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)10.78.102.0/23

network10.78.102.0/23

broadcast10.78.103.255

first host10.78.102.1

last host10.78.103.254

subnet mask255.255.254.0

wildcard0.0.1.255

addresses512

usable hosts510

classA

ipcalc 10.78.102.0/23

address00001010.01001110.01100110.00000000

subnet mask11111111.11111111.11111110.00000000

network00001010.01001110.01100110.00000000

broadcast00001010.01001110.01100111.11111111

green = network part, grey = host part

hex0x0a4e6600

decimal172910080

reverse dns0.102.78.10.in-addr.arpa

ipv4-mapped::ffff:a4e:6600

/23 split into /31 · 256 subnets

close ×

#	network	host range	broadcast
1	10.78.102.0/31	10.78.102.0 – 10.78.102.1	10.78.102.1
2	10.78.102.2/31	10.78.102.2 – 10.78.102.3	10.78.102.3
3	10.78.102.4/31	10.78.102.4 – 10.78.102.5	10.78.102.5
4	10.78.102.6/31	10.78.102.6 – 10.78.102.7	10.78.102.7
5	10.78.102.8/31	10.78.102.8 – 10.78.102.9	10.78.102.9
6	10.78.102.10/31	10.78.102.10 – 10.78.102.11	10.78.102.11
7	10.78.102.12/31	10.78.102.12 – 10.78.102.13	10.78.102.13
8	10.78.102.14/31	10.78.102.14 – 10.78.102.15	10.78.102.15
9	10.78.102.16/31	10.78.102.16 – 10.78.102.17	10.78.102.17
10	10.78.102.18/31	10.78.102.18 – 10.78.102.19	10.78.102.19
11	10.78.102.20/31	10.78.102.20 – 10.78.102.21	10.78.102.21
12	10.78.102.22/31	10.78.102.22 – 10.78.102.23	10.78.102.23
13	10.78.102.24/31	10.78.102.24 – 10.78.102.25	10.78.102.25
14	10.78.102.26/31	10.78.102.26 – 10.78.102.27	10.78.102.27
15	10.78.102.28/31	10.78.102.28 – 10.78.102.29	10.78.102.29
16	10.78.102.30/31	10.78.102.30 – 10.78.102.31	10.78.102.31
17	10.78.102.32/31	10.78.102.32 – 10.78.102.33	10.78.102.33
18	10.78.102.34/31	10.78.102.34 – 10.78.102.35	10.78.102.35
19	10.78.102.36/31	10.78.102.36 – 10.78.102.37	10.78.102.37
20	10.78.102.38/31	10.78.102.38 – 10.78.102.39	10.78.102.39
21	10.78.102.40/31	10.78.102.40 – 10.78.102.41	10.78.102.41
22	10.78.102.42/31	10.78.102.42 – 10.78.102.43	10.78.102.43
23	10.78.102.44/31	10.78.102.44 – 10.78.102.45	10.78.102.45
24	10.78.102.46/31	10.78.102.46 – 10.78.102.47	10.78.102.47
25	10.78.102.48/31	10.78.102.48 – 10.78.102.49	10.78.102.49
26	10.78.102.50/31	10.78.102.50 – 10.78.102.51	10.78.102.51
27	10.78.102.52/31	10.78.102.52 – 10.78.102.53	10.78.102.53
28	10.78.102.54/31	10.78.102.54 – 10.78.102.55	10.78.102.55
29	10.78.102.56/31	10.78.102.56 – 10.78.102.57	10.78.102.57
30	10.78.102.58/31	10.78.102.58 – 10.78.102.59	10.78.102.59
31	10.78.102.60/31	10.78.102.60 – 10.78.102.61	10.78.102.61
32	10.78.102.62/31	10.78.102.62 – 10.78.102.63	10.78.102.63
33	10.78.102.64/31	10.78.102.64 – 10.78.102.65	10.78.102.65
34	10.78.102.66/31	10.78.102.66 – 10.78.102.67	10.78.102.67
35	10.78.102.68/31	10.78.102.68 – 10.78.102.69	10.78.102.69
36	10.78.102.70/31	10.78.102.70 – 10.78.102.71	10.78.102.71
