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)10.2.178.0/23

network10.2.178.0/23

broadcast10.2.179.255

first host10.2.178.1

last host10.2.179.254

subnet mask255.255.254.0

wildcard0.0.1.255

addresses512

usable hosts510

classA

ipcalc 10.2.178.0/23

address00001010.00000010.10110010.00000000

subnet mask11111111.11111111.11111110.00000000

network00001010.00000010.10110010.00000000

broadcast00001010.00000010.10110011.11111111

green = network part, grey = host part

hex0x0a02b200

decimal167948800

reverse dns0.178.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:b200

/23 split into /31 · 256 subnets

close ×

#	network	host range	broadcast
1	10.2.178.0/31	10.2.178.0 – 10.2.178.1	10.2.178.1
2	10.2.178.2/31	10.2.178.2 – 10.2.178.3	10.2.178.3
3	10.2.178.4/31	10.2.178.4 – 10.2.178.5	10.2.178.5
4	10.2.178.6/31	10.2.178.6 – 10.2.178.7	10.2.178.7
5	10.2.178.8/31	10.2.178.8 – 10.2.178.9	10.2.178.9
6	10.2.178.10/31	10.2.178.10 – 10.2.178.11	10.2.178.11
7	10.2.178.12/31	10.2.178.12 – 10.2.178.13	10.2.178.13
8	10.2.178.14/31	10.2.178.14 – 10.2.178.15	10.2.178.15
9	10.2.178.16/31	10.2.178.16 – 10.2.178.17	10.2.178.17
10	10.2.178.18/31	10.2.178.18 – 10.2.178.19	10.2.178.19
11	10.2.178.20/31	10.2.178.20 – 10.2.178.21	10.2.178.21
12	10.2.178.22/31	10.2.178.22 – 10.2.178.23	10.2.178.23
13	10.2.178.24/31	10.2.178.24 – 10.2.178.25	10.2.178.25
14	10.2.178.26/31	10.2.178.26 – 10.2.178.27	10.2.178.27
15	10.2.178.28/31	10.2.178.28 – 10.2.178.29	10.2.178.29
16	10.2.178.30/31	10.2.178.30 – 10.2.178.31	10.2.178.31
17	10.2.178.32/31	10.2.178.32 – 10.2.178.33	10.2.178.33
18	10.2.178.34/31	10.2.178.34 – 10.2.178.35	10.2.178.35
19	10.2.178.36/31	10.2.178.36 – 10.2.178.37	10.2.178.37
20	10.2.178.38/31	10.2.178.38 – 10.2.178.39	10.2.178.39
21	10.2.178.40/31	10.2.178.40 – 10.2.178.41	10.2.178.41
22	10.2.178.42/31	10.2.178.42 – 10.2.178.43	10.2.178.43
23	10.2.178.44/31	10.2.178.44 – 10.2.178.45	10.2.178.45
24	10.2.178.46/31	10.2.178.46 – 10.2.178.47	10.2.178.47
25	10.2.178.48/31	10.2.178.48 – 10.2.178.49	10.2.178.49
26	10.2.178.50/31	10.2.178.50 – 10.2.178.51	10.2.178.51
27	10.2.178.52/31	10.2.178.52 – 10.2.178.53	10.2.178.53
28	10.2.178.54/31	10.2.178.54 – 10.2.178.55	10.2.178.55
29	10.2.178.56/31	10.2.178.56 – 10.2.178.57	10.2.178.57
30	10.2.178.58/31	10.2.178.58 – 10.2.178.59	10.2.178.59
31	10.2.178.60/31	10.2.178.60 – 10.2.178.61	10.2.178.61
32	10.2.178.62/31	10.2.178.62 – 10.2.178.63	10.2.178.63
33	10.2.178.64/31	10.2.178.64 – 10.2.178.65	10.2.178.65
34	10.2.178.66/31	10.2.178.66 – 10.2.178.67	10.2.178.67
35	10.2.178.68/31	10.2.178.68 – 10.2.178.69	10.2.178.69
36	10.2.178.70/31	10.2.178.70 – 10.2.178.71	10.2.178.71
