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)10.3.81.0/24

network10.3.81.0/24

broadcast10.3.81.255

first host10.3.81.1

last host10.3.81.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.3.81.0/24

address00001010.00000011.01010001.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.00000011.01010001.00000000

broadcast00001010.00000011.01010001.11111111

green = network part, grey = host part

hex0x0a035100

decimal167989504

reverse dns0.81.3.10.in-addr.arpa

ipv4-mapped::ffff:a03:5100

/24 split into /32 · 256 subnets

close ×

#	network	host range	broadcast
1	10.3.81.0/32	10.3.81.0 – 10.3.81.0	10.3.81.0
2	10.3.81.1/32	10.3.81.1 – 10.3.81.1	10.3.81.1
3	10.3.81.2/32	10.3.81.2 – 10.3.81.2	10.3.81.2
4	10.3.81.3/32	10.3.81.3 – 10.3.81.3	10.3.81.3
5	10.3.81.4/32	10.3.81.4 – 10.3.81.4	10.3.81.4
6	10.3.81.5/32	10.3.81.5 – 10.3.81.5	10.3.81.5
7	10.3.81.6/32	10.3.81.6 – 10.3.81.6	10.3.81.6
8	10.3.81.7/32	10.3.81.7 – 10.3.81.7	10.3.81.7
9	10.3.81.8/32	10.3.81.8 – 10.3.81.8	10.3.81.8
10	10.3.81.9/32	10.3.81.9 – 10.3.81.9	10.3.81.9
11	10.3.81.10/32	10.3.81.10 – 10.3.81.10	10.3.81.10
12	10.3.81.11/32	10.3.81.11 – 10.3.81.11	10.3.81.11
13	10.3.81.12/32	10.3.81.12 – 10.3.81.12	10.3.81.12
14	10.3.81.13/32	10.3.81.13 – 10.3.81.13	10.3.81.13
15	10.3.81.14/32	10.3.81.14 – 10.3.81.14	10.3.81.14
16	10.3.81.15/32	10.3.81.15 – 10.3.81.15	10.3.81.15
17	10.3.81.16/32	10.3.81.16 – 10.3.81.16	10.3.81.16
18	10.3.81.17/32	10.3.81.17 – 10.3.81.17	10.3.81.17
19	10.3.81.18/32	10.3.81.18 – 10.3.81.18	10.3.81.18
20	10.3.81.19/32	10.3.81.19 – 10.3.81.19	10.3.81.19
21	10.3.81.20/32	10.3.81.20 – 10.3.81.20	10.3.81.20
22	10.3.81.21/32	10.3.81.21 – 10.3.81.21	10.3.81.21
23	10.3.81.22/32	10.3.81.22 – 10.3.81.22	10.3.81.22
24	10.3.81.23/32	10.3.81.23 – 10.3.81.23	10.3.81.23
25	10.3.81.24/32	10.3.81.24 – 10.3.81.24	10.3.81.24
26	10.3.81.25/32	10.3.81.25 – 10.3.81.25	10.3.81.25
27	10.3.81.26/32	10.3.81.26 – 10.3.81.26	10.3.81.26
28	10.3.81.27/32	10.3.81.27 – 10.3.81.27	10.3.81.27
29	10.3.81.28/32	10.3.81.28 – 10.3.81.28	10.3.81.28
30	10.3.81.29/32	10.3.81.29 – 10.3.81.29	10.3.81.29
31	10.3.81.30/32	10.3.81.30 – 10.3.81.30	10.3.81.30
32	10.3.81.31/32	10.3.81.31 – 10.3.81.31	10.3.81.31
33	10.3.81.32/32	10.3.81.32 – 10.3.81.32	10.3.81.32
34	10.3.81.33/32	10.3.81.33 – 10.3.81.33	10.3.81.33
35	10.3.81.34/32	10.3.81.34 – 10.3.81.34	10.3.81.34
36	10.3.81.35/32	10.3.81.35 – 10.3.81.35	10.3.81.35
37	10.3.81.36/32	10.3.81.36 – 10.3.81.36	10.3.81.36
