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)10.0.25.0/24

network10.0.25.0/24

broadcast10.0.25.255

first host10.0.25.1

last host10.0.25.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.0.25.0/24

address00001010.00000000.00011001.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.00000000.00011001.00000000

broadcast00001010.00000000.00011001.11111111

green = network part, grey = host part

hex0x0a001900

decimal167778560

reverse dns0.25.0.10.in-addr.arpa

ipv4-mapped::ffff:a00:1900

/24 split into /32 · 256 subnets

close ×

#	network	host range	broadcast
1	10.0.25.0/32	10.0.25.0 – 10.0.25.0	10.0.25.0
2	10.0.25.1/32	10.0.25.1 – 10.0.25.1	10.0.25.1
3	10.0.25.2/32	10.0.25.2 – 10.0.25.2	10.0.25.2
4	10.0.25.3/32	10.0.25.3 – 10.0.25.3	10.0.25.3
5	10.0.25.4/32	10.0.25.4 – 10.0.25.4	10.0.25.4
6	10.0.25.5/32	10.0.25.5 – 10.0.25.5	10.0.25.5
7	10.0.25.6/32	10.0.25.6 – 10.0.25.6	10.0.25.6
8	10.0.25.7/32	10.0.25.7 – 10.0.25.7	10.0.25.7
9	10.0.25.8/32	10.0.25.8 – 10.0.25.8	10.0.25.8
10	10.0.25.9/32	10.0.25.9 – 10.0.25.9	10.0.25.9
11	10.0.25.10/32	10.0.25.10 – 10.0.25.10	10.0.25.10
12	10.0.25.11/32	10.0.25.11 – 10.0.25.11	10.0.25.11
13	10.0.25.12/32	10.0.25.12 – 10.0.25.12	10.0.25.12
14	10.0.25.13/32	10.0.25.13 – 10.0.25.13	10.0.25.13
15	10.0.25.14/32	10.0.25.14 – 10.0.25.14	10.0.25.14
16	10.0.25.15/32	10.0.25.15 – 10.0.25.15	10.0.25.15
17	10.0.25.16/32	10.0.25.16 – 10.0.25.16	10.0.25.16
18	10.0.25.17/32	10.0.25.17 – 10.0.25.17	10.0.25.17
19	10.0.25.18/32	10.0.25.18 – 10.0.25.18	10.0.25.18
20	10.0.25.19/32	10.0.25.19 – 10.0.25.19	10.0.25.19
21	10.0.25.20/32	10.0.25.20 – 10.0.25.20	10.0.25.20
22	10.0.25.21/32	10.0.25.21 – 10.0.25.21	10.0.25.21
23	10.0.25.22/32	10.0.25.22 – 10.0.25.22	10.0.25.22
24	10.0.25.23/32	10.0.25.23 – 10.0.25.23	10.0.25.23
25	10.0.25.24/32	10.0.25.24 – 10.0.25.24	10.0.25.24
26	10.0.25.25/32	10.0.25.25 – 10.0.25.25	10.0.25.25
27	10.0.25.26/32	10.0.25.26 – 10.0.25.26	10.0.25.26
28	10.0.25.27/32	10.0.25.27 – 10.0.25.27	10.0.25.27
29	10.0.25.28/32	10.0.25.28 – 10.0.25.28	10.0.25.28
30	10.0.25.29/32	10.0.25.29 – 10.0.25.29	10.0.25.29
31	10.0.25.30/32	10.0.25.30 – 10.0.25.30	10.0.25.30
32	10.0.25.31/32	10.0.25.31 – 10.0.25.31	10.0.25.31
33	10.0.25.32/32	10.0.25.32 – 10.0.25.32	10.0.25.32
34	10.0.25.33/32	10.0.25.33 – 10.0.25.33	10.0.25.33
35	10.0.25.34/32	10.0.25.34 – 10.0.25.34	10.0.25.34
36	10.0.25.35/32	10.0.25.35 – 10.0.25.35	10.0.25.35
37	10.0.25.36/32	10.0.25.36 – 10.0.25.36	10.0.25.36
