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)10.178.78.0/23

network10.178.78.0/23

broadcast10.178.79.255

first host10.178.78.1

last host10.178.79.254

subnet mask255.255.254.0

wildcard0.0.1.255

addresses512

usable hosts510

classA

ipcalc 10.178.78.0/23

address00001010.10110010.01001110.00000000

subnet mask11111111.11111111.11111110.00000000

network00001010.10110010.01001110.00000000

broadcast00001010.10110010.01001111.11111111

green = network part, grey = host part

hex0x0ab24e00

decimal179457536

reverse dns0.78.178.10.in-addr.arpa

ipv4-mapped::ffff:ab2:4e00

/23 split into /31 · 256 subnets

close ×

#	network	host range	broadcast
1	10.178.78.0/31	10.178.78.0 – 10.178.78.1	10.178.78.1
2	10.178.78.2/31	10.178.78.2 – 10.178.78.3	10.178.78.3
3	10.178.78.4/31	10.178.78.4 – 10.178.78.5	10.178.78.5
4	10.178.78.6/31	10.178.78.6 – 10.178.78.7	10.178.78.7
5	10.178.78.8/31	10.178.78.8 – 10.178.78.9	10.178.78.9
6	10.178.78.10/31	10.178.78.10 – 10.178.78.11	10.178.78.11
7	10.178.78.12/31	10.178.78.12 – 10.178.78.13	10.178.78.13
8	10.178.78.14/31	10.178.78.14 – 10.178.78.15	10.178.78.15
9	10.178.78.16/31	10.178.78.16 – 10.178.78.17	10.178.78.17
10	10.178.78.18/31	10.178.78.18 – 10.178.78.19	10.178.78.19
11	10.178.78.20/31	10.178.78.20 – 10.178.78.21	10.178.78.21
12	10.178.78.22/31	10.178.78.22 – 10.178.78.23	10.178.78.23
13	10.178.78.24/31	10.178.78.24 – 10.178.78.25	10.178.78.25
14	10.178.78.26/31	10.178.78.26 – 10.178.78.27	10.178.78.27
15	10.178.78.28/31	10.178.78.28 – 10.178.78.29	10.178.78.29
16	10.178.78.30/31	10.178.78.30 – 10.178.78.31	10.178.78.31
17	10.178.78.32/31	10.178.78.32 – 10.178.78.33	10.178.78.33
18	10.178.78.34/31	10.178.78.34 – 10.178.78.35	10.178.78.35
19	10.178.78.36/31	10.178.78.36 – 10.178.78.37	10.178.78.37
20	10.178.78.38/31	10.178.78.38 – 10.178.78.39	10.178.78.39
21	10.178.78.40/31	10.178.78.40 – 10.178.78.41	10.178.78.41
22	10.178.78.42/31	10.178.78.42 – 10.178.78.43	10.178.78.43
23	10.178.78.44/31	10.178.78.44 – 10.178.78.45	10.178.78.45
24	10.178.78.46/31	10.178.78.46 – 10.178.78.47	10.178.78.47
25	10.178.78.48/31	10.178.78.48 – 10.178.78.49	10.178.78.49
26	10.178.78.50/31	10.178.78.50 – 10.178.78.51	10.178.78.51
27	10.178.78.52/31	10.178.78.52 – 10.178.78.53	10.178.78.53
28	10.178.78.54/31	10.178.78.54 – 10.178.78.55	10.178.78.55
29	10.178.78.56/31	10.178.78.56 – 10.178.78.57	10.178.78.57
30	10.178.78.58/31	10.178.78.58 – 10.178.78.59	10.178.78.59
31	10.178.78.60/31	10.178.78.60 – 10.178.78.61	10.178.78.61
32	10.178.78.62/31	10.178.78.62 – 10.178.78.63	10.178.78.63
33	10.178.78.64/31	10.178.78.64 – 10.178.78.65	10.178.78.65
34	10.178.78.66/31	10.178.78.66 – 10.178.78.67	10.178.78.67
35	10.178.78.68/31	10.178.78.68 – 10.178.78.69	10.178.78.69
36	10.178.78.70/31	10.178.78.70 – 10.178.78.71	10.178.78.71
