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)10.3.6.0/23

network10.3.6.0/23

broadcast10.3.7.255

first host10.3.6.1

last host10.3.7.254

subnet mask255.255.254.0

wildcard0.0.1.255

addresses512

usable hosts510

classA

ipcalc 10.3.6.0/23

address00001010.00000011.00000110.00000000

subnet mask11111111.11111111.11111110.00000000

network00001010.00000011.00000110.00000000

broadcast00001010.00000011.00000111.11111111

green = network part, grey = host part

hex0x0a030600

decimal167970304

reverse dns0.6.3.10.in-addr.arpa

ipv4-mapped::ffff:a03:600

/23 split into /31 · 256 subnets

close ×

#	network	host range	broadcast
1	10.3.6.0/31	10.3.6.0 – 10.3.6.1	10.3.6.1
2	10.3.6.2/31	10.3.6.2 – 10.3.6.3	10.3.6.3
3	10.3.6.4/31	10.3.6.4 – 10.3.6.5	10.3.6.5
4	10.3.6.6/31	10.3.6.6 – 10.3.6.7	10.3.6.7
5	10.3.6.8/31	10.3.6.8 – 10.3.6.9	10.3.6.9
6	10.3.6.10/31	10.3.6.10 – 10.3.6.11	10.3.6.11
7	10.3.6.12/31	10.3.6.12 – 10.3.6.13	10.3.6.13
8	10.3.6.14/31	10.3.6.14 – 10.3.6.15	10.3.6.15
9	10.3.6.16/31	10.3.6.16 – 10.3.6.17	10.3.6.17
10	10.3.6.18/31	10.3.6.18 – 10.3.6.19	10.3.6.19
11	10.3.6.20/31	10.3.6.20 – 10.3.6.21	10.3.6.21
12	10.3.6.22/31	10.3.6.22 – 10.3.6.23	10.3.6.23
13	10.3.6.24/31	10.3.6.24 – 10.3.6.25	10.3.6.25
14	10.3.6.26/31	10.3.6.26 – 10.3.6.27	10.3.6.27
15	10.3.6.28/31	10.3.6.28 – 10.3.6.29	10.3.6.29
16	10.3.6.30/31	10.3.6.30 – 10.3.6.31	10.3.6.31
17	10.3.6.32/31	10.3.6.32 – 10.3.6.33	10.3.6.33
18	10.3.6.34/31	10.3.6.34 – 10.3.6.35	10.3.6.35
19	10.3.6.36/31	10.3.6.36 – 10.3.6.37	10.3.6.37
20	10.3.6.38/31	10.3.6.38 – 10.3.6.39	10.3.6.39
21	10.3.6.40/31	10.3.6.40 – 10.3.6.41	10.3.6.41
22	10.3.6.42/31	10.3.6.42 – 10.3.6.43	10.3.6.43
23	10.3.6.44/31	10.3.6.44 – 10.3.6.45	10.3.6.45
24	10.3.6.46/31	10.3.6.46 – 10.3.6.47	10.3.6.47
25	10.3.6.48/31	10.3.6.48 – 10.3.6.49	10.3.6.49
26	10.3.6.50/31	10.3.6.50 – 10.3.6.51	10.3.6.51
27	10.3.6.52/31	10.3.6.52 – 10.3.6.53	10.3.6.53
28	10.3.6.54/31	10.3.6.54 – 10.3.6.55	10.3.6.55
29	10.3.6.56/31	10.3.6.56 – 10.3.6.57	10.3.6.57
30	10.3.6.58/31	10.3.6.58 – 10.3.6.59	10.3.6.59
31	10.3.6.60/31	10.3.6.60 – 10.3.6.61	10.3.6.61
32	10.3.6.62/31	10.3.6.62 – 10.3.6.63	10.3.6.63
33	10.3.6.64/31	10.3.6.64 – 10.3.6.65	10.3.6.65
34	10.3.6.66/31	10.3.6.66 – 10.3.6.67	10.3.6.67
35	10.3.6.68/31	10.3.6.68 – 10.3.6.69	10.3.6.69