37	10.2.178.72/31	10.2.178.72 – 10.2.178.73	10.2.178.73
38	10.2.178.74/31	10.2.178.74 – 10.2.178.75	10.2.178.75
39	10.2.178.76/31	10.2.178.76 – 10.2.178.77	10.2.178.77
40	10.2.178.78/31	10.2.178.78 – 10.2.178.79	10.2.178.79
41	10.2.178.80/31	10.2.178.80 – 10.2.178.81	10.2.178.81
42	10.2.178.82/31	10.2.178.82 – 10.2.178.83	10.2.178.83
43	10.2.178.84/31	10.2.178.84 – 10.2.178.85	10.2.178.85
44	10.2.178.86/31	10.2.178.86 – 10.2.178.87	10.2.178.87
45	10.2.178.88/31	10.2.178.88 – 10.2.178.89	10.2.178.89
46	10.2.178.90/31	10.2.178.90 – 10.2.178.91	10.2.178.91
47	10.2.178.92/31	10.2.178.92 – 10.2.178.93	10.2.178.93
48	10.2.178.94/31	10.2.178.94 – 10.2.178.95	10.2.178.95
49	10.2.178.96/31	10.2.178.96 – 10.2.178.97	10.2.178.97
50	10.2.178.98/31	10.2.178.98 – 10.2.178.99	10.2.178.99
51	10.2.178.100/31	10.2.178.100 – 10.2.178.101	10.2.178.101
52	10.2.178.102/31	10.2.178.102 – 10.2.178.103	10.2.178.103
53	10.2.178.104/31	10.2.178.104 – 10.2.178.105	10.2.178.105
54	10.2.178.106/31	10.2.178.106 – 10.2.178.107	10.2.178.107
55	10.2.178.108/31	10.2.178.108 – 10.2.178.109	10.2.178.109
56	10.2.178.110/31	10.2.178.110 – 10.2.178.111	10.2.178.111
57	10.2.178.112/31	10.2.178.112 – 10.2.178.113	10.2.178.113
58	10.2.178.114/31	10.2.178.114 – 10.2.178.115	10.2.178.115
59	10.2.178.116/31	10.2.178.116 – 10.2.178.117	10.2.178.117
60	10.2.178.118/31	10.2.178.118 – 10.2.178.119	10.2.178.119
61	10.2.178.120/31	10.2.178.120 – 10.2.178.121	10.2.178.121
62	10.2.178.122/31	10.2.178.122 – 10.2.178.123	10.2.178.123
63	10.2.178.124/31	10.2.178.124 – 10.2.178.125	10.2.178.125
64	10.2.178.126/31	10.2.178.126 – 10.2.178.127	10.2.178.127
65	10.2.178.128/31	10.2.178.128 – 10.2.178.129	10.2.178.129
66	10.2.178.130/31	10.2.178.130 – 10.2.178.131	10.2.178.131
67	10.2.178.132/31	10.2.178.132 – 10.2.178.133	10.2.178.133
68	10.2.178.134/31	10.2.178.134 – 10.2.178.135	10.2.178.135
69	10.2.178.136/31	10.2.178.136 – 10.2.178.137	10.2.178.137
70	10.2.178.138/31	10.2.178.138 – 10.2.178.139	10.2.178.139
71	10.2.178.140/31	10.2.178.140 – 10.2.178.141	10.2.178.141
72	10.2.178.142/31	10.2.178.142 – 10.2.178.143	10.2.178.143
73	10.2.178.144/31	10.2.178.144 – 10.2.178.145	10.2.178.145
74	10.2.178.146/31	10.2.178.146 – 10.2.178.147	10.2.178.147
75	10.2.178.148/31	10.2.178.148 – 10.2.178.149	10.2.178.149
76	10.2.178.150/31	10.2.178.150 – 10.2.178.151	10.2.178.151
77	10.2.178.152/31	10.2.178.152 – 10.2.178.153	10.2.178.153
78	10.2.178.154/31	10.2.178.154 – 10.2.178.155	10.2.178.155
79	10.2.178.156/31	10.2.178.156 – 10.2.178.157	10.2.178.157
80	10.2.178.158/31	10.2.178.158 – 10.2.178.159	10.2.178.159