37	10.78.102.72/31	10.78.102.72 – 10.78.102.73	10.78.102.73
38	10.78.102.74/31	10.78.102.74 – 10.78.102.75	10.78.102.75
39	10.78.102.76/31	10.78.102.76 – 10.78.102.77	10.78.102.77
40	10.78.102.78/31	10.78.102.78 – 10.78.102.79	10.78.102.79
41	10.78.102.80/31	10.78.102.80 – 10.78.102.81	10.78.102.81
42	10.78.102.82/31	10.78.102.82 – 10.78.102.83	10.78.102.83
43	10.78.102.84/31	10.78.102.84 – 10.78.102.85	10.78.102.85
44	10.78.102.86/31	10.78.102.86 – 10.78.102.87	10.78.102.87
45	10.78.102.88/31	10.78.102.88 – 10.78.102.89	10.78.102.89
46	10.78.102.90/31	10.78.102.90 – 10.78.102.91	10.78.102.91
47	10.78.102.92/31	10.78.102.92 – 10.78.102.93	10.78.102.93
48	10.78.102.94/31	10.78.102.94 – 10.78.102.95	10.78.102.95
49	10.78.102.96/31	10.78.102.96 – 10.78.102.97	10.78.102.97
50	10.78.102.98/31	10.78.102.98 – 10.78.102.99	10.78.102.99
51	10.78.102.100/31	10.78.102.100 – 10.78.102.101	10.78.102.101
52	10.78.102.102/31	10.78.102.102 – 10.78.102.103	10.78.102.103
53	10.78.102.104/31	10.78.102.104 – 10.78.102.105	10.78.102.105
54	10.78.102.106/31	10.78.102.106 – 10.78.102.107	10.78.102.107
55	10.78.102.108/31	10.78.102.108 – 10.78.102.109	10.78.102.109
56	10.78.102.110/31	10.78.102.110 – 10.78.102.111	10.78.102.111
57	10.78.102.112/31	10.78.102.112 – 10.78.102.113	10.78.102.113
58	10.78.102.114/31	10.78.102.114 – 10.78.102.115	10.78.102.115
59	10.78.102.116/31	10.78.102.116 – 10.78.102.117	10.78.102.117
60	10.78.102.118/31	10.78.102.118 – 10.78.102.119	10.78.102.119
61	10.78.102.120/31	10.78.102.120 – 10.78.102.121	10.78.102.121
62	10.78.102.122/31	10.78.102.122 – 10.78.102.123	10.78.102.123
63	10.78.102.124/31	10.78.102.124 – 10.78.102.125	10.78.102.125
64	10.78.102.126/31	10.78.102.126 – 10.78.102.127	10.78.102.127
65	10.78.102.128/31	10.78.102.128 – 10.78.102.129	10.78.102.129
66	10.78.102.130/31	10.78.102.130 – 10.78.102.131	10.78.102.131
67	10.78.102.132/31	10.78.102.132 – 10.78.102.133	10.78.102.133
68	10.78.102.134/31	10.78.102.134 – 10.78.102.135	10.78.102.135
69	10.78.102.136/31	10.78.102.136 – 10.78.102.137	10.78.102.137
70	10.78.102.138/31	10.78.102.138 – 10.78.102.139	10.78.102.139
71	10.78.102.140/31	10.78.102.140 – 10.78.102.141	10.78.102.141
72	10.78.102.142/31	10.78.102.142 – 10.78.102.143	10.78.102.143
73	10.78.102.144/31	10.78.102.144 – 10.78.102.145	10.78.102.145
74	10.78.102.146/31	10.78.102.146 – 10.78.102.147	10.78.102.147
75	10.78.102.148/31	10.78.102.148 – 10.78.102.149	10.78.102.149
76	10.78.102.150/31	10.78.102.150 – 10.78.102.151	10.78.102.151
77	10.78.102.152/31	10.78.102.152 – 10.78.102.153	10.78.102.153
78	10.78.102.154/31	10.78.102.154 – 10.78.102.155	10.78.102.155
79	10.78.102.156/31	10.78.102.156 – 10.78.102.157	10.78.102.157
80	10.78.102.158/31	10.78.102.158 – 10.78.102.159	10.78.102.159
81	10.78.102.160/31	10.78.102.160 – 10.78.102.161	10.78.102.161