36	10.3.6.70/31	10.3.6.70 – 10.3.6.71	10.3.6.71
37	10.3.6.72/31	10.3.6.72 – 10.3.6.73	10.3.6.73
38	10.3.6.74/31	10.3.6.74 – 10.3.6.75	10.3.6.75
39	10.3.6.76/31	10.3.6.76 – 10.3.6.77	10.3.6.77
40	10.3.6.78/31	10.3.6.78 – 10.3.6.79	10.3.6.79
41	10.3.6.80/31	10.3.6.80 – 10.3.6.81	10.3.6.81
42	10.3.6.82/31	10.3.6.82 – 10.3.6.83	10.3.6.83
43	10.3.6.84/31	10.3.6.84 – 10.3.6.85	10.3.6.85
44	10.3.6.86/31	10.3.6.86 – 10.3.6.87	10.3.6.87
45	10.3.6.88/31	10.3.6.88 – 10.3.6.89	10.3.6.89
46	10.3.6.90/31	10.3.6.90 – 10.3.6.91	10.3.6.91
47	10.3.6.92/31	10.3.6.92 – 10.3.6.93	10.3.6.93
48	10.3.6.94/31	10.3.6.94 – 10.3.6.95	10.3.6.95
49	10.3.6.96/31	10.3.6.96 – 10.3.6.97	10.3.6.97
50	10.3.6.98/31	10.3.6.98 – 10.3.6.99	10.3.6.99
51	10.3.6.100/31	10.3.6.100 – 10.3.6.101	10.3.6.101
52	10.3.6.102/31	10.3.6.102 – 10.3.6.103	10.3.6.103
53	10.3.6.104/31	10.3.6.104 – 10.3.6.105	10.3.6.105
54	10.3.6.106/31	10.3.6.106 – 10.3.6.107	10.3.6.107
55	10.3.6.108/31	10.3.6.108 – 10.3.6.109	10.3.6.109
56	10.3.6.110/31	10.3.6.110 – 10.3.6.111	10.3.6.111
57	10.3.6.112/31	10.3.6.112 – 10.3.6.113	10.3.6.113
58	10.3.6.114/31	10.3.6.114 – 10.3.6.115	10.3.6.115
59	10.3.6.116/31	10.3.6.116 – 10.3.6.117	10.3.6.117
60	10.3.6.118/31	10.3.6.118 – 10.3.6.119	10.3.6.119
61	10.3.6.120/31	10.3.6.120 – 10.3.6.121	10.3.6.121
62	10.3.6.122/31	10.3.6.122 – 10.3.6.123	10.3.6.123
63	10.3.6.124/31	10.3.6.124 – 10.3.6.125	10.3.6.125
64	10.3.6.126/31	10.3.6.126 – 10.3.6.127	10.3.6.127
65	10.3.6.128/31	10.3.6.128 – 10.3.6.129	10.3.6.129
66	10.3.6.130/31	10.3.6.130 – 10.3.6.131	10.3.6.131
67	10.3.6.132/31	10.3.6.132 – 10.3.6.133	10.3.6.133
68	10.3.6.134/31	10.3.6.134 – 10.3.6.135	10.3.6.135
69	10.3.6.136/31	10.3.6.136 – 10.3.6.137	10.3.6.137
70	10.3.6.138/31	10.3.6.138 – 10.3.6.139	10.3.6.139
71	10.3.6.140/31	10.3.6.140 – 10.3.6.141	10.3.6.141
72	10.3.6.142/31	10.3.6.142 – 10.3.6.143	10.3.6.143
73	10.3.6.144/31	10.3.6.144 – 10.3.6.145	10.3.6.145
74	10.3.6.146/31	10.3.6.146 – 10.3.6.147	10.3.6.147
75	10.3.6.148/31	10.3.6.148 – 10.3.6.149	10.3.6.149
76	10.3.6.150/31	10.3.6.150 – 10.3.6.151	10.3.6.151
77	10.3.6.152/31	10.3.6.152 – 10.3.6.153	10.3.6.153
78	10.3.6.154/31	10.3.6.154 – 10.3.6.155	10.3.6.155
79	10.3.6.156/31	10.3.6.156 – 10.3.6.157	10.3.6.157
80	10.3.6.158/31	10.3.6.158 – 10.3.6.159	10.3.6.159
