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)10.0.170.0/24

network10.0.170.0/24

broadcast10.0.170.255

first host10.0.170.1

last host10.0.170.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.0.170.0/24

address00001010.00000000.10101010.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.00000000.10101010.00000000

broadcast00001010.00000000.10101010.11111111

green = network part, grey = host part

hex0x0a00aa00

decimal167815680

reverse dns0.170.0.10.in-addr.arpa

ipv4-mapped::ffff:a00:aa00

/24 split into /32 · 256 subnets

close ×

#	network	host range	broadcast
1	10.0.170.0/32	10.0.170.0 – 10.0.170.0	10.0.170.0
2	10.0.170.1/32	10.0.170.1 – 10.0.170.1	10.0.170.1
3	10.0.170.2/32	10.0.170.2 – 10.0.170.2	10.0.170.2
4	10.0.170.3/32	10.0.170.3 – 10.0.170.3	10.0.170.3
5	10.0.170.4/32	10.0.170.4 – 10.0.170.4	10.0.170.4
6	10.0.170.5/32	10.0.170.5 – 10.0.170.5	10.0.170.5
7	10.0.170.6/32	10.0.170.6 – 10.0.170.6	10.0.170.6
8	10.0.170.7/32	10.0.170.7 – 10.0.170.7	10.0.170.7
9	10.0.170.8/32	10.0.170.8 – 10.0.170.8	10.0.170.8
10	10.0.170.9/32	10.0.170.9 – 10.0.170.9	10.0.170.9
11	10.0.170.10/32	10.0.170.10 – 10.0.170.10	10.0.170.10
12	10.0.170.11/32	10.0.170.11 – 10.0.170.11	10.0.170.11
13	10.0.170.12/32	10.0.170.12 – 10.0.170.12	10.0.170.12
14	10.0.170.13/32	10.0.170.13 – 10.0.170.13	10.0.170.13
15	10.0.170.14/32	10.0.170.14 – 10.0.170.14	10.0.170.14
16	10.0.170.15/32	10.0.170.15 – 10.0.170.15	10.0.170.15
17	10.0.170.16/32	10.0.170.16 – 10.0.170.16	10.0.170.16
18	10.0.170.17/32	10.0.170.17 – 10.0.170.17	10.0.170.17
19	10.0.170.18/32	10.0.170.18 – 10.0.170.18	10.0.170.18
20	10.0.170.19/32	10.0.170.19 – 10.0.170.19	10.0.170.19
21	10.0.170.20/32	10.0.170.20 – 10.0.170.20	10.0.170.20
22	10.0.170.21/32	10.0.170.21 – 10.0.170.21	10.0.170.21
23	10.0.170.22/32	10.0.170.22 – 10.0.170.22	10.0.170.22
24	10.0.170.23/32	10.0.170.23 – 10.0.170.23	10.0.170.23
25	10.0.170.24/32	10.0.170.24 – 10.0.170.24	10.0.170.24
26	10.0.170.25/32	10.0.170.25 – 10.0.170.25	10.0.170.25
27	10.0.170.26/32	10.0.170.26 – 10.0.170.26	10.0.170.26
28	10.0.170.27/32	10.0.170.27 – 10.0.170.27	10.0.170.27
29	10.0.170.28/32	10.0.170.28 – 10.0.170.28	10.0.170.28
30	10.0.170.29/32	10.0.170.29 – 10.0.170.29	10.0.170.29
31	10.0.170.30/32	10.0.170.30 – 10.0.170.30	10.0.170.30
32	10.0.170.31/32	10.0.170.31 – 10.0.170.31	10.0.170.31
33	10.0.170.32/32	10.0.170.32 – 10.0.170.32	10.0.170.32
34	10.0.170.33/32	10.0.170.33 – 10.0.170.33	10.0.170.33
35	10.0.170.34/32	10.0.170.34 – 10.0.170.34	10.0.170.34
36	10.0.170.35/32	10.0.170.35 – 10.0.170.35	10.0.170.35
37	10.0.170.36/32	10.0.170.36 – 10.0.170.36	10.0.170.36
