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)10.2.236.0/23

network10.2.236.0/23

broadcast10.2.237.255

first host10.2.236.1

last host10.2.237.254

subnet mask255.255.254.0

wildcard0.0.1.255

addresses512

usable hosts510

classA

ipcalc 10.2.236.0/23

address00001010.00000010.11101100.00000000

subnet mask11111111.11111111.11111110.00000000

network00001010.00000010.11101100.00000000

broadcast00001010.00000010.11101101.11111111

green = network part, grey = host part

hex0x0a02ec00

decimal167963648

reverse dns0.236.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:ec00

/23 split into /31 · 256 subnets

close ×

#	network	host range	broadcast
1	10.2.236.0/31	10.2.236.0 – 10.2.236.1	10.2.236.1
2	10.2.236.2/31	10.2.236.2 – 10.2.236.3	10.2.236.3
3	10.2.236.4/31	10.2.236.4 – 10.2.236.5	10.2.236.5
4	10.2.236.6/31	10.2.236.6 – 10.2.236.7	10.2.236.7
5	10.2.236.8/31	10.2.236.8 – 10.2.236.9	10.2.236.9
6	10.2.236.10/31	10.2.236.10 – 10.2.236.11	10.2.236.11
7	10.2.236.12/31	10.2.236.12 – 10.2.236.13	10.2.236.13
8	10.2.236.14/31	10.2.236.14 – 10.2.236.15	10.2.236.15
9	10.2.236.16/31	10.2.236.16 – 10.2.236.17	10.2.236.17
10	10.2.236.18/31	10.2.236.18 – 10.2.236.19	10.2.236.19
11	10.2.236.20/31	10.2.236.20 – 10.2.236.21	10.2.236.21
12	10.2.236.22/31	10.2.236.22 – 10.2.236.23	10.2.236.23
13	10.2.236.24/31	10.2.236.24 – 10.2.236.25	10.2.236.25
14	10.2.236.26/31	10.2.236.26 – 10.2.236.27	10.2.236.27
15	10.2.236.28/31	10.2.236.28 – 10.2.236.29	10.2.236.29
16	10.2.236.30/31	10.2.236.30 – 10.2.236.31	10.2.236.31
17	10.2.236.32/31	10.2.236.32 – 10.2.236.33	10.2.236.33
18	10.2.236.34/31	10.2.236.34 – 10.2.236.35	10.2.236.35
19	10.2.236.36/31	10.2.236.36 – 10.2.236.37	10.2.236.37
20	10.2.236.38/31	10.2.236.38 – 10.2.236.39	10.2.236.39
21	10.2.236.40/31	10.2.236.40 – 10.2.236.41	10.2.236.41
22	10.2.236.42/31	10.2.236.42 – 10.2.236.43	10.2.236.43
23	10.2.236.44/31	10.2.236.44 – 10.2.236.45	10.2.236.45
24	10.2.236.46/31	10.2.236.46 – 10.2.236.47	10.2.236.47
25	10.2.236.48/31	10.2.236.48 – 10.2.236.49	10.2.236.49
26	10.2.236.50/31	10.2.236.50 – 10.2.236.51	10.2.236.51
27	10.2.236.52/31	10.2.236.52 – 10.2.236.53	10.2.236.53
28	10.2.236.54/31	10.2.236.54 – 10.2.236.55	10.2.236.55
29	10.2.236.56/31	10.2.236.56 – 10.2.236.57	10.2.236.57
30	10.2.236.58/31	10.2.236.58 – 10.2.236.59	10.2.236.59
31	10.2.236.60/31	10.2.236.60 – 10.2.236.61	10.2.236.61
32	10.2.236.62/31	10.2.236.62 – 10.2.236.63	10.2.236.63
33	10.2.236.64/31	10.2.236.64 – 10.2.236.65	10.2.236.65
34	10.2.236.66/31	10.2.236.66 – 10.2.236.67	10.2.236.67
35	10.2.236.68/31	10.2.236.68 – 10.2.236.69	10.2.236.69
36	10.2.236.70/31	10.2.236.70 – 10.2.236.71	10.2.236.71