82	10.78.102.162/31	10.78.102.162 – 10.78.102.163	10.78.102.163
83	10.78.102.164/31	10.78.102.164 – 10.78.102.165	10.78.102.165
84	10.78.102.166/31	10.78.102.166 – 10.78.102.167	10.78.102.167
85	10.78.102.168/31	10.78.102.168 – 10.78.102.169	10.78.102.169
86	10.78.102.170/31	10.78.102.170 – 10.78.102.171	10.78.102.171
87	10.78.102.172/31	10.78.102.172 – 10.78.102.173	10.78.102.173
88	10.78.102.174/31	10.78.102.174 – 10.78.102.175	10.78.102.175
89	10.78.102.176/31	10.78.102.176 – 10.78.102.177	10.78.102.177
90	10.78.102.178/31	10.78.102.178 – 10.78.102.179	10.78.102.179
91	10.78.102.180/31	10.78.102.180 – 10.78.102.181	10.78.102.181
92	10.78.102.182/31	10.78.102.182 – 10.78.102.183	10.78.102.183
93	10.78.102.184/31	10.78.102.184 – 10.78.102.185	10.78.102.185
94	10.78.102.186/31	10.78.102.186 – 10.78.102.187	10.78.102.187
95	10.78.102.188/31	10.78.102.188 – 10.78.102.189	10.78.102.189
96	10.78.102.190/31	10.78.102.190 – 10.78.102.191	10.78.102.191
97	10.78.102.192/31	10.78.102.192 – 10.78.102.193	10.78.102.193
98	10.78.102.194/31	10.78.102.194 – 10.78.102.195	10.78.102.195
99	10.78.102.196/31	10.78.102.196 – 10.78.102.197	10.78.102.197
100	10.78.102.198/31	10.78.102.198 – 10.78.102.199	10.78.102.199
101	10.78.102.200/31	10.78.102.200 – 10.78.102.201	10.78.102.201
102	10.78.102.202/31	10.78.102.202 – 10.78.102.203	10.78.102.203
103	10.78.102.204/31	10.78.102.204 – 10.78.102.205	10.78.102.205
104	10.78.102.206/31	10.78.102.206 – 10.78.102.207	10.78.102.207
105	10.78.102.208/31	10.78.102.208 – 10.78.102.209	10.78.102.209
106	10.78.102.210/31	10.78.102.210 – 10.78.102.211	10.78.102.211
107	10.78.102.212/31	10.78.102.212 – 10.78.102.213	10.78.102.213
108	10.78.102.214/31	10.78.102.214 – 10.78.102.215	10.78.102.215
109	10.78.102.216/31	10.78.102.216 – 10.78.102.217	10.78.102.217
110	10.78.102.218/31	10.78.102.218 – 10.78.102.219	10.78.102.219
111	10.78.102.220/31	10.78.102.220 – 10.78.102.221	10.78.102.221
112	10.78.102.222/31	10.78.102.222 – 10.78.102.223	10.78.102.223
113	10.78.102.224/31	10.78.102.224 – 10.78.102.225	10.78.102.225
114	10.78.102.226/31	10.78.102.226 – 10.78.102.227	10.78.102.227
115	10.78.102.228/31	10.78.102.228 – 10.78.102.229	10.78.102.229
116	10.78.102.230/31	10.78.102.230 – 10.78.102.231	10.78.102.231
117	10.78.102.232/31	10.78.102.232 – 10.78.102.233	10.78.102.233
118	10.78.102.234/31	10.78.102.234 – 10.78.102.235	10.78.102.235
119	10.78.102.236/31	10.78.102.236 – 10.78.102.237	10.78.102.237
120	10.78.102.238/31	10.78.102.238 – 10.78.102.239	10.78.102.239
121	10.78.102.240/31	10.78.102.240 – 10.78.102.241	10.78.102.241
122	10.78.102.242/31	10.78.102.242 – 10.78.102.243	10.78.102.243
123	10.78.102.244/31	10.78.102.244 – 10.78.102.245	10.78.102.245
124	10.78.102.246/31	10.78.102.246 – 10.78.102.247	10.78.102.247