38	10.0.170.37/32	10.0.170.37 – 10.0.170.37	10.0.170.37
39	10.0.170.38/32	10.0.170.38 – 10.0.170.38	10.0.170.38
40	10.0.170.39/32	10.0.170.39 – 10.0.170.39	10.0.170.39
41	10.0.170.40/32	10.0.170.40 – 10.0.170.40	10.0.170.40
42	10.0.170.41/32	10.0.170.41 – 10.0.170.41	10.0.170.41
43	10.0.170.42/32	10.0.170.42 – 10.0.170.42	10.0.170.42
44	10.0.170.43/32	10.0.170.43 – 10.0.170.43	10.0.170.43
45	10.0.170.44/32	10.0.170.44 – 10.0.170.44	10.0.170.44
46	10.0.170.45/32	10.0.170.45 – 10.0.170.45	10.0.170.45
47	10.0.170.46/32	10.0.170.46 – 10.0.170.46	10.0.170.46
48	10.0.170.47/32	10.0.170.47 – 10.0.170.47	10.0.170.47
49	10.0.170.48/32	10.0.170.48 – 10.0.170.48	10.0.170.48
50	10.0.170.49/32	10.0.170.49 – 10.0.170.49	10.0.170.49
51	10.0.170.50/32	10.0.170.50 – 10.0.170.50	10.0.170.50
52	10.0.170.51/32	10.0.170.51 – 10.0.170.51	10.0.170.51
53	10.0.170.52/32	10.0.170.52 – 10.0.170.52	10.0.170.52
54	10.0.170.53/32	10.0.170.53 – 10.0.170.53	10.0.170.53
55	10.0.170.54/32	10.0.170.54 – 10.0.170.54	10.0.170.54
56	10.0.170.55/32	10.0.170.55 – 10.0.170.55	10.0.170.55
57	10.0.170.56/32	10.0.170.56 – 10.0.170.56	10.0.170.56
58	10.0.170.57/32	10.0.170.57 – 10.0.170.57	10.0.170.57
59	10.0.170.58/32	10.0.170.58 – 10.0.170.58	10.0.170.58
60	10.0.170.59/32	10.0.170.59 – 10.0.170.59	10.0.170.59
61	10.0.170.60/32	10.0.170.60 – 10.0.170.60	10.0.170.60
62	10.0.170.61/32	10.0.170.61 – 10.0.170.61	10.0.170.61
63	10.0.170.62/32	10.0.170.62 – 10.0.170.62	10.0.170.62
64	10.0.170.63/32	10.0.170.63 – 10.0.170.63	10.0.170.63
65	10.0.170.64/32	10.0.170.64 – 10.0.170.64	10.0.170.64
66	10.0.170.65/32	10.0.170.65 – 10.0.170.65	10.0.170.65
67	10.0.170.66/32	10.0.170.66 – 10.0.170.66	10.0.170.66
68	10.0.170.67/32	10.0.170.67 – 10.0.170.67	10.0.170.67
69	10.0.170.68/32	10.0.170.68 – 10.0.170.68	10.0.170.68
70	10.0.170.69/32	10.0.170.69 – 10.0.170.69	10.0.170.69
71	10.0.170.70/32	10.0.170.70 – 10.0.170.70	10.0.170.70
72	10.0.170.71/32	10.0.170.71 – 10.0.170.71	10.0.170.71
73	10.0.170.72/32	10.0.170.72 – 10.0.170.72	10.0.170.72
74	10.0.170.73/32	10.0.170.73 – 10.0.170.73	10.0.170.73
75	10.0.170.74/32	10.0.170.74 – 10.0.170.74	10.0.170.74
76	10.0.170.75/32	10.0.170.75 – 10.0.170.75	10.0.170.75
77	10.0.170.76/32	10.0.170.76 – 10.0.170.76	10.0.170.76
78	10.0.170.77/32	10.0.170.77 – 10.0.170.77	10.0.170.77
79	10.0.170.78/32	10.0.170.78 – 10.0.170.78	10.0.170.78
80	10.0.170.79/32	10.0.170.79 – 10.0.170.79	10.0.170.79
81	10.0.170.80/32	10.0.170.80 – 10.0.170.80	10.0.170.80
82	10.0.170.81/32	10.0.170.81 – 10.0.170.81	10.0.170.81
83	10.0.170.82/32	10.0.170.82 – 10.0.170.82	10.0.170.82
84	10.0.170.83/32	10.0.170.83 – 10.0.170.83	10.0.170.83
