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)10.0.30.0/23

network10.0.30.0/23

broadcast10.0.31.255

first host10.0.30.1

last host10.0.31.254

subnet mask255.255.254.0

wildcard0.0.1.255

addresses512

usable hosts510

classA

ipcalc 10.0.30.0/23

address00001010.00000000.00011110.00000000

subnet mask11111111.11111111.11111110.00000000

network00001010.00000000.00011110.00000000

broadcast00001010.00000000.00011111.11111111

green = network part, grey = host part

hex0x0a001e00

decimal167779840

reverse dns0.30.0.10.in-addr.arpa

ipv4-mapped::ffff:a00:1e00

/23 split into /32 · 512 subnets

close ×

#	network	host range	broadcast
1	10.0.30.0/32	10.0.30.0 – 10.0.30.0	10.0.30.0
2	10.0.30.1/32	10.0.30.1 – 10.0.30.1	10.0.30.1
3	10.0.30.2/32	10.0.30.2 – 10.0.30.2	10.0.30.2
4	10.0.30.3/32	10.0.30.3 – 10.0.30.3	10.0.30.3
5	10.0.30.4/32	10.0.30.4 – 10.0.30.4	10.0.30.4
6	10.0.30.5/32	10.0.30.5 – 10.0.30.5	10.0.30.5
7	10.0.30.6/32	10.0.30.6 – 10.0.30.6	10.0.30.6
8	10.0.30.7/32	10.0.30.7 – 10.0.30.7	10.0.30.7
9	10.0.30.8/32	10.0.30.8 – 10.0.30.8	10.0.30.8
10	10.0.30.9/32	10.0.30.9 – 10.0.30.9	10.0.30.9
11	10.0.30.10/32	10.0.30.10 – 10.0.30.10	10.0.30.10
12	10.0.30.11/32	10.0.30.11 – 10.0.30.11	10.0.30.11
13	10.0.30.12/32	10.0.30.12 – 10.0.30.12	10.0.30.12
14	10.0.30.13/32	10.0.30.13 – 10.0.30.13	10.0.30.13
15	10.0.30.14/32	10.0.30.14 – 10.0.30.14	10.0.30.14
16	10.0.30.15/32	10.0.30.15 – 10.0.30.15	10.0.30.15
17	10.0.30.16/32	10.0.30.16 – 10.0.30.16	10.0.30.16
18	10.0.30.17/32	10.0.30.17 – 10.0.30.17	10.0.30.17
19	10.0.30.18/32	10.0.30.18 – 10.0.30.18	10.0.30.18
20	10.0.30.19/32	10.0.30.19 – 10.0.30.19	10.0.30.19
21	10.0.30.20/32	10.0.30.20 – 10.0.30.20	10.0.30.20
22	10.0.30.21/32	10.0.30.21 – 10.0.30.21	10.0.30.21
23	10.0.30.22/32	10.0.30.22 – 10.0.30.22	10.0.30.22
24	10.0.30.23/32	10.0.30.23 – 10.0.30.23	10.0.30.23
25	10.0.30.24/32	10.0.30.24 – 10.0.30.24	10.0.30.24
26	10.0.30.25/32	10.0.30.25 – 10.0.30.25	10.0.30.25
27	10.0.30.26/32	10.0.30.26 – 10.0.30.26	10.0.30.26
28	10.0.30.27/32	10.0.30.27 – 10.0.30.27	10.0.30.27
29	10.0.30.28/32	10.0.30.28 – 10.0.30.28	10.0.30.28
30	10.0.30.29/32	10.0.30.29 – 10.0.30.29	10.0.30.29
31	10.0.30.30/32	10.0.30.30 – 10.0.30.30	10.0.30.30
32	10.0.30.31/32	10.0.30.31 – 10.0.30.31	10.0.30.31
33	10.0.30.32/32	10.0.30.32 – 10.0.30.32	10.0.30.32
34	10.0.30.33/32	10.0.30.33 – 10.0.30.33	10.0.30.33
35	10.0.30.34/32	10.0.30.34 – 10.0.30.34	10.0.30.34
36	10.0.30.35/32	10.0.30.35 – 10.0.30.35	10.0.30.35
37	10.0.30.36/32	10.0.30.36 – 10.0.30.36	10.0.30.36