125	10.78.102.248/31	10.78.102.248 – 10.78.102.249	10.78.102.249
126	10.78.102.250/31	10.78.102.250 – 10.78.102.251	10.78.102.251
127	10.78.102.252/31	10.78.102.252 – 10.78.102.253	10.78.102.253
128	10.78.102.254/31	10.78.102.254 – 10.78.102.255	10.78.102.255
129	10.78.103.0/31	10.78.103.0 – 10.78.103.1	10.78.103.1
130	10.78.103.2/31	10.78.103.2 – 10.78.103.3	10.78.103.3
131	10.78.103.4/31	10.78.103.4 – 10.78.103.5	10.78.103.5
132	10.78.103.6/31	10.78.103.6 – 10.78.103.7	10.78.103.7
133	10.78.103.8/31	10.78.103.8 – 10.78.103.9	10.78.103.9
134	10.78.103.10/31	10.78.103.10 – 10.78.103.11	10.78.103.11
135	10.78.103.12/31	10.78.103.12 – 10.78.103.13	10.78.103.13
136	10.78.103.14/31	10.78.103.14 – 10.78.103.15	10.78.103.15
137	10.78.103.16/31	10.78.103.16 – 10.78.103.17	10.78.103.17
138	10.78.103.18/31	10.78.103.18 – 10.78.103.19	10.78.103.19
139	10.78.103.20/31	10.78.103.20 – 10.78.103.21	10.78.103.21
140	10.78.103.22/31	10.78.103.22 – 10.78.103.23	10.78.103.23
141	10.78.103.24/31	10.78.103.24 – 10.78.103.25	10.78.103.25
142	10.78.103.26/31	10.78.103.26 – 10.78.103.27	10.78.103.27
143	10.78.103.28/31	10.78.103.28 – 10.78.103.29	10.78.103.29
144	10.78.103.30/31	10.78.103.30 – 10.78.103.31	10.78.103.31
145	10.78.103.32/31	10.78.103.32 – 10.78.103.33	10.78.103.33
146	10.78.103.34/31	10.78.103.34 – 10.78.103.35	10.78.103.35
147	10.78.103.36/31	10.78.103.36 – 10.78.103.37	10.78.103.37
148	10.78.103.38/31	10.78.103.38 – 10.78.103.39	10.78.103.39
149	10.78.103.40/31	10.78.103.40 – 10.78.103.41	10.78.103.41
150	10.78.103.42/31	10.78.103.42 – 10.78.103.43	10.78.103.43
151	10.78.103.44/31	10.78.103.44 – 10.78.103.45	10.78.103.45
152	10.78.103.46/31	10.78.103.46 – 10.78.103.47	10.78.103.47
153	10.78.103.48/31	10.78.103.48 – 10.78.103.49	10.78.103.49
154	10.78.103.50/31	10.78.103.50 – 10.78.103.51	10.78.103.51
155	10.78.103.52/31	10.78.103.52 – 10.78.103.53	10.78.103.53
156	10.78.103.54/31	10.78.103.54 – 10.78.103.55	10.78.103.55
157	10.78.103.56/31	10.78.103.56 – 10.78.103.57	10.78.103.57
158	10.78.103.58/31	10.78.103.58 – 10.78.103.59	10.78.103.59
159	10.78.103.60/31	10.78.103.60 – 10.78.103.61	10.78.103.61
160	10.78.103.62/31	10.78.103.62 – 10.78.103.63	10.78.103.63
161	10.78.103.64/31	10.78.103.64 – 10.78.103.65	10.78.103.65
162	10.78.103.66/31	10.78.103.66 – 10.78.103.67	10.78.103.67
163	10.78.103.68/31	10.78.103.68 – 10.78.103.69	10.78.103.69
164	10.78.103.70/31	10.78.103.70 – 10.78.103.71	10.78.103.71
165	10.78.103.72/31	10.78.103.72 – 10.78.103.73	10.78.103.73
166	10.78.103.74/31	10.78.103.74 – 10.78.103.75	10.78.103.75
167	10.78.103.76/31	10.78.103.76 – 10.78.103.77	10.78.103.77
168	10.78.103.78/31	10.78.103.78 – 10.78.103.79	10.78.103.79
169	10.78.103.80/31	10.78.103.80 – 10.78.103.81	10.78.103.81
170	10.78.103.82/31	10.78.103.82 – 10.78.103.83	10.78.103.83