37	10.178.78.72/31	10.178.78.72 – 10.178.78.73	10.178.78.73
38	10.178.78.74/31	10.178.78.74 – 10.178.78.75	10.178.78.75
39	10.178.78.76/31	10.178.78.76 – 10.178.78.77	10.178.78.77
40	10.178.78.78/31	10.178.78.78 – 10.178.78.79	10.178.78.79
41	10.178.78.80/31	10.178.78.80 – 10.178.78.81	10.178.78.81
42	10.178.78.82/31	10.178.78.82 – 10.178.78.83	10.178.78.83
43	10.178.78.84/31	10.178.78.84 – 10.178.78.85	10.178.78.85
44	10.178.78.86/31	10.178.78.86 – 10.178.78.87	10.178.78.87
45	10.178.78.88/31	10.178.78.88 – 10.178.78.89	10.178.78.89
46	10.178.78.90/31	10.178.78.90 – 10.178.78.91	10.178.78.91
47	10.178.78.92/31	10.178.78.92 – 10.178.78.93	10.178.78.93
48	10.178.78.94/31	10.178.78.94 – 10.178.78.95	10.178.78.95
49	10.178.78.96/31	10.178.78.96 – 10.178.78.97	10.178.78.97
50	10.178.78.98/31	10.178.78.98 – 10.178.78.99	10.178.78.99
51	10.178.78.100/31	10.178.78.100 – 10.178.78.101	10.178.78.101
52	10.178.78.102/31	10.178.78.102 – 10.178.78.103	10.178.78.103
53	10.178.78.104/31	10.178.78.104 – 10.178.78.105	10.178.78.105
54	10.178.78.106/31	10.178.78.106 – 10.178.78.107	10.178.78.107
55	10.178.78.108/31	10.178.78.108 – 10.178.78.109	10.178.78.109
56	10.178.78.110/31	10.178.78.110 – 10.178.78.111	10.178.78.111
57	10.178.78.112/31	10.178.78.112 – 10.178.78.113	10.178.78.113
58	10.178.78.114/31	10.178.78.114 – 10.178.78.115	10.178.78.115
59	10.178.78.116/31	10.178.78.116 – 10.178.78.117	10.178.78.117
60	10.178.78.118/31	10.178.78.118 – 10.178.78.119	10.178.78.119
61	10.178.78.120/31	10.178.78.120 – 10.178.78.121	10.178.78.121
62	10.178.78.122/31	10.178.78.122 – 10.178.78.123	10.178.78.123
63	10.178.78.124/31	10.178.78.124 – 10.178.78.125	10.178.78.125
64	10.178.78.126/31	10.178.78.126 – 10.178.78.127	10.178.78.127
65	10.178.78.128/31	10.178.78.128 – 10.178.78.129	10.178.78.129
66	10.178.78.130/31	10.178.78.130 – 10.178.78.131	10.178.78.131
67	10.178.78.132/31	10.178.78.132 – 10.178.78.133	10.178.78.133
68	10.178.78.134/31	10.178.78.134 – 10.178.78.135	10.178.78.135
69	10.178.78.136/31	10.178.78.136 – 10.178.78.137	10.178.78.137
70	10.178.78.138/31	10.178.78.138 – 10.178.78.139	10.178.78.139
71	10.178.78.140/31	10.178.78.140 – 10.178.78.141	10.178.78.141
72	10.178.78.142/31	10.178.78.142 – 10.178.78.143	10.178.78.143
73	10.178.78.144/31	10.178.78.144 – 10.178.78.145	10.178.78.145
74	10.178.78.146/31	10.178.78.146 – 10.178.78.147	10.178.78.147
75	10.178.78.148/31	10.178.78.148 – 10.178.78.149	10.178.78.149
76	10.178.78.150/31	10.178.78.150 – 10.178.78.151	10.178.78.151
77	10.178.78.152/31	10.178.78.152 – 10.178.78.153	10.178.78.153
78	10.178.78.154/31	10.178.78.154 – 10.178.78.155	10.178.78.155
79	10.178.78.156/31	10.178.78.156 – 10.178.78.157	10.178.78.157
80	10.178.78.158/31	10.178.78.158 – 10.178.78.159	10.178.78.159
81	10.178.78.160/31	10.178.78.160 – 10.178.78.161	10.178.78.161