38	10.3.81.37/32	10.3.81.37 – 10.3.81.37	10.3.81.37
39	10.3.81.38/32	10.3.81.38 – 10.3.81.38	10.3.81.38
40	10.3.81.39/32	10.3.81.39 – 10.3.81.39	10.3.81.39
41	10.3.81.40/32	10.3.81.40 – 10.3.81.40	10.3.81.40
42	10.3.81.41/32	10.3.81.41 – 10.3.81.41	10.3.81.41
43	10.3.81.42/32	10.3.81.42 – 10.3.81.42	10.3.81.42
44	10.3.81.43/32	10.3.81.43 – 10.3.81.43	10.3.81.43
45	10.3.81.44/32	10.3.81.44 – 10.3.81.44	10.3.81.44
46	10.3.81.45/32	10.3.81.45 – 10.3.81.45	10.3.81.45
47	10.3.81.46/32	10.3.81.46 – 10.3.81.46	10.3.81.46
48	10.3.81.47/32	10.3.81.47 – 10.3.81.47	10.3.81.47
49	10.3.81.48/32	10.3.81.48 – 10.3.81.48	10.3.81.48
50	10.3.81.49/32	10.3.81.49 – 10.3.81.49	10.3.81.49
51	10.3.81.50/32	10.3.81.50 – 10.3.81.50	10.3.81.50
52	10.3.81.51/32	10.3.81.51 – 10.3.81.51	10.3.81.51
53	10.3.81.52/32	10.3.81.52 – 10.3.81.52	10.3.81.52
54	10.3.81.53/32	10.3.81.53 – 10.3.81.53	10.3.81.53
55	10.3.81.54/32	10.3.81.54 – 10.3.81.54	10.3.81.54
56	10.3.81.55/32	10.3.81.55 – 10.3.81.55	10.3.81.55
57	10.3.81.56/32	10.3.81.56 – 10.3.81.56	10.3.81.56
58	10.3.81.57/32	10.3.81.57 – 10.3.81.57	10.3.81.57
59	10.3.81.58/32	10.3.81.58 – 10.3.81.58	10.3.81.58
60	10.3.81.59/32	10.3.81.59 – 10.3.81.59	10.3.81.59
61	10.3.81.60/32	10.3.81.60 – 10.3.81.60	10.3.81.60
62	10.3.81.61/32	10.3.81.61 – 10.3.81.61	10.3.81.61
63	10.3.81.62/32	10.3.81.62 – 10.3.81.62	10.3.81.62
64	10.3.81.63/32	10.3.81.63 – 10.3.81.63	10.3.81.63
65	10.3.81.64/32	10.3.81.64 – 10.3.81.64	10.3.81.64
66	10.3.81.65/32	10.3.81.65 – 10.3.81.65	10.3.81.65
67	10.3.81.66/32	10.3.81.66 – 10.3.81.66	10.3.81.66
68	10.3.81.67/32	10.3.81.67 – 10.3.81.67	10.3.81.67
69	10.3.81.68/32	10.3.81.68 – 10.3.81.68	10.3.81.68
70	10.3.81.69/32	10.3.81.69 – 10.3.81.69	10.3.81.69
71	10.3.81.70/32	10.3.81.70 – 10.3.81.70	10.3.81.70
72	10.3.81.71/32	10.3.81.71 – 10.3.81.71	10.3.81.71
73	10.3.81.72/32	10.3.81.72 – 10.3.81.72	10.3.81.72
74	10.3.81.73/32	10.3.81.73 – 10.3.81.73	10.3.81.73
75	10.3.81.74/32	10.3.81.74 – 10.3.81.74	10.3.81.74
76	10.3.81.75/32	10.3.81.75 – 10.3.81.75	10.3.81.75
77	10.3.81.76/32	10.3.81.76 – 10.3.81.76	10.3.81.76
78	10.3.81.77/32	10.3.81.77 – 10.3.81.77	10.3.81.77
79	10.3.81.78/32	10.3.81.78 – 10.3.81.78	10.3.81.78
80	10.3.81.79/32	10.3.81.79 – 10.3.81.79	10.3.81.79
81	10.3.81.80/32	10.3.81.80 – 10.3.81.80	10.3.81.80
82	10.3.81.81/32	10.3.81.81 – 10.3.81.81	10.3.81.81
83	10.3.81.82/32	10.3.81.82 – 10.3.81.82	10.3.81.82
84	10.3.81.83/32	10.3.81.83 – 10.3.81.83	10.3.81.83