38	10.0.25.37/32	10.0.25.37 – 10.0.25.37	10.0.25.37
39	10.0.25.38/32	10.0.25.38 – 10.0.25.38	10.0.25.38
40	10.0.25.39/32	10.0.25.39 – 10.0.25.39	10.0.25.39
41	10.0.25.40/32	10.0.25.40 – 10.0.25.40	10.0.25.40
42	10.0.25.41/32	10.0.25.41 – 10.0.25.41	10.0.25.41
43	10.0.25.42/32	10.0.25.42 – 10.0.25.42	10.0.25.42
44	10.0.25.43/32	10.0.25.43 – 10.0.25.43	10.0.25.43
45	10.0.25.44/32	10.0.25.44 – 10.0.25.44	10.0.25.44
46	10.0.25.45/32	10.0.25.45 – 10.0.25.45	10.0.25.45
47	10.0.25.46/32	10.0.25.46 – 10.0.25.46	10.0.25.46
48	10.0.25.47/32	10.0.25.47 – 10.0.25.47	10.0.25.47
49	10.0.25.48/32	10.0.25.48 – 10.0.25.48	10.0.25.48
50	10.0.25.49/32	10.0.25.49 – 10.0.25.49	10.0.25.49
51	10.0.25.50/32	10.0.25.50 – 10.0.25.50	10.0.25.50
52	10.0.25.51/32	10.0.25.51 – 10.0.25.51	10.0.25.51
53	10.0.25.52/32	10.0.25.52 – 10.0.25.52	10.0.25.52
54	10.0.25.53/32	10.0.25.53 – 10.0.25.53	10.0.25.53
55	10.0.25.54/32	10.0.25.54 – 10.0.25.54	10.0.25.54
56	10.0.25.55/32	10.0.25.55 – 10.0.25.55	10.0.25.55
57	10.0.25.56/32	10.0.25.56 – 10.0.25.56	10.0.25.56
58	10.0.25.57/32	10.0.25.57 – 10.0.25.57	10.0.25.57
59	10.0.25.58/32	10.0.25.58 – 10.0.25.58	10.0.25.58
60	10.0.25.59/32	10.0.25.59 – 10.0.25.59	10.0.25.59
61	10.0.25.60/32	10.0.25.60 – 10.0.25.60	10.0.25.60
62	10.0.25.61/32	10.0.25.61 – 10.0.25.61	10.0.25.61
63	10.0.25.62/32	10.0.25.62 – 10.0.25.62	10.0.25.62
64	10.0.25.63/32	10.0.25.63 – 10.0.25.63	10.0.25.63
65	10.0.25.64/32	10.0.25.64 – 10.0.25.64	10.0.25.64
66	10.0.25.65/32	10.0.25.65 – 10.0.25.65	10.0.25.65
67	10.0.25.66/32	10.0.25.66 – 10.0.25.66	10.0.25.66
68	10.0.25.67/32	10.0.25.67 – 10.0.25.67	10.0.25.67
69	10.0.25.68/32	10.0.25.68 – 10.0.25.68	10.0.25.68
70	10.0.25.69/32	10.0.25.69 – 10.0.25.69	10.0.25.69
71	10.0.25.70/32	10.0.25.70 – 10.0.25.70	10.0.25.70
72	10.0.25.71/32	10.0.25.71 – 10.0.25.71	10.0.25.71
73	10.0.25.72/32	10.0.25.72 – 10.0.25.72	10.0.25.72
74	10.0.25.73/32	10.0.25.73 – 10.0.25.73	10.0.25.73
75	10.0.25.74/32	10.0.25.74 – 10.0.25.74	10.0.25.74
76	10.0.25.75/32	10.0.25.75 – 10.0.25.75	10.0.25.75
77	10.0.25.76/32	10.0.25.76 – 10.0.25.76	10.0.25.76
78	10.0.25.77/32	10.0.25.77 – 10.0.25.77	10.0.25.77
79	10.0.25.78/32	10.0.25.78 – 10.0.25.78	10.0.25.78
80	10.0.25.79/32	10.0.25.79 – 10.0.25.79	10.0.25.79
81	10.0.25.80/32	10.0.25.80 – 10.0.25.80	10.0.25.80
82	10.0.25.81/32	10.0.25.81 – 10.0.25.81	10.0.25.81
83	10.0.25.82/32	10.0.25.82 – 10.0.25.82	10.0.25.82
84	10.0.25.83/32	10.0.25.83 – 10.0.25.83	10.0.25.83