82	10.178.78.162/31	10.178.78.162 – 10.178.78.163	10.178.78.163
83	10.178.78.164/31	10.178.78.164 – 10.178.78.165	10.178.78.165
84	10.178.78.166/31	10.178.78.166 – 10.178.78.167	10.178.78.167
85	10.178.78.168/31	10.178.78.168 – 10.178.78.169	10.178.78.169
86	10.178.78.170/31	10.178.78.170 – 10.178.78.171	10.178.78.171
87	10.178.78.172/31	10.178.78.172 – 10.178.78.173	10.178.78.173
88	10.178.78.174/31	10.178.78.174 – 10.178.78.175	10.178.78.175
89	10.178.78.176/31	10.178.78.176 – 10.178.78.177	10.178.78.177
90	10.178.78.178/31	10.178.78.178 – 10.178.78.179	10.178.78.179
91	10.178.78.180/31	10.178.78.180 – 10.178.78.181	10.178.78.181
92	10.178.78.182/31	10.178.78.182 – 10.178.78.183	10.178.78.183
93	10.178.78.184/31	10.178.78.184 – 10.178.78.185	10.178.78.185
94	10.178.78.186/31	10.178.78.186 – 10.178.78.187	10.178.78.187
95	10.178.78.188/31	10.178.78.188 – 10.178.78.189	10.178.78.189
96	10.178.78.190/31	10.178.78.190 – 10.178.78.191	10.178.78.191
97	10.178.78.192/31	10.178.78.192 – 10.178.78.193	10.178.78.193
98	10.178.78.194/31	10.178.78.194 – 10.178.78.195	10.178.78.195
99	10.178.78.196/31	10.178.78.196 – 10.178.78.197	10.178.78.197
100	10.178.78.198/31	10.178.78.198 – 10.178.78.199	10.178.78.199
101	10.178.78.200/31	10.178.78.200 – 10.178.78.201	10.178.78.201
102	10.178.78.202/31	10.178.78.202 – 10.178.78.203	10.178.78.203
103	10.178.78.204/31	10.178.78.204 – 10.178.78.205	10.178.78.205
104	10.178.78.206/31	10.178.78.206 – 10.178.78.207	10.178.78.207
105	10.178.78.208/31	10.178.78.208 – 10.178.78.209	10.178.78.209
106	10.178.78.210/31	10.178.78.210 – 10.178.78.211	10.178.78.211
107	10.178.78.212/31	10.178.78.212 – 10.178.78.213	10.178.78.213
108	10.178.78.214/31	10.178.78.214 – 10.178.78.215	10.178.78.215
109	10.178.78.216/31	10.178.78.216 – 10.178.78.217	10.178.78.217
110	10.178.78.218/31	10.178.78.218 – 10.178.78.219	10.178.78.219
111	10.178.78.220/31	10.178.78.220 – 10.178.78.221	10.178.78.221
112	10.178.78.222/31	10.178.78.222 – 10.178.78.223	10.178.78.223
113	10.178.78.224/31	10.178.78.224 – 10.178.78.225	10.178.78.225
114	10.178.78.226/31	10.178.78.226 – 10.178.78.227	10.178.78.227
115	10.178.78.228/31	10.178.78.228 – 10.178.78.229	10.178.78.229
116	10.178.78.230/31	10.178.78.230 – 10.178.78.231	10.178.78.231
117	10.178.78.232/31	10.178.78.232 – 10.178.78.233	10.178.78.233
118	10.178.78.234/31	10.178.78.234 – 10.178.78.235	10.178.78.235
119	10.178.78.236/31	10.178.78.236 – 10.178.78.237	10.178.78.237
120	10.178.78.238/31	10.178.78.238 – 10.178.78.239	10.178.78.239
121	10.178.78.240/31	10.178.78.240 – 10.178.78.241	10.178.78.241
122	10.178.78.242/31	10.178.78.242 – 10.178.78.243	10.178.78.243
123	10.178.78.244/31	10.178.78.244 – 10.178.78.245	10.178.78.245
124	10.178.78.246/31	10.178.78.246 – 10.178.78.247	10.178.78.247
125	10.178.78.248/31	10.178.78.248 – 10.178.78.249	10.178.78.249