81	10.3.6.160/31	10.3.6.160 – 10.3.6.161	10.3.6.161
82	10.3.6.162/31	10.3.6.162 – 10.3.6.163	10.3.6.163
83	10.3.6.164/31	10.3.6.164 – 10.3.6.165	10.3.6.165
84	10.3.6.166/31	10.3.6.166 – 10.3.6.167	10.3.6.167
85	10.3.6.168/31	10.3.6.168 – 10.3.6.169	10.3.6.169
86	10.3.6.170/31	10.3.6.170 – 10.3.6.171	10.3.6.171
87	10.3.6.172/31	10.3.6.172 – 10.3.6.173	10.3.6.173
88	10.3.6.174/31	10.3.6.174 – 10.3.6.175	10.3.6.175
89	10.3.6.176/31	10.3.6.176 – 10.3.6.177	10.3.6.177
90	10.3.6.178/31	10.3.6.178 – 10.3.6.179	10.3.6.179
91	10.3.6.180/31	10.3.6.180 – 10.3.6.181	10.3.6.181
92	10.3.6.182/31	10.3.6.182 – 10.3.6.183	10.3.6.183
93	10.3.6.184/31	10.3.6.184 – 10.3.6.185	10.3.6.185
94	10.3.6.186/31	10.3.6.186 – 10.3.6.187	10.3.6.187
95	10.3.6.188/31	10.3.6.188 – 10.3.6.189	10.3.6.189
96	10.3.6.190/31	10.3.6.190 – 10.3.6.191	10.3.6.191
97	10.3.6.192/31	10.3.6.192 – 10.3.6.193	10.3.6.193
98	10.3.6.194/31	10.3.6.194 – 10.3.6.195	10.3.6.195
99	10.3.6.196/31	10.3.6.196 – 10.3.6.197	10.3.6.197
100	10.3.6.198/31	10.3.6.198 – 10.3.6.199	10.3.6.199
101	10.3.6.200/31	10.3.6.200 – 10.3.6.201	10.3.6.201
102	10.3.6.202/31	10.3.6.202 – 10.3.6.203	10.3.6.203
103	10.3.6.204/31	10.3.6.204 – 10.3.6.205	10.3.6.205
104	10.3.6.206/31	10.3.6.206 – 10.3.6.207	10.3.6.207
105	10.3.6.208/31	10.3.6.208 – 10.3.6.209	10.3.6.209
106	10.3.6.210/31	10.3.6.210 – 10.3.6.211	10.3.6.211
107	10.3.6.212/31	10.3.6.212 – 10.3.6.213	10.3.6.213
108	10.3.6.214/31	10.3.6.214 – 10.3.6.215	10.3.6.215
109	10.3.6.216/31	10.3.6.216 – 10.3.6.217	10.3.6.217
110	10.3.6.218/31	10.3.6.218 – 10.3.6.219	10.3.6.219
111	10.3.6.220/31	10.3.6.220 – 10.3.6.221	10.3.6.221
112	10.3.6.222/31	10.3.6.222 – 10.3.6.223	10.3.6.223
113	10.3.6.224/31	10.3.6.224 – 10.3.6.225	10.3.6.225
114	10.3.6.226/31	10.3.6.226 – 10.3.6.227	10.3.6.227
115	10.3.6.228/31	10.3.6.228 – 10.3.6.229	10.3.6.229
116	10.3.6.230/31	10.3.6.230 – 10.3.6.231	10.3.6.231
117	10.3.6.232/31	10.3.6.232 – 10.3.6.233	10.3.6.233
118	10.3.6.234/31	10.3.6.234 – 10.3.6.235	10.3.6.235
119	10.3.6.236/31	10.3.6.236 – 10.3.6.237	10.3.6.237
120	10.3.6.238/31	10.3.6.238 – 10.3.6.239	10.3.6.239
121	10.3.6.240/31	10.3.6.240 – 10.3.6.241	10.3.6.241
122	10.3.6.242/31	10.3.6.242 – 10.3.6.243	10.3.6.243
123	10.3.6.244/31	10.3.6.244 – 10.3.6.245	10.3.6.245
