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)10.205.2.0/23

network10.205.2.0/23

broadcast10.205.3.255

first host10.205.2.1

last host10.205.3.254

subnet mask255.255.254.0

wildcard0.0.1.255

addresses512

usable hosts510

classA

ipcalc 10.205.2.0/23

address00001010.11001101.00000010.00000000

subnet mask11111111.11111111.11111110.00000000

network00001010.11001101.00000010.00000000

broadcast00001010.11001101.00000011.11111111

green = network part, grey = host part

hex0x0acd0200

decimal181207552

reverse dns0.2.205.10.in-addr.arpa

ipv4-mapped::ffff:acd:200

/23 split into /31 · 256 subnets

close ×

#	network	host range	broadcast
1	10.205.2.0/31	10.205.2.0 – 10.205.2.1	10.205.2.1
2	10.205.2.2/31	10.205.2.2 – 10.205.2.3	10.205.2.3
3	10.205.2.4/31	10.205.2.4 – 10.205.2.5	10.205.2.5
4	10.205.2.6/31	10.205.2.6 – 10.205.2.7	10.205.2.7
5	10.205.2.8/31	10.205.2.8 – 10.205.2.9	10.205.2.9
6	10.205.2.10/31	10.205.2.10 – 10.205.2.11	10.205.2.11
7	10.205.2.12/31	10.205.2.12 – 10.205.2.13	10.205.2.13
8	10.205.2.14/31	10.205.2.14 – 10.205.2.15	10.205.2.15
9	10.205.2.16/31	10.205.2.16 – 10.205.2.17	10.205.2.17
10	10.205.2.18/31	10.205.2.18 – 10.205.2.19	10.205.2.19
11	10.205.2.20/31	10.205.2.20 – 10.205.2.21	10.205.2.21
12	10.205.2.22/31	10.205.2.22 – 10.205.2.23	10.205.2.23
13	10.205.2.24/31	10.205.2.24 – 10.205.2.25	10.205.2.25
14	10.205.2.26/31	10.205.2.26 – 10.205.2.27	10.205.2.27
15	10.205.2.28/31	10.205.2.28 – 10.205.2.29	10.205.2.29
16	10.205.2.30/31	10.205.2.30 – 10.205.2.31	10.205.2.31
17	10.205.2.32/31	10.205.2.32 – 10.205.2.33	10.205.2.33
18	10.205.2.34/31	10.205.2.34 – 10.205.2.35	10.205.2.35
19	10.205.2.36/31	10.205.2.36 – 10.205.2.37	10.205.2.37
20	10.205.2.38/31	10.205.2.38 – 10.205.2.39	10.205.2.39
21	10.205.2.40/31	10.205.2.40 – 10.205.2.41	10.205.2.41
22	10.205.2.42/31	10.205.2.42 – 10.205.2.43	10.205.2.43
23	10.205.2.44/31	10.205.2.44 – 10.205.2.45	10.205.2.45
24	10.205.2.46/31	10.205.2.46 – 10.205.2.47	10.205.2.47
25	10.205.2.48/31	10.205.2.48 – 10.205.2.49	10.205.2.49
26	10.205.2.50/31	10.205.2.50 – 10.205.2.51	10.205.2.51
27	10.205.2.52/31	10.205.2.52 – 10.205.2.53	10.205.2.53
28	10.205.2.54/31	10.205.2.54 – 10.205.2.55	10.205.2.55
29	10.205.2.56/31	10.205.2.56 – 10.205.2.57	10.205.2.57
30	10.205.2.58/31	10.205.2.58 – 10.205.2.59	10.205.2.59
31	10.205.2.60/31	10.205.2.60 – 10.205.2.61	10.205.2.61
32	10.205.2.62/31	10.205.2.62 – 10.205.2.63	10.205.2.63
33	10.205.2.64/31	10.205.2.64 – 10.205.2.65	10.205.2.65
34	10.205.2.66/31	10.205.2.66 – 10.205.2.67	10.205.2.67
35	10.205.2.68/31	10.205.2.68 – 10.205.2.69	10.205.2.69
36	10.205.2.70/31	10.205.2.70 – 10.205.2.71	10.205.2.71
37	10.205.2.72/31	10.205.2.72 – 10.205.2.73	10.205.2.73
38	10.205.2.74/31	10.205.2.74 – 10.205.2.75	10.205.2.75
39	10.205.2.76/31	10.205.2.76 – 10.205.2.77	10.205.2.77
40	10.205.2.78/31	10.205.2.78 – 10.205.2.79	10.205.2.79
41	10.205.2.80/31	10.205.2.80 – 10.205.2.81	10.205.2.81