85	10.0.170.84/32	10.0.170.84 – 10.0.170.84	10.0.170.84
86	10.0.170.85/32	10.0.170.85 – 10.0.170.85	10.0.170.85
87	10.0.170.86/32	10.0.170.86 – 10.0.170.86	10.0.170.86
88	10.0.170.87/32	10.0.170.87 – 10.0.170.87	10.0.170.87
89	10.0.170.88/32	10.0.170.88 – 10.0.170.88	10.0.170.88
90	10.0.170.89/32	10.0.170.89 – 10.0.170.89	10.0.170.89
91	10.0.170.90/32	10.0.170.90 – 10.0.170.90	10.0.170.90
92	10.0.170.91/32	10.0.170.91 – 10.0.170.91	10.0.170.91
93	10.0.170.92/32	10.0.170.92 – 10.0.170.92	10.0.170.92
94	10.0.170.93/32	10.0.170.93 – 10.0.170.93	10.0.170.93
95	10.0.170.94/32	10.0.170.94 – 10.0.170.94	10.0.170.94
96	10.0.170.95/32	10.0.170.95 – 10.0.170.95	10.0.170.95
97	10.0.170.96/32	10.0.170.96 – 10.0.170.96	10.0.170.96
98	10.0.170.97/32	10.0.170.97 – 10.0.170.97	10.0.170.97
99	10.0.170.98/32	10.0.170.98 – 10.0.170.98	10.0.170.98
100	10.0.170.99/32	10.0.170.99 – 10.0.170.99	10.0.170.99
101	10.0.170.100/32	10.0.170.100 – 10.0.170.100	10.0.170.100
102	10.0.170.101/32	10.0.170.101 – 10.0.170.101	10.0.170.101
103	10.0.170.102/32	10.0.170.102 – 10.0.170.102	10.0.170.102
104	10.0.170.103/32	10.0.170.103 – 10.0.170.103	10.0.170.103
105	10.0.170.104/32	10.0.170.104 – 10.0.170.104	10.0.170.104
106	10.0.170.105/32	10.0.170.105 – 10.0.170.105	10.0.170.105
107	10.0.170.106/32	10.0.170.106 – 10.0.170.106	10.0.170.106
108	10.0.170.107/32	10.0.170.107 – 10.0.170.107	10.0.170.107
109	10.0.170.108/32	10.0.170.108 – 10.0.170.108	10.0.170.108
110	10.0.170.109/32	10.0.170.109 – 10.0.170.109	10.0.170.109
111	10.0.170.110/32	10.0.170.110 – 10.0.170.110	10.0.170.110
112	10.0.170.111/32	10.0.170.111 – 10.0.170.111	10.0.170.111
113	10.0.170.112/32	10.0.170.112 – 10.0.170.112	10.0.170.112
114	10.0.170.113/32	10.0.170.113 – 10.0.170.113	10.0.170.113
115	10.0.170.114/32	10.0.170.114 – 10.0.170.114	10.0.170.114
116	10.0.170.115/32	10.0.170.115 – 10.0.170.115	10.0.170.115
117	10.0.170.116/32	10.0.170.116 – 10.0.170.116	10.0.170.116
118	10.0.170.117/32	10.0.170.117 – 10.0.170.117	10.0.170.117
119	10.0.170.118/32	10.0.170.118 – 10.0.170.118	10.0.170.118
120	10.0.170.119/32	10.0.170.119 – 10.0.170.119	10.0.170.119
121	10.0.170.120/32	10.0.170.120 – 10.0.170.120	10.0.170.120
122	10.0.170.121/32	10.0.170.121 – 10.0.170.121	10.0.170.121
123	10.0.170.122/32	10.0.170.122 – 10.0.170.122	10.0.170.122
124	10.0.170.123/32	10.0.170.123 – 10.0.170.123	10.0.170.123
125	10.0.170.124/32	10.0.170.124 – 10.0.170.124	10.0.170.124
126	10.0.170.125/32	10.0.170.125 – 10.0.170.125	10.0.170.125
127	10.0.170.126/32	10.0.170.126 – 10.0.170.126	10.0.170.126
128	10.0.170.127/32	10.0.170.127 – 10.0.170.127	10.0.170.127
