40.0.26 – 10.40.0.26	10.40.0.26
28	10.40.0.27/32	10.40.0.27 – 10.40.0.27	10.40.0.27
29	10.40.0.28/32	10.40.0.28 – 10.40.0.28	10.40.0.28
30	10.40.0.29/32	10.40.0.29 – 10.40.0.29	10.40.0.29
31	10.40.0.30/32	10.40.0.30 – 10.40.0.30	10.40.0.30
32	10.40.0.31/32	10.40.0.31 – 10.40.0.31	10.40.0.31
33	10.40.0.32/32	10.40.0.32 – 10.40.0.32	10.40.0.32
34	10.40.0.33/32	10.40.0.33 – 10.40.0.33	10.40.0.33
35	10.40.0.34/32	10.40.0.34 – 10.40.0.34	10.40.0.34
36	10.40.0.35/32	10.40.0.35 – 10.40.0.35	10.40.0.35
37	10.40.0.36/32	10.40.0.36 – 10.40.0.36	10.40.0.36
38	10.40.0.37/32	10.40.0.37 – 10.40.0.37	10.40.0.37
39	10.40.0.38/32	10.40.0.38 – 10.40.0.38	10.40.0.38
40	10.40.0.39/32	10.40.0.39 – 10.40.0.39	10.40.0.39
41	10.40.0.40/32	10.40.0.40 – 10.40.0.40	10.40.0.40
42	10.40.0.41/32	10.40.0.41 – 10.40.0.41	10.40.0.41
43	10.40.0.42/32	10.40.0.42 – 10.40.0.42	10.40.0.42
44	10.40.0.43/32	10.40.0.43 – 10.40.0.43	10.40.0.43
45	10.40.0.44/32	10.40.0.44 – 10.40.0.44	10.40.0.44
46	10.40.0.45/32	10.40.0.45 – 10.40.0.45	10.40.0.45
47	10.40.0.46/32	10.40.0.46 – 10.40.0.46	10.40.0.46
48	10.40.0.47/32	10.40.0.47 – 10.40.0.47	10.40.0.47
49	10.40.0.48/32	10.40.0.48 – 10.40.0.48	10.40.0.48
50	10.40.0.49/32	10.40.0.49 – 10.40.0.49	10.40.0.49
51	10.40.0.50/32	10.40.0.50 – 10.40.0.50	10.40.0.50
52	10.40.0.51/32	10.40.0.51 – 10.40.0.51	10.40.0.51
53	10.40.0.52/32	10.40.0.52 – 10.40.0.52	10.40.0.52
54	10.40.0.53/32	10.40.0.53 – 10.40.0.53	10.40.0.53
55	10.40.0.54/32	10.40.0.54 – 10.40.0.54	10.40.0.54
56	10.40.0.55/32	10.40.0.55 – 10.40.0.55	10.40.0.55
57	10.40.0.56/32	10.40.0.56 – 10.40.0.56	10.40.0.56
58	10.40.0.57/32	10.40.0.57 – 10.40.0.57	10.40.0.57
59	10.40.0.58/32	10.40.0.58 – 10.40.0.58	10.40.0.58
60	10.40.0.59/32	10.40.0.59 – 10.40.0.59	10.40.0.59
61	10.40.0.60/32	10.40.0.60 – 10.40.0.60	10.40.0.60
62	10.40.0.61/32	10.40.0.61 – 10.40.0.61	10.40.0.61
63	10.40.0.62/32	10.40.0.62 – 10.40.0.62	10.40.0.62
64	10.40.0.63/32	10.40.0.63 – 10.40.0.63	10.40.0.63
65	10.40.0.64/32	10.40.0.64 – 10.40.0.64	10.40.0.64
66	10.40.0.65/32	10.40.0.65 – 10.40.0.65	10.40.0.65
67	10.40.0.66/32	10.40.0.66 – 10.40.0.66	10.40.0.66
68	10.40.0.67/32	10.40.0.67 – 10.40.0.67	10.40.0.67
69	10.40.0.68/32	10.40.0.68 – 10.40.0.68	10.40.0.68
70	10.40.0.69/32	10.40.0.69 – 10.40.0.69	10.40.0.69
71	10.40.0.70/32	10.40.0.70 – 10.40.0.70	10.40.0.70
72	10.40.0.71/32	10.40.0.71 – 10.40.0.71	10.40.0.71
73	10.40.0.72/32	10.40.0.72 – 10.40.0.72	10.40.0.72
74	10.40.0.73/32	10.40.0.73 – 10.40.0.73	10.40.0.73
75	10.40.0.74/32	10.40.0.74 – 10.40.0.74	10.40.0.74
76	10.40.0.75/32	10.40.0.75 – 10.40.0.75	10.40.0.75
77	10.40.0.76/32	10.40.0.76 – 10.40.0.76	10.40.0.76
78	10.40.0.77/32	10.40.0.77 – 10.40.0.77	10.40.0.77