38	10.0.30.37/32	10.0.30.37 – 10.0.30.37	10.0.30.37
39	10.0.30.38/32	10.0.30.38 – 10.0.30.38	10.0.30.38
40	10.0.30.39/32	10.0.30.39 – 10.0.30.39	10.0.30.39
41	10.0.30.40/32	10.0.30.40 – 10.0.30.40	10.0.30.40
42	10.0.30.41/32	10.0.30.41 – 10.0.30.41	10.0.30.41
43	10.0.30.42/32	10.0.30.42 – 10.0.30.42	10.0.30.42
44	10.0.30.43/32	10.0.30.43 – 10.0.30.43	10.0.30.43
45	10.0.30.44/32	10.0.30.44 – 10.0.30.44	10.0.30.44
46	10.0.30.45/32	10.0.30.45 – 10.0.30.45	10.0.30.45
47	10.0.30.46/32	10.0.30.46 – 10.0.30.46	10.0.30.46
48	10.0.30.47/32	10.0.30.47 – 10.0.30.47	10.0.30.47
49	10.0.30.48/32	10.0.30.48 – 10.0.30.48	10.0.30.48
50	10.0.30.49/32	10.0.30.49 – 10.0.30.49	10.0.30.49
51	10.0.30.50/32	10.0.30.50 – 10.0.30.50	10.0.30.50
52	10.0.30.51/32	10.0.30.51 – 10.0.30.51	10.0.30.51
53	10.0.30.52/32	10.0.30.52 – 10.0.30.52	10.0.30.52
54	10.0.30.53/32	10.0.30.53 – 10.0.30.53	10.0.30.53
55	10.0.30.54/32	10.0.30.54 – 10.0.30.54	10.0.30.54
56	10.0.30.55/32	10.0.30.55 – 10.0.30.55	10.0.30.55
57	10.0.30.56/32	10.0.30.56 – 10.0.30.56	10.0.30.56
58	10.0.30.57/32	10.0.30.57 – 10.0.30.57	10.0.30.57
59	10.0.30.58/32	10.0.30.58 – 10.0.30.58	10.0.30.58
60	10.0.30.59/32	10.0.30.59 – 10.0.30.59	10.0.30.59
61	10.0.30.60/32	10.0.30.60 – 10.0.30.60	10.0.30.60
62	10.0.30.61/32	10.0.30.61 – 10.0.30.61	10.0.30.61
63	10.0.30.62/32	10.0.30.62 – 10.0.30.62	10.0.30.62
64	10.0.30.63/32	10.0.30.63 – 10.0.30.63	10.0.30.63
65	10.0.30.64/32	10.0.30.64 – 10.0.30.64	10.0.30.64
66	10.0.30.65/32	10.0.30.65 – 10.0.30.65	10.0.30.65
67	10.0.30.66/32	10.0.30.66 – 10.0.30.66	10.0.30.66
68	10.0.30.67/32	10.0.30.67 – 10.0.30.67	10.0.30.67
69	10.0.30.68/32	10.0.30.68 – 10.0.30.68	10.0.30.68
70	10.0.30.69/32	10.0.30.69 – 10.0.30.69	10.0.30.69
71	10.0.30.70/32	10.0.30.70 – 10.0.30.70	10.0.30.70
72	10.0.30.71/32	10.0.30.71 – 10.0.30.71	10.0.30.71
73	10.0.30.72/32	10.0.30.72 – 10.0.30.72	10.0.30.72
74	10.0.30.73/32	10.0.30.73 – 10.0.30.73	10.0.30.73
75	10.0.30.74/32	10.0.30.74 – 10.0.30.74	10.0.30.74
76	10.0.30.75/32	10.0.30.75 – 10.0.30.75	10.0.30.75
77	10.0.30.76/32	10.0.30.76 – 10.0.30.76	10.0.30.76
78	10.0.30.77/32	10.0.30.77 – 10.0.30.77	10.0.30.77
79	10.0.30.78/32	10.0.30.78 – 10.0.30.78	10.0.30.78
80	10.0.30.79/32	10.0.30.79 – 10.0.30.79	10.0.30.79
81	10.0.30.80/32	10.0.30.80 – 10.0.30.80	10.0.30.80
82	10.0.30.81/32	10.0.30.81 – 10.0.30.81	10.0.30.81
83	10.0.30.82/32	10.0.30.82 – 10.0.30.82	10.0.30.82
84	10.0.30.83/32	10.0.30.83 – 10.0.30.83	10.0.30.83
85	10.0.30.84/32	10.0.30.84 – 10.0.30.84	10.0.30.84
86	10.0.30.85/32	10.0.30.85 – 10.0.30.85	10.0.30.85