126	10.178.78.250/31	10.178.78.250 – 10.178.78.251	10.178.78.251
127	10.178.78.252/31	10.178.78.252 – 10.178.78.253	10.178.78.253
128	10.178.78.254/31	10.178.78.254 – 10.178.78.255	10.178.78.255
129	10.178.79.0/31	10.178.79.0 – 10.178.79.1	10.178.79.1
130	10.178.79.2/31	10.178.79.2 – 10.178.79.3	10.178.79.3
131	10.178.79.4/31	10.178.79.4 – 10.178.79.5	10.178.79.5
132	10.178.79.6/31	10.178.79.6 – 10.178.79.7	10.178.79.7
133	10.178.79.8/31	10.178.79.8 – 10.178.79.9	10.178.79.9
134	10.178.79.10/31	10.178.79.10 – 10.178.79.11	10.178.79.11
135	10.178.79.12/31	10.178.79.12 – 10.178.79.13	10.178.79.13
136	10.178.79.14/31	10.178.79.14 – 10.178.79.15	10.178.79.15
137	10.178.79.16/31	10.178.79.16 – 10.178.79.17	10.178.79.17
138	10.178.79.18/31	10.178.79.18 – 10.178.79.19	10.178.79.19
139	10.178.79.20/31	10.178.79.20 – 10.178.79.21	10.178.79.21
140	10.178.79.22/31	10.178.79.22 – 10.178.79.23	10.178.79.23
141	10.178.79.24/31	10.178.79.24 – 10.178.79.25	10.178.79.25
142	10.178.79.26/31	10.178.79.26 – 10.178.79.27	10.178.79.27
143	10.178.79.28/31	10.178.79.28 – 10.178.79.29	10.178.79.29
144	10.178.79.30/31	10.178.79.30 – 10.178.79.31	10.178.79.31
145	10.178.79.32/31	10.178.79.32 – 10.178.79.33	10.178.79.33
146	10.178.79.34/31	10.178.79.34 – 10.178.79.35	10.178.79.35
147	10.178.79.36/31	10.178.79.36 – 10.178.79.37	10.178.79.37
148	10.178.79.38/31	10.178.79.38 – 10.178.79.39	10.178.79.39
149	10.178.79.40/31	10.178.79.40 – 10.178.79.41	10.178.79.41
150	10.178.79.42/31	10.178.79.42 – 10.178.79.43	10.178.79.43
151	10.178.79.44/31	10.178.79.44 – 10.178.79.45	10.178.79.45
152	10.178.79.46/31	10.178.79.46 – 10.178.79.47	10.178.79.47
153	10.178.79.48/31	10.178.79.48 – 10.178.79.49	10.178.79.49
154	10.178.79.50/31	10.178.79.50 – 10.178.79.51	10.178.79.51
155	10.178.79.52/31	10.178.79.52 – 10.178.79.53	10.178.79.53
156	10.178.79.54/31	10.178.79.54 – 10.178.79.55	10.178.79.55
157	10.178.79.56/31	10.178.79.56 – 10.178.79.57	10.178.79.57
158	10.178.79.58/31	10.178.79.58 – 10.178.79.59	10.178.79.59
159	10.178.79.60/31	10.178.79.60 – 10.178.79.61	10.178.79.61
160	10.178.79.62/31	10.178.79.62 – 10.178.79.63	10.178.79.63
161	10.178.79.64/31	10.178.79.64 – 10.178.79.65	10.178.79.65
162	10.178.79.66/31	10.178.79.66 – 10.178.79.67	10.178.79.67
163	10.178.79.68/31	10.178.79.68 – 10.178.79.69	10.178.79.69
164	10.178.79.70/31	10.178.79.70 – 10.178.79.71	10.178.79.71
165	10.178.79.72/31	10.178.79.72 – 10.178.79.73	10.178.79.73
166	10.178.79.74/31	10.178.79.74 – 10.178.79.75	10.178.79.75
167	10.178.79.76/31	10.178.79.76 – 10.178.79.77	10.178.79.77
168	10.178.79.78/31	10.178.79.78 – 10.178.79.79	10.178.79.79
169	10.178.79.80/31	10.178.79.80 – 10.178.79.81	10.178.79.81
170	10.178.79.82/31	10.178.79.82 – 10.178.79.83	10.178.79.83
171	10.178.79.84/31	10.178.79.84 – 10.178.79.85	10.178.79.85