42	10.205.2.82/31	10.205.2.82 – 10.205.2.83	10.205.2.83
43	10.205.2.84/31	10.205.2.84 – 10.205.2.85	10.205.2.85
44	10.205.2.86/31	10.205.2.86 – 10.205.2.87	10.205.2.87
45	10.205.2.88/31	10.205.2.88 – 10.205.2.89	10.205.2.89
46	10.205.2.90/31	10.205.2.90 – 10.205.2.91	10.205.2.91
47	10.205.2.92/31	10.205.2.92 – 10.205.2.93	10.205.2.93
48	10.205.2.94/31	10.205.2.94 – 10.205.2.95	10.205.2.95
49	10.205.2.96/31	10.205.2.96 – 10.205.2.97	10.205.2.97
50	10.205.2.98/31	10.205.2.98 – 10.205.2.99	10.205.2.99
51	10.205.2.100/31	10.205.2.100 – 10.205.2.101	10.205.2.101
52	10.205.2.102/31	10.205.2.102 – 10.205.2.103	10.205.2.103
53	10.205.2.104/31	10.205.2.104 – 10.205.2.105	10.205.2.105
54	10.205.2.106/31	10.205.2.106 – 10.205.2.107	10.205.2.107
55	10.205.2.108/31	10.205.2.108 – 10.205.2.109	10.205.2.109
56	10.205.2.110/31	10.205.2.110 – 10.205.2.111	10.205.2.111
57	10.205.2.112/31	10.205.2.112 – 10.205.2.113	10.205.2.113
58	10.205.2.114/31	10.205.2.114 – 10.205.2.115	10.205.2.115
59	10.205.2.116/31	10.205.2.116 – 10.205.2.117	10.205.2.117
60	10.205.2.118/31	10.205.2.118 – 10.205.2.119	10.205.2.119
61	10.205.2.120/31	10.205.2.120 – 10.205.2.121	10.205.2.121
62	10.205.2.122/31	10.205.2.122 – 10.205.2.123	10.205.2.123
63	10.205.2.124/31	10.205.2.124 – 10.205.2.125	10.205.2.125
64	10.205.2.126/31	10.205.2.126 – 10.205.2.127	10.205.2.127
65	10.205.2.128/31	10.205.2.128 – 10.205.2.129	10.205.2.129
66	10.205.2.130/31	10.205.2.130 – 10.205.2.131	10.205.2.131
67	10.205.2.132/31	10.205.2.132 – 10.205.2.133	10.205.2.133
68	10.205.2.134/31	10.205.2.134 – 10.205.2.135	10.205.2.135
69	10.205.2.136/31	10.205.2.136 – 10.205.2.137	10.205.2.137
70	10.205.2.138/31	10.205.2.138 – 10.205.2.139	10.205.2.139
71	10.205.2.140/31	10.205.2.140 – 10.205.2.141	10.205.2.141
72	10.205.2.142/31	10.205.2.142 – 10.205.2.143	10.205.2.143
73	10.205.2.144/31	10.205.2.144 – 10.205.2.145	10.205.2.145
74	10.205.2.146/31	10.205.2.146 – 10.205.2.147	10.205.2.147
75	10.205.2.148/31	10.205.2.148 – 10.205.2.149	10.205.2.149
76	10.205.2.150/31	10.205.2.150 – 10.205.2.151	10.205.2.151
77	10.205.2.152/31	10.205.2.152 – 10.205.2.153	10.205.2.153
78	10.205.2.154/31	10.205.2.154 – 10.205.2.155	10.205.2.155
79	10.205.2.156/31	10.205.2.156 – 10.205.2.157	10.205.2.157
80	10.205.2.158/31	10.205.2.158 – 10.205.2.159	10.205.2.159
81	10.205.2.160/31	10.205.2.160 – 10.205.2.161	10.205.2.161
82	10.205.2.162/31	10.205.2.162 – 10.205.2.163	10.205.2.163
83	10.205.2.164/31	10.205.2.164 – 10.205.2.165	10.205.2.165
84	10.205.2.166/31	10.205.2.166 – 10.205.2.167	10.205.2.167
85	10.205.2.168/31	10.205.2.168 – 10.205.2.169	10.205.2.169
86	10.205.2.170/31	10.205.2.170 – 10.205.2.171	10.205.2.171
87	10.205.2.172/31	10.205.2.172 – 10.205.2.173	10.205.2.173
88	10.205.2.174/31	10.205.2.174 – 10.205.2.175	10.205.2.175
89	10.205.2.176/31	10.205.2.176 – 10.205.2.177	10.205.2.177
90	10.205.2.178/31	10.205.2.178 – 10.205.2.179	10.205.2.179