171	10.78.103.84/31	10.78.103.84 – 10.78.103.85	10.78.103.85
172	10.78.103.86/31	10.78.103.86 – 10.78.103.87	10.78.103.87
173	10.78.103.88/31	10.78.103.88 – 10.78.103.89	10.78.103.89
174	10.78.103.90/31	10.78.103.90 – 10.78.103.91	10.78.103.91
175	10.78.103.92/31	10.78.103.92 – 10.78.103.93	10.78.103.93
176	10.78.103.94/31	10.78.103.94 – 10.78.103.95	10.78.103.95
177	10.78.103.96/31	10.78.103.96 – 10.78.103.97	10.78.103.97
178	10.78.103.98/31	10.78.103.98 – 10.78.103.99	10.78.103.99
179	10.78.103.100/31	10.78.103.100 – 10.78.103.101	10.78.103.101
180	10.78.103.102/31	10.78.103.102 – 10.78.103.103	10.78.103.103
181	10.78.103.104/31	10.78.103.104 – 10.78.103.105	10.78.103.105
182	10.78.103.106/31	10.78.103.106 – 10.78.103.107	10.78.103.107
183	10.78.103.108/31	10.78.103.108 – 10.78.103.109	10.78.103.109
184	10.78.103.110/31	10.78.103.110 – 10.78.103.111	10.78.103.111
185	10.78.103.112/31	10.78.103.112 – 10.78.103.113	10.78.103.113
186	10.78.103.114/31	10.78.103.114 – 10.78.103.115	10.78.103.115
187	10.78.103.116/31	10.78.103.116 – 10.78.103.117	10.78.103.117
188	10.78.103.118/31	10.78.103.118 – 10.78.103.119	10.78.103.119
189	10.78.103.120/31	10.78.103.120 – 10.78.103.121	10.78.103.121
190	10.78.103.122/31	10.78.103.122 – 10.78.103.123	10.78.103.123
191	10.78.103.124/31	10.78.103.124 – 10.78.103.125	10.78.103.125
192	10.78.103.126/31	10.78.103.126 – 10.78.103.127	10.78.103.127
193	10.78.103.128/31	10.78.103.128 – 10.78.103.129	10.78.103.129
194	10.78.103.130/31	10.78.103.130 – 10.78.103.131	10.78.103.131
195	10.78.103.132/31	10.78.103.132 – 10.78.103.133	10.78.103.133
196	10.78.103.134/31	10.78.103.134 – 10.78.103.135	10.78.103.135
197	10.78.103.136/31	10.78.103.136 – 10.78.103.137	10.78.103.137
198	10.78.103.138/31	10.78.103.138 – 10.78.103.139	10.78.103.139
199	10.78.103.140/31	10.78.103.140 – 10.78.103.141	10.78.103.141
200	10.78.103.142/31	10.78.103.142 – 10.78.103.143	10.78.103.143
201	10.78.103.144/31	10.78.103.144 – 10.78.103.145	10.78.103.145
202	10.78.103.146/31	10.78.103.146 – 10.78.103.147	10.78.103.147
203	10.78.103.148/31	10.78.103.148 – 10.78.103.149	10.78.103.149
204	10.78.103.150/31	10.78.103.150 – 10.78.103.151	10.78.103.151
205	10.78.103.152/31	10.78.103.152 – 10.78.103.153	10.78.103.153
206	10.78.103.154/31	10.78.103.154 – 10.78.103.155	10.78.103.155
207	10.78.103.156/31	10.78.103.156 – 10.78.103.157	10.78.103.157
208	10.78.103.158/31	10.78.103.158 – 10.78.103.159	10.78.103.159
209	10.78.103.160/31	10.78.103.160 – 10.78.103.161	10.78.103.161
210	10.78.103.162/31	10.78.103.162 – 10.78.103.163	10.78.103.163
211	10.78.103.164/31	10.78.103.164 – 10.78.103.165	10.78.103.165
212	10.78.103.166/31	10.78.103.166 – 10.78.103.167	10.78.103.167
213	10.78.103.168/31	10.78.103.168 – 10.78.103.169	10.78.103.169
214	10.78.103.170/31	10.78.103.170 – 10.78.103.171	10.78.103.171