37	10.2.236.72/31	10.2.236.72 – 10.2.236.73	10.2.236.73
38	10.2.236.74/31	10.2.236.74 – 10.2.236.75	10.2.236.75
39	10.2.236.76/31	10.2.236.76 – 10.2.236.77	10.2.236.77
40	10.2.236.78/31	10.2.236.78 – 10.2.236.79	10.2.236.79
41	10.2.236.80/31	10.2.236.80 – 10.2.236.81	10.2.236.81
42	10.2.236.82/31	10.2.236.82 – 10.2.236.83	10.2.236.83
43	10.2.236.84/31	10.2.236.84 – 10.2.236.85	10.2.236.85
44	10.2.236.86/31	10.2.236.86 – 10.2.236.87	10.2.236.87
45	10.2.236.88/31	10.2.236.88 – 10.2.236.89	10.2.236.89
46	10.2.236.90/31	10.2.236.90 – 10.2.236.91	10.2.236.91
47	10.2.236.92/31	10.2.236.92 – 10.2.236.93	10.2.236.93
48	10.2.236.94/31	10.2.236.94 – 10.2.236.95	10.2.236.95
49	10.2.236.96/31	10.2.236.96 – 10.2.236.97	10.2.236.97
50	10.2.236.98/31	10.2.236.98 – 10.2.236.99	10.2.236.99
51	10.2.236.100/31	10.2.236.100 – 10.2.236.101	10.2.236.101
52	10.2.236.102/31	10.2.236.102 – 10.2.236.103	10.2.236.103
53	10.2.236.104/31	10.2.236.104 – 10.2.236.105	10.2.236.105
54	10.2.236.106/31	10.2.236.106 – 10.2.236.107	10.2.236.107
55	10.2.236.108/31	10.2.236.108 – 10.2.236.109	10.2.236.109
56	10.2.236.110/31	10.2.236.110 – 10.2.236.111	10.2.236.111
57	10.2.236.112/31	10.2.236.112 – 10.2.236.113	10.2.236.113
58	10.2.236.114/31	10.2.236.114 – 10.2.236.115	10.2.236.115
59	10.2.236.116/31	10.2.236.116 – 10.2.236.117	10.2.236.117
60	10.2.236.118/31	10.2.236.118 – 10.2.236.119	10.2.236.119
61	10.2.236.120/31	10.2.236.120 – 10.2.236.121	10.2.236.121
62	10.2.236.122/31	10.2.236.122 – 10.2.236.123	10.2.236.123
63	10.2.236.124/31	10.2.236.124 – 10.2.236.125	10.2.236.125
64	10.2.236.126/31	10.2.236.126 – 10.2.236.127	10.2.236.127
65	10.2.236.128/31	10.2.236.128 – 10.2.236.129	10.2.236.129
66	10.2.236.130/31	10.2.236.130 – 10.2.236.131	10.2.236.131
67	10.2.236.132/31	10.2.236.132 – 10.2.236.133	10.2.236.133
68	10.2.236.134/31	10.2.236.134 – 10.2.236.135	10.2.236.135
69	10.2.236.136/31	10.2.236.136 – 10.2.236.137	10.2.236.137
70	10.2.236.138/31	10.2.236.138 – 10.2.236.139	10.2.236.139
71	10.2.236.140/31	10.2.236.140 – 10.2.236.141	10.2.236.141
72	10.2.236.142/31	10.2.236.142 – 10.2.236.143	10.2.236.143
73	10.2.236.144/31	10.2.236.144 – 10.2.236.145	10.2.236.145
74	10.2.236.146/31	10.2.236.146 – 10.2.236.147	10.2.236.147
75	10.2.236.148/31	10.2.236.148 – 10.2.236.149	10.2.236.149
76	10.2.236.150/31	10.2.236.150 – 10.2.236.151	10.2.236.151
77	10.2.236.152/31	10.2.236.152 – 10.2.236.153	10.2.236.153
78	10.2.236.154/31	10.2.236.154 – 10.2.236.155	10.2.236.155
79	10.2.236.156/31	10.2.236.156 – 10.2.236.157	10.2.236.157
80	10.2.236.158/31	10.2.236.158 – 10.2.236.159	10.2.236.159