85	10.0.25.84/32	10.0.25.84 – 10.0.25.84	10.0.25.84
86	10.0.25.85/32	10.0.25.85 – 10.0.25.85	10.0.25.85
87	10.0.25.86/32	10.0.25.86 – 10.0.25.86	10.0.25.86
88	10.0.25.87/32	10.0.25.87 – 10.0.25.87	10.0.25.87
89	10.0.25.88/32	10.0.25.88 – 10.0.25.88	10.0.25.88
90	10.0.25.89/32	10.0.25.89 – 10.0.25.89	10.0.25.89
91	10.0.25.90/32	10.0.25.90 – 10.0.25.90	10.0.25.90
92	10.0.25.91/32	10.0.25.91 – 10.0.25.91	10.0.25.91
93	10.0.25.92/32	10.0.25.92 – 10.0.25.92	10.0.25.92
94	10.0.25.93/32	10.0.25.93 – 10.0.25.93	10.0.25.93
95	10.0.25.94/32	10.0.25.94 – 10.0.25.94	10.0.25.94
96	10.0.25.95/32	10.0.25.95 – 10.0.25.95	10.0.25.95
97	10.0.25.96/32	10.0.25.96 – 10.0.25.96	10.0.25.96
98	10.0.25.97/32	10.0.25.97 – 10.0.25.97	10.0.25.97
99	10.0.25.98/32	10.0.25.98 – 10.0.25.98	10.0.25.98
100	10.0.25.99/32	10.0.25.99 – 10.0.25.99	10.0.25.99
101	10.0.25.100/32	10.0.25.100 – 10.0.25.100	10.0.25.100
102	10.0.25.101/32	10.0.25.101 – 10.0.25.101	10.0.25.101
103	10.0.25.102/32	10.0.25.102 – 10.0.25.102	10.0.25.102
104	10.0.25.103/32	10.0.25.103 – 10.0.25.103	10.0.25.103
105	10.0.25.104/32	10.0.25.104 – 10.0.25.104	10.0.25.104
106	10.0.25.105/32	10.0.25.105 – 10.0.25.105	10.0.25.105
107	10.0.25.106/32	10.0.25.106 – 10.0.25.106	10.0.25.106
108	10.0.25.107/32	10.0.25.107 – 10.0.25.107	10.0.25.107
109	10.0.25.108/32	10.0.25.108 – 10.0.25.108	10.0.25.108
110	10.0.25.109/32	10.0.25.109 – 10.0.25.109	10.0.25.109
111	10.0.25.110/32	10.0.25.110 – 10.0.25.110	10.0.25.110
112	10.0.25.111/32	10.0.25.111 – 10.0.25.111	10.0.25.111
113	10.0.25.112/32	10.0.25.112 – 10.0.25.112	10.0.25.112
114	10.0.25.113/32	10.0.25.113 – 10.0.25.113	10.0.25.113
115	10.0.25.114/32	10.0.25.114 – 10.0.25.114	10.0.25.114
116	10.0.25.115/32	10.0.25.115 – 10.0.25.115	10.0.25.115
117	10.0.25.116/32	10.0.25.116 – 10.0.25.116	10.0.25.116
118	10.0.25.117/32	10.0.25.117 – 10.0.25.117	10.0.25.117
119	10.0.25.118/32	10.0.25.118 – 10.0.25.118	10.0.25.118
120	10.0.25.119/32	10.0.25.119 – 10.0.25.119	10.0.25.119
121	10.0.25.120/32	10.0.25.120 – 10.0.25.120	10.0.25.120
122	10.0.25.121/32	10.0.25.121 – 10.0.25.121	10.0.25.121
123	10.0.25.122/32	10.0.25.122 – 10.0.25.122	10.0.25.122
124	10.0.25.123/32	10.0.25.123 – 10.0.25.123	10.0.25.123
125	10.0.25.124/32	10.0.25.124 – 10.0.25.124	10.0.25.124
126	10.0.25.125/32	10.0.25.125 – 10.0.25.125	10.0.25.125
127	10.0.25.126/32	10.0.25.126 – 10.0.25.126	10.0.25.126
128	10.0.25.127/32	10.0.25.127 – 10.0.25.127	10.0.25.127