87	10.0.30.86/32	10.0.30.86 – 10.0.30.86	10.0.30.86
88	10.0.30.87/32	10.0.30.87 – 10.0.30.87	10.0.30.87
89	10.0.30.88/32	10.0.30.88 – 10.0.30.88	10.0.30.88
90	10.0.30.89/32	10.0.30.89 – 10.0.30.89	10.0.30.89
91	10.0.30.90/32	10.0.30.90 – 10.0.30.90	10.0.30.90
92	10.0.30.91/32	10.0.30.91 – 10.0.30.91	10.0.30.91
93	10.0.30.92/32	10.0.30.92 – 10.0.30.92	10.0.30.92
94	10.0.30.93/32	10.0.30.93 – 10.0.30.93	10.0.30.93
95	10.0.30.94/32	10.0.30.94 – 10.0.30.94	10.0.30.94
96	10.0.30.95/32	10.0.30.95 – 10.0.30.95	10.0.30.95
97	10.0.30.96/32	10.0.30.96 – 10.0.30.96	10.0.30.96
98	10.0.30.97/32	10.0.30.97 – 10.0.30.97	10.0.30.97
99	10.0.30.98/32	10.0.30.98 – 10.0.30.98	10.0.30.98
100	10.0.30.99/32	10.0.30.99 – 10.0.30.99	10.0.30.99
101	10.0.30.100/32	10.0.30.100 – 10.0.30.100	10.0.30.100
102	10.0.30.101/32	10.0.30.101 – 10.0.30.101	10.0.30.101
103	10.0.30.102/32	10.0.30.102 – 10.0.30.102	10.0.30.102
104	10.0.30.103/32	10.0.30.103 – 10.0.30.103	10.0.30.103
105	10.0.30.104/32	10.0.30.104 – 10.0.30.104	10.0.30.104
106	10.0.30.105/32	10.0.30.105 – 10.0.30.105	10.0.30.105
107	10.0.30.106/32	10.0.30.106 – 10.0.30.106	10.0.30.106
108	10.0.30.107/32	10.0.30.107 – 10.0.30.107	10.0.30.107
109	10.0.30.108/32	10.0.30.108 – 10.0.30.108	10.0.30.108
110	10.0.30.109/32	10.0.30.109 – 10.0.30.109	10.0.30.109
111	10.0.30.110/32	10.0.30.110 – 10.0.30.110	10.0.30.110
112	10.0.30.111/32	10.0.30.111 – 10.0.30.111	10.0.30.111
113	10.0.30.112/32	10.0.30.112 – 10.0.30.112	10.0.30.112
114	10.0.30.113/32	10.0.30.113 – 10.0.30.113	10.0.30.113
115	10.0.30.114/32	10.0.30.114 – 10.0.30.114	10.0.30.114
116	10.0.30.115/32	10.0.30.115 – 10.0.30.115	10.0.30.115
117	10.0.30.116/32	10.0.30.116 – 10.0.30.116	10.0.30.116
118	10.0.30.117/32	10.0.30.117 – 10.0.30.117	10.0.30.117
119	10.0.30.118/32	10.0.30.118 – 10.0.30.118	10.0.30.118
120	10.0.30.119/32	10.0.30.119 – 10.0.30.119	10.0.30.119
121	10.0.30.120/32	10.0.30.120 – 10.0.30.120	10.0.30.120
122	10.0.30.121/32	10.0.30.121 – 10.0.30.121	10.0.30.121
123	10.0.30.122/32	10.0.30.122 – 10.0.30.122	10.0.30.122
124	10.0.30.123/32	10.0.30.123 – 10.0.30.123	10.0.30.123
125	10.0.30.124/32	10.0.30.124 – 10.0.30.124	10.0.30.124
126	10.0.30.125/32	10.0.30.125 – 10.0.30.125	10.0.30.125
127	10.0.30.126/32	10.0.30.126 – 10.0.30.126	10.0.30.126
128	10.0.30.127/32	10.0.30.127 – 10.0.30.127	10.0.30.127
129	10.0.30.128/32	10.0.30.128 – 10.0.30.128	10.0.30.128
130	10.0.30.129/32	10.0.30.129 – 10.0.30.129	10.0.30.129
131	10.0.30.130/32	10.0.30.130 – 10.0.30.130	10.0.30.130
132	10.0.30.131/32	10.0.30.131 – 10.0.30.131	10.0.30.131