79	10.40.0.78/32	10.40.0.78 – 10.40.0.78	10.40.0.78
80	10.40.0.79/32	10.40.0.79 – 10.40.0.79	10.40.0.79
81	10.40.0.80/32	10.40.0.80 – 10.40.0.80	10.40.0.80
82	10.40.0.81/32	10.40.0.81 – 10.40.0.81	10.40.0.81
83	10.40.0.82/32	10.40.0.82 – 10.40.0.82	10.40.0.82
84	10.40.0.83/32	10.40.0.83 – 10.40.0.83	10.40.0.83
85	10.40.0.84/32	10.40.0.84 – 10.40.0.84	10.40.0.84
86	10.40.0.85/32	10.40.0.85 – 10.40.0.85	10.40.0.85
87	10.40.0.86/32	10.40.0.86 – 10.40.0.86	10.40.0.86
88	10.40.0.87/32	10.40.0.87 – 10.40.0.87	10.40.0.87
89	10.40.0.88/32	10.40.0.88 – 10.40.0.88	10.40.0.88
90	10.40.0.89/32	10.40.0.89 – 10.40.0.89	10.40.0.89
91	10.40.0.90/32	10.40.0.90 – 10.40.0.90	10.40.0.90
92	10.40.0.91/32	10.40.0.91 – 10.40.0.91	10.40.0.91
93	10.40.0.92/32	10.40.0.92 – 10.40.0.92	10.40.0.92
94	10.40.0.93/32	10.40.0.93 – 10.40.0.93	10.40.0.93
95	10.40.0.94/32	10.40.0.94 – 10.40.0.94	10.40.0.94
96	10.40.0.95/32	10.40.0.95 – 10.40.0.95	10.40.0.95
97	10.40.0.96/32	10.40.0.96 – 10.40.0.96	10.40.0.96
98	10.40.0.97/32	10.40.0.97 – 10.40.0.97	10.40.0.97
99	10.40.0.98/32	10.40.0.98 – 10.40.0.98	10.40.0.98
100	10.40.0.99/32	10.40.0.99 – 10.40.0.99	10.40.0.99
101	10.40.0.100/32	10.40.0.100 – 10.40.0.100	10.40.0.100
102	10.40.0.101/32	10.40.0.101 – 10.40.0.101	10.40.0.101
103	10.40.0.102/32	10.40.0.102 – 10.40.0.102	10.40.0.102
104	10.40.0.103/32	10.40.0.103 – 10.40.0.103	10.40.0.103
105	10.40.0.104/32	10.40.0.104 – 10.40.0.104	10.40.0.104
106	10.40.0.105/32	10.40.0.105 – 10.40.0.105	10.40.0.105
107	10.40.0.106/32	10.40.0.106 – 10.40.0.106	10.40.0.106
108	10.40.0.107/32	10.40.0.107 – 10.40.0.107	10.40.0.107
109	10.40.0.108/32	10.40.0.108 – 10.40.0.108	10.40.0.108
110	10.40.0.109/32	10.40.0.109 – 10.40.0.109	10.40.0.109
111	10.40.0.110/32	10.40.0.110 – 10.40.0.110	10.40.0.110
112	10.40.0.111/32	10.40.0.111 – 10.40.0.111	10.40.0.111
113	10.40.0.112/32	10.40.0.112 – 10.40.0.112	10.40.0.112
114	10.40.0.113/32	10.40.0.113 – 10.40.0.113	10.40.0.113
115	10.40.0.114/32	10.40.0.114 – 10.40.0.114	10.40.0.114
116	10.40.0.115/32	10.40.0.115 – 10.40.0.115	10.40.0.115
117	10.40.0.116/32	10.40.0.116 – 10.40.0.116	10.40.0.116
118	10.40.0.117/32	10.40.0.117 – 10.40.0.117	10.40.0.117
119	10.40.0.118/32	10.40.0.118 – 10.40.0.118	10.40.0.118
120	10.40.0.119/32	10.40.0.119 – 10.40.0.119	10.40.0.119
121	10.40.0.120/32	10.40.0.120 – 10.40.0.120	10.40.0.120
122	10.40.0.121/32	10.40.0.121 – 10.40.0.121	10.40.0.121
123	10.40.0.122/32	10.40.0.122 – 10.40.0.122	10.40.0.122
124	10.40.0.123/32	10.40.0.123 – 10.40.0.123	10.40.0.123
125	10.40.0.124/32	10.40.0.124 – 10.40.0.124	10.40.0.124
126	10.40.0.125/32	10.40.0.125 – 10.40.0.125	10.40.0.125
127	10.40.0.126/32	10.40.0.126 – 10.40.0.126	10.40.0.126