81	10.2.178.160/31	10.2.178.160 – 10.2.178.161	10.2.178.161
82	10.2.178.162/31	10.2.178.162 – 10.2.178.163	10.2.178.163
83	10.2.178.164/31	10.2.178.164 – 10.2.178.165	10.2.178.165
84	10.2.178.166/31	10.2.178.166 – 10.2.178.167	10.2.178.167
85	10.2.178.168/31	10.2.178.168 – 10.2.178.169	10.2.178.169
86	10.2.178.170/31	10.2.178.170 – 10.2.178.171	10.2.178.171
87	10.2.178.172/31	10.2.178.172 – 10.2.178.173	10.2.178.173
88	10.2.178.174/31	10.2.178.174 – 10.2.178.175	10.2.178.175
89	10.2.178.176/31	10.2.178.176 – 10.2.178.177	10.2.178.177
90	10.2.178.178/31	10.2.178.178 – 10.2.178.179	10.2.178.179
91	10.2.178.180/31	10.2.178.180 – 10.2.178.181	10.2.178.181
92	10.2.178.182/31	10.2.178.182 – 10.2.178.183	10.2.178.183
93	10.2.178.184/31	10.2.178.184 – 10.2.178.185	10.2.178.185
94	10.2.178.186/31	10.2.178.186 – 10.2.178.187	10.2.178.187
95	10.2.178.188/31	10.2.178.188 – 10.2.178.189	10.2.178.189
96	10.2.178.190/31	10.2.178.190 – 10.2.178.191	10.2.178.191
97	10.2.178.192/31	10.2.178.192 – 10.2.178.193	10.2.178.193
98	10.2.178.194/31	10.2.178.194 – 10.2.178.195	10.2.178.195
99	10.2.178.196/31	10.2.178.196 – 10.2.178.197	10.2.178.197
100	10.2.178.198/31	10.2.178.198 – 10.2.178.199	10.2.178.199
101	10.2.178.200/31	10.2.178.200 – 10.2.178.201	10.2.178.201
102	10.2.178.202/31	10.2.178.202 – 10.2.178.203	10.2.178.203
103	10.2.178.204/31	10.2.178.204 – 10.2.178.205	10.2.178.205
104	10.2.178.206/31	10.2.178.206 – 10.2.178.207	10.2.178.207
105	10.2.178.208/31	10.2.178.208 – 10.2.178.209	10.2.178.209
106	10.2.178.210/31	10.2.178.210 – 10.2.178.211	10.2.178.211
107	10.2.178.212/31	10.2.178.212 – 10.2.178.213	10.2.178.213
108	10.2.178.214/31	10.2.178.214 – 10.2.178.215	10.2.178.215
109	10.2.178.216/31	10.2.178.216 – 10.2.178.217	10.2.178.217
110	10.2.178.218/31	10.2.178.218 – 10.2.178.219	10.2.178.219
111	10.2.178.220/31	10.2.178.220 – 10.2.178.221	10.2.178.221
112	10.2.178.222/31	10.2.178.222 – 10.2.178.223	10.2.178.223
113	10.2.178.224/31	10.2.178.224 – 10.2.178.225	10.2.178.225
114	10.2.178.226/31	10.2.178.226 – 10.2.178.227	10.2.178.227
115	10.2.178.228/31	10.2.178.228 – 10.2.178.229	10.2.178.229
116	10.2.178.230/31	10.2.178.230 – 10.2.178.231	10.2.178.231
117	10.2.178.232/31	10.2.178.232 – 10.2.178.233	10.2.178.233
118	10.2.178.234/31	10.2.178.234 – 10.2.178.235	10.2.178.235
119	10.2.178.236/31	10.2.178.236 – 10.2.178.237	10.2.178.237
120	10.2.178.238/31	10.2.178.238 – 10.2.178.239	10.2.178.239
121	10.2.178.240/31	10.2.178.240 – 10.2.178.241	10.2.178.241
122	10.2.178.242/31	10.2.178.242 – 10.2.178.243	10.2.178.243
123	10.2.178.244/31	10.2.178.244 – 10.2.178.245	10.2.178.245
124	10.2.178.246/31	10.2.178.246 – 10.2.178.247	10.2.178.247