129	10.0.25.128/32	10.0.25.128 – 10.0.25.128	10.0.25.128
130	10.0.25.129/32	10.0.25.129 – 10.0.25.129	10.0.25.129
131	10.0.25.130/32	10.0.25.130 – 10.0.25.130	10.0.25.130
132	10.0.25.131/32	10.0.25.131 – 10.0.25.131	10.0.25.131
133	10.0.25.132/32	10.0.25.132 – 10.0.25.132	10.0.25.132
134	10.0.25.133/32	10.0.25.133 – 10.0.25.133	10.0.25.133
135	10.0.25.134/32	10.0.25.134 – 10.0.25.134	10.0.25.134
136	10.0.25.135/32	10.0.25.135 – 10.0.25.135	10.0.25.135
137	10.0.25.136/32	10.0.25.136 – 10.0.25.136	10.0.25.136
138	10.0.25.137/32	10.0.25.137 – 10.0.25.137	10.0.25.137
139	10.0.25.138/32	10.0.25.138 – 10.0.25.138	10.0.25.138
140	10.0.25.139/32	10.0.25.139 – 10.0.25.139	10.0.25.139
141	10.0.25.140/32	10.0.25.140 – 10.0.25.140	10.0.25.140
142	10.0.25.141/32	10.0.25.141 – 10.0.25.141	10.0.25.141
143	10.0.25.142/32	10.0.25.142 – 10.0.25.142	10.0.25.142
144	10.0.25.143/32	10.0.25.143 – 10.0.25.143	10.0.25.143
145	10.0.25.144/32	10.0.25.144 – 10.0.25.144	10.0.25.144
146	10.0.25.145/32	10.0.25.145 – 10.0.25.145	10.0.25.145
147	10.0.25.146/32	10.0.25.146 – 10.0.25.146	10.0.25.146
148	10.0.25.147/32	10.0.25.147 – 10.0.25.147	10.0.25.147
149	10.0.25.148/32	10.0.25.148 – 10.0.25.148	10.0.25.148
150	10.0.25.149/32	10.0.25.149 – 10.0.25.149	10.0.25.149
151	10.0.25.150/32	10.0.25.150 – 10.0.25.150	10.0.25.150
152	10.0.25.151/32	10.0.25.151 – 10.0.25.151	10.0.25.151
153	10.0.25.152/32	10.0.25.152 – 10.0.25.152	10.0.25.152
154	10.0.25.153/32	10.0.25.153 – 10.0.25.153	10.0.25.153
155	10.0.25.154/32	10.0.25.154 – 10.0.25.154	10.0.25.154
156	10.0.25.155/32	10.0.25.155 – 10.0.25.155	10.0.25.155
157	10.0.25.156/32	10.0.25.156 – 10.0.25.156	10.0.25.156
158	10.0.25.157/32	10.0.25.157 – 10.0.25.157	10.0.25.157
159	10.0.25.158/32	10.0.25.158 – 10.0.25.158	10.0.25.158
160	10.0.25.159/32	10.0.25.159 – 10.0.25.159	10.0.25.159
161	10.0.25.160/32	10.0.25.160 – 10.0.25.160	10.0.25.160
162	10.0.25.161/32	10.0.25.161 – 10.0.25.161	10.0.25.161
163	10.0.25.162/32	10.0.25.162 – 10.0.25.162	10.0.25.162
164	10.0.25.163/32	10.0.25.163 – 10.0.25.163	10.0.25.163
165	10.0.25.164/32	10.0.25.164 – 10.0.25.164	10.0.25.164
166	10.0.25.165/32	10.0.25.165 – 10.0.25.165	10.0.25.165
167	10.0.25.166/32	10.0.25.166 – 10.0.25.166	10.0.25.166
168	10.0.25.167/32	10.0.25.167 – 10.0.25.167	10.0.25.167
169	10.0.25.168/32	10.0.25.168 – 10.0.25.168	10.0.25.168
170	10.0.25.169/32	10.0.25.169 – 10.0.25.169	10.0.25.169
171	10.0.25.170/32	10.0.25.170 – 10.0.25.170	10.0.25.170
