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)10.78.66.0/24

network10.78.66.0/24

broadcast10.78.66.255

first host10.78.66.1

last host10.78.66.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.78.66.0/24

address00001010.01001110.01000010.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.01001110.01000010.00000000

broadcast00001010.01001110.01000010.11111111

green = network part, grey = host part

hex0x0a4e4200

decimal172900864

reverse dns0.66.78.10.in-addr.arpa

ipv4-mapped::ffff:a4e:4200

/24 split into /32 · 256 subnets

close ×

#	network	host range	broadcast
1	10.78.66.0/32	10.78.66.0 – 10.78.66.0	10.78.66.0
2	10.78.66.1/32	10.78.66.1 – 10.78.66.1	10.78.66.1
3	10.78.66.2/32	10.78.66.2 – 10.78.66.2	10.78.66.2
4	10.78.66.3/32	10.78.66.3 – 10.78.66.3	10.78.66.3
5	10.78.66.4/32	10.78.66.4 – 10.78.66.4	10.78.66.4
6	10.78.66.5/32	10.78.66.5 – 10.78.66.5	10.78.66.5
7	10.78.66.6/32	10.78.66.6 – 10.78.66.6	10.78.66.6
8	10.78.66.7/32	10.78.66.7 – 10.78.66.7	10.78.66.7
9	10.78.66.8/32	10.78.66.8 – 10.78.66.8	10.78.66.8
10	10.78.66.9/32	10.78.66.9 – 10.78.66.9	10.78.66.9
11	10.78.66.10/32	10.78.66.10 – 10.78.66.10	10.78.66.10
12	10.78.66.11/32	10.78.66.11 – 10.78.66.11	10.78.66.11
13	10.78.66.12/32	10.78.66.12 – 10.78.66.12	10.78.66.12
14	10.78.66.13/32	10.78.66.13 – 10.78.66.13	10.78.66.13
15	10.78.66.14/32	10.78.66.14 – 10.78.66.14	10.78.66.14
16	10.78.66.15/32	10.78.66.15 – 10.78.66.15	10.78.66.15
17	10.78.66.16/32	10.78.66.16 – 10.78.66.16	10.78.66.16
18	10.78.66.17/32	10.78.66.17 – 10.78.66.17	10.78.66.17
19	10.78.66.18/32	10.78.66.18 – 10.78.66.18	10.78.66.18
20	10.78.66.19/32	10.78.66.19 – 10.78.66.19	10.78.66.19
21	10.78.66.20/32	10.78.66.20 – 10.78.66.20	10.78.66.20
22	10.78.66.21/32	10.78.66.21 – 10.78.66.21	10.78.66.21
23	10.78.66.22/32	10.78.66.22 – 10.78.66.22	10.78.66.22
24	10.78.66.23/32	10.78.66.23 – 10.78.66.23	10.78.66.23
25	10.78.66.24/32	10.78.66.24 – 10.78.66.24	10.78.66.24
26	10.78.66.25/32	10.78.66.25 – 10.78.66.25	10.78.66.25
27	10.78.66.26/32	10.78.66.26 – 10.78.66.26	10.78.66.26
28	10.78.66.27/32	10.78.66.27 – 10.78.66.27	10.78.66.27
29	10.78.66.28/32	10.78.66.28 – 10.78.66.28	10.78.66.28
30	10.78.66.29/32	10.78.66.29 – 10.78.66.29	10.78.66.29
31	10.78.66.30/32	10.78.66.30 – 10.78.66.30	10.78.66.30
32	10.78.66.31/32	10.78.66.31 – 10.78.66.31	10.78.66.31
33	10.78.66.32/32	10.78.66.32 – 10.78.66.32	10.78.66.32
34	10.78.66.33/32	10.78.66.33 – 10.78.66.33	10.78.66.33
35	10.78.66.34/32	10.78.66.34 – 10.78.66.34	10.78.66.34
36	10.78.66.35/32	10.78.66.35 – 10.78.66.35	10.78.66.35