125	10.2.178.248/31	10.2.178.248 – 10.2.178.249	10.2.178.249
126	10.2.178.250/31	10.2.178.250 – 10.2.178.251	10.2.178.251
127	10.2.178.252/31	10.2.178.252 – 10.2.178.253	10.2.178.253
128	10.2.178.254/31	10.2.178.254 – 10.2.178.255	10.2.178.255
129	10.2.179.0/31	10.2.179.0 – 10.2.179.1	10.2.179.1
130	10.2.179.2/31	10.2.179.2 – 10.2.179.3	10.2.179.3
131	10.2.179.4/31	10.2.179.4 – 10.2.179.5	10.2.179.5
132	10.2.179.6/31	10.2.179.6 – 10.2.179.7	10.2.179.7
133	10.2.179.8/31	10.2.179.8 – 10.2.179.9	10.2.179.9
134	10.2.179.10/31	10.2.179.10 – 10.2.179.11	10.2.179.11
135	10.2.179.12/31	10.2.179.12 – 10.2.179.13	10.2.179.13
136	10.2.179.14/31	10.2.179.14 – 10.2.179.15	10.2.179.15
137	10.2.179.16/31	10.2.179.16 – 10.2.179.17	10.2.179.17
138	10.2.179.18/31	10.2.179.18 – 10.2.179.19	10.2.179.19
139	10.2.179.20/31	10.2.179.20 – 10.2.179.21	10.2.179.21
140	10.2.179.22/31	10.2.179.22 – 10.2.179.23	10.2.179.23
141	10.2.179.24/31	10.2.179.24 – 10.2.179.25	10.2.179.25
142	10.2.179.26/31	10.2.179.26 – 10.2.179.27	10.2.179.27
143	10.2.179.28/31	10.2.179.28 – 10.2.179.29	10.2.179.29
144	10.2.179.30/31	10.2.179.30 – 10.2.179.31	10.2.179.31
145	10.2.179.32/31	10.2.179.32 – 10.2.179.33	10.2.179.33
146	10.2.179.34/31	10.2.179.34 – 10.2.179.35	10.2.179.35
147	10.2.179.36/31	10.2.179.36 – 10.2.179.37	10.2.179.37
148	10.2.179.38/31	10.2.179.38 – 10.2.179.39	10.2.179.39
149	10.2.179.40/31	10.2.179.40 – 10.2.179.41	10.2.179.41
150	10.2.179.42/31	10.2.179.42 – 10.2.179.43	10.2.179.43
151	10.2.179.44/31	10.2.179.44 – 10.2.179.45	10.2.179.45
152	10.2.179.46/31	10.2.179.46 – 10.2.179.47	10.2.179.47
153	10.2.179.48/31	10.2.179.48 – 10.2.179.49	10.2.179.49
154	10.2.179.50/31	10.2.179.50 – 10.2.179.51	10.2.179.51
155	10.2.179.52/31	10.2.179.52 – 10.2.179.53	10.2.179.53
156	10.2.179.54/31	10.2.179.54 – 10.2.179.55	10.2.179.55
157	10.2.179.56/31	10.2.179.56 – 10.2.179.57	10.2.179.57
158	10.2.179.58/31	10.2.179.58 – 10.2.179.59	10.2.179.59
159	10.2.179.60/31	10.2.179.60 – 10.2.179.61	10.2.179.61
160	10.2.179.62/31	10.2.179.62 – 10.2.179.63	10.2.179.63
161	10.2.179.64/31	10.2.179.64 – 10.2.179.65	10.2.179.65
162	10.2.179.66/31	10.2.179.66 – 10.2.179.67	10.2.179.67
163	10.2.179.68/31	10.2.179.68 – 10.2.179.69	10.2.179.69
164	10.2.179.70/31	10.2.179.70 – 10.2.179.71	10.2.179.71
165	10.2.179.72/31	10.2.179.72 – 10.2.179.73	10.2.179.73
166	10.2.179.74/31	10.2.179.74 – 10.2.179.75	10.2.179.75
167	10.2.179.76/31	10.2.179.76 – 10.2.179.77	10.2.179.77
168	10.2.179.78/31	10.2.179.78 – 10.2.179.79	10.2.179.79
169	10.2.179.80/31	10.2.179.80 – 10.2.179.81	10.2.179.81
170	10.2.179.82/31	10.2.179.82 – 10.2.179.83	10.2.179.83
