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)10.3.181.0/24

network10.3.181.0/24

broadcast10.3.181.255

first host10.3.181.1

last host10.3.181.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.3.181.0/24

address00001010.00000011.10110101.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.00000011.10110101.00000000

broadcast00001010.00000011.10110101.11111111

green = network part, grey = host part

hex0x0a03b500

decimal168015104

reverse dns0.181.3.10.in-addr.arpa

ipv4-mapped::ffff:a03:b500

/24 split into /32 · 256 subnets

close ×

#	network	host range	broadcast
1	10.3.181.0/32	10.3.181.0 – 10.3.181.0	10.3.181.0
2	10.3.181.1/32	10.3.181.1 – 10.3.181.1	10.3.181.1
3	10.3.181.2/32	10.3.181.2 – 10.3.181.2	10.3.181.2
4	10.3.181.3/32	10.3.181.3 – 10.3.181.3	10.3.181.3
5	10.3.181.4/32	10.3.181.4 – 10.3.181.4	10.3.181.4
6	10.3.181.5/32	10.3.181.5 – 10.3.181.5	10.3.181.5
7	10.3.181.6/32	10.3.181.6 – 10.3.181.6	10.3.181.6
8	10.3.181.7/32	10.3.181.7 – 10.3.181.7	10.3.181.7
9	10.3.181.8/32	10.3.181.8 – 10.3.181.8	10.3.181.8
10	10.3.181.9/32	10.3.181.9 – 10.3.181.9	10.3.181.9
11	10.3.181.10/32	10.3.181.10 – 10.3.181.10	10.3.181.10
12	10.3.181.11/32	10.3.181.11 – 10.3.181.11	10.3.181.11
13	10.3.181.12/32	10.3.181.12 – 10.3.181.12	10.3.181.12
14	10.3.181.13/32	10.3.181.13 – 10.3.181.13	10.3.181.13
15	10.3.181.14/32	10.3.181.14 – 10.3.181.14	10.3.181.14
16	10.3.181.15/32	10.3.181.15 – 10.3.181.15	10.3.181.15
17	10.3.181.16/32	10.3.181.16 – 10.3.181.16	10.3.181.16
18	10.3.181.17/32	10.3.181.17 – 10.3.181.17	10.3.181.17
19	10.3.181.18/32	10.3.181.18 – 10.3.181.18	10.3.181.18
20	10.3.181.19/32	10.3.181.19 – 10.3.181.19	10.3.181.19
21	10.3.181.20/32	10.3.181.20 – 10.3.181.20	10.3.181.20
22	10.3.181.21/32	10.3.181.21 – 10.3.181.21	10.3.181.21
23	10.3.181.22/32	10.3.181.22 – 10.3.181.22	10.3.181.22
24	10.3.181.23/32	10.3.181.23 – 10.3.181.23	10.3.181.23
25	10.3.181.24/32	10.3.181.24 – 10.3.181.24	10.3.181.24
26	10.3.181.25/32	10.3.181.25 – 10.3.181.25	10.3.181.25
27	10.3.181.26/32	10.3.181.26 – 10.3.181.26	10.3.181.26
28	10.3.181.27/32	10.3.181.27 – 10.3.181.27	10.3.181.27
29	10.3.181.28/32	10.3.181.28 – 10.3.181.28	10.3.181.28
30	10.3.181.29/32	10.3.181.29 – 10.3.181.29	10.3.181.29
31	10.3.181.30/32	10.3.181.30 – 10.3.181.30	10.3.181.30
32	10.3.181.31/32	10.3.181.31 – 10.3.181.31	10.3.181.31
33	10.3.181.32/32	10.3.181.32 – 10.3.181.32	10.3.181.32
34	10.3.181.33/32	10.3.181.33 – 10.3.181.33	10.3.181.33
35	10.3.181.34/32	10.3.181.34 – 10.3.181.34	10.3.181.34
36	10.3.181.35/32	10.3.181.35 – 10.3.181.35	10.3.181.35
37	10.3.181.36/32	10.3.181.36 – 10.3.181.36	10.3.181.36
