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)10.78.180.0/23

network10.78.180.0/23

broadcast10.78.181.255

first host10.78.180.1

last host10.78.181.254

subnet mask255.255.254.0

wildcard0.0.1.255

addresses512

usable hosts510

classA

ipcalc 10.78.180.0/23

address00001010.01001110.10110100.00000000

subnet mask11111111.11111111.11111110.00000000

network00001010.01001110.10110100.00000000

broadcast00001010.01001110.10110101.11111111

green = network part, grey = host part

hex0x0a4eb400

decimal172930048

reverse dns0.180.78.10.in-addr.arpa

ipv4-mapped::ffff:a4e:b400

/23 split into /31 · 256 subnets

close ×

#	network	host range	broadcast
1	10.78.180.0/31	10.78.180.0 – 10.78.180.1	10.78.180.1
2	10.78.180.2/31	10.78.180.2 – 10.78.180.3	10.78.180.3
3	10.78.180.4/31	10.78.180.4 – 10.78.180.5	10.78.180.5
4	10.78.180.6/31	10.78.180.6 – 10.78.180.7	10.78.180.7
5	10.78.180.8/31	10.78.180.8 – 10.78.180.9	10.78.180.9
6	10.78.180.10/31	10.78.180.10 – 10.78.180.11	10.78.180.11
7	10.78.180.12/31	10.78.180.12 – 10.78.180.13	10.78.180.13
8	10.78.180.14/31	10.78.180.14 – 10.78.180.15	10.78.180.15
9	10.78.180.16/31	10.78.180.16 – 10.78.180.17	10.78.180.17
10	10.78.180.18/31	10.78.180.18 – 10.78.180.19	10.78.180.19
11	10.78.180.20/31	10.78.180.20 – 10.78.180.21	10.78.180.21
12	10.78.180.22/31	10.78.180.22 – 10.78.180.23	10.78.180.23
13	10.78.180.24/31	10.78.180.24 – 10.78.180.25	10.78.180.25
14	10.78.180.26/31	10.78.180.26 – 10.78.180.27	10.78.180.27
15	10.78.180.28/31	10.78.180.28 – 10.78.180.29	10.78.180.29
16	10.78.180.30/31	10.78.180.30 – 10.78.180.31	10.78.180.31
17	10.78.180.32/31	10.78.180.32 – 10.78.180.33	10.78.180.33
18	10.78.180.34/31	10.78.180.34 – 10.78.180.35	10.78.180.35
19	10.78.180.36/31	10.78.180.36 – 10.78.180.37	10.78.180.37
20	10.78.180.38/31	10.78.180.38 – 10.78.180.39	10.78.180.39
21	10.78.180.40/31	10.78.180.40 – 10.78.180.41	10.78.180.41
22	10.78.180.42/31	10.78.180.42 – 10.78.180.43	10.78.180.43
23	10.78.180.44/31	10.78.180.44 – 10.78.180.45	10.78.180.45
24	10.78.180.46/31	10.78.180.46 – 10.78.180.47	10.78.180.47
25	10.78.180.48/31	10.78.180.48 – 10.78.180.49	10.78.180.49
26	10.78.180.50/31	10.78.180.50 – 10.78.180.51	10.78.180.51
27	10.78.180.52/31	10.78.180.52 – 10.78.180.53	10.78.180.53
28	10.78.180.54/31	10.78.180.54 – 10.78.180.55	10.78.180.55
29	10.78.180.56/31	10.78.180.56 – 10.78.180.57	10.78.180.57
30	10.78.180.58/31	10.78.180.58 – 10.78.180.59	10.78.180.59
31	10.78.180.60/31	10.78.180.60 – 10.78.180.61	10.78.180.61
32	10.78.180.62/31	10.78.180.62 – 10.78.180.63	10.78.180.63
33	10.78.180.64/31	10.78.180.64 – 10.78.180.65	10.78.180.65
34	10.78.180.66/31	10.78.180.66 – 10.78.180.67	10.78.180.67
35	10.78.180.68/31	10.78.180.68 – 10.78.180.69	10.78.180.69
36	10.78.180.70/31	10.78.180.70 – 10.78.180.71	10.78.180.71