129	10.0.170.128/32	10.0.170.128 – 10.0.170.128	10.0.170.128
130	10.0.170.129/32	10.0.170.129 – 10.0.170.129	10.0.170.129
131	10.0.170.130/32	10.0.170.130 – 10.0.170.130	10.0.170.130
132	10.0.170.131/32	10.0.170.131 – 10.0.170.131	10.0.170.131
133	10.0.170.132/32	10.0.170.132 – 10.0.170.132	10.0.170.132
134	10.0.170.133/32	10.0.170.133 – 10.0.170.133	10.0.170.133
135	10.0.170.134/32	10.0.170.134 – 10.0.170.134	10.0.170.134
136	10.0.170.135/32	10.0.170.135 – 10.0.170.135	10.0.170.135
137	10.0.170.136/32	10.0.170.136 – 10.0.170.136	10.0.170.136
138	10.0.170.137/32	10.0.170.137 – 10.0.170.137	10.0.170.137
139	10.0.170.138/32	10.0.170.138 – 10.0.170.138	10.0.170.138
140	10.0.170.139/32	10.0.170.139 – 10.0.170.139	10.0.170.139
141	10.0.170.140/32	10.0.170.140 – 10.0.170.140	10.0.170.140
142	10.0.170.141/32	10.0.170.141 – 10.0.170.141	10.0.170.141
143	10.0.170.142/32	10.0.170.142 – 10.0.170.142	10.0.170.142
144	10.0.170.143/32	10.0.170.143 – 10.0.170.143	10.0.170.143
145	10.0.170.144/32	10.0.170.144 – 10.0.170.144	10.0.170.144
146	10.0.170.145/32	10.0.170.145 – 10.0.170.145	10.0.170.145
147	10.0.170.146/32	10.0.170.146 – 10.0.170.146	10.0.170.146
148	10.0.170.147/32	10.0.170.147 – 10.0.170.147	10.0.170.147
149	10.0.170.148/32	10.0.170.148 – 10.0.170.148	10.0.170.148
150	10.0.170.149/32	10.0.170.149 – 10.0.170.149	10.0.170.149
151	10.0.170.150/32	10.0.170.150 – 10.0.170.150	10.0.170.150
152	10.0.170.151/32	10.0.170.151 – 10.0.170.151	10.0.170.151
153	10.0.170.152/32	10.0.170.152 – 10.0.170.152	10.0.170.152
154	10.0.170.153/32	10.0.170.153 – 10.0.170.153	10.0.170.153
155	10.0.170.154/32	10.0.170.154 – 10.0.170.154	10.0.170.154
156	10.0.170.155/32	10.0.170.155 – 10.0.170.155	10.0.170.155
157	10.0.170.156/32	10.0.170.156 – 10.0.170.156	10.0.170.156
158	10.0.170.157/32	10.0.170.157 – 10.0.170.157	10.0.170.157
159	10.0.170.158/32	10.0.170.158 – 10.0.170.158	10.0.170.158
160	10.0.170.159/32	10.0.170.159 – 10.0.170.159	10.0.170.159
161	10.0.170.160/32	10.0.170.160 – 10.0.170.160	10.0.170.160
162	10.0.170.161/32	10.0.170.161 – 10.0.170.161	10.0.170.161
163	10.0.170.162/32	10.0.170.162 – 10.0.170.162	10.0.170.162
164	10.0.170.163/32	10.0.170.163 – 10.0.170.163	10.0.170.163
165	10.0.170.164/32	10.0.170.164 – 10.0.170.164	10.0.170.164
166	10.0.170.165/32	10.0.170.165 – 10.0.170.165	10.0.170.165
167	10.0.170.166/32	10.0.170.166 – 10.0.170.166	10.0.170.166
168	10.0.170.167/32	10.0.170.167 – 10.0.170.167	10.0.170.167
169	10.0.170.168/32	10.0.170.168 – 10.0.170.168	10.0.170.168
170	10.0.170.169/32	10.0.170.169 – 10.0.170.169	10.0.170.169
171	10.0.170.170/32	10.0.170.170 – 10.0.170.170	10.0.170.170