38	10.3.181.37/32	10.3.181.37 – 10.3.181.37	10.3.181.37
39	10.3.181.38/32	10.3.181.38 – 10.3.181.38	10.3.181.38
40	10.3.181.39/32	10.3.181.39 – 10.3.181.39	10.3.181.39
41	10.3.181.40/32	10.3.181.40 – 10.3.181.40	10.3.181.40
42	10.3.181.41/32	10.3.181.41 – 10.3.181.41	10.3.181.41
43	10.3.181.42/32	10.3.181.42 – 10.3.181.42	10.3.181.42
44	10.3.181.43/32	10.3.181.43 – 10.3.181.43	10.3.181.43
45	10.3.181.44/32	10.3.181.44 – 10.3.181.44	10.3.181.44
46	10.3.181.45/32	10.3.181.45 – 10.3.181.45	10.3.181.45
47	10.3.181.46/32	10.3.181.46 – 10.3.181.46	10.3.181.46
48	10.3.181.47/32	10.3.181.47 – 10.3.181.47	10.3.181.47
49	10.3.181.48/32	10.3.181.48 – 10.3.181.48	10.3.181.48
50	10.3.181.49/32	10.3.181.49 – 10.3.181.49	10.3.181.49
51	10.3.181.50/32	10.3.181.50 – 10.3.181.50	10.3.181.50
52	10.3.181.51/32	10.3.181.51 – 10.3.181.51	10.3.181.51
53	10.3.181.52/32	10.3.181.52 – 10.3.181.52	10.3.181.52
54	10.3.181.53/32	10.3.181.53 – 10.3.181.53	10.3.181.53
55	10.3.181.54/32	10.3.181.54 – 10.3.181.54	10.3.181.54
56	10.3.181.55/32	10.3.181.55 – 10.3.181.55	10.3.181.55
57	10.3.181.56/32	10.3.181.56 – 10.3.181.56	10.3.181.56
58	10.3.181.57/32	10.3.181.57 – 10.3.181.57	10.3.181.57
59	10.3.181.58/32	10.3.181.58 – 10.3.181.58	10.3.181.58
60	10.3.181.59/32	10.3.181.59 – 10.3.181.59	10.3.181.59
61	10.3.181.60/32	10.3.181.60 – 10.3.181.60	10.3.181.60
62	10.3.181.61/32	10.3.181.61 – 10.3.181.61	10.3.181.61
63	10.3.181.62/32	10.3.181.62 – 10.3.181.62	10.3.181.62
64	10.3.181.63/32	10.3.181.63 – 10.3.181.63	10.3.181.63
65	10.3.181.64/32	10.3.181.64 – 10.3.181.64	10.3.181.64
66	10.3.181.65/32	10.3.181.65 – 10.3.181.65	10.3.181.65
67	10.3.181.66/32	10.3.181.66 – 10.3.181.66	10.3.181.66
68	10.3.181.67/32	10.3.181.67 – 10.3.181.67	10.3.181.67
69	10.3.181.68/32	10.3.181.68 – 10.3.181.68	10.3.181.68
70	10.3.181.69/32	10.3.181.69 – 10.3.181.69	10.3.181.69
71	10.3.181.70/32	10.3.181.70 – 10.3.181.70	10.3.181.70
72	10.3.181.71/32	10.3.181.71 – 10.3.181.71	10.3.181.71
73	10.3.181.72/32	10.3.181.72 – 10.3.181.72	10.3.181.72
74	10.3.181.73/32	10.3.181.73 – 10.3.181.73	10.3.181.73
75	10.3.181.74/32	10.3.181.74 – 10.3.181.74	10.3.181.74
76	10.3.181.75/32	10.3.181.75 – 10.3.181.75	10.3.181.75
77	10.3.181.76/32	10.3.181.76 – 10.3.181.76	10.3.181.76
78	10.3.181.77/32	10.3.181.77 – 10.3.181.77	10.3.181.77
79	10.3.181.78/32	10.3.181.78 – 10.3.181.78	10.3.181.78
80	10.3.181.79/32	10.3.181.79 – 10.3.181.79	10.3.181.79
81	10.3.181.80/32	10.3.181.80 – 10.3.181.80	10.3.181.80
82	10.3.181.81/32	10.3.181.81 – 10.3.181.81	10.3.181.81
83	10.3.181.82/32	10.3.181.82 – 10.3.181.82	10.3.181.82
84	10.3.181.83/32	10.3.181.83 – 10.3.181.83	10.3.181.83