37	10.78.180.72/31	10.78.180.72 – 10.78.180.73	10.78.180.73
38	10.78.180.74/31	10.78.180.74 – 10.78.180.75	10.78.180.75
39	10.78.180.76/31	10.78.180.76 – 10.78.180.77	10.78.180.77
40	10.78.180.78/31	10.78.180.78 – 10.78.180.79	10.78.180.79
41	10.78.180.80/31	10.78.180.80 – 10.78.180.81	10.78.180.81
42	10.78.180.82/31	10.78.180.82 – 10.78.180.83	10.78.180.83
43	10.78.180.84/31	10.78.180.84 – 10.78.180.85	10.78.180.85
44	10.78.180.86/31	10.78.180.86 – 10.78.180.87	10.78.180.87
45	10.78.180.88/31	10.78.180.88 – 10.78.180.89	10.78.180.89
46	10.78.180.90/31	10.78.180.90 – 10.78.180.91	10.78.180.91
47	10.78.180.92/31	10.78.180.92 – 10.78.180.93	10.78.180.93
48	10.78.180.94/31	10.78.180.94 – 10.78.180.95	10.78.180.95
49	10.78.180.96/31	10.78.180.96 – 10.78.180.97	10.78.180.97
50	10.78.180.98/31	10.78.180.98 – 10.78.180.99	10.78.180.99
51	10.78.180.100/31	10.78.180.100 – 10.78.180.101	10.78.180.101
52	10.78.180.102/31	10.78.180.102 – 10.78.180.103	10.78.180.103
53	10.78.180.104/31	10.78.180.104 – 10.78.180.105	10.78.180.105
54	10.78.180.106/31	10.78.180.106 – 10.78.180.107	10.78.180.107
55	10.78.180.108/31	10.78.180.108 – 10.78.180.109	10.78.180.109
56	10.78.180.110/31	10.78.180.110 – 10.78.180.111	10.78.180.111
57	10.78.180.112/31	10.78.180.112 – 10.78.180.113	10.78.180.113
58	10.78.180.114/31	10.78.180.114 – 10.78.180.115	10.78.180.115
59	10.78.180.116/31	10.78.180.116 – 10.78.180.117	10.78.180.117
60	10.78.180.118/31	10.78.180.118 – 10.78.180.119	10.78.180.119
61	10.78.180.120/31	10.78.180.120 – 10.78.180.121	10.78.180.121
62	10.78.180.122/31	10.78.180.122 – 10.78.180.123	10.78.180.123
63	10.78.180.124/31	10.78.180.124 – 10.78.180.125	10.78.180.125
64	10.78.180.126/31	10.78.180.126 – 10.78.180.127	10.78.180.127
65	10.78.180.128/31	10.78.180.128 – 10.78.180.129	10.78.180.129
66	10.78.180.130/31	10.78.180.130 – 10.78.180.131	10.78.180.131
67	10.78.180.132/31	10.78.180.132 – 10.78.180.133	10.78.180.133
68	10.78.180.134/31	10.78.180.134 – 10.78.180.135	10.78.180.135
69	10.78.180.136/31	10.78.180.136 – 10.78.180.137	10.78.180.137
70	10.78.180.138/31	10.78.180.138 – 10.78.180.139	10.78.180.139
71	10.78.180.140/31	10.78.180.140 – 10.78.180.141	10.78.180.141
72	10.78.180.142/31	10.78.180.142 – 10.78.180.143	10.78.180.143
73	10.78.180.144/31	10.78.180.144 – 10.78.180.145	10.78.180.145
74	10.78.180.146/31	10.78.180.146 – 10.78.180.147	10.78.180.147
75	10.78.180.148/31	10.78.180.148 – 10.78.180.149	10.78.180.149
76	10.78.180.150/31	10.78.180.150 – 10.78.180.151	10.78.180.151
77	10.78.180.152/31	10.78.180.152 – 10.78.180.153	10.78.180.153
78	10.78.180.154/31	10.78.180.154 – 10.78.180.155	10.78.180.155
79	10.78.180.156/31	10.78.180.156 – 10.78.180.157	10.78.180.157
80	10.78.180.158/31	10.78.180.158 – 10.78.180.159	10.78.180.159
81	10.78.180.160/31	10.78.180.160 – 10.78.180.161	10.78.180.161