37	10.78.66.36/32	10.78.66.36 – 10.78.66.36	10.78.66.36
38	10.78.66.37/32	10.78.66.37 – 10.78.66.37	10.78.66.37
39	10.78.66.38/32	10.78.66.38 – 10.78.66.38	10.78.66.38
40	10.78.66.39/32	10.78.66.39 – 10.78.66.39	10.78.66.39
41	10.78.66.40/32	10.78.66.40 – 10.78.66.40	10.78.66.40
42	10.78.66.41/32	10.78.66.41 – 10.78.66.41	10.78.66.41
43	10.78.66.42/32	10.78.66.42 – 10.78.66.42	10.78.66.42
44	10.78.66.43/32	10.78.66.43 – 10.78.66.43	10.78.66.43
45	10.78.66.44/32	10.78.66.44 – 10.78.66.44	10.78.66.44
46	10.78.66.45/32	10.78.66.45 – 10.78.66.45	10.78.66.45
47	10.78.66.46/32	10.78.66.46 – 10.78.66.46	10.78.66.46
48	10.78.66.47/32	10.78.66.47 – 10.78.66.47	10.78.66.47
49	10.78.66.48/32	10.78.66.48 – 10.78.66.48	10.78.66.48
50	10.78.66.49/32	10.78.66.49 – 10.78.66.49	10.78.66.49
51	10.78.66.50/32	10.78.66.50 – 10.78.66.50	10.78.66.50
52	10.78.66.51/32	10.78.66.51 – 10.78.66.51	10.78.66.51
53	10.78.66.52/32	10.78.66.52 – 10.78.66.52	10.78.66.52
54	10.78.66.53/32	10.78.66.53 – 10.78.66.53	10.78.66.53
55	10.78.66.54/32	10.78.66.54 – 10.78.66.54	10.78.66.54
56	10.78.66.55/32	10.78.66.55 – 10.78.66.55	10.78.66.55
57	10.78.66.56/32	10.78.66.56 – 10.78.66.56	10.78.66.56
58	10.78.66.57/32	10.78.66.57 – 10.78.66.57	10.78.66.57
59	10.78.66.58/32	10.78.66.58 – 10.78.66.58	10.78.66.58
60	10.78.66.59/32	10.78.66.59 – 10.78.66.59	10.78.66.59
61	10.78.66.60/32	10.78.66.60 – 10.78.66.60	10.78.66.60
62	10.78.66.61/32	10.78.66.61 – 10.78.66.61	10.78.66.61
63	10.78.66.62/32	10.78.66.62 – 10.78.66.62	10.78.66.62
64	10.78.66.63/32	10.78.66.63 – 10.78.66.63	10.78.66.63
65	10.78.66.64/32	10.78.66.64 – 10.78.66.64	10.78.66.64
66	10.78.66.65/32	10.78.66.65 – 10.78.66.65	10.78.66.65
67	10.78.66.66/32	10.78.66.66 – 10.78.66.66	10.78.66.66
68	10.78.66.67/32	10.78.66.67 – 10.78.66.67	10.78.66.67
69	10.78.66.68/32	10.78.66.68 – 10.78.66.68	10.78.66.68
70	10.78.66.69/32	10.78.66.69 – 10.78.66.69	10.78.66.69
71	10.78.66.70/32	10.78.66.70 – 10.78.66.70	10.78.66.70
72	10.78.66.71/32	10.78.66.71 – 10.78.66.71	10.78.66.71
73	10.78.66.72/32	10.78.66.72 – 10.78.66.72	10.78.66.72
74	10.78.66.73/32	10.78.66.73 – 10.78.66.73	10.78.66.73
75	10.78.66.74/32	10.78.66.74 – 10.78.66.74	10.78.66.74
76	10.78.66.75/32	10.78.66.75 – 10.78.66.75	10.78.66.75
77	10.78.66.76/32	10.78.66.76 – 10.78.66.76	10.78.66.76
78	10.78.66.77/32	10.78.66.77 – 10.78.66.77	10.78.66.77
79	10.78.66.78/32	10.78.66.78 – 10.78.66.78	10.78.66.78
80	10.78.66.79/32	10.78.66.79 – 10.78.66.79	10.78.66.79
81	10.78.66.80/32	10.78.66.80 – 10.78.66.80	10.78.66.80