85	10.3.181.84/32	10.3.181.84 – 10.3.181.84	10.3.181.84
86	10.3.181.85/32	10.3.181.85 – 10.3.181.85	10.3.181.85
87	10.3.181.86/32	10.3.181.86 – 10.3.181.86	10.3.181.86
88	10.3.181.87/32	10.3.181.87 – 10.3.181.87	10.3.181.87
89	10.3.181.88/32	10.3.181.88 – 10.3.181.88	10.3.181.88
90	10.3.181.89/32	10.3.181.89 – 10.3.181.89	10.3.181.89
91	10.3.181.90/32	10.3.181.90 – 10.3.181.90	10.3.181.90
92	10.3.181.91/32	10.3.181.91 – 10.3.181.91	10.3.181.91
93	10.3.181.92/32	10.3.181.92 – 10.3.181.92	10.3.181.92
94	10.3.181.93/32	10.3.181.93 – 10.3.181.93	10.3.181.93
95	10.3.181.94/32	10.3.181.94 – 10.3.181.94	10.3.181.94
96	10.3.181.95/32	10.3.181.95 – 10.3.181.95	10.3.181.95
97	10.3.181.96/32	10.3.181.96 – 10.3.181.96	10.3.181.96
98	10.3.181.97/32	10.3.181.97 – 10.3.181.97	10.3.181.97
99	10.3.181.98/32	10.3.181.98 – 10.3.181.98	10.3.181.98
100	10.3.181.99/32	10.3.181.99 – 10.3.181.99	10.3.181.99
101	10.3.181.100/32	10.3.181.100 – 10.3.181.100	10.3.181.100
102	10.3.181.101/32	10.3.181.101 – 10.3.181.101	10.3.181.101
103	10.3.181.102/32	10.3.181.102 – 10.3.181.102	10.3.181.102
104	10.3.181.103/32	10.3.181.103 – 10.3.181.103	10.3.181.103
105	10.3.181.104/32	10.3.181.104 – 10.3.181.104	10.3.181.104
106	10.3.181.105/32	10.3.181.105 – 10.3.181.105	10.3.181.105
107	10.3.181.106/32	10.3.181.106 – 10.3.181.106	10.3.181.106
108	10.3.181.107/32	10.3.181.107 – 10.3.181.107	10.3.181.107
109	10.3.181.108/32	10.3.181.108 – 10.3.181.108	10.3.181.108
110	10.3.181.109/32	10.3.181.109 – 10.3.181.109	10.3.181.109
111	10.3.181.110/32	10.3.181.110 – 10.3.181.110	10.3.181.110
112	10.3.181.111/32	10.3.181.111 – 10.3.181.111	10.3.181.111
113	10.3.181.112/32	10.3.181.112 – 10.3.181.112	10.3.181.112
114	10.3.181.113/32	10.3.181.113 – 10.3.181.113	10.3.181.113
115	10.3.181.114/32	10.3.181.114 – 10.3.181.114	10.3.181.114
116	10.3.181.115/32	10.3.181.115 – 10.3.181.115	10.3.181.115
117	10.3.181.116/32	10.3.181.116 – 10.3.181.116	10.3.181.116
118	10.3.181.117/32	10.3.181.117 – 10.3.181.117	10.3.181.117
119	10.3.181.118/32	10.3.181.118 – 10.3.181.118	10.3.181.118
120	10.3.181.119/32	10.3.181.119 – 10.3.181.119	10.3.181.119
121	10.3.181.120/32	10.3.181.120 – 10.3.181.120	10.3.181.120
122	10.3.181.121/32	10.3.181.121 – 10.3.181.121	10.3.181.121
123	10.3.181.122/32	10.3.181.122 – 10.3.181.122	10.3.181.122
124	10.3.181.123/32	10.3.181.123 – 10.3.181.123	10.3.181.123
125	10.3.181.124/32	10.3.181.124 – 10.3.181.124	10.3.181.124
126	10.3.181.125/32	10.3.181.125 – 10.3.181.125	10.3.181.125
127	10.3.181.126/32	10.3.181.126 – 10.3.181.126	10.3.181.126
128	10.3.181.127/32	10.3.181.127 – 10.3.181.127	10.3.181.127