82	10.78.180.162/31	10.78.180.162 – 10.78.180.163	10.78.180.163
83	10.78.180.164/31	10.78.180.164 – 10.78.180.165	10.78.180.165
84	10.78.180.166/31	10.78.180.166 – 10.78.180.167	10.78.180.167
85	10.78.180.168/31	10.78.180.168 – 10.78.180.169	10.78.180.169
86	10.78.180.170/31	10.78.180.170 – 10.78.180.171	10.78.180.171
87	10.78.180.172/31	10.78.180.172 – 10.78.180.173	10.78.180.173
88	10.78.180.174/31	10.78.180.174 – 10.78.180.175	10.78.180.175
89	10.78.180.176/31	10.78.180.176 – 10.78.180.177	10.78.180.177
90	10.78.180.178/31	10.78.180.178 – 10.78.180.179	10.78.180.179
91	10.78.180.180/31	10.78.180.180 – 10.78.180.181	10.78.180.181
92	10.78.180.182/31	10.78.180.182 – 10.78.180.183	10.78.180.183
93	10.78.180.184/31	10.78.180.184 – 10.78.180.185	10.78.180.185
94	10.78.180.186/31	10.78.180.186 – 10.78.180.187	10.78.180.187
95	10.78.180.188/31	10.78.180.188 – 10.78.180.189	10.78.180.189
96	10.78.180.190/31	10.78.180.190 – 10.78.180.191	10.78.180.191
97	10.78.180.192/31	10.78.180.192 – 10.78.180.193	10.78.180.193
98	10.78.180.194/31	10.78.180.194 – 10.78.180.195	10.78.180.195
99	10.78.180.196/31	10.78.180.196 – 10.78.180.197	10.78.180.197
100	10.78.180.198/31	10.78.180.198 – 10.78.180.199	10.78.180.199
101	10.78.180.200/31	10.78.180.200 – 10.78.180.201	10.78.180.201
102	10.78.180.202/31	10.78.180.202 – 10.78.180.203	10.78.180.203
103	10.78.180.204/31	10.78.180.204 – 10.78.180.205	10.78.180.205
104	10.78.180.206/31	10.78.180.206 – 10.78.180.207	10.78.180.207
105	10.78.180.208/31	10.78.180.208 – 10.78.180.209	10.78.180.209
106	10.78.180.210/31	10.78.180.210 – 10.78.180.211	10.78.180.211
107	10.78.180.212/31	10.78.180.212 – 10.78.180.213	10.78.180.213
108	10.78.180.214/31	10.78.180.214 – 10.78.180.215	10.78.180.215
109	10.78.180.216/31	10.78.180.216 – 10.78.180.217	10.78.180.217
110	10.78.180.218/31	10.78.180.218 – 10.78.180.219	10.78.180.219
111	10.78.180.220/31	10.78.180.220 – 10.78.180.221	10.78.180.221
112	10.78.180.222/31	10.78.180.222 – 10.78.180.223	10.78.180.223
113	10.78.180.224/31	10.78.180.224 – 10.78.180.225	10.78.180.225
114	10.78.180.226/31	10.78.180.226 – 10.78.180.227	10.78.180.227
115	10.78.180.228/31	10.78.180.228 – 10.78.180.229	10.78.180.229
116	10.78.180.230/31	10.78.180.230 – 10.78.180.231	10.78.180.231
117	10.78.180.232/31	10.78.180.232 – 10.78.180.233	10.78.180.233
118	10.78.180.234/31	10.78.180.234 – 10.78.180.235	10.78.180.235
119	10.78.180.236/31	10.78.180.236 – 10.78.180.237	10.78.180.237
120	10.78.180.238/31	10.78.180.238 – 10.78.180.239	10.78.180.239
121	10.78.180.240/31	10.78.180.240 – 10.78.180.241	10.78.180.241
122	10.78.180.242/31	10.78.180.242 – 10.78.180.243	10.78.180.243
123	10.78.180.244/31	10.78.180.244 – 10.78.180.245	10.78.180.245
124	10.78.180.246/31	10.78.180.246 – 10.78.180.247	10.78.180.247