133	10.0.30.132/32	10.0.30.132 – 10.0.30.132	10.0.30.132
134	10.0.30.133/32	10.0.30.133 – 10.0.30.133	10.0.30.133
135	10.0.30.134/32	10.0.30.134 – 10.0.30.134	10.0.30.134
136	10.0.30.135/32	10.0.30.135 – 10.0.30.135	10.0.30.135
137	10.0.30.136/32	10.0.30.136 – 10.0.30.136	10.0.30.136
138	10.0.30.137/32	10.0.30.137 – 10.0.30.137	10.0.30.137
139	10.0.30.138/32	10.0.30.138 – 10.0.30.138	10.0.30.138
140	10.0.30.139/32	10.0.30.139 – 10.0.30.139	10.0.30.139
141	10.0.30.140/32	10.0.30.140 – 10.0.30.140	10.0.30.140
142	10.0.30.141/32	10.0.30.141 – 10.0.30.141	10.0.30.141
143	10.0.30.142/32	10.0.30.142 – 10.0.30.142	10.0.30.142
144	10.0.30.143/32	10.0.30.143 – 10.0.30.143	10.0.30.143
145	10.0.30.144/32	10.0.30.144 – 10.0.30.144	10.0.30.144
146	10.0.30.145/32	10.0.30.145 – 10.0.30.145	10.0.30.145
147	10.0.30.146/32	10.0.30.146 – 10.0.30.146	10.0.30.146
148	10.0.30.147/32	10.0.30.147 – 10.0.30.147	10.0.30.147
149	10.0.30.148/32	10.0.30.148 – 10.0.30.148	10.0.30.148
150	10.0.30.149/32	10.0.30.149 – 10.0.30.149	10.0.30.149
151	10.0.30.150/32	10.0.30.150 – 10.0.30.150	10.0.30.150
152	10.0.30.151/32	10.0.30.151 – 10.0.30.151	10.0.30.151
153	10.0.30.152/32	10.0.30.152 – 10.0.30.152	10.0.30.152
154	10.0.30.153/32	10.0.30.153 – 10.0.30.153	10.0.30.153
155	10.0.30.154/32	10.0.30.154 – 10.0.30.154	10.0.30.154
156	10.0.30.155/32	10.0.30.155 – 10.0.30.155	10.0.30.155
157	10.0.30.156/32	10.0.30.156 – 10.0.30.156	10.0.30.156
158	10.0.30.157/32	10.0.30.157 – 10.0.30.157	10.0.30.157
159	10.0.30.158/32	10.0.30.158 – 10.0.30.158	10.0.30.158
160	10.0.30.159/32	10.0.30.159 – 10.0.30.159	10.0.30.159
161	10.0.30.160/32	10.0.30.160 – 10.0.30.160	10.0.30.160
162	10.0.30.161/32	10.0.30.161 – 10.0.30.161	10.0.30.161
163	10.0.30.162/32	10.0.30.162 – 10.0.30.162	10.0.30.162
164	10.0.30.163/32	10.0.30.163 – 10.0.30.163	10.0.30.163
165	10.0.30.164/32	10.0.30.164 – 10.0.30.164	10.0.30.164
166	10.0.30.165/32	10.0.30.165 – 10.0.30.165	10.0.30.165
167	10.0.30.166/32	10.0.30.166 – 10.0.30.166	10.0.30.166
168	10.0.30.167/32	10.0.30.167 – 10.0.30.167	10.0.30.167
169	10.0.30.168/32	10.0.30.168 – 10.0.30.168	10.0.30.168
170	10.0.30.169/32	10.0.30.169 – 10.0.30.169	10.0.30.169
171	10.0.30.170/32	10.0.30.170 – 10.0.30.170	10.0.30.170
172	10.0.30.171/32	10.0.30.171 – 10.0.30.171	10.0.30.171
173	10.0.30.172/32	10.0.30.172 – 10.0.30.172	10.0.30.172
174	10.0.30.173/32	10.0.30.173 – 10.0.30.173	10.0.30.173
175	10.0.30.174/32	10.0.30.174 – 10.0.30.174	10.0.30.174
176	10.0.30.175/32	10.0.30.175 – 10.0.30.175	10.0.30.175