129	10.3.181.128/32	10.3.181.128 – 10.3.181.128	10.3.181.128
130	10.3.181.129/32	10.3.181.129 – 10.3.181.129	10.3.181.129
131	10.3.181.130/32	10.3.181.130 – 10.3.181.130	10.3.181.130
132	10.3.181.131/32	10.3.181.131 – 10.3.181.131	10.3.181.131
133	10.3.181.132/32	10.3.181.132 – 10.3.181.132	10.3.181.132
134	10.3.181.133/32	10.3.181.133 – 10.3.181.133	10.3.181.133
135	10.3.181.134/32	10.3.181.134 – 10.3.181.134	10.3.181.134
136	10.3.181.135/32	10.3.181.135 – 10.3.181.135	10.3.181.135
137	10.3.181.136/32	10.3.181.136 – 10.3.181.136	10.3.181.136
138	10.3.181.137/32	10.3.181.137 – 10.3.181.137	10.3.181.137
139	10.3.181.138/32	10.3.181.138 – 10.3.181.138	10.3.181.138
140	10.3.181.139/32	10.3.181.139 – 10.3.181.139	10.3.181.139
141	10.3.181.140/32	10.3.181.140 – 10.3.181.140	10.3.181.140
142	10.3.181.141/32	10.3.181.141 – 10.3.181.141	10.3.181.141
143	10.3.181.142/32	10.3.181.142 – 10.3.181.142	10.3.181.142
144	10.3.181.143/32	10.3.181.143 – 10.3.181.143	10.3.181.143
145	10.3.181.144/32	10.3.181.144 – 10.3.181.144	10.3.181.144
146	10.3.181.145/32	10.3.181.145 – 10.3.181.145	10.3.181.145
147	10.3.181.146/32	10.3.181.146 – 10.3.181.146	10.3.181.146
148	10.3.181.147/32	10.3.181.147 – 10.3.181.147	10.3.181.147
149	10.3.181.148/32	10.3.181.148 – 10.3.181.148	10.3.181.148
150	10.3.181.149/32	10.3.181.149 – 10.3.181.149	10.3.181.149
151	10.3.181.150/32	10.3.181.150 – 10.3.181.150	10.3.181.150
152	10.3.181.151/32	10.3.181.151 – 10.3.181.151	10.3.181.151
153	10.3.181.152/32	10.3.181.152 – 10.3.181.152	10.3.181.152
154	10.3.181.153/32	10.3.181.153 – 10.3.181.153	10.3.181.153
155	10.3.181.154/32	10.3.181.154 – 10.3.181.154	10.3.181.154
156	10.3.181.155/32	10.3.181.155 – 10.3.181.155	10.3.181.155
157	10.3.181.156/32	10.3.181.156 – 10.3.181.156	10.3.181.156
158	10.3.181.157/32	10.3.181.157 – 10.3.181.157	10.3.181.157
159	10.3.181.158/32	10.3.181.158 – 10.3.181.158	10.3.181.158
160	10.3.181.159/32	10.3.181.159 – 10.3.181.159	10.3.181.159
161	10.3.181.160/32	10.3.181.160 – 10.3.181.160	10.3.181.160
162	10.3.181.161/32	10.3.181.161 – 10.3.181.161	10.3.181.161
163	10.3.181.162/32	10.3.181.162 – 10.3.181.162	10.3.181.162
164	10.3.181.163/32	10.3.181.163 – 10.3.181.163	10.3.181.163
165	10.3.181.164/32	10.3.181.164 – 10.3.181.164	10.3.181.164
166	10.3.181.165/32	10.3.181.165 – 10.3.181.165	10.3.181.165
167	10.3.181.166/32	10.3.181.166 – 10.3.181.166	10.3.181.166
168	10.3.181.167/32	10.3.181.167 – 10.3.181.167	10.3.181.167
169	10.3.181.168/32	10.3.181.168 – 10.3.181.168	10.3.181.168
170	10.3.181.169/32	10.3.181.169 – 10.3.181.169	10.3.181.169
171	10.3.181.170/32	10.3.181.170 – 10.3.181.170	10.3.181.170
