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)10.30.8.0/24

network10.30.8.0/24

broadcast10.30.8.255

first host10.30.8.1

last host10.30.8.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.30.8.0/24

address00001010.00011110.00001000.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.00011110.00001000.00000000

broadcast00001010.00011110.00001000.11111111

green = network part, grey = host part

hex0x0a1e0800

decimal169740288

reverse dns0.8.30.10.in-addr.arpa

ipv4-mapped::ffff:a1e:800

/24 split into /32 · 256 subnets

close ×

#	network	host range	broadcast
1	10.30.8.0/32	10.30.8.0 – 10.30.8.0	10.30.8.0
2	10.30.8.1/32	10.30.8.1 – 10.30.8.1	10.30.8.1
3	10.30.8.2/32	10.30.8.2 – 10.30.8.2	10.30.8.2
4	10.30.8.3/32	10.30.8.3 – 10.30.8.3	10.30.8.3
5	10.30.8.4/32	10.30.8.4 – 10.30.8.4	10.30.8.4
6	10.30.8.5/32	10.30.8.5 – 10.30.8.5	10.30.8.5
7	10.30.8.6/32	10.30.8.6 – 10.30.8.6	10.30.8.6
8	10.30.8.7/32	10.30.8.7 – 10.30.8.7	10.30.8.7
9	10.30.8.8/32	10.30.8.8 – 10.30.8.8	10.30.8.8
10	10.30.8.9/32	10.30.8.9 – 10.30.8.9	10.30.8.9
11	10.30.8.10/32	10.30.8.10 – 10.30.8.10	10.30.8.10
12	10.30.8.11/32	10.30.8.11 – 10.30.8.11	10.30.8.11
13	10.30.8.12/32	10.30.8.12 – 10.30.8.12	10.30.8.12
14	10.30.8.13/32	10.30.8.13 – 10.30.8.13	10.30.8.13
15	10.30.8.14/32	10.30.8.14 – 10.30.8.14	10.30.8.14
16	10.30.8.15/32	10.30.8.15 – 10.30.8.15	10.30.8.15
17	10.30.8.16/32	10.30.8.16 – 10.30.8.16	10.30.8.16
18	10.30.8.17/32	10.30.8.17 – 10.30.8.17	10.30.8.17
19	10.30.8.18/32	10.30.8.18 – 10.30.8.18	10.30.8.18
20	10.30.8.19/32	10.30.8.19 – 10.30.8.19	10.30.8.19
21	10.30.8.20/32	10.30.8.20 – 10.30.8.20	10.30.8.20
22	10.30.8.21/32	10.30.8.21 – 10.30.8.21	10.30.8.21
23	10.30.8.22/32	10.30.8.22 – 10.30.8.22	10.30.8.22
24	10.30.8.23/32	10.30.8.23 – 10.30.8.23	10.30.8.23
25	10.30.8.24/32	10.30.8.24 – 10.30.8.24	10.30.8.24
26	10.30.8.25/32	10.30.8.25 – 10.30.8.25	10.30.8.25
27	10.30.8.26/32	10.30.8.26 – 10.30.8.26	10.30.8.26
28	10.30.8.27/32	10.30.8.27 – 10.30.8.27	10.30.8.27
29	10.30.8.28/32	10.30.8.28 – 10.30.8.28	10.30.8.28
30	10.30.8.29/32	10.30.8.29 – 10.30.8.29	10.30.8.29
31	10.30.8.30/32	10.30.8.30 – 10.30.8.30	10.30.8.30
32	10.30.8.31/32	10.30.8.31 – 10.30.8.31	10.30.8.31
33	10.30.8.32/32	10.30.8.32 – 10.30.8.32	10.30.8.32
34	10.30.8.33/32	10.30.8.33 – 10.30.8.33	10.30.8.33
35	10.30.8.34/32	10.30.8.34 – 10.30.8.34	10.30.8.34
36	10.30.8.35/32	10.30.8.35 – 10.30.8.35	10.30.8.35
37	10.30.8.36/32	10.30.8.36 – 10.30.8.36	10.30.8.36