172	10.0.170.171/32	10.0.170.171 – 10.0.170.171	10.0.170.171
173	10.0.170.172/32	10.0.170.172 – 10.0.170.172	10.0.170.172
174	10.0.170.173/32	10.0.170.173 – 10.0.170.173	10.0.170.173
175	10.0.170.174/32	10.0.170.174 – 10.0.170.174	10.0.170.174
176	10.0.170.175/32	10.0.170.175 – 10.0.170.175	10.0.170.175
177	10.0.170.176/32	10.0.170.176 – 10.0.170.176	10.0.170.176
178	10.0.170.177/32	10.0.170.177 – 10.0.170.177	10.0.170.177
179	10.0.170.178/32	10.0.170.178 – 10.0.170.178	10.0.170.178
180	10.0.170.179/32	10.0.170.179 – 10.0.170.179	10.0.170.179
181	10.0.170.180/32	10.0.170.180 – 10.0.170.180	10.0.170.180
182	10.0.170.181/32	10.0.170.181 – 10.0.170.181	10.0.170.181
183	10.0.170.182/32	10.0.170.182 – 10.0.170.182	10.0.170.182
184	10.0.170.183/32	10.0.170.183 – 10.0.170.183	10.0.170.183
185	10.0.170.184/32	10.0.170.184 – 10.0.170.184	10.0.170.184
186	10.0.170.185/32	10.0.170.185 – 10.0.170.185	10.0.170.185
187	10.0.170.186/32	10.0.170.186 – 10.0.170.186	10.0.170.186
188	10.0.170.187/32	10.0.170.187 – 10.0.170.187	10.0.170.187
189	10.0.170.188/32	10.0.170.188 – 10.0.170.188	10.0.170.188
190	10.0.170.189/32	10.0.170.189 – 10.0.170.189	10.0.170.189
191	10.0.170.190/32	10.0.170.190 – 10.0.170.190	10.0.170.190
192	10.0.170.191/32	10.0.170.191 – 10.0.170.191	10.0.170.191
193	10.0.170.192/32	10.0.170.192 – 10.0.170.192	10.0.170.192
194	10.0.170.193/32	10.0.170.193 – 10.0.170.193	10.0.170.193
195	10.0.170.194/32	10.0.170.194 – 10.0.170.194	10.0.170.194
196	10.0.170.195/32	10.0.170.195 – 10.0.170.195	10.0.170.195
197	10.0.170.196/32	10.0.170.196 – 10.0.170.196	10.0.170.196
198	10.0.170.197/32	10.0.170.197 – 10.0.170.197	10.0.170.197
199	10.0.170.198/32	10.0.170.198 – 10.0.170.198	10.0.170.198
200	10.0.170.199/32	10.0.170.199 – 10.0.170.199	10.0.170.199
201	10.0.170.200/32	10.0.170.200 – 10.0.170.200	10.0.170.200
202	10.0.170.201/32	10.0.170.201 – 10.0.170.201	10.0.170.201
203	10.0.170.202/32	10.0.170.202 – 10.0.170.202	10.0.170.202
204	10.0.170.203/32	10.0.170.203 – 10.0.170.203	10.0.170.203
205	10.0.170.204/32	10.0.170.204 – 10.0.170.204	10.0.170.204
206	10.0.170.205/32	10.0.170.205 – 10.0.170.205	10.0.170.205
207	10.0.170.206/32	10.0.170.206 – 10.0.170.206	10.0.170.206
208	10.0.170.207/32	10.0.170.207 – 10.0.170.207	10.0.170.207
209	10.0.170.208/32	10.0.170.208 – 10.0.170.208	10.0.170.208
210	10.0.170.209/32	10.0.170.209 – 10.0.170.209	10.0.170.209
211	10.0.170.210/32	10.0.170.210 – 10.0.170.210	10.0.170.210
212	10.0.170.211/32	10.0.170.211 – 10.0.170.211	10.0.170.211
213	10.0.170.212/32	10.0.170.212 – 10.0.170.212	10.0.170.212
214	10.0.170.213/32	10.0.170.213 – 10.0.170.213	10.0.170.213