172	10.3.181.171/32	10.3.181.171 – 10.3.181.171	10.3.181.171
173	10.3.181.172/32	10.3.181.172 – 10.3.181.172	10.3.181.172
174	10.3.181.173/32	10.3.181.173 – 10.3.181.173	10.3.181.173
175	10.3.181.174/32	10.3.181.174 – 10.3.181.174	10.3.181.174
176	10.3.181.175/32	10.3.181.175 – 10.3.181.175	10.3.181.175
177	10.3.181.176/32	10.3.181.176 – 10.3.181.176	10.3.181.176
178	10.3.181.177/32	10.3.181.177 – 10.3.181.177	10.3.181.177
179	10.3.181.178/32	10.3.181.178 – 10.3.181.178	10.3.181.178
180	10.3.181.179/32	10.3.181.179 – 10.3.181.179	10.3.181.179
181	10.3.181.180/32	10.3.181.180 – 10.3.181.180	10.3.181.180
182	10.3.181.181/32	10.3.181.181 – 10.3.181.181	10.3.181.181
183	10.3.181.182/32	10.3.181.182 – 10.3.181.182	10.3.181.182
184	10.3.181.183/32	10.3.181.183 – 10.3.181.183	10.3.181.183
185	10.3.181.184/32	10.3.181.184 – 10.3.181.184	10.3.181.184
186	10.3.181.185/32	10.3.181.185 – 10.3.181.185	10.3.181.185
187	10.3.181.186/32	10.3.181.186 – 10.3.181.186	10.3.181.186
188	10.3.181.187/32	10.3.181.187 – 10.3.181.187	10.3.181.187
189	10.3.181.188/32	10.3.181.188 – 10.3.181.188	10.3.181.188
190	10.3.181.189/32	10.3.181.189 – 10.3.181.189	10.3.181.189
191	10.3.181.190/32	10.3.181.190 – 10.3.181.190	10.3.181.190
192	10.3.181.191/32	10.3.181.191 – 10.3.181.191	10.3.181.191
193	10.3.181.192/32	10.3.181.192 – 10.3.181.192	10.3.181.192
194	10.3.181.193/32	10.3.181.193 – 10.3.181.193	10.3.181.193
195	10.3.181.194/32	10.3.181.194 – 10.3.181.194	10.3.181.194
196	10.3.181.195/32	10.3.181.195 – 10.3.181.195	10.3.181.195
197	10.3.181.196/32	10.3.181.196 – 10.3.181.196	10.3.181.196
198	10.3.181.197/32	10.3.181.197 – 10.3.181.197	10.3.181.197
199	10.3.181.198/32	10.3.181.198 – 10.3.181.198	10.3.181.198
200	10.3.181.199/32	10.3.181.199 – 10.3.181.199	10.3.181.199
201	10.3.181.200/32	10.3.181.200 – 10.3.181.200	10.3.181.200
202	10.3.181.201/32	10.3.181.201 – 10.3.181.201	10.3.181.201
203	10.3.181.202/32	10.3.181.202 – 10.3.181.202	10.3.181.202
204	10.3.181.203/32	10.3.181.203 – 10.3.181.203	10.3.181.203
205	10.3.181.204/32	10.3.181.204 – 10.3.181.204	10.3.181.204
206	10.3.181.205/32	10.3.181.205 – 10.3.181.205	10.3.181.205
207	10.3.181.206/32	10.3.181.206 – 10.3.181.206	10.3.181.206
208	10.3.181.207/32	10.3.181.207 – 10.3.181.207	10.3.181.207
209	10.3.181.208/32	10.3.181.208 – 10.3.181.208	10.3.181.208
210	10.3.181.209/32	10.3.181.209 – 10.3.181.209	10.3.181.209
211	10.3.181.210/32	10.3.181.210 – 10.3.181.210	10.3.181.210
212	10.3.181.211/32	10.3.181.211 – 10.3.181.211	10.3.181.211
213	10.3.181.212/32	10.3.181.212 – 10.3.181.212	10.3.181.212
214	10.3.181.213/32	10.3.181.213 – 10.3.181.213	10.3.181.213