171	10.2.179.84/31	10.2.179.84 – 10.2.179.85	10.2.179.85
172	10.2.179.86/31	10.2.179.86 – 10.2.179.87	10.2.179.87
173	10.2.179.88/31	10.2.179.88 – 10.2.179.89	10.2.179.89
174	10.2.179.90/31	10.2.179.90 – 10.2.179.91	10.2.179.91
175	10.2.179.92/31	10.2.179.92 – 10.2.179.93	10.2.179.93
176	10.2.179.94/31	10.2.179.94 – 10.2.179.95	10.2.179.95
177	10.2.179.96/31	10.2.179.96 – 10.2.179.97	10.2.179.97
178	10.2.179.98/31	10.2.179.98 – 10.2.179.99	10.2.179.99
179	10.2.179.100/31	10.2.179.100 – 10.2.179.101	10.2.179.101
180	10.2.179.102/31	10.2.179.102 – 10.2.179.103	10.2.179.103
181	10.2.179.104/31	10.2.179.104 – 10.2.179.105	10.2.179.105
182	10.2.179.106/31	10.2.179.106 – 10.2.179.107	10.2.179.107
183	10.2.179.108/31	10.2.179.108 – 10.2.179.109	10.2.179.109
184	10.2.179.110/31	10.2.179.110 – 10.2.179.111	10.2.179.111
185	10.2.179.112/31	10.2.179.112 – 10.2.179.113	10.2.179.113
186	10.2.179.114/31	10.2.179.114 – 10.2.179.115	10.2.179.115
187	10.2.179.116/31	10.2.179.116 – 10.2.179.117	10.2.179.117
188	10.2.179.118/31	10.2.179.118 – 10.2.179.119	10.2.179.119
189	10.2.179.120/31	10.2.179.120 – 10.2.179.121	10.2.179.121
190	10.2.179.122/31	10.2.179.122 – 10.2.179.123	10.2.179.123
191	10.2.179.124/31	10.2.179.124 – 10.2.179.125	10.2.179.125
192	10.2.179.126/31	10.2.179.126 – 10.2.179.127	10.2.179.127
193	10.2.179.128/31	10.2.179.128 – 10.2.179.129	10.2.179.129
194	10.2.179.130/31	10.2.179.130 – 10.2.179.131	10.2.179.131
195	10.2.179.132/31	10.2.179.132 – 10.2.179.133	10.2.179.133
196	10.2.179.134/31	10.2.179.134 – 10.2.179.135	10.2.179.135
197	10.2.179.136/31	10.2.179.136 – 10.2.179.137	10.2.179.137
198	10.2.179.138/31	10.2.179.138 – 10.2.179.139	10.2.179.139
199	10.2.179.140/31	10.2.179.140 – 10.2.179.141	10.2.179.141
200	10.2.179.142/31	10.2.179.142 – 10.2.179.143	10.2.179.143
201	10.2.179.144/31	10.2.179.144 – 10.2.179.145	10.2.179.145
202	10.2.179.146/31	10.2.179.146 – 10.2.179.147	10.2.179.147
203	10.2.179.148/31	10.2.179.148 – 10.2.179.149	10.2.179.149
204	10.2.179.150/31	10.2.179.150 – 10.2.179.151	10.2.179.151
205	10.2.179.152/31	10.2.179.152 – 10.2.179.153	10.2.179.153
206	10.2.179.154/31	10.2.179.154 – 10.2.179.155	10.2.179.155
207	10.2.179.156/31	10.2.179.156 – 10.2.179.157	10.2.179.157
208	10.2.179.158/31	10.2.179.158 – 10.2.179.159	10.2.179.159
209	10.2.179.160/31	10.2.179.160 – 10.2.179.161	10.2.179.161
210	10.2.179.162/31	10.2.179.162 – 10.2.179.163	10.2.179.163
211	10.2.179.164/31	10.2.179.164 – 10.2.179.165	10.2.179.165
212	10.2.179.166/31	10.2.179.166 – 10.2.179.167	10.2.179.167
213	10.2.179.168/31	10.2.179.168 – 10.2.179.169	10.2.179.169
214	10.2.179.170/31	10.2.179.170 – 10.2.179.171	10.2.179.171