82	10.78.66.81/32	10.78.66.81 – 10.78.66.81	10.78.66.81
83	10.78.66.82/32	10.78.66.82 – 10.78.66.82	10.78.66.82
84	10.78.66.83/32	10.78.66.83 – 10.78.66.83	10.78.66.83
85	10.78.66.84/32	10.78.66.84 – 10.78.66.84	10.78.66.84
86	10.78.66.85/32	10.78.66.85 – 10.78.66.85	10.78.66.85
87	10.78.66.86/32	10.78.66.86 – 10.78.66.86	10.78.66.86
88	10.78.66.87/32	10.78.66.87 – 10.78.66.87	10.78.66.87
89	10.78.66.88/32	10.78.66.88 – 10.78.66.88	10.78.66.88
90	10.78.66.89/32	10.78.66.89 – 10.78.66.89	10.78.66.89
91	10.78.66.90/32	10.78.66.90 – 10.78.66.90	10.78.66.90
92	10.78.66.91/32	10.78.66.91 – 10.78.66.91	10.78.66.91
93	10.78.66.92/32	10.78.66.92 – 10.78.66.92	10.78.66.92
94	10.78.66.93/32	10.78.66.93 – 10.78.66.93	10.78.66.93
95	10.78.66.94/32	10.78.66.94 – 10.78.66.94	10.78.66.94
96	10.78.66.95/32	10.78.66.95 – 10.78.66.95	10.78.66.95
97	10.78.66.96/32	10.78.66.96 – 10.78.66.96	10.78.66.96
98	10.78.66.97/32	10.78.66.97 – 10.78.66.97	10.78.66.97
99	10.78.66.98/32	10.78.66.98 – 10.78.66.98	10.78.66.98
100	10.78.66.99/32	10.78.66.99 – 10.78.66.99	10.78.66.99
101	10.78.66.100/32	10.78.66.100 – 10.78.66.100	10.78.66.100
102	10.78.66.101/32	10.78.66.101 – 10.78.66.101	10.78.66.101
103	10.78.66.102/32	10.78.66.102 – 10.78.66.102	10.78.66.102
104	10.78.66.103/32	10.78.66.103 – 10.78.66.103	10.78.66.103
105	10.78.66.104/32	10.78.66.104 – 10.78.66.104	10.78.66.104
106	10.78.66.105/32	10.78.66.105 – 10.78.66.105	10.78.66.105
107	10.78.66.106/32	10.78.66.106 – 10.78.66.106	10.78.66.106
108	10.78.66.107/32	10.78.66.107 – 10.78.66.107	10.78.66.107
109	10.78.66.108/32	10.78.66.108 – 10.78.66.108	10.78.66.108
110	10.78.66.109/32	10.78.66.109 – 10.78.66.109	10.78.66.109
111	10.78.66.110/32	10.78.66.110 – 10.78.66.110	10.78.66.110
112	10.78.66.111/32	10.78.66.111 – 10.78.66.111	10.78.66.111
113	10.78.66.112/32	10.78.66.112 – 10.78.66.112	10.78.66.112
114	10.78.66.113/32	10.78.66.113 – 10.78.66.113	10.78.66.113
115	10.78.66.114/32	10.78.66.114 – 10.78.66.114	10.78.66.114
116	10.78.66.115/32	10.78.66.115 – 10.78.66.115	10.78.66.115
117	10.78.66.116/32	10.78.66.116 – 10.78.66.116	10.78.66.116
118	10.78.66.117/32	10.78.66.117 – 10.78.66.117	10.78.66.117
119	10.78.66.118/32	10.78.66.118 – 10.78.66.118	10.78.66.118
120	10.78.66.119/32	10.78.66.119 – 10.78.66.119	10.78.66.119
121	10.78.66.120/32	10.78.66.120 – 10.78.66.120	10.78.66.120
122	10.78.66.121/32	10.78.66.121 – 10.78.66.121	10.78.66.121
123	10.78.66.122/32	10.78.66.122 – 10.78.66.122	10.78.66.122
124	10.78.66.123/32	10.78.66.123 – 10.78.66.123	10.78.66.123