85	10.3.81.84/32	10.3.81.84 – 10.3.81.84	10.3.81.84
86	10.3.81.85/32	10.3.81.85 – 10.3.81.85	10.3.81.85
87	10.3.81.86/32	10.3.81.86 – 10.3.81.86	10.3.81.86
88	10.3.81.87/32	10.3.81.87 – 10.3.81.87	10.3.81.87
89	10.3.81.88/32	10.3.81.88 – 10.3.81.88	10.3.81.88
90	10.3.81.89/32	10.3.81.89 – 10.3.81.89	10.3.81.89
91	10.3.81.90/32	10.3.81.90 – 10.3.81.90	10.3.81.90
92	10.3.81.91/32	10.3.81.91 – 10.3.81.91	10.3.81.91
93	10.3.81.92/32	10.3.81.92 – 10.3.81.92	10.3.81.92
94	10.3.81.93/32	10.3.81.93 – 10.3.81.93	10.3.81.93
95	10.3.81.94/32	10.3.81.94 – 10.3.81.94	10.3.81.94
96	10.3.81.95/32	10.3.81.95 – 10.3.81.95	10.3.81.95
97	10.3.81.96/32	10.3.81.96 – 10.3.81.96	10.3.81.96
98	10.3.81.97/32	10.3.81.97 – 10.3.81.97	10.3.81.97
99	10.3.81.98/32	10.3.81.98 – 10.3.81.98	10.3.81.98
100	10.3.81.99/32	10.3.81.99 – 10.3.81.99	10.3.81.99
101	10.3.81.100/32	10.3.81.100 – 10.3.81.100	10.3.81.100
102	10.3.81.101/32	10.3.81.101 – 10.3.81.101	10.3.81.101
103	10.3.81.102/32	10.3.81.102 – 10.3.81.102	10.3.81.102
104	10.3.81.103/32	10.3.81.103 – 10.3.81.103	10.3.81.103
105	10.3.81.104/32	10.3.81.104 – 10.3.81.104	10.3.81.104
106	10.3.81.105/32	10.3.81.105 – 10.3.81.105	10.3.81.105
107	10.3.81.106/32	10.3.81.106 – 10.3.81.106	10.3.81.106
108	10.3.81.107/32	10.3.81.107 – 10.3.81.107	10.3.81.107
109	10.3.81.108/32	10.3.81.108 – 10.3.81.108	10.3.81.108
110	10.3.81.109/32	10.3.81.109 – 10.3.81.109	10.3.81.109
111	10.3.81.110/32	10.3.81.110 – 10.3.81.110	10.3.81.110
112	10.3.81.111/32	10.3.81.111 – 10.3.81.111	10.3.81.111
113	10.3.81.112/32	10.3.81.112 – 10.3.81.112	10.3.81.112
114	10.3.81.113/32	10.3.81.113 – 10.3.81.113	10.3.81.113
115	10.3.81.114/32	10.3.81.114 – 10.3.81.114	10.3.81.114
116	10.3.81.115/32	10.3.81.115 – 10.3.81.115	10.3.81.115
117	10.3.81.116/32	10.3.81.116 – 10.3.81.116	10.3.81.116
118	10.3.81.117/32	10.3.81.117 – 10.3.81.117	10.3.81.117
119	10.3.81.118/32	10.3.81.118 – 10.3.81.118	10.3.81.118
120	10.3.81.119/32	10.3.81.119 – 10.3.81.119	10.3.81.119
121	10.3.81.120/32	10.3.81.120 – 10.3.81.120	10.3.81.120
122	10.3.81.121/32	10.3.81.121 – 10.3.81.121	10.3.81.121
123	10.3.81.122/32	10.3.81.122 – 10.3.81.122	10.3.81.122
124	10.3.81.123/32	10.3.81.123 – 10.3.81.123	10.3.81.123
125	10.3.81.124/32	10.3.81.124 – 10.3.81.124	10.3.81.124
126	10.3.81.125/32	10.3.81.125 – 10.3.81.125	10.3.81.125
127	10.3.81.126/32	10.3.81.126 – 10.3.81.126	10.3.81.126
128	10.3.81.127/32	10.3.81.127 – 10.3.81.127	10.3.81.127