38	10.30.8.37/32	10.30.8.37 – 10.30.8.37	10.30.8.37
39	10.30.8.38/32	10.30.8.38 – 10.30.8.38	10.30.8.38
40	10.30.8.39/32	10.30.8.39 – 10.30.8.39	10.30.8.39
41	10.30.8.40/32	10.30.8.40 – 10.30.8.40	10.30.8.40
42	10.30.8.41/32	10.30.8.41 – 10.30.8.41	10.30.8.41
43	10.30.8.42/32	10.30.8.42 – 10.30.8.42	10.30.8.42
44	10.30.8.43/32	10.30.8.43 – 10.30.8.43	10.30.8.43
45	10.30.8.44/32	10.30.8.44 – 10.30.8.44	10.30.8.44
46	10.30.8.45/32	10.30.8.45 – 10.30.8.45	10.30.8.45
47	10.30.8.46/32	10.30.8.46 – 10.30.8.46	10.30.8.46
48	10.30.8.47/32	10.30.8.47 – 10.30.8.47	10.30.8.47
49	10.30.8.48/32	10.30.8.48 – 10.30.8.48	10.30.8.48
50	10.30.8.49/32	10.30.8.49 – 10.30.8.49	10.30.8.49
51	10.30.8.50/32	10.30.8.50 – 10.30.8.50	10.30.8.50
52	10.30.8.51/32	10.30.8.51 – 10.30.8.51	10.30.8.51
53	10.30.8.52/32	10.30.8.52 – 10.30.8.52	10.30.8.52
54	10.30.8.53/32	10.30.8.53 – 10.30.8.53	10.30.8.53
55	10.30.8.54/32	10.30.8.54 – 10.30.8.54	10.30.8.54
56	10.30.8.55/32	10.30.8.55 – 10.30.8.55	10.30.8.55
57	10.30.8.56/32	10.30.8.56 – 10.30.8.56	10.30.8.56
58	10.30.8.57/32	10.30.8.57 – 10.30.8.57	10.30.8.57
59	10.30.8.58/32	10.30.8.58 – 10.30.8.58	10.30.8.58
60	10.30.8.59/32	10.30.8.59 – 10.30.8.59	10.30.8.59
61	10.30.8.60/32	10.30.8.60 – 10.30.8.60	10.30.8.60
62	10.30.8.61/32	10.30.8.61 – 10.30.8.61	10.30.8.61
63	10.30.8.62/32	10.30.8.62 – 10.30.8.62	10.30.8.62
64	10.30.8.63/32	10.30.8.63 – 10.30.8.63	10.30.8.63
65	10.30.8.64/32	10.30.8.64 – 10.30.8.64	10.30.8.64
66	10.30.8.65/32	10.30.8.65 – 10.30.8.65	10.30.8.65
67	10.30.8.66/32	10.30.8.66 – 10.30.8.66	10.30.8.66
68	10.30.8.67/32	10.30.8.67 – 10.30.8.67	10.30.8.67
69	10.30.8.68/32	10.30.8.68 – 10.30.8.68	10.30.8.68
70	10.30.8.69/32	10.30.8.69 – 10.30.8.69	10.30.8.69
71	10.30.8.70/32	10.30.8.70 – 10.30.8.70	10.30.8.70
72	10.30.8.71/32	10.30.8.71 – 10.30.8.71	10.30.8.71
73	10.30.8.72/32	10.30.8.72 – 10.30.8.72	10.30.8.72
74	10.30.8.73/32	10.30.8.73 – 10.30.8.73	10.30.8.73
75	10.30.8.74/32	10.30.8.74 – 10.30.8.74	10.30.8.74
76	10.30.8.75/32	10.30.8.75 – 10.30.8.75	10.30.8.75
77	10.30.8.76/32	10.30.8.76 – 10.30.8.76	10.30.8.76
78	10.30.8.77/32	10.30.8.77 – 10.30.8.77	10.30.8.77
79	10.30.8.78/32	10.30.8.78 – 10.30.8.78	10.30.8.78
80	10.30.8.79/32	10.30.8.79 – 10.30.8.79	10.30.8.79
81	10.30.8.80/32	10.30.8.80 – 10.30.8.80	10.30.8.80
82	10.30.8.81/32	10.30.8.81 – 10.30.8.81	10.30.8.81
83	10.30.8.82/32	10.30.8.82 – 10.30.8.82	10.30.8.82
84	10.30.8.83/32	10.30.8.83 – 10.30.8.83	10.30.8.83