125	10.78.180.248/31	10.78.180.248 – 10.78.180.249	10.78.180.249
126	10.78.180.250/31	10.78.180.250 – 10.78.180.251	10.78.180.251
127	10.78.180.252/31	10.78.180.252 – 10.78.180.253	10.78.180.253
128	10.78.180.254/31	10.78.180.254 – 10.78.180.255	10.78.180.255
129	10.78.181.0/31	10.78.181.0 – 10.78.181.1	10.78.181.1
130	10.78.181.2/31	10.78.181.2 – 10.78.181.3	10.78.181.3
131	10.78.181.4/31	10.78.181.4 – 10.78.181.5	10.78.181.5
132	10.78.181.6/31	10.78.181.6 – 10.78.181.7	10.78.181.7
133	10.78.181.8/31	10.78.181.8 – 10.78.181.9	10.78.181.9
134	10.78.181.10/31	10.78.181.10 – 10.78.181.11	10.78.181.11
135	10.78.181.12/31	10.78.181.12 – 10.78.181.13	10.78.181.13
136	10.78.181.14/31	10.78.181.14 – 10.78.181.15	10.78.181.15
137	10.78.181.16/31	10.78.181.16 – 10.78.181.17	10.78.181.17
138	10.78.181.18/31	10.78.181.18 – 10.78.181.19	10.78.181.19
139	10.78.181.20/31	10.78.181.20 – 10.78.181.21	10.78.181.21
140	10.78.181.22/31	10.78.181.22 – 10.78.181.23	10.78.181.23
141	10.78.181.24/31	10.78.181.24 – 10.78.181.25	10.78.181.25
142	10.78.181.26/31	10.78.181.26 – 10.78.181.27	10.78.181.27
143	10.78.181.28/31	10.78.181.28 – 10.78.181.29	10.78.181.29
144	10.78.181.30/31	10.78.181.30 – 10.78.181.31	10.78.181.31
145	10.78.181.32/31	10.78.181.32 – 10.78.181.33	10.78.181.33
146	10.78.181.34/31	10.78.181.34 – 10.78.181.35	10.78.181.35
147	10.78.181.36/31	10.78.181.36 – 10.78.181.37	10.78.181.37
148	10.78.181.38/31	10.78.181.38 – 10.78.181.39	10.78.181.39
149	10.78.181.40/31	10.78.181.40 – 10.78.181.41	10.78.181.41
150	10.78.181.42/31	10.78.181.42 – 10.78.181.43	10.78.181.43
151	10.78.181.44/31	10.78.181.44 – 10.78.181.45	10.78.181.45
152	10.78.181.46/31	10.78.181.46 – 10.78.181.47	10.78.181.47
153	10.78.181.48/31	10.78.181.48 – 10.78.181.49	10.78.181.49
154	10.78.181.50/31	10.78.181.50 – 10.78.181.51	10.78.181.51
155	10.78.181.52/31	10.78.181.52 – 10.78.181.53	10.78.181.53
156	10.78.181.54/31	10.78.181.54 – 10.78.181.55	10.78.181.55
157	10.78.181.56/31	10.78.181.56 – 10.78.181.57	10.78.181.57
158	10.78.181.58/31	10.78.181.58 – 10.78.181.59	10.78.181.59
159	10.78.181.60/31	10.78.181.60 – 10.78.181.61	10.78.181.61
160	10.78.181.62/31	10.78.181.62 – 10.78.181.63	10.78.181.63
161	10.78.181.64/31	10.78.181.64 – 10.78.181.65	10.78.181.65
162	10.78.181.66/31	10.78.181.66 – 10.78.181.67	10.78.181.67
163	10.78.181.68/31	10.78.181.68 – 10.78.181.69	10.78.181.69
164	10.78.181.70/31	10.78.181.70 – 10.78.181.71	10.78.181.71
165	10.78.181.72/31	10.78.181.72 – 10.78.181.73	10.78.181.73
166	10.78.181.74/31	10.78.181.74 – 10.78.181.75	10.78.181.75
167	10.78.181.76/31	10.78.181.76 – 10.78.181.77	10.78.181.77
168	10.78.181.78/31	10.78.181.78 – 10.78.181.79	10.78.181.79
169	10.78.181.80/31	10.78.181.80 – 10.78.181.81	10.78.181.81
170	10.78.181.82/31	10.78.181.82 – 10.78.181.83	10.78.181.83