172	10.178.79.86/31	10.178.79.86 – 10.178.79.87	10.178.79.87
173	10.178.79.88/31	10.178.79.88 – 10.178.79.89	10.178.79.89
174	10.178.79.90/31	10.178.79.90 – 10.178.79.91	10.178.79.91
175	10.178.79.92/31	10.178.79.92 – 10.178.79.93	10.178.79.93
176	10.178.79.94/31	10.178.79.94 – 10.178.79.95	10.178.79.95
177	10.178.79.96/31	10.178.79.96 – 10.178.79.97	10.178.79.97
178	10.178.79.98/31	10.178.79.98 – 10.178.79.99	10.178.79.99
179	10.178.79.100/31	10.178.79.100 – 10.178.79.101	10.178.79.101
180	10.178.79.102/31	10.178.79.102 – 10.178.79.103	10.178.79.103
181	10.178.79.104/31	10.178.79.104 – 10.178.79.105	10.178.79.105
182	10.178.79.106/31	10.178.79.106 – 10.178.79.107	10.178.79.107
183	10.178.79.108/31	10.178.79.108 – 10.178.79.109	10.178.79.109
184	10.178.79.110/31	10.178.79.110 – 10.178.79.111	10.178.79.111
185	10.178.79.112/31	10.178.79.112 – 10.178.79.113	10.178.79.113
186	10.178.79.114/31	10.178.79.114 – 10.178.79.115	10.178.79.115
187	10.178.79.116/31	10.178.79.116 – 10.178.79.117	10.178.79.117
188	10.178.79.118/31	10.178.79.118 – 10.178.79.119	10.178.79.119
189	10.178.79.120/31	10.178.79.120 – 10.178.79.121	10.178.79.121
190	10.178.79.122/31	10.178.79.122 – 10.178.79.123	10.178.79.123
191	10.178.79.124/31	10.178.79.124 – 10.178.79.125	10.178.79.125
192	10.178.79.126/31	10.178.79.126 – 10.178.79.127	10.178.79.127
193	10.178.79.128/31	10.178.79.128 – 10.178.79.129	10.178.79.129
194	10.178.79.130/31	10.178.79.130 – 10.178.79.131	10.178.79.131
195	10.178.79.132/31	10.178.79.132 – 10.178.79.133	10.178.79.133
196	10.178.79.134/31	10.178.79.134 – 10.178.79.135	10.178.79.135
197	10.178.79.136/31	10.178.79.136 – 10.178.79.137	10.178.79.137
198	10.178.79.138/31	10.178.79.138 – 10.178.79.139	10.178.79.139
199	10.178.79.140/31	10.178.79.140 – 10.178.79.141	10.178.79.141
200	10.178.79.142/31	10.178.79.142 – 10.178.79.143	10.178.79.143
201	10.178.79.144/31	10.178.79.144 – 10.178.79.145	10.178.79.145
202	10.178.79.146/31	10.178.79.146 – 10.178.79.147	10.178.79.147
203	10.178.79.148/31	10.178.79.148 – 10.178.79.149	10.178.79.149
204	10.178.79.150/31	10.178.79.150 – 10.178.79.151	10.178.79.151
205	10.178.79.152/31	10.178.79.152 – 10.178.79.153	10.178.79.153
206	10.178.79.154/31	10.178.79.154 – 10.178.79.155	10.178.79.155
207	10.178.79.156/31	10.178.79.156 – 10.178.79.157	10.178.79.157
208	10.178.79.158/31	10.178.79.158 – 10.178.79.159	10.178.79.159
209	10.178.79.160/31	10.178.79.160 – 10.178.79.161	10.178.79.161
210	10.178.79.162/31	10.178.79.162 – 10.178.79.163	10.178.79.163
211	10.178.79.164/31	10.178.79.164 – 10.178.79.165	10.178.79.165
212	10.178.79.166/31	10.178.79.166 – 10.178.79.167	10.178.79.167
213	10.178.79.168/31	10.178.79.168 – 10.178.79.169	10.178.79.169
214	10.178.79.170/31	10.178.79.170 – 10.178.79.171	10.178.79.171
