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)10.0.190.0/23

network10.0.190.0/23

broadcast10.0.191.255

first host10.0.190.1

last host10.0.191.254

subnet mask255.255.254.0

wildcard0.0.1.255

addresses512

usable hosts510

classA

ipcalc 10.0.190.0/23

address00001010.00000000.10111110.00000000

subnet mask11111111.11111111.11111110.00000000

network00001010.00000000.10111110.00000000

broadcast00001010.00000000.10111111.11111111

green = network part, grey = host part

hex0x0a00be00

decimal167820800

reverse dns0.190.0.10.in-addr.arpa

ipv4-mapped::ffff:a00:be00

/23 split into /31 · 256 subnets

close ×

#	network	host range	broadcast
1	10.0.190.0/31	10.0.190.0 – 10.0.190.1	10.0.190.1
2	10.0.190.2/31	10.0.190.2 – 10.0.190.3	10.0.190.3
3	10.0.190.4/31	10.0.190.4 – 10.0.190.5	10.0.190.5
4	10.0.190.6/31	10.0.190.6 – 10.0.190.7	10.0.190.7
5	10.0.190.8/31	10.0.190.8 – 10.0.190.9	10.0.190.9
6	10.0.190.10/31	10.0.190.10 – 10.0.190.11	10.0.190.11
7	10.0.190.12/31	10.0.190.12 – 10.0.190.13	10.0.190.13
8	10.0.190.14/31	10.0.190.14 – 10.0.190.15	10.0.190.15
9	10.0.190.16/31	10.0.190.16 – 10.0.190.17	10.0.190.17
10	10.0.190.18/31	10.0.190.18 – 10.0.190.19	10.0.190.19
11	10.0.190.20/31	10.0.190.20 – 10.0.190.21	10.0.190.21
12	10.0.190.22/31	10.0.190.22 – 10.0.190.23	10.0.190.23
13	10.0.190.24/31	10.0.190.24 – 10.0.190.25	10.0.190.25
14	10.0.190.26/31	10.0.190.26 – 10.0.190.27	10.0.190.27
15	10.0.190.28/31	10.0.190.28 – 10.0.190.29	10.0.190.29
16	10.0.190.30/31	10.0.190.30 – 10.0.190.31	10.0.190.31
17	10.0.190.32/31	10.0.190.32 – 10.0.190.33	10.0.190.33
18	10.0.190.34/31	10.0.190.34 – 10.0.190.35	10.0.190.35
19	10.0.190.36/31	10.0.190.36 – 10.0.190.37	10.0.190.37
20	10.0.190.38/31	10.0.190.38 – 10.0.190.39	10.0.190.39
21	10.0.190.40/31	10.0.190.40 – 10.0.190.41	10.0.190.41
22	10.0.190.42/31	10.0.190.42 – 10.0.190.43	10.0.190.43
23	10.0.190.44/31	10.0.190.44 – 10.0.190.45	10.0.190.45
24	10.0.190.46/31	10.0.190.46 – 10.0.190.47	10.0.190.47
25	10.0.190.48/31	10.0.190.48 – 10.0.190.49	10.0.190.49
26	10.0.190.50/31	10.0.190.50 – 10.0.190.51	10.0.190.51
27	10.0.190.52/31	10.0.190.52 – 10.0.190.53	10.0.190.53
28	10.0.190.54/31	10.0.190.54 – 10.0.190.55	10.0.190.55
29	10.0.190.56/31	10.0.190.56 – 10.0.190.57	10.0.190.57
30	10.0.190.58/31	10.0.190.58 – 10.0.190.59	10.0.190.59
31	10.0.190.60/31	10.0.190.60 – 10.0.190.61	10.0.190.61
32	10.0.190.62/31	10.0.190.62 – 10.0.190.63	10.0.190.63
33	10.0.190.64/31	10.0.190.64 – 10.0.190.65	10.0.190.65
34	10.0.190.66/31	10.0.190.66 – 10.0.190.67	10.0.190.67
35	10.0.190.68/31	10.0.190.68 – 10.0.190.69	10.0.190.69
36	10.0.190.70/31	10.0.190.70 – 10.0.190.71	10.0.190.71