125	10.78.66.124/32	10.78.66.124 – 10.78.66.124	10.78.66.124
126	10.78.66.125/32	10.78.66.125 – 10.78.66.125	10.78.66.125
127	10.78.66.126/32	10.78.66.126 – 10.78.66.126	10.78.66.126
128	10.78.66.127/32	10.78.66.127 – 10.78.66.127	10.78.66.127
129	10.78.66.128/32	10.78.66.128 – 10.78.66.128	10.78.66.128
130	10.78.66.129/32	10.78.66.129 – 10.78.66.129	10.78.66.129
131	10.78.66.130/32	10.78.66.130 – 10.78.66.130	10.78.66.130
132	10.78.66.131/32	10.78.66.131 – 10.78.66.131	10.78.66.131
133	10.78.66.132/32	10.78.66.132 – 10.78.66.132	10.78.66.132
134	10.78.66.133/32	10.78.66.133 – 10.78.66.133	10.78.66.133
135	10.78.66.134/32	10.78.66.134 – 10.78.66.134	10.78.66.134
136	10.78.66.135/32	10.78.66.135 – 10.78.66.135	10.78.66.135
137	10.78.66.136/32	10.78.66.136 – 10.78.66.136	10.78.66.136
138	10.78.66.137/32	10.78.66.137 – 10.78.66.137	10.78.66.137
139	10.78.66.138/32	10.78.66.138 – 10.78.66.138	10.78.66.138
140	10.78.66.139/32	10.78.66.139 – 10.78.66.139	10.78.66.139
141	10.78.66.140/32	10.78.66.140 – 10.78.66.140	10.78.66.140
142	10.78.66.141/32	10.78.66.141 – 10.78.66.141	10.78.66.141
143	10.78.66.142/32	10.78.66.142 – 10.78.66.142	10.78.66.142
144	10.78.66.143/32	10.78.66.143 – 10.78.66.143	10.78.66.143
145	10.78.66.144/32	10.78.66.144 – 10.78.66.144	10.78.66.144
146	10.78.66.145/32	10.78.66.145 – 10.78.66.145	10.78.66.145
147	10.78.66.146/32	10.78.66.146 – 10.78.66.146	10.78.66.146
148	10.78.66.147/32	10.78.66.147 – 10.78.66.147	10.78.66.147
149	10.78.66.148/32	10.78.66.148 – 10.78.66.148	10.78.66.148
150	10.78.66.149/32	10.78.66.149 – 10.78.66.149	10.78.66.149
151	10.78.66.150/32	10.78.66.150 – 10.78.66.150	10.78.66.150
152	10.78.66.151/32	10.78.66.151 – 10.78.66.151	10.78.66.151
153	10.78.66.152/32	10.78.66.152 – 10.78.66.152	10.78.66.152
154	10.78.66.153/32	10.78.66.153 – 10.78.66.153	10.78.66.153
155	10.78.66.154/32	10.78.66.154 – 10.78.66.154	10.78.66.154
156	10.78.66.155/32	10.78.66.155 – 10.78.66.155	10.78.66.155
157	10.78.66.156/32	10.78.66.156 – 10.78.66.156	10.78.66.156
158	10.78.66.157/32	10.78.66.157 – 10.78.66.157	10.78.66.157
159	10.78.66.158/32	10.78.66.158 – 10.78.66.158	10.78.66.158
160	10.78.66.159/32	10.78.66.159 – 10.78.66.159	10.78.66.159
161	10.78.66.160/32	10.78.66.160 – 10.78.66.160	10.78.66.160
162	10.78.66.161/32	10.78.66.161 – 10.78.66.161	10.78.66.161
163	10.78.66.162/32	10.78.66.162 – 10.78.66.162	10.78.66.162
164	10.78.66.163/32	10.78.66.163 – 10.78.66.163	10.78.66.163
165	10.78.66.164/32	10.78.66.164 – 10.78.66.164	10.78.66.164
166	10.78.66.165/32	10.78.66.165 – 10.78.66.165	10.78.66.165