215	10.3.181.214/32	10.3.181.214 – 10.3.181.214	10.3.181.214
216	10.3.181.215/32	10.3.181.215 – 10.3.181.215	10.3.181.215
217	10.3.181.216/32	10.3.181.216 – 10.3.181.216	10.3.181.216
218	10.3.181.217/32	10.3.181.217 – 10.3.181.217	10.3.181.217
219	10.3.181.218/32	10.3.181.218 – 10.3.181.218	10.3.181.218
220	10.3.181.219/32	10.3.181.219 – 10.3.181.219	10.3.181.219
221	10.3.181.220/32	10.3.181.220 – 10.3.181.220	10.3.181.220
222	10.3.181.221/32	10.3.181.221 – 10.3.181.221	10.3.181.221
223	10.3.181.222/32	10.3.181.222 – 10.3.181.222	10.3.181.222
224	10.3.181.223/32	10.3.181.223 – 10.3.181.223	10.3.181.223
225	10.3.181.224/32	10.3.181.224 – 10.3.181.224	10.3.181.224
226	10.3.181.225/32	10.3.181.225 – 10.3.181.225	10.3.181.225
227	10.3.181.226/32	10.3.181.226 – 10.3.181.226	10.3.181.226
228	10.3.181.227/32	10.3.181.227 – 10.3.181.227	10.3.181.227
229	10.3.181.228/32	10.3.181.228 – 10.3.181.228	10.3.181.228
230	10.3.181.229/32	10.3.181.229 – 10.3.181.229	10.3.181.229
231	10.3.181.230/32	10.3.181.230 – 10.3.181.230	10.3.181.230
232	10.3.181.231/32	10.3.181.231 – 10.3.181.231	10.3.181.231
233	10.3.181.232/32	10.3.181.232 – 10.3.181.232	10.3.181.232
234	10.3.181.233/32	10.3.181.233 – 10.3.181.233	10.3.181.233
235	10.3.181.234/32	10.3.181.234 – 10.3.181.234	10.3.181.234
236	10.3.181.235/32	10.3.181.235 – 10.3.181.235	10.3.181.235
237	10.3.181.236/32	10.3.181.236 – 10.3.181.236	10.3.181.236
238	10.3.181.237/32	10.3.181.237 – 10.3.181.237	10.3.181.237
239	10.3.181.238/32	10.3.181.238 – 10.3.181.238	10.3.181.238
240	10.3.181.239/32	10.3.181.239 – 10.3.181.239	10.3.181.239
241	10.3.181.240/32	10.3.181.240 – 10.3.181.240	10.3.181.240
242	10.3.181.241/32	10.3.181.241 – 10.3.181.241	10.3.181.241
243	10.3.181.242/32	10.3.181.242 – 10.3.181.242	10.3.181.242
244	10.3.181.243/32	10.3.181.243 – 10.3.181.243	10.3.181.243
245	10.3.181.244/32	10.3.181.244 – 10.3.181.244	10.3.181.244
246	10.3.181.245/32	10.3.181.245 – 10.3.181.245	10.3.181.245
247	10.3.181.246/32	10.3.181.246 – 10.3.181.246	10.3.181.246
248	10.3.181.247/32	10.3.181.247 – 10.3.181.247	10.3.181.247
249	10.3.181.248/32	10.3.181.248 – 10.3.181.248	10.3.181.248
250	10.3.181.249/32	10.3.181.249 – 10.3.181.249	10.3.181.249
251	10.3.181.250/32	10.3.181.250 – 10.3.181.250	10.3.181.250
252	10.3.181.251/32	10.3.181.251 – 10.3.181.251	10.3.181.251
253	10.3.181.252/32	10.3.181.252 – 10.3.181.252	10.3.181.252
254	10.3.181.253/32	10.3.181.253 – 10.3.181.253	10.3.181.253
255	10.3.181.254/32	10.3.181.254 – 10.3.181.254	10.3.181.254
256	10.3.181.255/32	10.3.181.255 – 10.3.181.255	10.3.181.255

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 →