37	10.0.190.72/31	10.0.190.72 – 10.0.190.73	10.0.190.73
38	10.0.190.74/31	10.0.190.74 – 10.0.190.75	10.0.190.75
39	10.0.190.76/31	10.0.190.76 – 10.0.190.77	10.0.190.77
40	10.0.190.78/31	10.0.190.78 – 10.0.190.79	10.0.190.79
41	10.0.190.80/31	10.0.190.80 – 10.0.190.81	10.0.190.81
42	10.0.190.82/31	10.0.190.82 – 10.0.190.83	10.0.190.83
43	10.0.190.84/31	10.0.190.84 – 10.0.190.85	10.0.190.85
44	10.0.190.86/31	10.0.190.86 – 10.0.190.87	10.0.190.87
45	10.0.190.88/31	10.0.190.88 – 10.0.190.89	10.0.190.89
46	10.0.190.90/31	10.0.190.90 – 10.0.190.91	10.0.190.91
47	10.0.190.92/31	10.0.190.92 – 10.0.190.93	10.0.190.93
48	10.0.190.94/31	10.0.190.94 – 10.0.190.95	10.0.190.95
49	10.0.190.96/31	10.0.190.96 – 10.0.190.97	10.0.190.97
50	10.0.190.98/31	10.0.190.98 – 10.0.190.99	10.0.190.99
51	10.0.190.100/31	10.0.190.100 – 10.0.190.101	10.0.190.101
52	10.0.190.102/31	10.0.190.102 – 10.0.190.103	10.0.190.103
53	10.0.190.104/31	10.0.190.104 – 10.0.190.105	10.0.190.105
54	10.0.190.106/31	10.0.190.106 – 10.0.190.107	10.0.190.107
55	10.0.190.108/31	10.0.190.108 – 10.0.190.109	10.0.190.109
56	10.0.190.110/31	10.0.190.110 – 10.0.190.111	10.0.190.111
57	10.0.190.112/31	10.0.190.112 – 10.0.190.113	10.0.190.113
58	10.0.190.114/31	10.0.190.114 – 10.0.190.115	10.0.190.115
59	10.0.190.116/31	10.0.190.116 – 10.0.190.117	10.0.190.117
60	10.0.190.118/31	10.0.190.118 – 10.0.190.119	10.0.190.119
61	10.0.190.120/31	10.0.190.120 – 10.0.190.121	10.0.190.121
62	10.0.190.122/31	10.0.190.122 – 10.0.190.123	10.0.190.123
63	10.0.190.124/31	10.0.190.124 – 10.0.190.125	10.0.190.125
64	10.0.190.126/31	10.0.190.126 – 10.0.190.127	10.0.190.127
65	10.0.190.128/31	10.0.190.128 – 10.0.190.129	10.0.190.129
66	10.0.190.130/31	10.0.190.130 – 10.0.190.131	10.0.190.131
67	10.0.190.132/31	10.0.190.132 – 10.0.190.133	10.0.190.133
68	10.0.190.134/31	10.0.190.134 – 10.0.190.135	10.0.190.135
69	10.0.190.136/31	10.0.190.136 – 10.0.190.137	10.0.190.137
70	10.0.190.138/31	10.0.190.138 – 10.0.190.139	10.0.190.139
71	10.0.190.140/31	10.0.190.140 – 10.0.190.141	10.0.190.141
72	10.0.190.142/31	10.0.190.142 – 10.0.190.143	10.0.190.143
73	10.0.190.144/31	10.0.190.144 – 10.0.190.145	10.0.190.145
74	10.0.190.146/31	10.0.190.146 – 10.0.190.147	10.0.190.147
75	10.0.190.148/31	10.0.190.148 – 10.0.190.149	10.0.190.149
76	10.0.190.150/31	10.0.190.150 – 10.0.190.151	10.0.190.151
77	10.0.190.152/31	10.0.190.152 – 10.0.190.153	10.0.190.153
78	10.0.190.154/31	10.0.190.154 – 10.0.190.155	10.0.190.155
79	10.0.190.156/31	10.0.190.156 – 10.0.190.157	10.0.190.157
80	10.0.190.158/31	10.0.190.158 – 10.0.190.159	10.0.190.159
81	10.0.190.160/31	10.0.190.160 – 10.0.190.161	10.0.190.161