81	10.2.236.160/31	10.2.236.160 – 10.2.236.161	10.2.236.161
82	10.2.236.162/31	10.2.236.162 – 10.2.236.163	10.2.236.163
83	10.2.236.164/31	10.2.236.164 – 10.2.236.165	10.2.236.165
84	10.2.236.166/31	10.2.236.166 – 10.2.236.167	10.2.236.167
85	10.2.236.168/31	10.2.236.168 – 10.2.236.169	10.2.236.169
86	10.2.236.170/31	10.2.236.170 – 10.2.236.171	10.2.236.171
87	10.2.236.172/31	10.2.236.172 – 10.2.236.173	10.2.236.173
88	10.2.236.174/31	10.2.236.174 – 10.2.236.175	10.2.236.175
89	10.2.236.176/31	10.2.236.176 – 10.2.236.177	10.2.236.177
90	10.2.236.178/31	10.2.236.178 – 10.2.236.179	10.2.236.179
91	10.2.236.180/31	10.2.236.180 – 10.2.236.181	10.2.236.181
92	10.2.236.182/31	10.2.236.182 – 10.2.236.183	10.2.236.183
93	10.2.236.184/31	10.2.236.184 – 10.2.236.185	10.2.236.185
94	10.2.236.186/31	10.2.236.186 – 10.2.236.187	10.2.236.187
95	10.2.236.188/31	10.2.236.188 – 10.2.236.189	10.2.236.189
96	10.2.236.190/31	10.2.236.190 – 10.2.236.191	10.2.236.191
97	10.2.236.192/31	10.2.236.192 – 10.2.236.193	10.2.236.193
98	10.2.236.194/31	10.2.236.194 – 10.2.236.195	10.2.236.195
99	10.2.236.196/31	10.2.236.196 – 10.2.236.197	10.2.236.197
100	10.2.236.198/31	10.2.236.198 – 10.2.236.199	10.2.236.199
101	10.2.236.200/31	10.2.236.200 – 10.2.236.201	10.2.236.201
102	10.2.236.202/31	10.2.236.202 – 10.2.236.203	10.2.236.203
103	10.2.236.204/31	10.2.236.204 – 10.2.236.205	10.2.236.205
104	10.2.236.206/31	10.2.236.206 – 10.2.236.207	10.2.236.207
105	10.2.236.208/31	10.2.236.208 – 10.2.236.209	10.2.236.209
106	10.2.236.210/31	10.2.236.210 – 10.2.236.211	10.2.236.211
107	10.2.236.212/31	10.2.236.212 – 10.2.236.213	10.2.236.213
108	10.2.236.214/31	10.2.236.214 – 10.2.236.215	10.2.236.215
109	10.2.236.216/31	10.2.236.216 – 10.2.236.217	10.2.236.217
110	10.2.236.218/31	10.2.236.218 – 10.2.236.219	10.2.236.219
111	10.2.236.220/31	10.2.236.220 – 10.2.236.221	10.2.236.221
112	10.2.236.222/31	10.2.236.222 – 10.2.236.223	10.2.236.223
113	10.2.236.224/31	10.2.236.224 – 10.2.236.225	10.2.236.225
114	10.2.236.226/31	10.2.236.226 – 10.2.236.227	10.2.236.227
115	10.2.236.228/31	10.2.236.228 – 10.2.236.229	10.2.236.229
116	10.2.236.230/31	10.2.236.230 – 10.2.236.231	10.2.236.231
117	10.2.236.232/31	10.2.236.232 – 10.2.236.233	10.2.236.233
118	10.2.236.234/31	10.2.236.234 – 10.2.236.235	10.2.236.235
119	10.2.236.236/31	10.2.236.236 – 10.2.236.237	10.2.236.237
120	10.2.236.238/31	10.2.236.238 – 10.2.236.239	10.2.236.239
121	10.2.236.240/31	10.2.236.240 – 10.2.236.241	10.2.236.241
122	10.2.236.242/31	10.2.236.242 – 10.2.236.243	10.2.236.243
123	10.2.236.244/31	10.2.236.244 – 10.2.236.245	10.2.236.245
124	10.2.236.246/31	10.2.236.246 – 10.2.236.247	10.2.236.247