85	10.30.8.84/32	10.30.8.84 – 10.30.8.84	10.30.8.84
86	10.30.8.85/32	10.30.8.85 – 10.30.8.85	10.30.8.85
87	10.30.8.86/32	10.30.8.86 – 10.30.8.86	10.30.8.86
88	10.30.8.87/32	10.30.8.87 – 10.30.8.87	10.30.8.87
89	10.30.8.88/32	10.30.8.88 – 10.30.8.88	10.30.8.88
90	10.30.8.89/32	10.30.8.89 – 10.30.8.89	10.30.8.89
91	10.30.8.90/32	10.30.8.90 – 10.30.8.90	10.30.8.90
92	10.30.8.91/32	10.30.8.91 – 10.30.8.91	10.30.8.91
93	10.30.8.92/32	10.30.8.92 – 10.30.8.92	10.30.8.92
94	10.30.8.93/32	10.30.8.93 – 10.30.8.93	10.30.8.93
95	10.30.8.94/32	10.30.8.94 – 10.30.8.94	10.30.8.94
96	10.30.8.95/32	10.30.8.95 – 10.30.8.95	10.30.8.95
97	10.30.8.96/32	10.30.8.96 – 10.30.8.96	10.30.8.96
98	10.30.8.97/32	10.30.8.97 – 10.30.8.97	10.30.8.97
99	10.30.8.98/32	10.30.8.98 – 10.30.8.98	10.30.8.98
100	10.30.8.99/32	10.30.8.99 – 10.30.8.99	10.30.8.99
101	10.30.8.100/32	10.30.8.100 – 10.30.8.100	10.30.8.100
102	10.30.8.101/32	10.30.8.101 – 10.30.8.101	10.30.8.101
103	10.30.8.102/32	10.30.8.102 – 10.30.8.102	10.30.8.102
104	10.30.8.103/32	10.30.8.103 – 10.30.8.103	10.30.8.103
105	10.30.8.104/32	10.30.8.104 – 10.30.8.104	10.30.8.104
106	10.30.8.105/32	10.30.8.105 – 10.30.8.105	10.30.8.105
107	10.30.8.106/32	10.30.8.106 – 10.30.8.106	10.30.8.106
108	10.30.8.107/32	10.30.8.107 – 10.30.8.107	10.30.8.107
109	10.30.8.108/32	10.30.8.108 – 10.30.8.108	10.30.8.108
110	10.30.8.109/32	10.30.8.109 – 10.30.8.109	10.30.8.109
111	10.30.8.110/32	10.30.8.110 – 10.30.8.110	10.30.8.110
112	10.30.8.111/32	10.30.8.111 – 10.30.8.111	10.30.8.111
113	10.30.8.112/32	10.30.8.112 – 10.30.8.112	10.30.8.112
114	10.30.8.113/32	10.30.8.113 – 10.30.8.113	10.30.8.113
115	10.30.8.114/32	10.30.8.114 – 10.30.8.114	10.30.8.114
116	10.30.8.115/32	10.30.8.115 – 10.30.8.115	10.30.8.115
117	10.30.8.116/32	10.30.8.116 – 10.30.8.116	10.30.8.116
118	10.30.8.117/32	10.30.8.117 – 10.30.8.117	10.30.8.117
119	10.30.8.118/32	10.30.8.118 – 10.30.8.118	10.30.8.118
120	10.30.8.119/32	10.30.8.119 – 10.30.8.119	10.30.8.119
121	10.30.8.120/32	10.30.8.120 – 10.30.8.120	10.30.8.120
122	10.30.8.121/32	10.30.8.121 – 10.30.8.121	10.30.8.121
123	10.30.8.122/32	10.30.8.122 – 10.30.8.122	10.30.8.122
124	10.30.8.123/32	10.30.8.123 – 10.30.8.123	10.30.8.123
125	10.30.8.124/32	10.30.8.124 – 10.30.8.124	10.30.8.124
126	10.30.8.125/32	10.30.8.125 – 10.30.8.125	10.30.8.125
127	10.30.8.126/32	10.30.8.126 – 10.30.8.126	10.30.8.126
128	10.30.8.127/32	10.30.8.127 – 10.30.8.127	10.30.8.127