82	10.0.190.162/31	10.0.190.162 – 10.0.190.163	10.0.190.163
83	10.0.190.164/31	10.0.190.164 – 10.0.190.165	10.0.190.165
84	10.0.190.166/31	10.0.190.166 – 10.0.190.167	10.0.190.167
85	10.0.190.168/31	10.0.190.168 – 10.0.190.169	10.0.190.169
86	10.0.190.170/31	10.0.190.170 – 10.0.190.171	10.0.190.171
87	10.0.190.172/31	10.0.190.172 – 10.0.190.173	10.0.190.173
88	10.0.190.174/31	10.0.190.174 – 10.0.190.175	10.0.190.175
89	10.0.190.176/31	10.0.190.176 – 10.0.190.177	10.0.190.177
90	10.0.190.178/31	10.0.190.178 – 10.0.190.179	10.0.190.179
91	10.0.190.180/31	10.0.190.180 – 10.0.190.181	10.0.190.181
92	10.0.190.182/31	10.0.190.182 – 10.0.190.183	10.0.190.183
93	10.0.190.184/31	10.0.190.184 – 10.0.190.185	10.0.190.185
94	10.0.190.186/31	10.0.190.186 – 10.0.190.187	10.0.190.187
95	10.0.190.188/31	10.0.190.188 – 10.0.190.189	10.0.190.189
96	10.0.190.190/31	10.0.190.190 – 10.0.190.191	10.0.190.191
97	10.0.190.192/31	10.0.190.192 – 10.0.190.193	10.0.190.193
98	10.0.190.194/31	10.0.190.194 – 10.0.190.195	10.0.190.195
99	10.0.190.196/31	10.0.190.196 – 10.0.190.197	10.0.190.197
100	10.0.190.198/31	10.0.190.198 – 10.0.190.199	10.0.190.199
101	10.0.190.200/31	10.0.190.200 – 10.0.190.201	10.0.190.201
102	10.0.190.202/31	10.0.190.202 – 10.0.190.203	10.0.190.203
103	10.0.190.204/31	10.0.190.204 – 10.0.190.205	10.0.190.205
104	10.0.190.206/31	10.0.190.206 – 10.0.190.207	10.0.190.207
105	10.0.190.208/31	10.0.190.208 – 10.0.190.209	10.0.190.209
106	10.0.190.210/31	10.0.190.210 – 10.0.190.211	10.0.190.211
107	10.0.190.212/31	10.0.190.212 – 10.0.190.213	10.0.190.213
108	10.0.190.214/31	10.0.190.214 – 10.0.190.215	10.0.190.215
109	10.0.190.216/31	10.0.190.216 – 10.0.190.217	10.0.190.217
110	10.0.190.218/31	10.0.190.218 – 10.0.190.219	10.0.190.219
111	10.0.190.220/31	10.0.190.220 – 10.0.190.221	10.0.190.221
112	10.0.190.222/31	10.0.190.222 – 10.0.190.223	10.0.190.223
113	10.0.190.224/31	10.0.190.224 – 10.0.190.225	10.0.190.225
114	10.0.190.226/31	10.0.190.226 – 10.0.190.227	10.0.190.227
115	10.0.190.228/31	10.0.190.228 – 10.0.190.229	10.0.190.229
116	10.0.190.230/31	10.0.190.230 – 10.0.190.231	10.0.190.231
117	10.0.190.232/31	10.0.190.232 – 10.0.190.233	10.0.190.233
118	10.0.190.234/31	10.0.190.234 – 10.0.190.235	10.0.190.235
119	10.0.190.236/31	10.0.190.236 – 10.0.190.237	10.0.190.237
120	10.0.190.238/31	10.0.190.238 – 10.0.190.239	10.0.190.239
121	10.0.190.240/31	10.0.190.240 – 10.0.190.241	10.0.190.241
122	10.0.190.242/31	10.0.190.242 – 10.0.190.243	10.0.190.243
123	10.0.190.244/31	10.0.190.244 – 10.0.190.245	10.0.190.245
124	10.0.190.246/31	10.0.190.246 – 10.0.190.247	10.0.190.247