125	10.2.236.248/31	10.2.236.248 – 10.2.236.249	10.2.236.249
126	10.2.236.250/31	10.2.236.250 – 10.2.236.251	10.2.236.251
127	10.2.236.252/31	10.2.236.252 – 10.2.236.253	10.2.236.253
128	10.2.236.254/31	10.2.236.254 – 10.2.236.255	10.2.236.255
129	10.2.237.0/31	10.2.237.0 – 10.2.237.1	10.2.237.1
130	10.2.237.2/31	10.2.237.2 – 10.2.237.3	10.2.237.3
131	10.2.237.4/31	10.2.237.4 – 10.2.237.5	10.2.237.5
132	10.2.237.6/31	10.2.237.6 – 10.2.237.7	10.2.237.7
133	10.2.237.8/31	10.2.237.8 – 10.2.237.9	10.2.237.9
134	10.2.237.10/31	10.2.237.10 – 10.2.237.11	10.2.237.11
135	10.2.237.12/31	10.2.237.12 – 10.2.237.13	10.2.237.13
136	10.2.237.14/31	10.2.237.14 – 10.2.237.15	10.2.237.15
137	10.2.237.16/31	10.2.237.16 – 10.2.237.17	10.2.237.17
138	10.2.237.18/31	10.2.237.18 – 10.2.237.19	10.2.237.19
139	10.2.237.20/31	10.2.237.20 – 10.2.237.21	10.2.237.21
140	10.2.237.22/31	10.2.237.22 – 10.2.237.23	10.2.237.23
141	10.2.237.24/31	10.2.237.24 – 10.2.237.25	10.2.237.25
142	10.2.237.26/31	10.2.237.26 – 10.2.237.27	10.2.237.27
143	10.2.237.28/31	10.2.237.28 – 10.2.237.29	10.2.237.29
144	10.2.237.30/31	10.2.237.30 – 10.2.237.31	10.2.237.31
145	10.2.237.32/31	10.2.237.32 – 10.2.237.33	10.2.237.33
146	10.2.237.34/31	10.2.237.34 – 10.2.237.35	10.2.237.35
147	10.2.237.36/31	10.2.237.36 – 10.2.237.37	10.2.237.37
148	10.2.237.38/31	10.2.237.38 – 10.2.237.39	10.2.237.39
149	10.2.237.40/31	10.2.237.40 – 10.2.237.41	10.2.237.41
150	10.2.237.42/31	10.2.237.42 – 10.2.237.43	10.2.237.43
151	10.2.237.44/31	10.2.237.44 – 10.2.237.45	10.2.237.45
152	10.2.237.46/31	10.2.237.46 – 10.2.237.47	10.2.237.47
153	10.2.237.48/31	10.2.237.48 – 10.2.237.49	10.2.237.49
154	10.2.237.50/31	10.2.237.50 – 10.2.237.51	10.2.237.51
155	10.2.237.52/31	10.2.237.52 – 10.2.237.53	10.2.237.53
156	10.2.237.54/31	10.2.237.54 – 10.2.237.55	10.2.237.55
157	10.2.237.56/31	10.2.237.56 – 10.2.237.57	10.2.237.57
158	10.2.237.58/31	10.2.237.58 – 10.2.237.59	10.2.237.59
159	10.2.237.60/31	10.2.237.60 – 10.2.237.61	10.2.237.61
160	10.2.237.62/31	10.2.237.62 – 10.2.237.63	10.2.237.63
161	10.2.237.64/31	10.2.237.64 – 10.2.237.65	10.2.237.65
162	10.2.237.66/31	10.2.237.66 – 10.2.237.67	10.2.237.67
163	10.2.237.68/31	10.2.237.68 – 10.2.237.69	10.2.237.69
164	10.2.237.70/31	10.2.237.70 – 10.2.237.71	10.2.237.71
165	10.2.237.72/31	10.2.237.72 – 10.2.237.73	10.2.237.73
166	10.2.237.74/31	10.2.237.74 – 10.2.237.75	10.2.237.75
167	10.2.237.76/31	10.2.237.76 – 10.2.237.77	10.2.237.77
168	10.2.237.78/31	10.2.237.78 – 10.2.237.79	10.2.237.79
169	10.2.237.80/31	10.2.237.80 – 10.2.237.81	10.2.237.81
170	10.2.237.82/31	10.2.237.82 – 10.2.237.83	10.2.237.83