171	10.78.181.84/31	10.78.181.84 – 10.78.181.85	10.78.181.85
172	10.78.181.86/31	10.78.181.86 – 10.78.181.87	10.78.181.87
173	10.78.181.88/31	10.78.181.88 – 10.78.181.89	10.78.181.89
174	10.78.181.90/31	10.78.181.90 – 10.78.181.91	10.78.181.91
175	10.78.181.92/31	10.78.181.92 – 10.78.181.93	10.78.181.93
176	10.78.181.94/31	10.78.181.94 – 10.78.181.95	10.78.181.95
177	10.78.181.96/31	10.78.181.96 – 10.78.181.97	10.78.181.97
178	10.78.181.98/31	10.78.181.98 – 10.78.181.99	10.78.181.99
179	10.78.181.100/31	10.78.181.100 – 10.78.181.101	10.78.181.101
180	10.78.181.102/31	10.78.181.102 – 10.78.181.103	10.78.181.103
181	10.78.181.104/31	10.78.181.104 – 10.78.181.105	10.78.181.105
182	10.78.181.106/31	10.78.181.106 – 10.78.181.107	10.78.181.107
183	10.78.181.108/31	10.78.181.108 – 10.78.181.109	10.78.181.109
184	10.78.181.110/31	10.78.181.110 – 10.78.181.111	10.78.181.111
185	10.78.181.112/31	10.78.181.112 – 10.78.181.113	10.78.181.113
186	10.78.181.114/31	10.78.181.114 – 10.78.181.115	10.78.181.115
187	10.78.181.116/31	10.78.181.116 – 10.78.181.117	10.78.181.117
188	10.78.181.118/31	10.78.181.118 – 10.78.181.119	10.78.181.119
189	10.78.181.120/31	10.78.181.120 – 10.78.181.121	10.78.181.121
190	10.78.181.122/31	10.78.181.122 – 10.78.181.123	10.78.181.123
191	10.78.181.124/31	10.78.181.124 – 10.78.181.125	10.78.181.125
192	10.78.181.126/31	10.78.181.126 – 10.78.181.127	10.78.181.127
193	10.78.181.128/31	10.78.181.128 – 10.78.181.129	10.78.181.129
194	10.78.181.130/31	10.78.181.130 – 10.78.181.131	10.78.181.131
195	10.78.181.132/31	10.78.181.132 – 10.78.181.133	10.78.181.133
196	10.78.181.134/31	10.78.181.134 – 10.78.181.135	10.78.181.135
197	10.78.181.136/31	10.78.181.136 – 10.78.181.137	10.78.181.137
198	10.78.181.138/31	10.78.181.138 – 10.78.181.139	10.78.181.139
199	10.78.181.140/31	10.78.181.140 – 10.78.181.141	10.78.181.141
200	10.78.181.142/31	10.78.181.142 – 10.78.181.143	10.78.181.143
201	10.78.181.144/31	10.78.181.144 – 10.78.181.145	10.78.181.145
202	10.78.181.146/31	10.78.181.146 – 10.78.181.147	10.78.181.147
203	10.78.181.148/31	10.78.181.148 – 10.78.181.149	10.78.181.149
204	10.78.181.150/31	10.78.181.150 – 10.78.181.151	10.78.181.151
205	10.78.181.152/31	10.78.181.152 – 10.78.181.153	10.78.181.153
206	10.78.181.154/31	10.78.181.154 – 10.78.181.155	10.78.181.155
207	10.78.181.156/31	10.78.181.156 – 10.78.181.157	10.78.181.157
208	10.78.181.158/31	10.78.181.158 – 10.78.181.159	10.78.181.159
209	10.78.181.160/31	10.78.181.160 – 10.78.181.161	10.78.181.161
210	10.78.181.162/31	10.78.181.162 – 10.78.181.163	10.78.181.163
211	10.78.181.164/31	10.78.181.164 – 10.78.181.165	10.78.181.165
212	10.78.181.166/31	10.78.181.166 – 10.78.181.167	10.78.181.167
213	10.78.181.168/31	10.78.181.168 – 10.78.181.169	10.78.181.169
214	10.78.181.170/31	10.78.181.170 – 10.78.181.171	10.78.181.171