125	10.0.190.248/31	10.0.190.248 – 10.0.190.249	10.0.190.249
126	10.0.190.250/31	10.0.190.250 – 10.0.190.251	10.0.190.251
127	10.0.190.252/31	10.0.190.252 – 10.0.190.253	10.0.190.253
128	10.0.190.254/31	10.0.190.254 – 10.0.190.255	10.0.190.255
129	10.0.191.0/31	10.0.191.0 – 10.0.191.1	10.0.191.1
130	10.0.191.2/31	10.0.191.2 – 10.0.191.3	10.0.191.3
131	10.0.191.4/31	10.0.191.4 – 10.0.191.5	10.0.191.5
132	10.0.191.6/31	10.0.191.6 – 10.0.191.7	10.0.191.7
133	10.0.191.8/31	10.0.191.8 – 10.0.191.9	10.0.191.9
134	10.0.191.10/31	10.0.191.10 – 10.0.191.11	10.0.191.11
135	10.0.191.12/31	10.0.191.12 – 10.0.191.13	10.0.191.13
136	10.0.191.14/31	10.0.191.14 – 10.0.191.15	10.0.191.15
137	10.0.191.16/31	10.0.191.16 – 10.0.191.17	10.0.191.17
138	10.0.191.18/31	10.0.191.18 – 10.0.191.19	10.0.191.19
139	10.0.191.20/31	10.0.191.20 – 10.0.191.21	10.0.191.21
140	10.0.191.22/31	10.0.191.22 – 10.0.191.23	10.0.191.23
141	10.0.191.24/31	10.0.191.24 – 10.0.191.25	10.0.191.25
142	10.0.191.26/31	10.0.191.26 – 10.0.191.27	10.0.191.27
143	10.0.191.28/31	10.0.191.28 – 10.0.191.29	10.0.191.29
144	10.0.191.30/31	10.0.191.30 – 10.0.191.31	10.0.191.31
145	10.0.191.32/31	10.0.191.32 – 10.0.191.33	10.0.191.33
146	10.0.191.34/31	10.0.191.34 – 10.0.191.35	10.0.191.35
147	10.0.191.36/31	10.0.191.36 – 10.0.191.37	10.0.191.37
148	10.0.191.38/31	10.0.191.38 – 10.0.191.39	10.0.191.39
149	10.0.191.40/31	10.0.191.40 – 10.0.191.41	10.0.191.41
150	10.0.191.42/31	10.0.191.42 – 10.0.191.43	10.0.191.43
151	10.0.191.44/31	10.0.191.44 – 10.0.191.45	10.0.191.45
152	10.0.191.46/31	10.0.191.46 – 10.0.191.47	10.0.191.47
153	10.0.191.48/31	10.0.191.48 – 10.0.191.49	10.0.191.49
154	10.0.191.50/31	10.0.191.50 – 10.0.191.51	10.0.191.51
155	10.0.191.52/31	10.0.191.52 – 10.0.191.53	10.0.191.53
156	10.0.191.54/31	10.0.191.54 – 10.0.191.55	10.0.191.55
157	10.0.191.56/31	10.0.191.56 – 10.0.191.57	10.0.191.57
158	10.0.191.58/31	10.0.191.58 – 10.0.191.59	10.0.191.59
159	10.0.191.60/31	10.0.191.60 – 10.0.191.61	10.0.191.61
160	10.0.191.62/31	10.0.191.62 – 10.0.191.63	10.0.191.63
161	10.0.191.64/31	10.0.191.64 – 10.0.191.65	10.0.191.65
162	10.0.191.66/31	10.0.191.66 – 10.0.191.67	10.0.191.67
163	10.0.191.68/31	10.0.191.68 – 10.0.191.69	10.0.191.69
164	10.0.191.70/31	10.0.191.70 – 10.0.191.71	10.0.191.71
165	10.0.191.72/31	10.0.191.72 – 10.0.191.73	10.0.191.73
166	10.0.191.74/31	10.0.191.74 – 10.0.191.75	10.0.191.75
167	10.0.191.76/31	10.0.191.76 – 10.0.191.77	10.0.191.77
168	10.0.191.78/31	10.0.191.78 – 10.0.191.79	10.0.191.79
169	10.0.191.80/31	10.0.191.80 – 10.0.191.81	10.0.191.81
170	10.0.191.82/31	10.0.191.82 – 10.0.191.83	10.0.191.83