171	10.2.237.84/31	10.2.237.84 – 10.2.237.85	10.2.237.85
172	10.2.237.86/31	10.2.237.86 – 10.2.237.87	10.2.237.87
173	10.2.237.88/31	10.2.237.88 – 10.2.237.89	10.2.237.89
174	10.2.237.90/31	10.2.237.90 – 10.2.237.91	10.2.237.91
175	10.2.237.92/31	10.2.237.92 – 10.2.237.93	10.2.237.93
176	10.2.237.94/31	10.2.237.94 – 10.2.237.95	10.2.237.95
177	10.2.237.96/31	10.2.237.96 – 10.2.237.97	10.2.237.97
178	10.2.237.98/31	10.2.237.98 – 10.2.237.99	10.2.237.99
179	10.2.237.100/31	10.2.237.100 – 10.2.237.101	10.2.237.101
180	10.2.237.102/31	10.2.237.102 – 10.2.237.103	10.2.237.103
181	10.2.237.104/31	10.2.237.104 – 10.2.237.105	10.2.237.105
182	10.2.237.106/31	10.2.237.106 – 10.2.237.107	10.2.237.107
183	10.2.237.108/31	10.2.237.108 – 10.2.237.109	10.2.237.109
184	10.2.237.110/31	10.2.237.110 – 10.2.237.111	10.2.237.111
185	10.2.237.112/31	10.2.237.112 – 10.2.237.113	10.2.237.113
186	10.2.237.114/31	10.2.237.114 – 10.2.237.115	10.2.237.115
187	10.2.237.116/31	10.2.237.116 – 10.2.237.117	10.2.237.117
188	10.2.237.118/31	10.2.237.118 – 10.2.237.119	10.2.237.119
189	10.2.237.120/31	10.2.237.120 – 10.2.237.121	10.2.237.121
190	10.2.237.122/31	10.2.237.122 – 10.2.237.123	10.2.237.123
191	10.2.237.124/31	10.2.237.124 – 10.2.237.125	10.2.237.125
192	10.2.237.126/31	10.2.237.126 – 10.2.237.127	10.2.237.127
193	10.2.237.128/31	10.2.237.128 – 10.2.237.129	10.2.237.129
194	10.2.237.130/31	10.2.237.130 – 10.2.237.131	10.2.237.131
195	10.2.237.132/31	10.2.237.132 – 10.2.237.133	10.2.237.133
196	10.2.237.134/31	10.2.237.134 – 10.2.237.135	10.2.237.135
197	10.2.237.136/31	10.2.237.136 – 10.2.237.137	10.2.237.137
198	10.2.237.138/31	10.2.237.138 – 10.2.237.139	10.2.237.139
199	10.2.237.140/31	10.2.237.140 – 10.2.237.141	10.2.237.141
200	10.2.237.142/31	10.2.237.142 – 10.2.237.143	10.2.237.143
201	10.2.237.144/31	10.2.237.144 – 10.2.237.145	10.2.237.145
202	10.2.237.146/31	10.2.237.146 – 10.2.237.147	10.2.237.147
203	10.2.237.148/31	10.2.237.148 – 10.2.237.149	10.2.237.149
204	10.2.237.150/31	10.2.237.150 – 10.2.237.151	10.2.237.151
205	10.2.237.152/31	10.2.237.152 – 10.2.237.153	10.2.237.153
206	10.2.237.154/31	10.2.237.154 – 10.2.237.155	10.2.237.155
207	10.2.237.156/31	10.2.237.156 – 10.2.237.157	10.2.237.157
208	10.2.237.158/31	10.2.237.158 – 10.2.237.159	10.2.237.159
209	10.2.237.160/31	10.2.237.160 – 10.2.237.161	10.2.237.161
210	10.2.237.162/31	10.2.237.162 – 10.2.237.163	10.2.237.163
211	10.2.237.164/31	10.2.237.164 – 10.2.237.165	10.2.237.165
212	10.2.237.166/31	10.2.237.166 – 10.2.237.167	10.2.237.167
213	10.2.237.168/31	10.2.237.168 – 10.2.237.169	10.2.237.169
214	10.2.237.170/31	10.2.237.170 – 10.2.237.171	10.2.237.171