215	10.78.181.172/31	10.78.181.172 – 10.78.181.173	10.78.181.173
216	10.78.181.174/31	10.78.181.174 – 10.78.181.175	10.78.181.175
217	10.78.181.176/31	10.78.181.176 – 10.78.181.177	10.78.181.177
218	10.78.181.178/31	10.78.181.178 – 10.78.181.179	10.78.181.179
219	10.78.181.180/31	10.78.181.180 – 10.78.181.181	10.78.181.181
220	10.78.181.182/31	10.78.181.182 – 10.78.181.183	10.78.181.183
221	10.78.181.184/31	10.78.181.184 – 10.78.181.185	10.78.181.185
222	10.78.181.186/31	10.78.181.186 – 10.78.181.187	10.78.181.187
223	10.78.181.188/31	10.78.181.188 – 10.78.181.189	10.78.181.189
224	10.78.181.190/31	10.78.181.190 – 10.78.181.191	10.78.181.191
225	10.78.181.192/31	10.78.181.192 – 10.78.181.193	10.78.181.193
226	10.78.181.194/31	10.78.181.194 – 10.78.181.195	10.78.181.195
227	10.78.181.196/31	10.78.181.196 – 10.78.181.197	10.78.181.197
228	10.78.181.198/31	10.78.181.198 – 10.78.181.199	10.78.181.199
229	10.78.181.200/31	10.78.181.200 – 10.78.181.201	10.78.181.201
230	10.78.181.202/31	10.78.181.202 – 10.78.181.203	10.78.181.203
231	10.78.181.204/31	10.78.181.204 – 10.78.181.205	10.78.181.205
232	10.78.181.206/31	10.78.181.206 – 10.78.181.207	10.78.181.207
233	10.78.181.208/31	10.78.181.208 – 10.78.181.209	10.78.181.209
234	10.78.181.210/31	10.78.181.210 – 10.78.181.211	10.78.181.211
235	10.78.181.212/31	10.78.181.212 – 10.78.181.213	10.78.181.213
236	10.78.181.214/31	10.78.181.214 – 10.78.181.215	10.78.181.215
237	10.78.181.216/31	10.78.181.216 – 10.78.181.217	10.78.181.217
238	10.78.181.218/31	10.78.181.218 – 10.78.181.219	10.78.181.219
239	10.78.181.220/31	10.78.181.220 – 10.78.181.221	10.78.181.221
240	10.78.181.222/31	10.78.181.222 – 10.78.181.223	10.78.181.223
241	10.78.181.224/31	10.78.181.224 – 10.78.181.225	10.78.181.225
242	10.78.181.226/31	10.78.181.226 – 10.78.181.227	10.78.181.227
243	10.78.181.228/31	10.78.181.228 – 10.78.181.229	10.78.181.229
244	10.78.181.230/31	10.78.181.230 – 10.78.181.231	10.78.181.231
245	10.78.181.232/31	10.78.181.232 – 10.78.181.233	10.78.181.233
246	10.78.181.234/31	10.78.181.234 – 10.78.181.235	10.78.181.235
247	10.78.181.236/31	10.78.181.236 – 10.78.181.237	10.78.181.237
248	10.78.181.238/31	10.78.181.238 – 10.78.181.239	10.78.181.239
249	10.78.181.240/31	10.78.181.240 – 10.78.181.241	10.78.181.241
250	10.78.181.242/31	10.78.181.242 – 10.78.181.243	10.78.181.243
251	10.78.181.244/31	10.78.181.244 – 10.78.181.245	10.78.181.245
252	10.78.181.246/31	10.78.181.246 – 10.78.181.247	10.78.181.247
253	10.78.181.248/31	10.78.181.248 – 10.78.181.249	10.78.181.249
254	10.78.181.250/31	10.78.181.250 – 10.78.181.251	10.78.181.251
255	10.78.181.252/31	10.78.181.252 – 10.78.181.253	10.78.181.253
256	10.78.181.254/31	10.78.181.254 – 10.78.181.255	10.78.181.255

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 →