167	10.78.66.166/32	10.78.66.166 – 10.78.66.166	10.78.66.166
168	10.78.66.167/32	10.78.66.167 – 10.78.66.167	10.78.66.167
169	10.78.66.168/32	10.78.66.168 – 10.78.66.168	10.78.66.168
170	10.78.66.169/32	10.78.66.169 – 10.78.66.169	10.78.66.169
171	10.78.66.170/32	10.78.66.170 – 10.78.66.170	10.78.66.170
172	10.78.66.171/32	10.78.66.171 – 10.78.66.171	10.78.66.171
173	10.78.66.172/32	10.78.66.172 – 10.78.66.172	10.78.66.172
174	10.78.66.173/32	10.78.66.173 – 10.78.66.173	10.78.66.173
175	10.78.66.174/32	10.78.66.174 – 10.78.66.174	10.78.66.174
176	10.78.66.175/32	10.78.66.175 – 10.78.66.175	10.78.66.175
177	10.78.66.176/32	10.78.66.176 – 10.78.66.176	10.78.66.176
178	10.78.66.177/32	10.78.66.177 – 10.78.66.177	10.78.66.177
179	10.78.66.178/32	10.78.66.178 – 10.78.66.178	10.78.66.178
180	10.78.66.179/32	10.78.66.179 – 10.78.66.179	10.78.66.179
181	10.78.66.180/32	10.78.66.180 – 10.78.66.180	10.78.66.180
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188	10.78.66.187/32	10.78.66.187 – 10.78.66.187	10.78.66.187
189	10.78.66.188/32	10.78.66.188 – 10.78.66.188	10.78.66.188
190	10.78.66.189/32	10.78.66.189 – 10.78.66.189	10.78.66.189
191	10.78.66.190/32	10.78.66.190 – 10.78.66.190	10.78.66.190
192	10.78.66.191/32	10.78.66.191 – 10.78.66.191	10.78.66.191
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196	10.78.66.195/32	10.78.66.195 – 10.78.66.195	10.78.66.195
197	10.78.66.196/32	10.78.66.196 – 10.78.66.196	10.78.66.196
198	10.78.66.197/32	10.78.66.197 – 10.78.66.197	10.78.66.197
199	10.78.66.198/32	10.78.66.198 – 10.78.66.198	10.78.66.198
200	10.78.66.199/32	10.78.66.199 – 10.78.66.199	10.78.66.199
201	10.78.66.200/32	10.78.66.200 – 10.78.66.200	10.78.66.200
202	10.78.66.201/32	10.78.66.201 – 10.78.66.201	10.78.66.201
203	10.78.66.202/32	10.78.66.202 – 10.78.66.202	10.78.66.202
204	10.78.66.203/32	10.78.66.203 – 10.78.66.203	10.78.66.203
205	10.78.66.204/32	10.78.66.204 – 10.78.66.204	10.78.66.204
206	10.78.66.205/32	10.78.66.205 – 10.78.66.205	10.78.66.205
207	10.78.66.206/32	10.78.66.206 – 10.78.66.206	10.78.66.206
208	10.78.66.207/32	10.78.66.207 – 10.78.66.207	10.78.66.207
209	10.78.66.208/32	10.78.66.208 – 10.78.66.208	10.78.66.208
210	10.78.66.209/32	10.78.66.209 – 10.78.66.209	10.78.66.209
211	10.78.66.210/32	10.78.66.210 – 10.78.66.210	10.78.66.210
212	10.78.66.211/32	10.78.66.211 – 10.78.66.211	10.78.66.211
213	10.78.66.212/32	10.78.66.212 – 10.78.66.212	10.78.66.212
214	10.78.66.213/32	10.78.66.213 – 10.78.66.213	10.78.66.213
215	10.78.66.214/32	10.78.66.214 – 10.78.66.214	10.78.66.214