124	10.3.6.246/31	10.3.6.246 – 10.3.6.247	10.3.6.247
125	10.3.6.248/31	10.3.6.248 – 10.3.6.249	10.3.6.249
126	10.3.6.250/31	10.3.6.250 – 10.3.6.251	10.3.6.251
127	10.3.6.252/31	10.3.6.252 – 10.3.6.253	10.3.6.253
128	10.3.6.254/31	10.3.6.254 – 10.3.6.255	10.3.6.255
129	10.3.7.0/31	10.3.7.0 – 10.3.7.1	10.3.7.1
130	10.3.7.2/31	10.3.7.2 – 10.3.7.3	10.3.7.3
131	10.3.7.4/31	10.3.7.4 – 10.3.7.5	10.3.7.5
132	10.3.7.6/31	10.3.7.6 – 10.3.7.7	10.3.7.7
133	10.3.7.8/31	10.3.7.8 – 10.3.7.9	10.3.7.9
134	10.3.7.10/31	10.3.7.10 – 10.3.7.11	10.3.7.11
135	10.3.7.12/31	10.3.7.12 – 10.3.7.13	10.3.7.13
136	10.3.7.14/31	10.3.7.14 – 10.3.7.15	10.3.7.15
137	10.3.7.16/31	10.3.7.16 – 10.3.7.17	10.3.7.17
138	10.3.7.18/31	10.3.7.18 – 10.3.7.19	10.3.7.19
139	10.3.7.20/31	10.3.7.20 – 10.3.7.21	10.3.7.21
140	10.3.7.22/31	10.3.7.22 – 10.3.7.23	10.3.7.23
141	10.3.7.24/31	10.3.7.24 – 10.3.7.25	10.3.7.25
142	10.3.7.26/31	10.3.7.26 – 10.3.7.27	10.3.7.27
143	10.3.7.28/31	10.3.7.28 – 10.3.7.29	10.3.7.29
144	10.3.7.30/31	10.3.7.30 – 10.3.7.31	10.3.7.31
145	10.3.7.32/31	10.3.7.32 – 10.3.7.33	10.3.7.33
146	10.3.7.34/31	10.3.7.34 – 10.3.7.35	10.3.7.35
147	10.3.7.36/31	10.3.7.36 – 10.3.7.37	10.3.7.37
148	10.3.7.38/31	10.3.7.38 – 10.3.7.39	10.3.7.39
149	10.3.7.40/31	10.3.7.40 – 10.3.7.41	10.3.7.41
150	10.3.7.42/31	10.3.7.42 – 10.3.7.43	10.3.7.43
151	10.3.7.44/31	10.3.7.44 – 10.3.7.45	10.3.7.45
152	10.3.7.46/31	10.3.7.46 – 10.3.7.47	10.3.7.47
153	10.3.7.48/31	10.3.7.48 – 10.3.7.49	10.3.7.49
154	10.3.7.50/31	10.3.7.50 – 10.3.7.51	10.3.7.51
155	10.3.7.52/31	10.3.7.52 – 10.3.7.53	10.3.7.53
156	10.3.7.54/31	10.3.7.54 – 10.3.7.55	10.3.7.55
157	10.3.7.56/31	10.3.7.56 – 10.3.7.57	10.3.7.57
158	10.3.7.58/31	10.3.7.58 – 10.3.7.59	10.3.7.59
159	10.3.7.60/31	10.3.7.60 – 10.3.7.61	10.3.7.61
160	10.3.7.62/31	10.3.7.62 – 10.3.7.63	10.3.7.63
161	10.3.7.64/31	10.3.7.64 – 10.3.7.65	10.3.7.65
162	10.3.7.66/31	10.3.7.66 – 10.3.7.67	10.3.7.67
163	10.3.7.68/31	10.3.7.68 – 10.3.7.69	10.3.7.69
164	10.3.7.70/31	10.3.7.70 – 10.3.7.71	10.3.7.71
165	10.3.7.72/31	10.3.7.72 – 10.3.7.73	10.3.7.73
166	10.3.7.74/31	10.3.7.74 – 10.3.7.75	10.3.7.75
167	10.3.7.76/31	10.3.7.76 – 10.3.7.77	10.3.7.77
168	10.3.7.78/31	10.3.7.78 – 10.3.7.79	10.3.7.79
169	10.3.7.80/31	10.3.7.80 – 10.3.7.81	10.3.7.81
170	10.3.7.82/31	10.3.7.82 – 10.3.7.83	10.3.7.83
