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)10.78.192.0/24

network10.78.192.0/24

broadcast10.78.192.255

first host10.78.192.1

last host10.78.192.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.78.192.0/24

address00001010.01001110.11000000.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.01001110.11000000.00000000

broadcast00001010.01001110.11000000.11111111

green = network part, grey = host part

hex0x0a4ec000

decimal172933120

reverse dns0.192.78.10.in-addr.arpa

ipv4-mapped::ffff:a4e:c000

/24 split into /32 · 256 subnets

close ×

#	network	host range	broadcast
1	10.78.192.0/32	10.78.192.0 – 10.78.192.0	10.78.192.0
2	10.78.192.1/32	10.78.192.1 – 10.78.192.1	10.78.192.1
3	10.78.192.2/32	10.78.192.2 – 10.78.192.2	10.78.192.2
4	10.78.192.3/32	10.78.192.3 – 10.78.192.3	10.78.192.3
5	10.78.192.4/32	10.78.192.4 – 10.78.192.4	10.78.192.4
6	10.78.192.5/32	10.78.192.5 – 10.78.192.5	10.78.192.5
7	10.78.192.6/32	10.78.192.6 – 10.78.192.6	10.78.192.6
8	10.78.192.7/32	10.78.192.7 – 10.78.192.7	10.78.192.7
9	10.78.192.8/32	10.78.192.8 – 10.78.192.8	10.78.192.8
10	10.78.192.9/32	10.78.192.9 – 10.78.192.9	10.78.192.9
11	10.78.192.10/32	10.78.192.10 – 10.78.192.10	10.78.192.10
12	10.78.192.11/32	10.78.192.11 – 10.78.192.11	10.78.192.11
13	10.78.192.12/32	10.78.192.12 – 10.78.192.12	10.78.192.12
14	10.78.192.13/32	10.78.192.13 – 10.78.192.13	10.78.192.13
15	10.78.192.14/32	10.78.192.14 – 10.78.192.14	10.78.192.14
16	10.78.192.15/32	10.78.192.15 – 10.78.192.15	10.78.192.15
17	10.78.192.16/32	10.78.192.16 – 10.78.192.16	10.78.192.16
18	10.78.192.17/32	10.78.192.17 – 10.78.192.17	10.78.192.17
19	10.78.192.18/32	10.78.192.18 – 10.78.192.18	10.78.192.18
20	10.78.192.19/32	10.78.192.19 – 10.78.192.19	10.78.192.19
21	10.78.192.20/32	10.78.192.20 – 10.78.192.20	10.78.192.20
22	10.78.192.21/32	10.78.192.21 – 10.78.192.21	10.78.192.21
23	10.78.192.22/32	10.78.192.22 – 10.78.192.22	10.78.192.22
24	10.78.192.23/32	10.78.192.23 – 10.78.192.23	10.78.192.23
25	10.78.192.24/32	10.78.192.24 – 10.78.192.24	10.78.192.24
26	10.78.192.25/32	10.78.192.25 – 10.78.192.25	10.78.192.25
27	10.78.192.26/32	10.78.192.26 – 10.78.192.26	10.78.192.26
28	10.78.192.27/32	10.78.192.27 – 10.78.192.27	10.78.192.27
29	10.78.192.28/32	10.78.192.28 – 10.78.192.28	10.78.192.28
30	10.78.192.29/32	10.78.192.29 – 10.78.192.29	10.78.192.29
31	10.78.192.30/32	10.78.192.30 – 10.78.192.30	10.78.192.30
32	10.78.192.31/32	10.78.192.31 – 10.78.192.31	10.78.192.31
33	10.78.192.32/32	10.78.192.32 – 10.78.192.32	10.78.192.32
34	10.78.192.33/32	10.78.192.33 – 10.78.192.33	10.78.192.33
35	10.78.192.34/32	10.78.192.34 – 10.78.192.34	10.78.192.34
36	10.78.192.35/32	10.78.192.35 – 10.78.192.35	10.78.192.35