129	10.30.8.128/32	10.30.8.128 – 10.30.8.128	10.30.8.128
130	10.30.8.129/32	10.30.8.129 – 10.30.8.129	10.30.8.129
131	10.30.8.130/32	10.30.8.130 – 10.30.8.130	10.30.8.130
132	10.30.8.131/32	10.30.8.131 – 10.30.8.131	10.30.8.131
133	10.30.8.132/32	10.30.8.132 – 10.30.8.132	10.30.8.132
134	10.30.8.133/32	10.30.8.133 – 10.30.8.133	10.30.8.133
135	10.30.8.134/32	10.30.8.134 – 10.30.8.134	10.30.8.134
136	10.30.8.135/32	10.30.8.135 – 10.30.8.135	10.30.8.135
137	10.30.8.136/32	10.30.8.136 – 10.30.8.136	10.30.8.136
138	10.30.8.137/32	10.30.8.137 – 10.30.8.137	10.30.8.137
139	10.30.8.138/32	10.30.8.138 – 10.30.8.138	10.30.8.138
140	10.30.8.139/32	10.30.8.139 – 10.30.8.139	10.30.8.139
141	10.30.8.140/32	10.30.8.140 – 10.30.8.140	10.30.8.140
142	10.30.8.141/32	10.30.8.141 – 10.30.8.141	10.30.8.141
143	10.30.8.142/32	10.30.8.142 – 10.30.8.142	10.30.8.142
144	10.30.8.143/32	10.30.8.143 – 10.30.8.143	10.30.8.143
145	10.30.8.144/32	10.30.8.144 – 10.30.8.144	10.30.8.144
146	10.30.8.145/32	10.30.8.145 – 10.30.8.145	10.30.8.145
147	10.30.8.146/32	10.30.8.146 – 10.30.8.146	10.30.8.146
148	10.30.8.147/32	10.30.8.147 – 10.30.8.147	10.30.8.147
149	10.30.8.148/32	10.30.8.148 – 10.30.8.148	10.30.8.148
150	10.30.8.149/32	10.30.8.149 – 10.30.8.149	10.30.8.149
151	10.30.8.150/32	10.30.8.150 – 10.30.8.150	10.30.8.150
152	10.30.8.151/32	10.30.8.151 – 10.30.8.151	10.30.8.151
153	10.30.8.152/32	10.30.8.152 – 10.30.8.152	10.30.8.152
154	10.30.8.153/32	10.30.8.153 – 10.30.8.153	10.30.8.153
155	10.30.8.154/32	10.30.8.154 – 10.30.8.154	10.30.8.154
156	10.30.8.155/32	10.30.8.155 – 10.30.8.155	10.30.8.155
157	10.30.8.156/32	10.30.8.156 – 10.30.8.156	10.30.8.156
158	10.30.8.157/32	10.30.8.157 – 10.30.8.157	10.30.8.157
159	10.30.8.158/32	10.30.8.158 – 10.30.8.158	10.30.8.158
160	10.30.8.159/32	10.30.8.159 – 10.30.8.159	10.30.8.159
161	10.30.8.160/32	10.30.8.160 – 10.30.8.160	10.30.8.160
162	10.30.8.161/32	10.30.8.161 – 10.30.8.161	10.30.8.161
163	10.30.8.162/32	10.30.8.162 – 10.30.8.162	10.30.8.162
164	10.30.8.163/32	10.30.8.163 – 10.30.8.163	10.30.8.163
165	10.30.8.164/32	10.30.8.164 – 10.30.8.164	10.30.8.164
166	10.30.8.165/32	10.30.8.165 – 10.30.8.165	10.30.8.165
167	10.30.8.166/32	10.30.8.166 – 10.30.8.166	10.30.8.166
168	10.30.8.167/32	10.30.8.167 – 10.30.8.167	10.30.8.167
169	10.30.8.168/32	10.30.8.168 – 10.30.8.168	10.30.8.168
170	10.30.8.169/32	10.30.8.169 – 10.30.8.169	10.30.8.169
171	10.30.8.170/32	10.30.8.170 – 10.30.8.170	10.30.8.170