172	10.0.25.171/32	10.0.25.171 – 10.0.25.171	10.0.25.171
173	10.0.25.172/32	10.0.25.172 – 10.0.25.172	10.0.25.172
174	10.0.25.173/32	10.0.25.173 – 10.0.25.173	10.0.25.173
175	10.0.25.174/32	10.0.25.174 – 10.0.25.174	10.0.25.174
176	10.0.25.175/32	10.0.25.175 – 10.0.25.175	10.0.25.175
177	10.0.25.176/32	10.0.25.176 – 10.0.25.176	10.0.25.176
178	10.0.25.177/32	10.0.25.177 – 10.0.25.177	10.0.25.177
179	10.0.25.178/32	10.0.25.178 – 10.0.25.178	10.0.25.178
180	10.0.25.179/32	10.0.25.179 – 10.0.25.179	10.0.25.179
181	10.0.25.180/32	10.0.25.180 – 10.0.25.180	10.0.25.180
182	10.0.25.181/32	10.0.25.181 – 10.0.25.181	10.0.25.181
183	10.0.25.182/32	10.0.25.182 – 10.0.25.182	10.0.25.182
184	10.0.25.183/32	10.0.25.183 – 10.0.25.183	10.0.25.183
185	10.0.25.184/32	10.0.25.184 – 10.0.25.184	10.0.25.184
186	10.0.25.185/32	10.0.25.185 – 10.0.25.185	10.0.25.185
187	10.0.25.186/32	10.0.25.186 – 10.0.25.186	10.0.25.186
188	10.0.25.187/32	10.0.25.187 – 10.0.25.187	10.0.25.187
189	10.0.25.188/32	10.0.25.188 – 10.0.25.188	10.0.25.188
190	10.0.25.189/32	10.0.25.189 – 10.0.25.189	10.0.25.189
191	10.0.25.190/32	10.0.25.190 – 10.0.25.190	10.0.25.190
192	10.0.25.191/32	10.0.25.191 – 10.0.25.191	10.0.25.191
193	10.0.25.192/32	10.0.25.192 – 10.0.25.192	10.0.25.192
194	10.0.25.193/32	10.0.25.193 – 10.0.25.193	10.0.25.193
195	10.0.25.194/32	10.0.25.194 – 10.0.25.194	10.0.25.194
196	10.0.25.195/32	10.0.25.195 – 10.0.25.195	10.0.25.195
197	10.0.25.196/32	10.0.25.196 – 10.0.25.196	10.0.25.196
198	10.0.25.197/32	10.0.25.197 – 10.0.25.197	10.0.25.197
199	10.0.25.198/32	10.0.25.198 – 10.0.25.198	10.0.25.198
200	10.0.25.199/32	10.0.25.199 – 10.0.25.199	10.0.25.199
201	10.0.25.200/32	10.0.25.200 – 10.0.25.200	10.0.25.200
202	10.0.25.201/32	10.0.25.201 – 10.0.25.201	10.0.25.201
203	10.0.25.202/32	10.0.25.202 – 10.0.25.202	10.0.25.202
204	10.0.25.203/32	10.0.25.203 – 10.0.25.203	10.0.25.203
205	10.0.25.204/32	10.0.25.204 – 10.0.25.204	10.0.25.204
206	10.0.25.205/32	10.0.25.205 – 10.0.25.205	10.0.25.205
207	10.0.25.206/32	10.0.25.206 – 10.0.25.206	10.0.25.206
208	10.0.25.207/32	10.0.25.207 – 10.0.25.207	10.0.25.207
209	10.0.25.208/32	10.0.25.208 – 10.0.25.208	10.0.25.208
210	10.0.25.209/32	10.0.25.209 – 10.0.25.209	10.0.25.209
211	10.0.25.210/32	10.0.25.210 – 10.0.25.210	10.0.25.210
212	10.0.25.211/32	10.0.25.211 – 10.0.25.211	10.0.25.211
213	10.0.25.212/32	10.0.25.212 – 10.0.25.212	10.0.25.212
214	10.0.25.213/32	10.0.25.213 – 10.0.25.213	10.0.25.213