37	10.78.192.36/32	10.78.192.36 – 10.78.192.36	10.78.192.36
38	10.78.192.37/32	10.78.192.37 – 10.78.192.37	10.78.192.37
39	10.78.192.38/32	10.78.192.38 – 10.78.192.38	10.78.192.38
40	10.78.192.39/32	10.78.192.39 – 10.78.192.39	10.78.192.39
41	10.78.192.40/32	10.78.192.40 – 10.78.192.40	10.78.192.40
42	10.78.192.41/32	10.78.192.41 – 10.78.192.41	10.78.192.41
43	10.78.192.42/32	10.78.192.42 – 10.78.192.42	10.78.192.42
44	10.78.192.43/32	10.78.192.43 – 10.78.192.43	10.78.192.43
45	10.78.192.44/32	10.78.192.44 – 10.78.192.44	10.78.192.44
46	10.78.192.45/32	10.78.192.45 – 10.78.192.45	10.78.192.45
47	10.78.192.46/32	10.78.192.46 – 10.78.192.46	10.78.192.46
48	10.78.192.47/32	10.78.192.47 – 10.78.192.47	10.78.192.47
49	10.78.192.48/32	10.78.192.48 – 10.78.192.48	10.78.192.48
50	10.78.192.49/32	10.78.192.49 – 10.78.192.49	10.78.192.49
51	10.78.192.50/32	10.78.192.50 – 10.78.192.50	10.78.192.50
52	10.78.192.51/32	10.78.192.51 – 10.78.192.51	10.78.192.51
53	10.78.192.52/32	10.78.192.52 – 10.78.192.52	10.78.192.52
54	10.78.192.53/32	10.78.192.53 – 10.78.192.53	10.78.192.53
55	10.78.192.54/32	10.78.192.54 – 10.78.192.54	10.78.192.54
56	10.78.192.55/32	10.78.192.55 – 10.78.192.55	10.78.192.55
57	10.78.192.56/32	10.78.192.56 – 10.78.192.56	10.78.192.56
58	10.78.192.57/32	10.78.192.57 – 10.78.192.57	10.78.192.57
59	10.78.192.58/32	10.78.192.58 – 10.78.192.58	10.78.192.58
60	10.78.192.59/32	10.78.192.59 – 10.78.192.59	10.78.192.59
61	10.78.192.60/32	10.78.192.60 – 10.78.192.60	10.78.192.60
62	10.78.192.61/32	10.78.192.61 – 10.78.192.61	10.78.192.61
63	10.78.192.62/32	10.78.192.62 – 10.78.192.62	10.78.192.62
64	10.78.192.63/32	10.78.192.63 – 10.78.192.63	10.78.192.63
65	10.78.192.64/32	10.78.192.64 – 10.78.192.64	10.78.192.64
66	10.78.192.65/32	10.78.192.65 – 10.78.192.65	10.78.192.65
67	10.78.192.66/32	10.78.192.66 – 10.78.192.66	10.78.192.66
68	10.78.192.67/32	10.78.192.67 – 10.78.192.67	10.78.192.67
69	10.78.192.68/32	10.78.192.68 – 10.78.192.68	10.78.192.68
70	10.78.192.69/32	10.78.192.69 – 10.78.192.69	10.78.192.69
71	10.78.192.70/32	10.78.192.70 – 10.78.192.70	10.78.192.70
72	10.78.192.71/32	10.78.192.71 – 10.78.192.71	10.78.192.71
73	10.78.192.72/32	10.78.192.72 – 10.78.192.72	10.78.192.72
74	10.78.192.73/32	10.78.192.73 – 10.78.192.73	10.78.192.73
75	10.78.192.74/32	10.78.192.74 – 10.78.192.74	10.78.192.74
76	10.78.192.75/32	10.78.192.75 – 10.78.192.75	10.78.192.75
77	10.78.192.76/32	10.78.192.76 – 10.78.192.76	10.78.192.76
78	10.78.192.77/32	10.78.192.77 – 10.78.192.77	10.78.192.77
79	10.78.192.78/32	10.78.192.78 – 10.78.192.78	10.78.192.78
80	10.78.192.79/32	10.78.192.79 – 10.78.192.79	10.78.192.79
81	10.78.192.80/32	10.78.192.80 – 10.78.192.80	10.78.192.80