129	10.3.81.128/32	10.3.81.128 – 10.3.81.128	10.3.81.128
130	10.3.81.129/32	10.3.81.129 – 10.3.81.129	10.3.81.129
131	10.3.81.130/32	10.3.81.130 – 10.3.81.130	10.3.81.130
132	10.3.81.131/32	10.3.81.131 – 10.3.81.131	10.3.81.131
133	10.3.81.132/32	10.3.81.132 – 10.3.81.132	10.3.81.132
134	10.3.81.133/32	10.3.81.133 – 10.3.81.133	10.3.81.133
135	10.3.81.134/32	10.3.81.134 – 10.3.81.134	10.3.81.134
136	10.3.81.135/32	10.3.81.135 – 10.3.81.135	10.3.81.135
137	10.3.81.136/32	10.3.81.136 – 10.3.81.136	10.3.81.136
138	10.3.81.137/32	10.3.81.137 – 10.3.81.137	10.3.81.137
139	10.3.81.138/32	10.3.81.138 – 10.3.81.138	10.3.81.138
140	10.3.81.139/32	10.3.81.139 – 10.3.81.139	10.3.81.139
141	10.3.81.140/32	10.3.81.140 – 10.3.81.140	10.3.81.140
142	10.3.81.141/32	10.3.81.141 – 10.3.81.141	10.3.81.141
143	10.3.81.142/32	10.3.81.142 – 10.3.81.142	10.3.81.142
144	10.3.81.143/32	10.3.81.143 – 10.3.81.143	10.3.81.143
145	10.3.81.144/32	10.3.81.144 – 10.3.81.144	10.3.81.144
146	10.3.81.145/32	10.3.81.145 – 10.3.81.145	10.3.81.145
147	10.3.81.146/32	10.3.81.146 – 10.3.81.146	10.3.81.146
148	10.3.81.147/32	10.3.81.147 – 10.3.81.147	10.3.81.147
149	10.3.81.148/32	10.3.81.148 – 10.3.81.148	10.3.81.148
150	10.3.81.149/32	10.3.81.149 – 10.3.81.149	10.3.81.149
151	10.3.81.150/32	10.3.81.150 – 10.3.81.150	10.3.81.150
152	10.3.81.151/32	10.3.81.151 – 10.3.81.151	10.3.81.151
153	10.3.81.152/32	10.3.81.152 – 10.3.81.152	10.3.81.152
154	10.3.81.153/32	10.3.81.153 – 10.3.81.153	10.3.81.153
155	10.3.81.154/32	10.3.81.154 – 10.3.81.154	10.3.81.154
156	10.3.81.155/32	10.3.81.155 – 10.3.81.155	10.3.81.155
157	10.3.81.156/32	10.3.81.156 – 10.3.81.156	10.3.81.156
158	10.3.81.157/32	10.3.81.157 – 10.3.81.157	10.3.81.157
159	10.3.81.158/32	10.3.81.158 – 10.3.81.158	10.3.81.158
160	10.3.81.159/32	10.3.81.159 – 10.3.81.159	10.3.81.159
161	10.3.81.160/32	10.3.81.160 – 10.3.81.160	10.3.81.160
162	10.3.81.161/32	10.3.81.161 – 10.3.81.161	10.3.81.161
163	10.3.81.162/32	10.3.81.162 – 10.3.81.162	10.3.81.162
164	10.3.81.163/32	10.3.81.163 – 10.3.81.163	10.3.81.163
165	10.3.81.164/32	10.3.81.164 – 10.3.81.164	10.3.81.164
166	10.3.81.165/32	10.3.81.165 – 10.3.81.165	10.3.81.165
167	10.3.81.166/32	10.3.81.166 – 10.3.81.166	10.3.81.166
168	10.3.81.167/32	10.3.81.167 – 10.3.81.167	10.3.81.167
169	10.3.81.168/32	10.3.81.168 – 10.3.81.168	10.3.81.168
170	10.3.81.169/32	10.3.81.169 – 10.3.81.169	10.3.81.169
171	10.3.81.170/32	10.3.81.170 – 10.3.81.170	10.3.81.170