215	10.0.25.214/32	10.0.25.214 – 10.0.25.214	10.0.25.214
216	10.0.25.215/32	10.0.25.215 – 10.0.25.215	10.0.25.215
217	10.0.25.216/32	10.0.25.216 – 10.0.25.216	10.0.25.216
218	10.0.25.217/32	10.0.25.217 – 10.0.25.217	10.0.25.217
219	10.0.25.218/32	10.0.25.218 – 10.0.25.218	10.0.25.218
220	10.0.25.219/32	10.0.25.219 – 10.0.25.219	10.0.25.219
221	10.0.25.220/32	10.0.25.220 – 10.0.25.220	10.0.25.220
222	10.0.25.221/32	10.0.25.221 – 10.0.25.221	10.0.25.221
223	10.0.25.222/32	10.0.25.222 – 10.0.25.222	10.0.25.222
224	10.0.25.223/32	10.0.25.223 – 10.0.25.223	10.0.25.223
225	10.0.25.224/32	10.0.25.224 – 10.0.25.224	10.0.25.224
226	10.0.25.225/32	10.0.25.225 – 10.0.25.225	10.0.25.225
227	10.0.25.226/32	10.0.25.226 – 10.0.25.226	10.0.25.226
228	10.0.25.227/32	10.0.25.227 – 10.0.25.227	10.0.25.227
229	10.0.25.228/32	10.0.25.228 – 10.0.25.228	10.0.25.228
230	10.0.25.229/32	10.0.25.229 – 10.0.25.229	10.0.25.229
231	10.0.25.230/32	10.0.25.230 – 10.0.25.230	10.0.25.230
232	10.0.25.231/32	10.0.25.231 – 10.0.25.231	10.0.25.231
233	10.0.25.232/32	10.0.25.232 – 10.0.25.232	10.0.25.232
234	10.0.25.233/32	10.0.25.233 – 10.0.25.233	10.0.25.233
235	10.0.25.234/32	10.0.25.234 – 10.0.25.234	10.0.25.234
236	10.0.25.235/32	10.0.25.235 – 10.0.25.235	10.0.25.235
237	10.0.25.236/32	10.0.25.236 – 10.0.25.236	10.0.25.236
238	10.0.25.237/32	10.0.25.237 – 10.0.25.237	10.0.25.237
239	10.0.25.238/32	10.0.25.238 – 10.0.25.238	10.0.25.238
240	10.0.25.239/32	10.0.25.239 – 10.0.25.239	10.0.25.239
241	10.0.25.240/32	10.0.25.240 – 10.0.25.240	10.0.25.240
242	10.0.25.241/32	10.0.25.241 – 10.0.25.241	10.0.25.241
243	10.0.25.242/32	10.0.25.242 – 10.0.25.242	10.0.25.242
244	10.0.25.243/32	10.0.25.243 – 10.0.25.243	10.0.25.243
245	10.0.25.244/32	10.0.25.244 – 10.0.25.244	10.0.25.244
246	10.0.25.245/32	10.0.25.245 – 10.0.25.245	10.0.25.245
247	10.0.25.246/32	10.0.25.246 – 10.0.25.246	10.0.25.246
248	10.0.25.247/32	10.0.25.247 – 10.0.25.247	10.0.25.247
249	10.0.25.248/32	10.0.25.248 – 10.0.25.248	10.0.25.248
250	10.0.25.249/32	10.0.25.249 – 10.0.25.249	10.0.25.249
251	10.0.25.250/32	10.0.25.250 – 10.0.25.250	10.0.25.250
252	10.0.25.251/32	10.0.25.251 – 10.0.25.251	10.0.25.251
253	10.0.25.252/32	10.0.25.252 – 10.0.25.252	10.0.25.252
254	10.0.25.253/32	10.0.25.253 – 10.0.25.253	10.0.25.253
255	10.0.25.254/32	10.0.25.254 – 10.0.25.254	10.0.25.254
256	10.0.25.255/32	10.0.25.255 – 10.0.25.255	10.0.25.255

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 →