82	10.78.192.81/32	10.78.192.81 – 10.78.192.81	10.78.192.81
83	10.78.192.82/32	10.78.192.82 – 10.78.192.82	10.78.192.82
84	10.78.192.83/32	10.78.192.83 – 10.78.192.83	10.78.192.83
85	10.78.192.84/32	10.78.192.84 – 10.78.192.84	10.78.192.84
86	10.78.192.85/32	10.78.192.85 – 10.78.192.85	10.78.192.85
87	10.78.192.86/32	10.78.192.86 – 10.78.192.86	10.78.192.86
88	10.78.192.87/32	10.78.192.87 – 10.78.192.87	10.78.192.87
89	10.78.192.88/32	10.78.192.88 – 10.78.192.88	10.78.192.88
90	10.78.192.89/32	10.78.192.89 – 10.78.192.89	10.78.192.89
91	10.78.192.90/32	10.78.192.90 – 10.78.192.90	10.78.192.90
92	10.78.192.91/32	10.78.192.91 – 10.78.192.91	10.78.192.91
93	10.78.192.92/32	10.78.192.92 – 10.78.192.92	10.78.192.92
94	10.78.192.93/32	10.78.192.93 – 10.78.192.93	10.78.192.93
95	10.78.192.94/32	10.78.192.94 – 10.78.192.94	10.78.192.94
96	10.78.192.95/32	10.78.192.95 – 10.78.192.95	10.78.192.95
97	10.78.192.96/32	10.78.192.96 – 10.78.192.96	10.78.192.96
98	10.78.192.97/32	10.78.192.97 – 10.78.192.97	10.78.192.97
99	10.78.192.98/32	10.78.192.98 – 10.78.192.98	10.78.192.98
100	10.78.192.99/32	10.78.192.99 – 10.78.192.99	10.78.192.99
101	10.78.192.100/32	10.78.192.100 – 10.78.192.100	10.78.192.100
102	10.78.192.101/32	10.78.192.101 – 10.78.192.101	10.78.192.101
103	10.78.192.102/32	10.78.192.102 – 10.78.192.102	10.78.192.102
104	10.78.192.103/32	10.78.192.103 – 10.78.192.103	10.78.192.103
105	10.78.192.104/32	10.78.192.104 – 10.78.192.104	10.78.192.104
106	10.78.192.105/32	10.78.192.105 – 10.78.192.105	10.78.192.105
107	10.78.192.106/32	10.78.192.106 – 10.78.192.106	10.78.192.106
108	10.78.192.107/32	10.78.192.107 – 10.78.192.107	10.78.192.107
109	10.78.192.108/32	10.78.192.108 – 10.78.192.108	10.78.192.108
110	10.78.192.109/32	10.78.192.109 – 10.78.192.109	10.78.192.109
111	10.78.192.110/32	10.78.192.110 – 10.78.192.110	10.78.192.110
112	10.78.192.111/32	10.78.192.111 – 10.78.192.111	10.78.192.111
113	10.78.192.112/32	10.78.192.112 – 10.78.192.112	10.78.192.112
114	10.78.192.113/32	10.78.192.113 – 10.78.192.113	10.78.192.113
115	10.78.192.114/32	10.78.192.114 – 10.78.192.114	10.78.192.114
116	10.78.192.115/32	10.78.192.115 – 10.78.192.115	10.78.192.115
117	10.78.192.116/32	10.78.192.116 – 10.78.192.116	10.78.192.116
118	10.78.192.117/32	10.78.192.117 – 10.78.192.117	10.78.192.117
119	10.78.192.118/32	10.78.192.118 – 10.78.192.118	10.78.192.118
120	10.78.192.119/32	10.78.192.119 – 10.78.192.119	10.78.192.119
121	10.78.192.120/32	10.78.192.120 – 10.78.192.120	10.78.192.120
122	10.78.192.121/32	10.78.192.121 – 10.78.192.121	10.78.192.121
123	10.78.192.122/32	10.78.192.122 – 10.78.192.122	10.78.192.122
124	10.78.192.123/32	10.78.192.123 – 10.78.192.123	10.78.192.123