216	10.78.66.215/32	10.78.66.215 – 10.78.66.215	10.78.66.215
217	10.78.66.216/32	10.78.66.216 – 10.78.66.216	10.78.66.216
218	10.78.66.217/32	10.78.66.217 – 10.78.66.217	10.78.66.217
219	10.78.66.218/32	10.78.66.218 – 10.78.66.218	10.78.66.218
220	10.78.66.219/32	10.78.66.219 – 10.78.66.219	10.78.66.219
221	10.78.66.220/32	10.78.66.220 – 10.78.66.220	10.78.66.220
222	10.78.66.221/32	10.78.66.221 – 10.78.66.221	10.78.66.221
223	10.78.66.222/32	10.78.66.222 – 10.78.66.222	10.78.66.222
224	10.78.66.223/32	10.78.66.223 – 10.78.66.223	10.78.66.223
225	10.78.66.224/32	10.78.66.224 – 10.78.66.224	10.78.66.224
226	10.78.66.225/32	10.78.66.225 – 10.78.66.225	10.78.66.225
227	10.78.66.226/32	10.78.66.226 – 10.78.66.226	10.78.66.226
228	10.78.66.227/32	10.78.66.227 – 10.78.66.227	10.78.66.227
229	10.78.66.228/32	10.78.66.228 – 10.78.66.228	10.78.66.228
230	10.78.66.229/32	10.78.66.229 – 10.78.66.229	10.78.66.229
231	10.78.66.230/32	10.78.66.230 – 10.78.66.230	10.78.66.230
232	10.78.66.231/32	10.78.66.231 – 10.78.66.231	10.78.66.231
233	10.78.66.232/32	10.78.66.232 – 10.78.66.232	10.78.66.232
234	10.78.66.233/32	10.78.66.233 – 10.78.66.233	10.78.66.233
235	10.78.66.234/32	10.78.66.234 – 10.78.66.234	10.78.66.234
236	10.78.66.235/32	10.78.66.235 – 10.78.66.235	10.78.66.235
237	10.78.66.236/32	10.78.66.236 – 10.78.66.236	10.78.66.236
238	10.78.66.237/32	10.78.66.237 – 10.78.66.237	10.78.66.237
239	10.78.66.238/32	10.78.66.238 – 10.78.66.238	10.78.66.238
240	10.78.66.239/32	10.78.66.239 – 10.78.66.239	10.78.66.239
241	10.78.66.240/32	10.78.66.240 – 10.78.66.240	10.78.66.240
242	10.78.66.241/32	10.78.66.241 – 10.78.66.241	10.78.66.241
243	10.78.66.242/32	10.78.66.242 – 10.78.66.242	10.78.66.242
244	10.78.66.243/32	10.78.66.243 – 10.78.66.243	10.78.66.243
245	10.78.66.244/32	10.78.66.244 – 10.78.66.244	10.78.66.244
246	10.78.66.245/32	10.78.66.245 – 10.78.66.245	10.78.66.245
247	10.78.66.246/32	10.78.66.246 – 10.78.66.246	10.78.66.246
248	10.78.66.247/32	10.78.66.247 – 10.78.66.247	10.78.66.247
249	10.78.66.248/32	10.78.66.248 – 10.78.66.248	10.78.66.248
250	10.78.66.249/32	10.78.66.249 – 10.78.66.249	10.78.66.249
251	10.78.66.250/32	10.78.66.250 – 10.78.66.250	10.78.66.250
252	10.78.66.251/32	10.78.66.251 – 10.78.66.251	10.78.66.251
253	10.78.66.252/32	10.78.66.252 – 10.78.66.252	10.78.66.252
254	10.78.66.253/32	10.78.66.253 – 10.78.66.253	10.78.66.253
255	10.78.66.254/32	10.78.66.254 – 10.78.66.254	10.78.66.254
256	10.78.66.255/32	10.78.66.255 – 10.78.66.255	10.78.66.255

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 →