172	10.30.8.171/32	10.30.8.171 – 10.30.8.171	10.30.8.171
173	10.30.8.172/32	10.30.8.172 – 10.30.8.172	10.30.8.172
174	10.30.8.173/32	10.30.8.173 – 10.30.8.173	10.30.8.173
175	10.30.8.174/32	10.30.8.174 – 10.30.8.174	10.30.8.174
176	10.30.8.175/32	10.30.8.175 – 10.30.8.175	10.30.8.175
177	10.30.8.176/32	10.30.8.176 – 10.30.8.176	10.30.8.176
178	10.30.8.177/32	10.30.8.177 – 10.30.8.177	10.30.8.177
179	10.30.8.178/32	10.30.8.178 – 10.30.8.178	10.30.8.178
180	10.30.8.179/32	10.30.8.179 – 10.30.8.179	10.30.8.179
181	10.30.8.180/32	10.30.8.180 – 10.30.8.180	10.30.8.180
182	10.30.8.181/32	10.30.8.181 – 10.30.8.181	10.30.8.181
183	10.30.8.182/32	10.30.8.182 – 10.30.8.182	10.30.8.182
184	10.30.8.183/32	10.30.8.183 – 10.30.8.183	10.30.8.183
185	10.30.8.184/32	10.30.8.184 – 10.30.8.184	10.30.8.184
186	10.30.8.185/32	10.30.8.185 – 10.30.8.185	10.30.8.185
187	10.30.8.186/32	10.30.8.186 – 10.30.8.186	10.30.8.186
188	10.30.8.187/32	10.30.8.187 – 10.30.8.187	10.30.8.187
189	10.30.8.188/32	10.30.8.188 – 10.30.8.188	10.30.8.188
190	10.30.8.189/32	10.30.8.189 – 10.30.8.189	10.30.8.189
191	10.30.8.190/32	10.30.8.190 – 10.30.8.190	10.30.8.190
192	10.30.8.191/32	10.30.8.191 – 10.30.8.191	10.30.8.191
193	10.30.8.192/32	10.30.8.192 – 10.30.8.192	10.30.8.192
194	10.30.8.193/32	10.30.8.193 – 10.30.8.193	10.30.8.193
195	10.30.8.194/32	10.30.8.194 – 10.30.8.194	10.30.8.194
196	10.30.8.195/32	10.30.8.195 – 10.30.8.195	10.30.8.195
197	10.30.8.196/32	10.30.8.196 – 10.30.8.196	10.30.8.196
198	10.30.8.197/32	10.30.8.197 – 10.30.8.197	10.30.8.197
199	10.30.8.198/32	10.30.8.198 – 10.30.8.198	10.30.8.198
200	10.30.8.199/32	10.30.8.199 – 10.30.8.199	10.30.8.199
201	10.30.8.200/32	10.30.8.200 – 10.30.8.200	10.30.8.200
202	10.30.8.201/32	10.30.8.201 – 10.30.8.201	10.30.8.201
203	10.30.8.202/32	10.30.8.202 – 10.30.8.202	10.30.8.202
204	10.30.8.203/32	10.30.8.203 – 10.30.8.203	10.30.8.203
205	10.30.8.204/32	10.30.8.204 – 10.30.8.204	10.30.8.204
206	10.30.8.205/32	10.30.8.205 – 10.30.8.205	10.30.8.205
207	10.30.8.206/32	10.30.8.206 – 10.30.8.206	10.30.8.206
208	10.30.8.207/32	10.30.8.207 – 10.30.8.207	10.30.8.207
209	10.30.8.208/32	10.30.8.208 – 10.30.8.208	10.30.8.208
210	10.30.8.209/32	10.30.8.209 – 10.30.8.209	10.30.8.209
211	10.30.8.210/32	10.30.8.210 – 10.30.8.210	10.30.8.210
212	10.30.8.211/32	10.30.8.211 – 10.30.8.211	10.30.8.211
213	10.30.8.212/32	10.30.8.212 – 10.30.8.212	10.30.8.212
214	10.30.8.213/32	10.30.8.213 – 10.30.8.213	10.30.8.213