125	10.78.192.124/32	10.78.192.124 – 10.78.192.124	10.78.192.124
126	10.78.192.125/32	10.78.192.125 – 10.78.192.125	10.78.192.125
127	10.78.192.126/32	10.78.192.126 – 10.78.192.126	10.78.192.126
128	10.78.192.127/32	10.78.192.127 – 10.78.192.127	10.78.192.127
129	10.78.192.128/32	10.78.192.128 – 10.78.192.128	10.78.192.128
130	10.78.192.129/32	10.78.192.129 – 10.78.192.129	10.78.192.129
131	10.78.192.130/32	10.78.192.130 – 10.78.192.130	10.78.192.130
132	10.78.192.131/32	10.78.192.131 – 10.78.192.131	10.78.192.131
133	10.78.192.132/32	10.78.192.132 – 10.78.192.132	10.78.192.132
134	10.78.192.133/32	10.78.192.133 – 10.78.192.133	10.78.192.133
135	10.78.192.134/32	10.78.192.134 – 10.78.192.134	10.78.192.134
136	10.78.192.135/32	10.78.192.135 – 10.78.192.135	10.78.192.135
137	10.78.192.136/32	10.78.192.136 – 10.78.192.136	10.78.192.136
138	10.78.192.137/32	10.78.192.137 – 10.78.192.137	10.78.192.137
139	10.78.192.138/32	10.78.192.138 – 10.78.192.138	10.78.192.138
140	10.78.192.139/32	10.78.192.139 – 10.78.192.139	10.78.192.139
141	10.78.192.140/32	10.78.192.140 – 10.78.192.140	10.78.192.140
142	10.78.192.141/32	10.78.192.141 – 10.78.192.141	10.78.192.141
143	10.78.192.142/32	10.78.192.142 – 10.78.192.142	10.78.192.142
144	10.78.192.143/32	10.78.192.143 – 10.78.192.143	10.78.192.143
145	10.78.192.144/32	10.78.192.144 – 10.78.192.144	10.78.192.144
146	10.78.192.145/32	10.78.192.145 – 10.78.192.145	10.78.192.145
147	10.78.192.146/32	10.78.192.146 – 10.78.192.146	10.78.192.146
148	10.78.192.147/32	10.78.192.147 – 10.78.192.147	10.78.192.147
149	10.78.192.148/32	10.78.192.148 – 10.78.192.148	10.78.192.148
150	10.78.192.149/32	10.78.192.149 – 10.78.192.149	10.78.192.149
151	10.78.192.150/32	10.78.192.150 – 10.78.192.150	10.78.192.150
152	10.78.192.151/32	10.78.192.151 – 10.78.192.151	10.78.192.151
153	10.78.192.152/32	10.78.192.152 – 10.78.192.152	10.78.192.152
154	10.78.192.153/32	10.78.192.153 – 10.78.192.153	10.78.192.153
155	10.78.192.154/32	10.78.192.154 – 10.78.192.154	10.78.192.154
156	10.78.192.155/32	10.78.192.155 – 10.78.192.155	10.78.192.155
157	10.78.192.156/32	10.78.192.156 – 10.78.192.156	10.78.192.156
158	10.78.192.157/32	10.78.192.157 – 10.78.192.157	10.78.192.157
159	10.78.192.158/32	10.78.192.158 – 10.78.192.158	10.78.192.158
160	10.78.192.159/32	10.78.192.159 – 10.78.192.159	10.78.192.159
161	10.78.192.160/32	10.78.192.160 – 10.78.192.160	10.78.192.160
162	10.78.192.161/32	10.78.192.161 – 10.78.192.161	10.78.192.161
163	10.78.192.162/32	10.78.192.162 – 10.78.192.162	10.78.192.162
164	10.78.192.163/32	10.78.192.163 – 10.78.192.163	10.78.192.163
165	10.78.192.164/32	10.78.192.164 – 10.78.192.164	10.78.192.164