171	10.0.191.84/31	10.0.191.84 – 10.0.191.85	10.0.191.85
172	10.0.191.86/31	10.0.191.86 – 10.0.191.87	10.0.191.87
173	10.0.191.88/31	10.0.191.88 – 10.0.191.89	10.0.191.89
174	10.0.191.90/31	10.0.191.90 – 10.0.191.91	10.0.191.91
175	10.0.191.92/31	10.0.191.92 – 10.0.191.93	10.0.191.93
176	10.0.191.94/31	10.0.191.94 – 10.0.191.95	10.0.191.95
177	10.0.191.96/31	10.0.191.96 – 10.0.191.97	10.0.191.97
178	10.0.191.98/31	10.0.191.98 – 10.0.191.99	10.0.191.99
179	10.0.191.100/31	10.0.191.100 – 10.0.191.101	10.0.191.101
180	10.0.191.102/31	10.0.191.102 – 10.0.191.103	10.0.191.103
181	10.0.191.104/31	10.0.191.104 – 10.0.191.105	10.0.191.105
182	10.0.191.106/31	10.0.191.106 – 10.0.191.107	10.0.191.107
183	10.0.191.108/31	10.0.191.108 – 10.0.191.109	10.0.191.109
184	10.0.191.110/31	10.0.191.110 – 10.0.191.111	10.0.191.111
185	10.0.191.112/31	10.0.191.112 – 10.0.191.113	10.0.191.113
186	10.0.191.114/31	10.0.191.114 – 10.0.191.115	10.0.191.115
187	10.0.191.116/31	10.0.191.116 – 10.0.191.117	10.0.191.117
188	10.0.191.118/31	10.0.191.118 – 10.0.191.119	10.0.191.119
189	10.0.191.120/31	10.0.191.120 – 10.0.191.121	10.0.191.121
190	10.0.191.122/31	10.0.191.122 – 10.0.191.123	10.0.191.123
191	10.0.191.124/31	10.0.191.124 – 10.0.191.125	10.0.191.125
192	10.0.191.126/31	10.0.191.126 – 10.0.191.127	10.0.191.127
193	10.0.191.128/31	10.0.191.128 – 10.0.191.129	10.0.191.129
194	10.0.191.130/31	10.0.191.130 – 10.0.191.131	10.0.191.131
195	10.0.191.132/31	10.0.191.132 – 10.0.191.133	10.0.191.133
196	10.0.191.134/31	10.0.191.134 – 10.0.191.135	10.0.191.135
197	10.0.191.136/31	10.0.191.136 – 10.0.191.137	10.0.191.137
198	10.0.191.138/31	10.0.191.138 – 10.0.191.139	10.0.191.139
199	10.0.191.140/31	10.0.191.140 – 10.0.191.141	10.0.191.141
200	10.0.191.142/31	10.0.191.142 – 10.0.191.143	10.0.191.143
201	10.0.191.144/31	10.0.191.144 – 10.0.191.145	10.0.191.145
202	10.0.191.146/31	10.0.191.146 – 10.0.191.147	10.0.191.147
203	10.0.191.148/31	10.0.191.148 – 10.0.191.149	10.0.191.149
204	10.0.191.150/31	10.0.191.150 – 10.0.191.151	10.0.191.151
205	10.0.191.152/31	10.0.191.152 – 10.0.191.153	10.0.191.153
206	10.0.191.154/31	10.0.191.154 – 10.0.191.155	10.0.191.155
207	10.0.191.156/31	10.0.191.156 – 10.0.191.157	10.0.191.157
208	10.0.191.158/31	10.0.191.158 – 10.0.191.159	10.0.191.159
209	10.0.191.160/31	10.0.191.160 – 10.0.191.161	10.0.191.161
210	10.0.191.162/31	10.0.191.162 – 10.0.191.163	10.0.191.163
211	10.0.191.164/31	10.0.191.164 – 10.0.191.165	10.0.191.165
212	10.0.191.166/31	10.0.191.166 – 10.0.191.167	10.0.191.167
213	10.0.191.168/31	10.0.191.168 – 10.0.191.169	10.0.191.169
214	10.0.191.170/31	10.0.191.170 – 10.0.191.171	10.0.191.171