215	10.2.179.172/31	10.2.179.172 – 10.2.179.173	10.2.179.173
216	10.2.179.174/31	10.2.179.174 – 10.2.179.175	10.2.179.175
217	10.2.179.176/31	10.2.179.176 – 10.2.179.177	10.2.179.177
218	10.2.179.178/31	10.2.179.178 – 10.2.179.179	10.2.179.179
219	10.2.179.180/31	10.2.179.180 – 10.2.179.181	10.2.179.181
220	10.2.179.182/31	10.2.179.182 – 10.2.179.183	10.2.179.183
221	10.2.179.184/31	10.2.179.184 – 10.2.179.185	10.2.179.185
222	10.2.179.186/31	10.2.179.186 – 10.2.179.187	10.2.179.187
223	10.2.179.188/31	10.2.179.188 – 10.2.179.189	10.2.179.189
224	10.2.179.190/31	10.2.179.190 – 10.2.179.191	10.2.179.191
225	10.2.179.192/31	10.2.179.192 – 10.2.179.193	10.2.179.193
226	10.2.179.194/31	10.2.179.194 – 10.2.179.195	10.2.179.195
227	10.2.179.196/31	10.2.179.196 – 10.2.179.197	10.2.179.197
228	10.2.179.198/31	10.2.179.198 – 10.2.179.199	10.2.179.199
229	10.2.179.200/31	10.2.179.200 – 10.2.179.201	10.2.179.201
230	10.2.179.202/31	10.2.179.202 – 10.2.179.203	10.2.179.203
231	10.2.179.204/31	10.2.179.204 – 10.2.179.205	10.2.179.205
232	10.2.179.206/31	10.2.179.206 – 10.2.179.207	10.2.179.207
233	10.2.179.208/31	10.2.179.208 – 10.2.179.209	10.2.179.209
234	10.2.179.210/31	10.2.179.210 – 10.2.179.211	10.2.179.211
235	10.2.179.212/31	10.2.179.212 – 10.2.179.213	10.2.179.213
236	10.2.179.214/31	10.2.179.214 – 10.2.179.215	10.2.179.215
237	10.2.179.216/31	10.2.179.216 – 10.2.179.217	10.2.179.217
238	10.2.179.218/31	10.2.179.218 – 10.2.179.219	10.2.179.219
239	10.2.179.220/31	10.2.179.220 – 10.2.179.221	10.2.179.221
240	10.2.179.222/31	10.2.179.222 – 10.2.179.223	10.2.179.223
241	10.2.179.224/31	10.2.179.224 – 10.2.179.225	10.2.179.225
242	10.2.179.226/31	10.2.179.226 – 10.2.179.227	10.2.179.227
243	10.2.179.228/31	10.2.179.228 – 10.2.179.229	10.2.179.229
244	10.2.179.230/31	10.2.179.230 – 10.2.179.231	10.2.179.231
245	10.2.179.232/31	10.2.179.232 – 10.2.179.233	10.2.179.233
246	10.2.179.234/31	10.2.179.234 – 10.2.179.235	10.2.179.235
247	10.2.179.236/31	10.2.179.236 – 10.2.179.237	10.2.179.237
248	10.2.179.238/31	10.2.179.238 – 10.2.179.239	10.2.179.239
249	10.2.179.240/31	10.2.179.240 – 10.2.179.241	10.2.179.241
250	10.2.179.242/31	10.2.179.242 – 10.2.179.243	10.2.179.243
251	10.2.179.244/31	10.2.179.244 – 10.2.179.245	10.2.179.245
252	10.2.179.246/31	10.2.179.246 – 10.2.179.247	10.2.179.247
253	10.2.179.248/31	10.2.179.248 – 10.2.179.249	10.2.179.249
254	10.2.179.250/31	10.2.179.250 – 10.2.179.251	10.2.179.251
255	10.2.179.252/31	10.2.179.252 – 10.2.179.253	10.2.179.253
256	10.2.179.254/31	10.2.179.254 – 10.2.179.255	10.2.179.255

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 →