171	10.3.7.84/31	10.3.7.84 – 10.3.7.85	10.3.7.85
172	10.3.7.86/31	10.3.7.86 – 10.3.7.87	10.3.7.87
173	10.3.7.88/31	10.3.7.88 – 10.3.7.89	10.3.7.89
174	10.3.7.90/31	10.3.7.90 – 10.3.7.91	10.3.7.91
175	10.3.7.92/31	10.3.7.92 – 10.3.7.93	10.3.7.93
176	10.3.7.94/31	10.3.7.94 – 10.3.7.95	10.3.7.95
177	10.3.7.96/31	10.3.7.96 – 10.3.7.97	10.3.7.97
178	10.3.7.98/31	10.3.7.98 – 10.3.7.99	10.3.7.99
179	10.3.7.100/31	10.3.7.100 – 10.3.7.101	10.3.7.101
180	10.3.7.102/31	10.3.7.102 – 10.3.7.103	10.3.7.103
181	10.3.7.104/31	10.3.7.104 – 10.3.7.105	10.3.7.105
182	10.3.7.106/31	10.3.7.106 – 10.3.7.107	10.3.7.107
183	10.3.7.108/31	10.3.7.108 – 10.3.7.109	10.3.7.109
184	10.3.7.110/31	10.3.7.110 – 10.3.7.111	10.3.7.111
185	10.3.7.112/31	10.3.7.112 – 10.3.7.113	10.3.7.113
186	10.3.7.114/31	10.3.7.114 – 10.3.7.115	10.3.7.115
187	10.3.7.116/31	10.3.7.116 – 10.3.7.117	10.3.7.117
188	10.3.7.118/31	10.3.7.118 – 10.3.7.119	10.3.7.119
189	10.3.7.120/31	10.3.7.120 – 10.3.7.121	10.3.7.121
190	10.3.7.122/31	10.3.7.122 – 10.3.7.123	10.3.7.123
191	10.3.7.124/31	10.3.7.124 – 10.3.7.125	10.3.7.125
192	10.3.7.126/31	10.3.7.126 – 10.3.7.127	10.3.7.127
193	10.3.7.128/31	10.3.7.128 – 10.3.7.129	10.3.7.129
194	10.3.7.130/31	10.3.7.130 – 10.3.7.131	10.3.7.131
195	10.3.7.132/31	10.3.7.132 – 10.3.7.133	10.3.7.133
196	10.3.7.134/31	10.3.7.134 – 10.3.7.135	10.3.7.135
197	10.3.7.136/31	10.3.7.136 – 10.3.7.137	10.3.7.137
198	10.3.7.138/31	10.3.7.138 – 10.3.7.139	10.3.7.139
199	10.3.7.140/31	10.3.7.140 – 10.3.7.141	10.3.7.141
200	10.3.7.142/31	10.3.7.142 – 10.3.7.143	10.3.7.143
201	10.3.7.144/31	10.3.7.144 – 10.3.7.145	10.3.7.145
202	10.3.7.146/31	10.3.7.146 – 10.3.7.147	10.3.7.147
203	10.3.7.148/31	10.3.7.148 – 10.3.7.149	10.3.7.149
204	10.3.7.150/31	10.3.7.150 – 10.3.7.151	10.3.7.151
205	10.3.7.152/31	10.3.7.152 – 10.3.7.153	10.3.7.153
206	10.3.7.154/31	10.3.7.154 – 10.3.7.155	10.3.7.155
207	10.3.7.156/31	10.3.7.156 – 10.3.7.157	10.3.7.157
208	10.3.7.158/31	10.3.7.158 – 10.3.7.159	10.3.7.159
209	10.3.7.160/31	10.3.7.160 – 10.3.7.161	10.3.7.161
210	10.3.7.162/31	10.3.7.162 – 10.3.7.163	10.3.7.163
211	10.3.7.164/31	10.3.7.164 – 10.3.7.165	10.3.7.165
212	10.3.7.166/31	10.3.7.166 – 10.3.7.167	10.3.7.167
213	10.3.7.168/31	10.3.7.168 – 10.3.7.169	10.3.7.169
214	10.3.7.170/31	10.3.7.170 – 10.3.7.171	10.3.7.171