215	10.0.191.172/31	10.0.191.172 – 10.0.191.173	10.0.191.173
216	10.0.191.174/31	10.0.191.174 – 10.0.191.175	10.0.191.175
217	10.0.191.176/31	10.0.191.176 – 10.0.191.177	10.0.191.177
218	10.0.191.178/31	10.0.191.178 – 10.0.191.179	10.0.191.179
219	10.0.191.180/31	10.0.191.180 – 10.0.191.181	10.0.191.181
220	10.0.191.182/31	10.0.191.182 – 10.0.191.183	10.0.191.183
221	10.0.191.184/31	10.0.191.184 – 10.0.191.185	10.0.191.185
222	10.0.191.186/31	10.0.191.186 – 10.0.191.187	10.0.191.187
223	10.0.191.188/31	10.0.191.188 – 10.0.191.189	10.0.191.189
224	10.0.191.190/31	10.0.191.190 – 10.0.191.191	10.0.191.191
225	10.0.191.192/31	10.0.191.192 – 10.0.191.193	10.0.191.193
226	10.0.191.194/31	10.0.191.194 – 10.0.191.195	10.0.191.195
227	10.0.191.196/31	10.0.191.196 – 10.0.191.197	10.0.191.197
228	10.0.191.198/31	10.0.191.198 – 10.0.191.199	10.0.191.199
229	10.0.191.200/31	10.0.191.200 – 10.0.191.201	10.0.191.201
230	10.0.191.202/31	10.0.191.202 – 10.0.191.203	10.0.191.203
231	10.0.191.204/31	10.0.191.204 – 10.0.191.205	10.0.191.205
232	10.0.191.206/31	10.0.191.206 – 10.0.191.207	10.0.191.207
233	10.0.191.208/31	10.0.191.208 – 10.0.191.209	10.0.191.209
234	10.0.191.210/31	10.0.191.210 – 10.0.191.211	10.0.191.211
235	10.0.191.212/31	10.0.191.212 – 10.0.191.213	10.0.191.213
236	10.0.191.214/31	10.0.191.214 – 10.0.191.215	10.0.191.215
237	10.0.191.216/31	10.0.191.216 – 10.0.191.217	10.0.191.217
238	10.0.191.218/31	10.0.191.218 – 10.0.191.219	10.0.191.219
239	10.0.191.220/31	10.0.191.220 – 10.0.191.221	10.0.191.221
240	10.0.191.222/31	10.0.191.222 – 10.0.191.223	10.0.191.223
241	10.0.191.224/31	10.0.191.224 – 10.0.191.225	10.0.191.225
242	10.0.191.226/31	10.0.191.226 – 10.0.191.227	10.0.191.227
243	10.0.191.228/31	10.0.191.228 – 10.0.191.229	10.0.191.229
244	10.0.191.230/31	10.0.191.230 – 10.0.191.231	10.0.191.231
245	10.0.191.232/31	10.0.191.232 – 10.0.191.233	10.0.191.233
246	10.0.191.234/31	10.0.191.234 – 10.0.191.235	10.0.191.235
247	10.0.191.236/31	10.0.191.236 – 10.0.191.237	10.0.191.237
248	10.0.191.238/31	10.0.191.238 – 10.0.191.239	10.0.191.239
249	10.0.191.240/31	10.0.191.240 – 10.0.191.241	10.0.191.241
250	10.0.191.242/31	10.0.191.242 – 10.0.191.243	10.0.191.243
251	10.0.191.244/31	10.0.191.244 – 10.0.191.245	10.0.191.245
252	10.0.191.246/31	10.0.191.246 – 10.0.191.247	10.0.191.247
253	10.0.191.248/31	10.0.191.248 – 10.0.191.249	10.0.191.249
254	10.0.191.250/31	10.0.191.250 – 10.0.191.251	10.0.191.251
255	10.0.191.252/31	10.0.191.252 – 10.0.191.253	10.0.191.253
256	10.0.191.254/31	10.0.191.254 – 10.0.191.255	10.0.191.255

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 →