172	10.3.81.171/32	10.3.81.171 – 10.3.81.171	10.3.81.171
173	10.3.81.172/32	10.3.81.172 – 10.3.81.172	10.3.81.172
174	10.3.81.173/32	10.3.81.173 – 10.3.81.173	10.3.81.173
175	10.3.81.174/32	10.3.81.174 – 10.3.81.174	10.3.81.174
176	10.3.81.175/32	10.3.81.175 – 10.3.81.175	10.3.81.175
177	10.3.81.176/32	10.3.81.176 – 10.3.81.176	10.3.81.176
178	10.3.81.177/32	10.3.81.177 – 10.3.81.177	10.3.81.177
179	10.3.81.178/32	10.3.81.178 – 10.3.81.178	10.3.81.178
180	10.3.81.179/32	10.3.81.179 – 10.3.81.179	10.3.81.179
181	10.3.81.180/32	10.3.81.180 – 10.3.81.180	10.3.81.180
182	10.3.81.181/32	10.3.81.181 – 10.3.81.181	10.3.81.181
183	10.3.81.182/32	10.3.81.182 – 10.3.81.182	10.3.81.182
184	10.3.81.183/32	10.3.81.183 – 10.3.81.183	10.3.81.183
185	10.3.81.184/32	10.3.81.184 – 10.3.81.184	10.3.81.184
186	10.3.81.185/32	10.3.81.185 – 10.3.81.185	10.3.81.185
187	10.3.81.186/32	10.3.81.186 – 10.3.81.186	10.3.81.186
188	10.3.81.187/32	10.3.81.187 – 10.3.81.187	10.3.81.187
189	10.3.81.188/32	10.3.81.188 – 10.3.81.188	10.3.81.188
190	10.3.81.189/32	10.3.81.189 – 10.3.81.189	10.3.81.189
191	10.3.81.190/32	10.3.81.190 – 10.3.81.190	10.3.81.190
192	10.3.81.191/32	10.3.81.191 – 10.3.81.191	10.3.81.191
193	10.3.81.192/32	10.3.81.192 – 10.3.81.192	10.3.81.192
194	10.3.81.193/32	10.3.81.193 – 10.3.81.193	10.3.81.193
195	10.3.81.194/32	10.3.81.194 – 10.3.81.194	10.3.81.194
196	10.3.81.195/32	10.3.81.195 – 10.3.81.195	10.3.81.195
197	10.3.81.196/32	10.3.81.196 – 10.3.81.196	10.3.81.196
198	10.3.81.197/32	10.3.81.197 – 10.3.81.197	10.3.81.197
199	10.3.81.198/32	10.3.81.198 – 10.3.81.198	10.3.81.198
200	10.3.81.199/32	10.3.81.199 – 10.3.81.199	10.3.81.199
201	10.3.81.200/32	10.3.81.200 – 10.3.81.200	10.3.81.200
202	10.3.81.201/32	10.3.81.201 – 10.3.81.201	10.3.81.201
203	10.3.81.202/32	10.3.81.202 – 10.3.81.202	10.3.81.202
204	10.3.81.203/32	10.3.81.203 – 10.3.81.203	10.3.81.203
205	10.3.81.204/32	10.3.81.204 – 10.3.81.204	10.3.81.204
206	10.3.81.205/32	10.3.81.205 – 10.3.81.205	10.3.81.205
207	10.3.81.206/32	10.3.81.206 – 10.3.81.206	10.3.81.206
208	10.3.81.207/32	10.3.81.207 – 10.3.81.207	10.3.81.207
209	10.3.81.208/32	10.3.81.208 – 10.3.81.208	10.3.81.208
210	10.3.81.209/32	10.3.81.209 – 10.3.81.209	10.3.81.209
211	10.3.81.210/32	10.3.81.210 – 10.3.81.210	10.3.81.210
212	10.3.81.211/32	10.3.81.211 – 10.3.81.211	10.3.81.211
213	10.3.81.212/32	10.3.81.212 – 10.3.81.212	10.3.81.212
214	10.3.81.213/32	10.3.81.213 – 10.3.81.213	10.3.81.213