166	10.78.192.165/32	10.78.192.165 – 10.78.192.165	10.78.192.165
167	10.78.192.166/32	10.78.192.166 – 10.78.192.166	10.78.192.166
168	10.78.192.167/32	10.78.192.167 – 10.78.192.167	10.78.192.167
169	10.78.192.168/32	10.78.192.168 – 10.78.192.168	10.78.192.168
170	10.78.192.169/32	10.78.192.169 – 10.78.192.169	10.78.192.169
171	10.78.192.170/32	10.78.192.170 – 10.78.192.170	10.78.192.170
172	10.78.192.171/32	10.78.192.171 – 10.78.192.171	10.78.192.171
173	10.78.192.172/32	10.78.192.172 – 10.78.192.172	10.78.192.172
174	10.78.192.173/32	10.78.192.173 – 10.78.192.173	10.78.192.173
175	10.78.192.174/32	10.78.192.174 – 10.78.192.174	10.78.192.174
176	10.78.192.175/32	10.78.192.175 – 10.78.192.175	10.78.192.175
177	10.78.192.176/32	10.78.192.176 – 10.78.192.176	10.78.192.176
178	10.78.192.177/32	10.78.192.177 – 10.78.192.177	10.78.192.177
179	10.78.192.178/32	10.78.192.178 – 10.78.192.178	10.78.192.178
180	10.78.192.179/32	10.78.192.179 – 10.78.192.179	10.78.192.179
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190	10.78.192.189/32	10.78.192.189 – 10.78.192.189	10.78.192.189
191	10.78.192.190/32	10.78.192.190 – 10.78.192.190	10.78.192.190
192	10.78.192.191/32	10.78.192.191 – 10.78.192.191	10.78.192.191
193	10.78.192.192/32	10.78.192.192 – 10.78.192.192	10.78.192.192
194	10.78.192.193/32	10.78.192.193 – 10.78.192.193	10.78.192.193
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196	10.78.192.195/32	10.78.192.195 – 10.78.192.195	10.78.192.195
197	10.78.192.196/32	10.78.192.196 – 10.78.192.196	10.78.192.196
198	10.78.192.197/32	10.78.192.197 – 10.78.192.197	10.78.192.197
199	10.78.192.198/32	10.78.192.198 – 10.78.192.198	10.78.192.198
200	10.78.192.199/32	10.78.192.199 – 10.78.192.199	10.78.192.199
201	10.78.192.200/32	10.78.192.200 – 10.78.192.200	10.78.192.200
202	10.78.192.201/32	10.78.192.201 – 10.78.192.201	10.78.192.201
203	10.78.192.202/32	10.78.192.202 – 10.78.192.202	10.78.192.202
204	10.78.192.203/32	10.78.192.203 – 10.78.192.203	10.78.192.203
205	10.78.192.204/32	10.78.192.204 – 10.78.192.204	10.78.192.204
206	10.78.192.205/32	10.78.192.205 – 10.78.192.205	10.78.192.205
207	10.78.192.206/32	10.78.192.206 – 10.78.192.206	10.78.192.206
208	10.78.192.207/32	10.78.192.207 – 10.78.192.207	10.78.192.207
209	10.78.192.208/32	10.78.192.208 – 10.78.192.208	10.78.192.208
210	10.78.192.209/32	10.78.192.209 – 10.78.192.209	10.78.192.209
211	10.78.192.210/32	10.78.192.210 – 10.78.192.210	10.78.192.210
212	10.78.192.211/32	10.78.192.211 – 10.78.192.211	10.78.192.211
213	10.78.192.212/32	10.78.192.212 – 10.78.192.212	10.78.192.212
214	10.78.192.213/32	10.78.192.213 – 10.78.192.213	10.78.192.213
215	10.78.192.214/32	10.78.192.214 – 10.78.192.214	10.78.192.214