215	10.2.237.172/31	10.2.237.172 – 10.2.237.173	10.2.237.173
216	10.2.237.174/31	10.2.237.174 – 10.2.237.175	10.2.237.175
217	10.2.237.176/31	10.2.237.176 – 10.2.237.177	10.2.237.177
218	10.2.237.178/31	10.2.237.178 – 10.2.237.179	10.2.237.179
219	10.2.237.180/31	10.2.237.180 – 10.2.237.181	10.2.237.181
220	10.2.237.182/31	10.2.237.182 – 10.2.237.183	10.2.237.183
221	10.2.237.184/31	10.2.237.184 – 10.2.237.185	10.2.237.185
222	10.2.237.186/31	10.2.237.186 – 10.2.237.187	10.2.237.187
223	10.2.237.188/31	10.2.237.188 – 10.2.237.189	10.2.237.189
224	10.2.237.190/31	10.2.237.190 – 10.2.237.191	10.2.237.191
225	10.2.237.192/31	10.2.237.192 – 10.2.237.193	10.2.237.193
226	10.2.237.194/31	10.2.237.194 – 10.2.237.195	10.2.237.195
227	10.2.237.196/31	10.2.237.196 – 10.2.237.197	10.2.237.197
228	10.2.237.198/31	10.2.237.198 – 10.2.237.199	10.2.237.199
229	10.2.237.200/31	10.2.237.200 – 10.2.237.201	10.2.237.201
230	10.2.237.202/31	10.2.237.202 – 10.2.237.203	10.2.237.203
231	10.2.237.204/31	10.2.237.204 – 10.2.237.205	10.2.237.205
232	10.2.237.206/31	10.2.237.206 – 10.2.237.207	10.2.237.207
233	10.2.237.208/31	10.2.237.208 – 10.2.237.209	10.2.237.209
234	10.2.237.210/31	10.2.237.210 – 10.2.237.211	10.2.237.211
235	10.2.237.212/31	10.2.237.212 – 10.2.237.213	10.2.237.213
236	10.2.237.214/31	10.2.237.214 – 10.2.237.215	10.2.237.215
237	10.2.237.216/31	10.2.237.216 – 10.2.237.217	10.2.237.217
238	10.2.237.218/31	10.2.237.218 – 10.2.237.219	10.2.237.219
239	10.2.237.220/31	10.2.237.220 – 10.2.237.221	10.2.237.221
240	10.2.237.222/31	10.2.237.222 – 10.2.237.223	10.2.237.223
241	10.2.237.224/31	10.2.237.224 – 10.2.237.225	10.2.237.225
242	10.2.237.226/31	10.2.237.226 – 10.2.237.227	10.2.237.227
243	10.2.237.228/31	10.2.237.228 – 10.2.237.229	10.2.237.229
244	10.2.237.230/31	10.2.237.230 – 10.2.237.231	10.2.237.231
245	10.2.237.232/31	10.2.237.232 – 10.2.237.233	10.2.237.233
246	10.2.237.234/31	10.2.237.234 – 10.2.237.235	10.2.237.235
247	10.2.237.236/31	10.2.237.236 – 10.2.237.237	10.2.237.237
248	10.2.237.238/31	10.2.237.238 – 10.2.237.239	10.2.237.239
249	10.2.237.240/31	10.2.237.240 – 10.2.237.241	10.2.237.241
250	10.2.237.242/31	10.2.237.242 – 10.2.237.243	10.2.237.243
251	10.2.237.244/31	10.2.237.244 – 10.2.237.245	10.2.237.245
252	10.2.237.246/31	10.2.237.246 – 10.2.237.247	10.2.237.247
253	10.2.237.248/31	10.2.237.248 – 10.2.237.249	10.2.237.249
254	10.2.237.250/31	10.2.237.250 – 10.2.237.251	10.2.237.251
255	10.2.237.252/31	10.2.237.252 – 10.2.237.253	10.2.237.253
256	10.2.237.254/31	10.2.237.254 – 10.2.237.255	10.2.237.255

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 →