215	10.78.103.172/31	10.78.103.172 – 10.78.103.173	10.78.103.173
216	10.78.103.174/31	10.78.103.174 – 10.78.103.175	10.78.103.175
217	10.78.103.176/31	10.78.103.176 – 10.78.103.177	10.78.103.177
218	10.78.103.178/31	10.78.103.178 – 10.78.103.179	10.78.103.179
219	10.78.103.180/31	10.78.103.180 – 10.78.103.181	10.78.103.181
220	10.78.103.182/31	10.78.103.182 – 10.78.103.183	10.78.103.183
221	10.78.103.184/31	10.78.103.184 – 10.78.103.185	10.78.103.185
222	10.78.103.186/31	10.78.103.186 – 10.78.103.187	10.78.103.187
223	10.78.103.188/31	10.78.103.188 – 10.78.103.189	10.78.103.189
224	10.78.103.190/31	10.78.103.190 – 10.78.103.191	10.78.103.191
225	10.78.103.192/31	10.78.103.192 – 10.78.103.193	10.78.103.193
226	10.78.103.194/31	10.78.103.194 – 10.78.103.195	10.78.103.195
227	10.78.103.196/31	10.78.103.196 – 10.78.103.197	10.78.103.197
228	10.78.103.198/31	10.78.103.198 – 10.78.103.199	10.78.103.199
229	10.78.103.200/31	10.78.103.200 – 10.78.103.201	10.78.103.201
230	10.78.103.202/31	10.78.103.202 – 10.78.103.203	10.78.103.203
231	10.78.103.204/31	10.78.103.204 – 10.78.103.205	10.78.103.205
232	10.78.103.206/31	10.78.103.206 – 10.78.103.207	10.78.103.207
233	10.78.103.208/31	10.78.103.208 – 10.78.103.209	10.78.103.209
234	10.78.103.210/31	10.78.103.210 – 10.78.103.211	10.78.103.211
235	10.78.103.212/31	10.78.103.212 – 10.78.103.213	10.78.103.213
236	10.78.103.214/31	10.78.103.214 – 10.78.103.215	10.78.103.215
237	10.78.103.216/31	10.78.103.216 – 10.78.103.217	10.78.103.217
238	10.78.103.218/31	10.78.103.218 – 10.78.103.219	10.78.103.219
239	10.78.103.220/31	10.78.103.220 – 10.78.103.221	10.78.103.221
240	10.78.103.222/31	10.78.103.222 – 10.78.103.223	10.78.103.223
241	10.78.103.224/31	10.78.103.224 – 10.78.103.225	10.78.103.225
242	10.78.103.226/31	10.78.103.226 – 10.78.103.227	10.78.103.227
243	10.78.103.228/31	10.78.103.228 – 10.78.103.229	10.78.103.229
244	10.78.103.230/31	10.78.103.230 – 10.78.103.231	10.78.103.231
245	10.78.103.232/31	10.78.103.232 – 10.78.103.233	10.78.103.233
246	10.78.103.234/31	10.78.103.234 – 10.78.103.235	10.78.103.235
247	10.78.103.236/31	10.78.103.236 – 10.78.103.237	10.78.103.237
248	10.78.103.238/31	10.78.103.238 – 10.78.103.239	10.78.103.239
249	10.78.103.240/31	10.78.103.240 – 10.78.103.241	10.78.103.241
250	10.78.103.242/31	10.78.103.242 – 10.78.103.243	10.78.103.243
251	10.78.103.244/31	10.78.103.244 – 10.78.103.245	10.78.103.245
252	10.78.103.246/31	10.78.103.246 – 10.78.103.247	10.78.103.247
253	10.78.103.248/31	10.78.103.248 – 10.78.103.249	10.78.103.249
254	10.78.103.250/31	10.78.103.250 – 10.78.103.251	10.78.103.251
255	10.78.103.252/31	10.78.103.252 – 10.78.103.253	10.78.103.253
256	10.78.103.254/31	10.78.103.254 – 10.78.103.255	10.78.103.255

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 →