215	10.3.81.214/32	10.3.81.214 – 10.3.81.214	10.3.81.214
216	10.3.81.215/32	10.3.81.215 – 10.3.81.215	10.3.81.215
217	10.3.81.216/32	10.3.81.216 – 10.3.81.216	10.3.81.216
218	10.3.81.217/32	10.3.81.217 – 10.3.81.217	10.3.81.217
219	10.3.81.218/32	10.3.81.218 – 10.3.81.218	10.3.81.218
220	10.3.81.219/32	10.3.81.219 – 10.3.81.219	10.3.81.219
221	10.3.81.220/32	10.3.81.220 – 10.3.81.220	10.3.81.220
222	10.3.81.221/32	10.3.81.221 – 10.3.81.221	10.3.81.221
223	10.3.81.222/32	10.3.81.222 – 10.3.81.222	10.3.81.222
224	10.3.81.223/32	10.3.81.223 – 10.3.81.223	10.3.81.223
225	10.3.81.224/32	10.3.81.224 – 10.3.81.224	10.3.81.224
226	10.3.81.225/32	10.3.81.225 – 10.3.81.225	10.3.81.225
227	10.3.81.226/32	10.3.81.226 – 10.3.81.226	10.3.81.226
228	10.3.81.227/32	10.3.81.227 – 10.3.81.227	10.3.81.227
229	10.3.81.228/32	10.3.81.228 – 10.3.81.228	10.3.81.228
230	10.3.81.229/32	10.3.81.229 – 10.3.81.229	10.3.81.229
231	10.3.81.230/32	10.3.81.230 – 10.3.81.230	10.3.81.230
232	10.3.81.231/32	10.3.81.231 – 10.3.81.231	10.3.81.231
233	10.3.81.232/32	10.3.81.232 – 10.3.81.232	10.3.81.232
234	10.3.81.233/32	10.3.81.233 – 10.3.81.233	10.3.81.233
235	10.3.81.234/32	10.3.81.234 – 10.3.81.234	10.3.81.234
236	10.3.81.235/32	10.3.81.235 – 10.3.81.235	10.3.81.235
237	10.3.81.236/32	10.3.81.236 – 10.3.81.236	10.3.81.236
238	10.3.81.237/32	10.3.81.237 – 10.3.81.237	10.3.81.237
239	10.3.81.238/32	10.3.81.238 – 10.3.81.238	10.3.81.238
240	10.3.81.239/32	10.3.81.239 – 10.3.81.239	10.3.81.239
241	10.3.81.240/32	10.3.81.240 – 10.3.81.240	10.3.81.240
242	10.3.81.241/32	10.3.81.241 – 10.3.81.241	10.3.81.241
243	10.3.81.242/32	10.3.81.242 – 10.3.81.242	10.3.81.242
244	10.3.81.243/32	10.3.81.243 – 10.3.81.243	10.3.81.243
245	10.3.81.244/32	10.3.81.244 – 10.3.81.244	10.3.81.244
246	10.3.81.245/32	10.3.81.245 – 10.3.81.245	10.3.81.245
247	10.3.81.246/32	10.3.81.246 – 10.3.81.246	10.3.81.246
248	10.3.81.247/32	10.3.81.247 – 10.3.81.247	10.3.81.247
249	10.3.81.248/32	10.3.81.248 – 10.3.81.248	10.3.81.248
250	10.3.81.249/32	10.3.81.249 – 10.3.81.249	10.3.81.249
251	10.3.81.250/32	10.3.81.250 – 10.3.81.250	10.3.81.250
252	10.3.81.251/32	10.3.81.251 – 10.3.81.251	10.3.81.251
253	10.3.81.252/32	10.3.81.252 – 10.3.81.252	10.3.81.252
254	10.3.81.253/32	10.3.81.253 – 10.3.81.253	10.3.81.253
255	10.3.81.254/32	10.3.81.254 – 10.3.81.254	10.3.81.254
256	10.3.81.255/32	10.3.81.255 – 10.3.81.255	10.3.81.255

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 →