215	10.3.7.172/31	10.3.7.172 – 10.3.7.173	10.3.7.173
216	10.3.7.174/31	10.3.7.174 – 10.3.7.175	10.3.7.175
217	10.3.7.176/31	10.3.7.176 – 10.3.7.177	10.3.7.177
218	10.3.7.178/31	10.3.7.178 – 10.3.7.179	10.3.7.179
219	10.3.7.180/31	10.3.7.180 – 10.3.7.181	10.3.7.181
220	10.3.7.182/31	10.3.7.182 – 10.3.7.183	10.3.7.183
221	10.3.7.184/31	10.3.7.184 – 10.3.7.185	10.3.7.185
222	10.3.7.186/31	10.3.7.186 – 10.3.7.187	10.3.7.187
223	10.3.7.188/31	10.3.7.188 – 10.3.7.189	10.3.7.189
224	10.3.7.190/31	10.3.7.190 – 10.3.7.191	10.3.7.191
225	10.3.7.192/31	10.3.7.192 – 10.3.7.193	10.3.7.193
226	10.3.7.194/31	10.3.7.194 – 10.3.7.195	10.3.7.195
227	10.3.7.196/31	10.3.7.196 – 10.3.7.197	10.3.7.197
228	10.3.7.198/31	10.3.7.198 – 10.3.7.199	10.3.7.199
229	10.3.7.200/31	10.3.7.200 – 10.3.7.201	10.3.7.201
230	10.3.7.202/31	10.3.7.202 – 10.3.7.203	10.3.7.203
231	10.3.7.204/31	10.3.7.204 – 10.3.7.205	10.3.7.205
232	10.3.7.206/31	10.3.7.206 – 10.3.7.207	10.3.7.207
233	10.3.7.208/31	10.3.7.208 – 10.3.7.209	10.3.7.209
234	10.3.7.210/31	10.3.7.210 – 10.3.7.211	10.3.7.211
235	10.3.7.212/31	10.3.7.212 – 10.3.7.213	10.3.7.213
236	10.3.7.214/31	10.3.7.214 – 10.3.7.215	10.3.7.215
237	10.3.7.216/31	10.3.7.216 – 10.3.7.217	10.3.7.217
238	10.3.7.218/31	10.3.7.218 – 10.3.7.219	10.3.7.219
239	10.3.7.220/31	10.3.7.220 – 10.3.7.221	10.3.7.221
240	10.3.7.222/31	10.3.7.222 – 10.3.7.223	10.3.7.223
241	10.3.7.224/31	10.3.7.224 – 10.3.7.225	10.3.7.225
242	10.3.7.226/31	10.3.7.226 – 10.3.7.227	10.3.7.227
243	10.3.7.228/31	10.3.7.228 – 10.3.7.229	10.3.7.229
244	10.3.7.230/31	10.3.7.230 – 10.3.7.231	10.3.7.231
245	10.3.7.232/31	10.3.7.232 – 10.3.7.233	10.3.7.233
246	10.3.7.234/31	10.3.7.234 – 10.3.7.235	10.3.7.235
247	10.3.7.236/31	10.3.7.236 – 10.3.7.237	10.3.7.237
248	10.3.7.238/31	10.3.7.238 – 10.3.7.239	10.3.7.239
249	10.3.7.240/31	10.3.7.240 – 10.3.7.241	10.3.7.241
250	10.3.7.242/31	10.3.7.242 – 10.3.7.243	10.3.7.243
251	10.3.7.244/31	10.3.7.244 – 10.3.7.245	10.3.7.245
252	10.3.7.246/31	10.3.7.246 – 10.3.7.247	10.3.7.247
253	10.3.7.248/31	10.3.7.248 – 10.3.7.249	10.3.7.249
254	10.3.7.250/31	10.3.7.250 – 10.3.7.251	10.3.7.251
255	10.3.7.252/31	10.3.7.252 – 10.3.7.253	10.3.7.253
256	10.3.7.254/31	10.3.7.254 – 10.3.7.255	10.3.7.255

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 →