91	10.205.2.180/31	10.205.2.180 – 10.205.2.181	10.205.2.181
92	10.205.2.182/31	10.205.2.182 – 10.205.2.183	10.205.2.183
93	10.205.2.184/31	10.205.2.184 – 10.205.2.185	10.205.2.185
94	10.205.2.186/31	10.205.2.186 – 10.205.2.187	10.205.2.187
95	10.205.2.188/31	10.205.2.188 – 10.205.2.189	10.205.2.189
96	10.205.2.190/31	10.205.2.190 – 10.205.2.191	10.205.2.191
97	10.205.2.192/31	10.205.2.192 – 10.205.2.193	10.205.2.193
98	10.205.2.194/31	10.205.2.194 – 10.205.2.195	10.205.2.195
99	10.205.2.196/31	10.205.2.196 – 10.205.2.197	10.205.2.197
100	10.205.2.198/31	10.205.2.198 – 10.205.2.199	10.205.2.199
101	10.205.2.200/31	10.205.2.200 – 10.205.2.201	10.205.2.201
102	10.205.2.202/31	10.205.2.202 – 10.205.2.203	10.205.2.203
103	10.205.2.204/31	10.205.2.204 – 10.205.2.205	10.205.2.205
104	10.205.2.206/31	10.205.2.206 – 10.205.2.207	10.205.2.207
105	10.205.2.208/31	10.205.2.208 – 10.205.2.209	10.205.2.209
106	10.205.2.210/31	10.205.2.210 – 10.205.2.211	10.205.2.211
107	10.205.2.212/31	10.205.2.212 – 10.205.2.213	10.205.2.213
108	10.205.2.214/31	10.205.2.214 – 10.205.2.215	10.205.2.215
109	10.205.2.216/31	10.205.2.216 – 10.205.2.217	10.205.2.217
110	10.205.2.218/31	10.205.2.218 – 10.205.2.219	10.205.2.219
111	10.205.2.220/31	10.205.2.220 – 10.205.2.221	10.205.2.221
112	10.205.2.222/31	10.205.2.222 – 10.205.2.223	10.205.2.223
113	10.205.2.224/31	10.205.2.224 – 10.205.2.225	10.205.2.225
114	10.205.2.226/31	10.205.2.226 – 10.205.2.227	10.205.2.227
115	10.205.2.228/31	10.205.2.228 – 10.205.2.229	10.205.2.229
116	10.205.2.230/31	10.205.2.230 – 10.205.2.231	10.205.2.231
117	10.205.2.232/31	10.205.2.232 – 10.205.2.233	10.205.2.233
118	10.205.2.234/31	10.205.2.234 – 10.205.2.235	10.205.2.235
119	10.205.2.236/31	10.205.2.236 – 10.205.2.237	10.205.2.237
120	10.205.2.238/31	10.205.2.238 – 10.205.2.239	10.205.2.239
121	10.205.2.240/31	10.205.2.240 – 10.205.2.241	10.205.2.241
122	10.205.2.242/31	10.205.2.242 – 10.205.2.243	10.205.2.243
123	10.205.2.244/31	10.205.2.244 – 10.205.2.245	10.205.2.245
124	10.205.2.246/31	10.205.2.246 – 10.205.2.247	10.205.2.247
125	10.205.2.248/31	10.205.2.248 – 10.205.2.249	10.205.2.249
126	10.205.2.250/31	10.205.2.250 – 10.205.2.251	10.205.2.251
127	10.205.2.252/31	10.205.2.252 – 10.205.2.253	10.205.2.253
128	10.205.2.254/31	10.205.2.254 – 10.205.2.255	10.205.2.255
129	10.205.3.0/31	10.205.3.0 – 10.205.3.1	10.205.3.1
130	10.205.3.2/31	10.205.3.2 – 10.205.3.3	10.205.3.3
131	10.205.3.4/31	10.205.3.4 – 10.205.3.5	10.205.3.5
132	10.205.3.6/31	10.205.3.6 – 10.205.3.7	10.205.3.7
133	10.205.3.8/31	10.205.3.8 – 10.205.3.9	10.205.3.9
134	10.205.3.10/31	10.205.3.10 – 10.205.3.11	10.205.3.11
135	10.205.3.12/31	10.205.3.12 – 10.205.3.13	10.205.3.13
136	10.205.3.14/31	10.205.3.14 – 10.205.3.15	10.205.3.15
137	10.205.3.16/31	10.205.3.16 – 10.205.3.17	10.205.3.17
138	10.205.3.18/31	10.205.3.18 – 10.205.3.19	10.205.3.19
139	10.205.3.20/31	10.205.3.20 – 10.205.3.21	10.205.3.21