215	10.178.79.172/31	10.178.79.172 – 10.178.79.173	10.178.79.173
216	10.178.79.174/31	10.178.79.174 – 10.178.79.175	10.178.79.175
217	10.178.79.176/31	10.178.79.176 – 10.178.79.177	10.178.79.177
218	10.178.79.178/31	10.178.79.178 – 10.178.79.179	10.178.79.179
219	10.178.79.180/31	10.178.79.180 – 10.178.79.181	10.178.79.181
220	10.178.79.182/31	10.178.79.182 – 10.178.79.183	10.178.79.183
221	10.178.79.184/31	10.178.79.184 – 10.178.79.185	10.178.79.185
222	10.178.79.186/31	10.178.79.186 – 10.178.79.187	10.178.79.187
223	10.178.79.188/31	10.178.79.188 – 10.178.79.189	10.178.79.189
224	10.178.79.190/31	10.178.79.190 – 10.178.79.191	10.178.79.191
225	10.178.79.192/31	10.178.79.192 – 10.178.79.193	10.178.79.193
226	10.178.79.194/31	10.178.79.194 – 10.178.79.195	10.178.79.195
227	10.178.79.196/31	10.178.79.196 – 10.178.79.197	10.178.79.197
228	10.178.79.198/31	10.178.79.198 – 10.178.79.199	10.178.79.199
229	10.178.79.200/31	10.178.79.200 – 10.178.79.201	10.178.79.201
230	10.178.79.202/31	10.178.79.202 – 10.178.79.203	10.178.79.203
231	10.178.79.204/31	10.178.79.204 – 10.178.79.205	10.178.79.205
232	10.178.79.206/31	10.178.79.206 – 10.178.79.207	10.178.79.207
233	10.178.79.208/31	10.178.79.208 – 10.178.79.209	10.178.79.209
234	10.178.79.210/31	10.178.79.210 – 10.178.79.211	10.178.79.211
235	10.178.79.212/31	10.178.79.212 – 10.178.79.213	10.178.79.213
236	10.178.79.214/31	10.178.79.214 – 10.178.79.215	10.178.79.215
237	10.178.79.216/31	10.178.79.216 – 10.178.79.217	10.178.79.217
238	10.178.79.218/31	10.178.79.218 – 10.178.79.219	10.178.79.219
239	10.178.79.220/31	10.178.79.220 – 10.178.79.221	10.178.79.221
240	10.178.79.222/31	10.178.79.222 – 10.178.79.223	10.178.79.223
241	10.178.79.224/31	10.178.79.224 – 10.178.79.225	10.178.79.225
242	10.178.79.226/31	10.178.79.226 – 10.178.79.227	10.178.79.227
243	10.178.79.228/31	10.178.79.228 – 10.178.79.229	10.178.79.229
244	10.178.79.230/31	10.178.79.230 – 10.178.79.231	10.178.79.231
245	10.178.79.232/31	10.178.79.232 – 10.178.79.233	10.178.79.233
246	10.178.79.234/31	10.178.79.234 – 10.178.79.235	10.178.79.235
247	10.178.79.236/31	10.178.79.236 – 10.178.79.237	10.178.79.237
248	10.178.79.238/31	10.178.79.238 – 10.178.79.239	10.178.79.239
249	10.178.79.240/31	10.178.79.240 – 10.178.79.241	10.178.79.241
250	10.178.79.242/31	10.178.79.242 – 10.178.79.243	10.178.79.243
251	10.178.79.244/31	10.178.79.244 – 10.178.79.245	10.178.79.245
252	10.178.79.246/31	10.178.79.246 – 10.178.79.247	10.178.79.247
253	10.178.79.248/31	10.178.79.248 – 10.178.79.249	10.178.79.249
254	10.178.79.250/31	10.178.79.250 – 10.178.79.251	10.178.79.251
255	10.178.79.252/31	10.178.79.252 – 10.178.79.253	10.178.79.253
256	10.178.79.254/31	10.178.79.254 – 10.178.79.255	10.178.79.255

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 /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 →