215	10.0.170.214/32	10.0.170.214 – 10.0.170.214	10.0.170.214
216	10.0.170.215/32	10.0.170.215 – 10.0.170.215	10.0.170.215
217	10.0.170.216/32	10.0.170.216 – 10.0.170.216	10.0.170.216
218	10.0.170.217/32	10.0.170.217 – 10.0.170.217	10.0.170.217
219	10.0.170.218/32	10.0.170.218 – 10.0.170.218	10.0.170.218
220	10.0.170.219/32	10.0.170.219 – 10.0.170.219	10.0.170.219
221	10.0.170.220/32	10.0.170.220 – 10.0.170.220	10.0.170.220
222	10.0.170.221/32	10.0.170.221 – 10.0.170.221	10.0.170.221
223	10.0.170.222/32	10.0.170.222 – 10.0.170.222	10.0.170.222
224	10.0.170.223/32	10.0.170.223 – 10.0.170.223	10.0.170.223
225	10.0.170.224/32	10.0.170.224 – 10.0.170.224	10.0.170.224
226	10.0.170.225/32	10.0.170.225 – 10.0.170.225	10.0.170.225
227	10.0.170.226/32	10.0.170.226 – 10.0.170.226	10.0.170.226
228	10.0.170.227/32	10.0.170.227 – 10.0.170.227	10.0.170.227
229	10.0.170.228/32	10.0.170.228 – 10.0.170.228	10.0.170.228
230	10.0.170.229/32	10.0.170.229 – 10.0.170.229	10.0.170.229
231	10.0.170.230/32	10.0.170.230 – 10.0.170.230	10.0.170.230
232	10.0.170.231/32	10.0.170.231 – 10.0.170.231	10.0.170.231
233	10.0.170.232/32	10.0.170.232 – 10.0.170.232	10.0.170.232
234	10.0.170.233/32	10.0.170.233 – 10.0.170.233	10.0.170.233
235	10.0.170.234/32	10.0.170.234 – 10.0.170.234	10.0.170.234
236	10.0.170.235/32	10.0.170.235 – 10.0.170.235	10.0.170.235
237	10.0.170.236/32	10.0.170.236 – 10.0.170.236	10.0.170.236
238	10.0.170.237/32	10.0.170.237 – 10.0.170.237	10.0.170.237
239	10.0.170.238/32	10.0.170.238 – 10.0.170.238	10.0.170.238
240	10.0.170.239/32	10.0.170.239 – 10.0.170.239	10.0.170.239
241	10.0.170.240/32	10.0.170.240 – 10.0.170.240	10.0.170.240
242	10.0.170.241/32	10.0.170.241 – 10.0.170.241	10.0.170.241
243	10.0.170.242/32	10.0.170.242 – 10.0.170.242	10.0.170.242
244	10.0.170.243/32	10.0.170.243 – 10.0.170.243	10.0.170.243
245	10.0.170.244/32	10.0.170.244 – 10.0.170.244	10.0.170.244
246	10.0.170.245/32	10.0.170.245 – 10.0.170.245	10.0.170.245
247	10.0.170.246/32	10.0.170.246 – 10.0.170.246	10.0.170.246
248	10.0.170.247/32	10.0.170.247 – 10.0.170.247	10.0.170.247
249	10.0.170.248/32	10.0.170.248 – 10.0.170.248	10.0.170.248
250	10.0.170.249/32	10.0.170.249 – 10.0.170.249	10.0.170.249
251	10.0.170.250/32	10.0.170.250 – 10.0.170.250	10.0.170.250
252	10.0.170.251/32	10.0.170.251 – 10.0.170.251	10.0.170.251
253	10.0.170.252/32	10.0.170.252 – 10.0.170.252	10.0.170.252
254	10.0.170.253/32	10.0.170.253 – 10.0.170.253	10.0.170.253
255	10.0.170.254/32	10.0.170.254 – 10.0.170.254	10.0.170.254
256	10.0.170.255/32	10.0.170.255 – 10.0.170.255	10.0.170.255

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 →