177	10.0.30.176/32	10.0.30.176 – 10.0.30.176	10.0.30.176
178	10.0.30.177/32	10.0.30.177 – 10.0.30.177	10.0.30.177
179	10.0.30.178/32	10.0.30.178 – 10.0.30.178	10.0.30.178
180	10.0.30.179/32	10.0.30.179 – 10.0.30.179	10.0.30.179
181	10.0.30.180/32	10.0.30.180 – 10.0.30.180	10.0.30.180
182	10.0.30.181/32	10.0.30.181 – 10.0.30.181	10.0.30.181
183	10.0.30.182/32	10.0.30.182 – 10.0.30.182	10.0.30.182
184	10.0.30.183/32	10.0.30.183 – 10.0.30.183	10.0.30.183
185	10.0.30.184/32	10.0.30.184 – 10.0.30.184	10.0.30.184
186	10.0.30.185/32	10.0.30.185 – 10.0.30.185	10.0.30.185
187	10.0.30.186/32	10.0.30.186 – 10.0.30.186	10.0.30.186
188	10.0.30.187/32	10.0.30.187 – 10.0.30.187	10.0.30.187
189	10.0.30.188/32	10.0.30.188 – 10.0.30.188	10.0.30.188
190	10.0.30.189/32	10.0.30.189 – 10.0.30.189	10.0.30.189
191	10.0.30.190/32	10.0.30.190 – 10.0.30.190	10.0.30.190
192	10.0.30.191/32	10.0.30.191 – 10.0.30.191	10.0.30.191
193	10.0.30.192/32	10.0.30.192 – 10.0.30.192	10.0.30.192
194	10.0.30.193/32	10.0.30.193 – 10.0.30.193	10.0.30.193
195	10.0.30.194/32	10.0.30.194 – 10.0.30.194	10.0.30.194
196	10.0.30.195/32	10.0.30.195 – 10.0.30.195	10.0.30.195
197	10.0.30.196/32	10.0.30.196 – 10.0.30.196	10.0.30.196
198	10.0.30.197/32	10.0.30.197 – 10.0.30.197	10.0.30.197
199	10.0.30.198/32	10.0.30.198 – 10.0.30.198	10.0.30.198
200	10.0.30.199/32	10.0.30.199 – 10.0.30.199	10.0.30.199
201	10.0.30.200/32	10.0.30.200 – 10.0.30.200	10.0.30.200
202	10.0.30.201/32	10.0.30.201 – 10.0.30.201	10.0.30.201
203	10.0.30.202/32	10.0.30.202 – 10.0.30.202	10.0.30.202
204	10.0.30.203/32	10.0.30.203 – 10.0.30.203	10.0.30.203
205	10.0.30.204/32	10.0.30.204 – 10.0.30.204	10.0.30.204
206	10.0.30.205/32	10.0.30.205 – 10.0.30.205	10.0.30.205
207	10.0.30.206/32	10.0.30.206 – 10.0.30.206	10.0.30.206
208	10.0.30.207/32	10.0.30.207 – 10.0.30.207	10.0.30.207
209	10.0.30.208/32	10.0.30.208 – 10.0.30.208	10.0.30.208
210	10.0.30.209/32	10.0.30.209 – 10.0.30.209	10.0.30.209
211	10.0.30.210/32	10.0.30.210 – 10.0.30.210	10.0.30.210
212	10.0.30.211/32	10.0.30.211 – 10.0.30.211	10.0.30.211
213	10.0.30.212/32	10.0.30.212 – 10.0.30.212	10.0.30.212
214	10.0.30.213/32	10.0.30.213 – 10.0.30.213	10.0.30.213
215	10.0.30.214/32	10.0.30.214 – 10.0.30.214	10.0.30.214
216	10.0.30.215/32	10.0.30.215 – 10.0.30.215	10.0.30.215
217	10.0.30.216/32	10.0.30.216 – 10.0.30.216	10.0.30.216
218	10.0.30.217/32	10.0.30.217 – 10.0.30.217	10.0.30.217
219	10.0.30.218/32	10.0.30.218 – 10.0.30.218	10.0.30.218
220	10.0.30.219/32	10.0.30.219 – 10.0.30.219	10.0.30.219