216	10.78.192.215/32	10.78.192.215 – 10.78.192.215	10.78.192.215
217	10.78.192.216/32	10.78.192.216 – 10.78.192.216	10.78.192.216
218	10.78.192.217/32	10.78.192.217 – 10.78.192.217	10.78.192.217
219	10.78.192.218/32	10.78.192.218 – 10.78.192.218	10.78.192.218
220	10.78.192.219/32	10.78.192.219 – 10.78.192.219	10.78.192.219
221	10.78.192.220/32	10.78.192.220 – 10.78.192.220	10.78.192.220
222	10.78.192.221/32	10.78.192.221 – 10.78.192.221	10.78.192.221
223	10.78.192.222/32	10.78.192.222 – 10.78.192.222	10.78.192.222
224	10.78.192.223/32	10.78.192.223 – 10.78.192.223	10.78.192.223
225	10.78.192.224/32	10.78.192.224 – 10.78.192.224	10.78.192.224
226	10.78.192.225/32	10.78.192.225 – 10.78.192.225	10.78.192.225
227	10.78.192.226/32	10.78.192.226 – 10.78.192.226	10.78.192.226
228	10.78.192.227/32	10.78.192.227 – 10.78.192.227	10.78.192.227
229	10.78.192.228/32	10.78.192.228 – 10.78.192.228	10.78.192.228
230	10.78.192.229/32	10.78.192.229 – 10.78.192.229	10.78.192.229
231	10.78.192.230/32	10.78.192.230 – 10.78.192.230	10.78.192.230
232	10.78.192.231/32	10.78.192.231 – 10.78.192.231	10.78.192.231
233	10.78.192.232/32	10.78.192.232 – 10.78.192.232	10.78.192.232
234	10.78.192.233/32	10.78.192.233 – 10.78.192.233	10.78.192.233
235	10.78.192.234/32	10.78.192.234 – 10.78.192.234	10.78.192.234
236	10.78.192.235/32	10.78.192.235 – 10.78.192.235	10.78.192.235
237	10.78.192.236/32	10.78.192.236 – 10.78.192.236	10.78.192.236
238	10.78.192.237/32	10.78.192.237 – 10.78.192.237	10.78.192.237
239	10.78.192.238/32	10.78.192.238 – 10.78.192.238	10.78.192.238
240	10.78.192.239/32	10.78.192.239 – 10.78.192.239	10.78.192.239
241	10.78.192.240/32	10.78.192.240 – 10.78.192.240	10.78.192.240
242	10.78.192.241/32	10.78.192.241 – 10.78.192.241	10.78.192.241
243	10.78.192.242/32	10.78.192.242 – 10.78.192.242	10.78.192.242
244	10.78.192.243/32	10.78.192.243 – 10.78.192.243	10.78.192.243
245	10.78.192.244/32	10.78.192.244 – 10.78.192.244	10.78.192.244
246	10.78.192.245/32	10.78.192.245 – 10.78.192.245	10.78.192.245
247	10.78.192.246/32	10.78.192.246 – 10.78.192.246	10.78.192.246
248	10.78.192.247/32	10.78.192.247 – 10.78.192.247	10.78.192.247
249	10.78.192.248/32	10.78.192.248 – 10.78.192.248	10.78.192.248
250	10.78.192.249/32	10.78.192.249 – 10.78.192.249	10.78.192.249
251	10.78.192.250/32	10.78.192.250 – 10.78.192.250	10.78.192.250
252	10.78.192.251/32	10.78.192.251 – 10.78.192.251	10.78.192.251
253	10.78.192.252/32	10.78.192.252 – 10.78.192.252	10.78.192.252
254	10.78.192.253/32	10.78.192.253 – 10.78.192.253	10.78.192.253
255	10.78.192.254/32	10.78.192.254 – 10.78.192.254	10.78.192.254
256	10.78.192.255/32	10.78.192.255 – 10.78.192.255	10.78.192.255

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