215	10.30.8.214/32	10.30.8.214 – 10.30.8.214	10.30.8.214
216	10.30.8.215/32	10.30.8.215 – 10.30.8.215	10.30.8.215
217	10.30.8.216/32	10.30.8.216 – 10.30.8.216	10.30.8.216
218	10.30.8.217/32	10.30.8.217 – 10.30.8.217	10.30.8.217
219	10.30.8.218/32	10.30.8.218 – 10.30.8.218	10.30.8.218
220	10.30.8.219/32	10.30.8.219 – 10.30.8.219	10.30.8.219
221	10.30.8.220/32	10.30.8.220 – 10.30.8.220	10.30.8.220
222	10.30.8.221/32	10.30.8.221 – 10.30.8.221	10.30.8.221
223	10.30.8.222/32	10.30.8.222 – 10.30.8.222	10.30.8.222
224	10.30.8.223/32	10.30.8.223 – 10.30.8.223	10.30.8.223
225	10.30.8.224/32	10.30.8.224 – 10.30.8.224	10.30.8.224
226	10.30.8.225/32	10.30.8.225 – 10.30.8.225	10.30.8.225
227	10.30.8.226/32	10.30.8.226 – 10.30.8.226	10.30.8.226
228	10.30.8.227/32	10.30.8.227 – 10.30.8.227	10.30.8.227
229	10.30.8.228/32	10.30.8.228 – 10.30.8.228	10.30.8.228
230	10.30.8.229/32	10.30.8.229 – 10.30.8.229	10.30.8.229
231	10.30.8.230/32	10.30.8.230 – 10.30.8.230	10.30.8.230
232	10.30.8.231/32	10.30.8.231 – 10.30.8.231	10.30.8.231
233	10.30.8.232/32	10.30.8.232 – 10.30.8.232	10.30.8.232
234	10.30.8.233/32	10.30.8.233 – 10.30.8.233	10.30.8.233
235	10.30.8.234/32	10.30.8.234 – 10.30.8.234	10.30.8.234
236	10.30.8.235/32	10.30.8.235 – 10.30.8.235	10.30.8.235
237	10.30.8.236/32	10.30.8.236 – 10.30.8.236	10.30.8.236
238	10.30.8.237/32	10.30.8.237 – 10.30.8.237	10.30.8.237
239	10.30.8.238/32	10.30.8.238 – 10.30.8.238	10.30.8.238
240	10.30.8.239/32	10.30.8.239 – 10.30.8.239	10.30.8.239
241	10.30.8.240/32	10.30.8.240 – 10.30.8.240	10.30.8.240
242	10.30.8.241/32	10.30.8.241 – 10.30.8.241	10.30.8.241
243	10.30.8.242/32	10.30.8.242 – 10.30.8.242	10.30.8.242
244	10.30.8.243/32	10.30.8.243 – 10.30.8.243	10.30.8.243
245	10.30.8.244/32	10.30.8.244 – 10.30.8.244	10.30.8.244
246	10.30.8.245/32	10.30.8.245 – 10.30.8.245	10.30.8.245
247	10.30.8.246/32	10.30.8.246 – 10.30.8.246	10.30.8.246
248	10.30.8.247/32	10.30.8.247 – 10.30.8.247	10.30.8.247
249	10.30.8.248/32	10.30.8.248 – 10.30.8.248	10.30.8.248
250	10.30.8.249/32	10.30.8.249 – 10.30.8.249	10.30.8.249
251	10.30.8.250/32	10.30.8.250 – 10.30.8.250	10.30.8.250
252	10.30.8.251/32	10.30.8.251 – 10.30.8.251	10.30.8.251
253	10.30.8.252/32	10.30.8.252 – 10.30.8.252	10.30.8.252
254	10.30.8.253/32	10.30.8.253 – 10.30.8.253	10.30.8.253
255	10.30.8.254/32	10.30.8.254 – 10.30.8.254	10.30.8.254
256	10.30.8.255/32	10.30.8.255 – 10.30.8.255	10.30.8.255

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 →