128	10.40.0.127/32	10.40.0.127 – 10.40.0.127	10.40.0.127
129	10.40.0.128/32	10.40.0.128 – 10.40.0.128	10.40.0.128
130	10.40.0.129/32	10.40.0.129 – 10.40.0.129	10.40.0.129
131	10.40.0.130/32	10.40.0.130 – 10.40.0.130	10.40.0.130
132	10.40.0.131/32	10.40.0.131 – 10.40.0.131	10.40.0.131
133	10.40.0.132/32	10.40.0.132 – 10.40.0.132	10.40.0.132
134	10.40.0.133/32	10.40.0.133 – 10.40.0.133	10.40.0.133
135	10.40.0.134/32	10.40.0.134 – 10.40.0.134	10.40.0.134
136	10.40.0.135/32	10.40.0.135 – 10.40.0.135	10.40.0.135
137	10.40.0.136/32	10.40.0.136 – 10.40.0.136	10.40.0.136
138	10.40.0.137/32	10.40.0.137 – 10.40.0.137	10.40.0.137
139	10.40.0.138/32	10.40.0.138 – 10.40.0.138	10.40.0.138
140	10.40.0.139/32	10.40.0.139 – 10.40.0.139	10.40.0.139
141	10.40.0.140/32	10.40.0.140 – 10.40.0.140	10.40.0.140
142	10.40.0.141/32	10.40.0.141 – 10.40.0.141	10.40.0.141
143	10.40.0.142/32	10.40.0.142 – 10.40.0.142	10.40.0.142
144	10.40.0.143/32	10.40.0.143 – 10.40.0.143	10.40.0.143
145	10.40.0.144/32	10.40.0.144 – 10.40.0.144	10.40.0.144
146	10.40.0.145/32	10.40.0.145 – 10.40.0.145	10.40.0.145
147	10.40.0.146/32	10.40.0.146 – 10.40.0.146	10.40.0.146
148	10.40.0.147/32	10.40.0.147 – 10.40.0.147	10.40.0.147
149	10.40.0.148/32	10.40.0.148 – 10.40.0.148	10.40.0.148
150	10.40.0.149/32	10.40.0.149 – 10.40.0.149	10.40.0.149
151	10.40.0.150/32	10.40.0.150 – 10.40.0.150	10.40.0.150
152	10.40.0.151/32	10.40.0.151 – 10.40.0.151	10.40.0.151
153	10.40.0.152/32	10.40.0.152 – 10.40.0.152	10.40.0.152
154	10.40.0.153/32	10.40.0.153 – 10.40.0.153	10.40.0.153
155	10.40.0.154/32	10.40.0.154 – 10.40.0.154	10.40.0.154
156	10.40.0.155/32	10.40.0.155 – 10.40.0.155	10.40.0.155
157	10.40.0.156/32	10.40.0.156 – 10.40.0.156	10.40.0.156
158	10.40.0.157/32	10.40.0.157 – 10.40.0.157	10.40.0.157
159	10.40.0.158/32	10.40.0.158 – 10.40.0.158	10.40.0.158
160	10.40.0.159/32	10.40.0.159 – 10.40.0.159	10.40.0.159
161	10.40.0.160/32	10.40.0.160 – 10.40.0.160	10.40.0.160
162	10.40.0.161/32	10.40.0.161 – 10.40.0.161	10.40.0.161
163	10.40.0.162/32	10.40.0.162 – 10.40.0.162	10.40.0.162
164	10.40.0.163/32	10.40.0.163 – 10.40.0.163	10.40.0.163
165	10.40.0.164/32	10.40.0.164 – 10.40.0.164	10.40.0.164
166	10.40.0.165/32	10.40.0.165 – 10.40.0.165	10.40.0.165
167	10.40.0.166/32	10.40.0.166 – 10.40.0.166	10.40.0.166
168	10.40.0.167/32	10.40.0.167 – 10.40.0.167	10.40.0.167
169	10.40.0.168/32	10.40.0.168 – 10.40.0.168	10.40.0.168
170	10.40.0.169/32	10.40.0.169 – 10.40.0.169	10.40.0.169
171	10.40.0.170/32	10.40.0.170 – 10.40.0.170	10.40.0.170
172	10.40.0.171/32	10.40.0.171 – 10.40.0.171	10.40.0.171
173	10.40.0.172/32	10.40.0.172 – 10.40.0.172	10.40.0.172
174	10.40.0.173/32	10.40.0.173 – 10.40.0.173	10.40.0.173