221	10.0.30.220/32	10.0.30.220 – 10.0.30.220	10.0.30.220
222	10.0.30.221/32	10.0.30.221 – 10.0.30.221	10.0.30.221
223	10.0.30.222/32	10.0.30.222 – 10.0.30.222	10.0.30.222
224	10.0.30.223/32	10.0.30.223 – 10.0.30.223	10.0.30.223
225	10.0.30.224/32	10.0.30.224 – 10.0.30.224	10.0.30.224
226	10.0.30.225/32	10.0.30.225 – 10.0.30.225	10.0.30.225
227	10.0.30.226/32	10.0.30.226 – 10.0.30.226	10.0.30.226
228	10.0.30.227/32	10.0.30.227 – 10.0.30.227	10.0.30.227
229	10.0.30.228/32	10.0.30.228 – 10.0.30.228	10.0.30.228
230	10.0.30.229/32	10.0.30.229 – 10.0.30.229	10.0.30.229
231	10.0.30.230/32	10.0.30.230 – 10.0.30.230	10.0.30.230
232	10.0.30.231/32	10.0.30.231 – 10.0.30.231	10.0.30.231
233	10.0.30.232/32	10.0.30.232 – 10.0.30.232	10.0.30.232
234	10.0.30.233/32	10.0.30.233 – 10.0.30.233	10.0.30.233
235	10.0.30.234/32	10.0.30.234 – 10.0.30.234	10.0.30.234
236	10.0.30.235/32	10.0.30.235 – 10.0.30.235	10.0.30.235
237	10.0.30.236/32	10.0.30.236 – 10.0.30.236	10.0.30.236
238	10.0.30.237/32	10.0.30.237 – 10.0.30.237	10.0.30.237
239	10.0.30.238/32	10.0.30.238 – 10.0.30.238	10.0.30.238
240	10.0.30.239/32	10.0.30.239 – 10.0.30.239	10.0.30.239
241	10.0.30.240/32	10.0.30.240 – 10.0.30.240	10.0.30.240
242	10.0.30.241/32	10.0.30.241 – 10.0.30.241	10.0.30.241
243	10.0.30.242/32	10.0.30.242 – 10.0.30.242	10.0.30.242
244	10.0.30.243/32	10.0.30.243 – 10.0.30.243	10.0.30.243
245	10.0.30.244/32	10.0.30.244 – 10.0.30.244	10.0.30.244
246	10.0.30.245/32	10.0.30.245 – 10.0.30.245	10.0.30.245
247	10.0.30.246/32	10.0.30.246 – 10.0.30.246	10.0.30.246
248	10.0.30.247/32	10.0.30.247 – 10.0.30.247	10.0.30.247
249	10.0.30.248/32	10.0.30.248 – 10.0.30.248	10.0.30.248
250	10.0.30.249/32	10.0.30.249 – 10.0.30.249	10.0.30.249
251	10.0.30.250/32	10.0.30.250 – 10.0.30.250	10.0.30.250
252	10.0.30.251/32	10.0.30.251 – 10.0.30.251	10.0.30.251
253	10.0.30.252/32	10.0.30.252 – 10.0.30.252	10.0.30.252
254	10.0.30.253/32	10.0.30.253 – 10.0.30.253	10.0.30.253
255	10.0.30.254/32	10.0.30.254 – 10.0.30.254	10.0.30.254
256	10.0.30.255/32	10.0.30.255 – 10.0.30.255	10.0.30.255

showing 256 of 512

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 /23
/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	1
/24	255.255.255.0	256	254	2 split →
/25	255.255.255.128	128	126	4 split →
/26	255.255.255.192	64	62	8 split →
/27	255.255.255.224	32	30	16 split →
/28	255.255.255.240	16	14	32 split →
/29	255.255.255.248	8	6	64 split →
/30	255.255.255.252	4	2	128 split →
/31	255.255.255.254	2	2	256 split →
/32	255.255.255.255	1	1	512 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 →