175	10.40.0.174/32	10.40.0.174 – 10.40.0.174	10.40.0.174
176	10.40.0.175/32	10.40.0.175 – 10.40.0.175	10.40.0.175
177	10.40.0.176/32	10.40.0.176 – 10.40.0.176	10.40.0.176
178	10.40.0.177/32	10.40.0.177 – 10.40.0.177	10.40.0.177
179	10.40.0.178/32	10.40.0.178 – 10.40.0.178	10.40.0.178
180	10.40.0.179/32	10.40.0.179 – 10.40.0.179	10.40.0.179
181	10.40.0.180/32	10.40.0.180 – 10.40.0.180	10.40.0.180
182	10.40.0.181/32	10.40.0.181 – 10.40.0.181	10.40.0.181
183	10.40.0.182/32	10.40.0.182 – 10.40.0.182	10.40.0.182
184	10.40.0.183/32	10.40.0.183 – 10.40.0.183	10.40.0.183
185	10.40.0.184/32	10.40.0.184 – 10.40.0.184	10.40.0.184
186	10.40.0.185/32	10.40.0.185 – 10.40.0.185	10.40.0.185
187	10.40.0.186/32	10.40.0.186 – 10.40.0.186	10.40.0.186
188	10.40.0.187/32	10.40.0.187 – 10.40.0.187	10.40.0.187
189	10.40.0.188/32	10.40.0.188 – 10.40.0.188	10.40.0.188
190	10.40.0.189/32	10.40.0.189 – 10.40.0.189	10.40.0.189
191	10.40.0.190/32	10.40.0.190 – 10.40.0.190	10.40.0.190
192	10.40.0.191/32	10.40.0.191 – 10.40.0.191	10.40.0.191
193	10.40.0.192/32	10.40.0.192 – 10.40.0.192	10.40.0.192
194	10.40.0.193/32	10.40.0.193 – 10.40.0.193	10.40.0.193
195	10.40.0.194/32	10.40.0.194 – 10.40.0.194	10.40.0.194
196	10.40.0.195/32	10.40.0.195 – 10.40.0.195	10.40.0.195
197	10.40.0.196/32	10.40.0.196 – 10.40.0.196	10.40.0.196
198	10.40.0.197/32	10.40.0.197 – 10.40.0.197	10.40.0.197
199	10.40.0.198/32	10.40.0.198 – 10.40.0.198	10.40.0.198
200	10.40.0.199/32	10.40.0.199 – 10.40.0.199	10.40.0.199
201	10.40.0.200/32	10.40.0.200 – 10.40.0.200	10.40.0.200
202	10.40.0.201/32	10.40.0.201 – 10.40.0.201	10.40.0.201
203	10.40.0.202/32	10.40.0.202 – 10.40.0.202	10.40.0.202
204	10.40.0.203/32	10.40.0.203 – 10.40.0.203	10.40.0.203
205	10.40.0.204/32	10.40.0.204 – 10.40.0.204	10.40.0.204
206	10.40.0.205/32	10.40.0.205 – 10.40.0.205	10.40.0.205
207	10.40.0.206/32	10.40.0.206 – 10.40.0.206	10.40.0.206
208	10.40.0.207/32	10.40.0.207 – 10.40.0.207	10.40.0.207
209	10.40.0.208/32	10.40.0.208 – 10.40.0.208	10.40.0.208
210	10.40.0.209/32	10.40.0.209 – 10.40.0.209	10.40.0.209
211	10.40.0.210/32	10.40.0.210 – 10.40.0.210	10.40.0.210
212	10.40.0.211/32	10.40.0.211 – 10.40.0.211	10.40.0.211
213	10.40.0.212/32	10.40.0.212 – 10.40.0.212	10.40.0.212
214	10.40.0.213/32	10.40.0.213 – 10.40.0.213	10.40.0.213
215	10.40.0.214/32	10.40.0.214 – 10.40.0.214	10.40.0.214
216	10.40.0.215/32	10.40.0.215 – 10.40.0.215	10.40.0.215
217	10.40.0.216/32	10.40.0.216 – 10.40.0.216	10.40.0.216
218	10.40.0.217/32	10.40.0.217 – 10.40.0.217	10.40.0.217
219	10.40.0.218/32	10.40.0.218 – 10.40.0.218	10.40.0.218
220	10.40.0.219/32	10.40.0.219 – 10.40.0.219	10.40.0.219
221	10.40.0.220/32	10.40.0.220 – 10.40.0.220	10.40.0.220
222	10.40.0.221/32	10.40.0.221 – 10.40.0.221	10.40.0.221
223	10.40.0.222/32	10.40.0.222 – 10.40.0.222	10.40.0.222
224	10.40.0.223/32	10.40.0.223 – 10.40.0.223	10.40.0.223
225	10.40.0.224/32	10.40.0.224 – 10.40.0.224	10.40.0.224
226	10.40.0.225/32	10.40.0.225 – 10.40.0.225	10.40.0.225
227	10.40.0.226/32	10.40.0.226 – 10.40.0.226	10.40.0.226
228	10.40.0.227/32	10.40.0.227 – 10.40.0.227	10.40.0.227
229	10.40.0.228/32	10.40.0.228 – 10.40.0.228	10.40.0.228
230	10.40.0.229/32	10.40.0.229 – 10.40.0.229	10.40.0.229
231	10.40.0.230/32	10.40.0.230 – 10.40.0.230	10.40.0.230
232	10.40.0.231/32	10.40.0.231 – 10.40.0.231	10.40.0.231
233	10.40.0.232/32	10.40.0.232 – 10.40.0.232	10.40.0.232
234	10.40.0.233/32	10.40.0.233 – 10.40.0.233	10.40.0.233
235	10.40.0.234/32	10.40.0.234 – 10.40.0.234	10.40.0.234
236	10.40.0.235/32	10.40.0.235 – 10.40.0.235	10.40.0.235
237	10.40.0.236/32	10.40.0.236 – 10.40.0.236	10.40.0.236
238	10.40.0.237/32	10.40.0.237 – 10.40.0.237	10.40.0.237
239	10.40.0.238/32	10.40.0.238 – 10.40.0.238	10.40.0.238
240	10.40.0.239/32	10.40.0.239 – 10.40.0.239	10.40.0.239
241	10.40.0.240/32	10.40.0.240 – 10.40.0.240	10.40.0.240
242	10.40.0.241/32	10.40.0.241 – 10.40.0.241	10.40.0.241
243	10.40.0.242/32	10.40.0.242 – 10.40.0.242	10.40.0.242
244	10.40.0.243/32	10.40.0.243 – 10.40.0.243	10.40.0.243
245	10.40.0.244/32	10.40.0.244 – 10.40.0.244	10.40.0.244
246	10.40.0.245/32	10.40.0.245 – 10.40.0.245	10.40.0.245
247	10.40.0.246/32	10.40.0.246 – 10.40.0.246	10.40.0.246
248	10.40.0.247/32	10.40.0.247 – 10.40.0.247	10.40.0.247
249	10.40.0.248/32	10.40.0.248 – 10.40.0.248	10.40.0.248
250	10.40.0.249/32	10.40.0.249 – 10.40.0.249	10.40.0.249
251	10.40.0.250/32	10.40.0.250 – 10.40.0.250	10.40.0.250
252	10.40.0.251/32	10.40.0.251 – 10.40.0.251	10.40.0.251
253	10.40.0.252/32	10.40.0.252 – 10.40.0.252	10.40.0.252
254	10.40.0.253/32	10.40.0.253 – 10.40.0.253	10.40.0.253
255	10.40.0.254/32	10.40.0.254 – 10.40.0.254	10.40.0.254
256	10.40.0.255/32	10.40.0.255 – 10.40.0.255	10.40.0.255

showing 256 of 16,384

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 /18
/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	1
/19	255.255.224.0	8,192	8,190	2 split →
/20	255.255.240.0	4,096	4,094	4 split →
/21	255.255.248.0	2,048	2,046	8 split →
/22	255.255.252.0	1,024	1,022	16 split →
/23	255.255.254.0	512	510	32 split →
/24	255.255.255.0	256	254	64 split →
/25	255.255.255.128	128	126	128 split →
/26	255.255.255.192	64	62	256 split →
/27	255.255.255.224	32	30	512 split →
/28	255.255.255.240	16	14	1,024 split →
/29	255.255.255.248	8	6	2,048 split →
/30	255.255.255.252	4	2	4,096 split →
/31	255.255.255.254	2	2	8,192 split →
/32	255.255.255.255	1	1	16,384 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 →