140	10.205.3.22/31	10.205.3.22 – 10.205.3.23	10.205.3.23
141	10.205.3.24/31	10.205.3.24 – 10.205.3.25	10.205.3.25
142	10.205.3.26/31	10.205.3.26 – 10.205.3.27	10.205.3.27
143	10.205.3.28/31	10.205.3.28 – 10.205.3.29	10.205.3.29
144	10.205.3.30/31	10.205.3.30 – 10.205.3.31	10.205.3.31
145	10.205.3.32/31	10.205.3.32 – 10.205.3.33	10.205.3.33
146	10.205.3.34/31	10.205.3.34 – 10.205.3.35	10.205.3.35
147	10.205.3.36/31	10.205.3.36 – 10.205.3.37	10.205.3.37
148	10.205.3.38/31	10.205.3.38 – 10.205.3.39	10.205.3.39
149	10.205.3.40/31	10.205.3.40 – 10.205.3.41	10.205.3.41
150	10.205.3.42/31	10.205.3.42 – 10.205.3.43	10.205.3.43
151	10.205.3.44/31	10.205.3.44 – 10.205.3.45	10.205.3.45
152	10.205.3.46/31	10.205.3.46 – 10.205.3.47	10.205.3.47
153	10.205.3.48/31	10.205.3.48 – 10.205.3.49	10.205.3.49
154	10.205.3.50/31	10.205.3.50 – 10.205.3.51	10.205.3.51
155	10.205.3.52/31	10.205.3.52 – 10.205.3.53	10.205.3.53
156	10.205.3.54/31	10.205.3.54 – 10.205.3.55	10.205.3.55
157	10.205.3.56/31	10.205.3.56 – 10.205.3.57	10.205.3.57
158	10.205.3.58/31	10.205.3.58 – 10.205.3.59	10.205.3.59
159	10.205.3.60/31	10.205.3.60 – 10.205.3.61	10.205.3.61
160	10.205.3.62/31	10.205.3.62 – 10.205.3.63	10.205.3.63
161	10.205.3.64/31	10.205.3.64 – 10.205.3.65	10.205.3.65
162	10.205.3.66/31	10.205.3.66 – 10.205.3.67	10.205.3.67
163	10.205.3.68/31	10.205.3.68 – 10.205.3.69	10.205.3.69
164	10.205.3.70/31	10.205.3.70 – 10.205.3.71	10.205.3.71
165	10.205.3.72/31	10.205.3.72 – 10.205.3.73	10.205.3.73
166	10.205.3.74/31	10.205.3.74 – 10.205.3.75	10.205.3.75
167	10.205.3.76/31	10.205.3.76 – 10.205.3.77	10.205.3.77
168	10.205.3.78/31	10.205.3.78 – 10.205.3.79	10.205.3.79
169	10.205.3.80/31	10.205.3.80 – 10.205.3.81	10.205.3.81
170	10.205.3.82/31	10.205.3.82 – 10.205.3.83	10.205.3.83
171	10.205.3.84/31	10.205.3.84 – 10.205.3.85	10.205.3.85
172	10.205.3.86/31	10.205.3.86 – 10.205.3.87	10.205.3.87
173	10.205.3.88/31	10.205.3.88 – 10.205.3.89	10.205.3.89
174	10.205.3.90/31	10.205.3.90 – 10.205.3.91	10.205.3.91
175	10.205.3.92/31	10.205.3.92 – 10.205.3.93	10.205.3.93
176	10.205.3.94/31	10.205.3.94 – 10.205.3.95	10.205.3.95
177	10.205.3.96/31	10.205.3.96 – 10.205.3.97	10.205.3.97
178	10.205.3.98/31	10.205.3.98 – 10.205.3.99	10.205.3.99
179	10.205.3.100/31	10.205.3.100 – 10.205.3.101	10.205.3.101
180	10.205.3.102/31	10.205.3.102 – 10.205.3.103	10.205.3.103
181	10.205.3.104/31	10.205.3.104 – 10.205.3.105	10.205.3.105
182	10.205.3.106/31	10.205.3.106 – 10.205.3.107	10.205.3.107
183	10.205.3.108/31	10.205.3.108 – 10.205.3.109	10.205.3.109
184	10.205.3.110/31	10.205.3.110 – 10.205.3.111	10.205.3.111
185	10.205.3.112/31	10.205.3.112 – 10.205.3.113	10.205.3.113
186	10.205.3.114/31	10.205.3.114 – 10.205.3.115	10.205.3.115
187	10.205.3.116/31	10.205.3.116 – 10.205.3.117	10.205.3.117
188	10.205.3.118/31	10.205.3.118 – 10.205.3.119	10.205.3.119
189	10.205.3.120/31	10.205.3.120 – 10.205.3.121	10.205.3.121
190	10.205.3.122/31	10.205.3.122 – 10.205.3.123	10.205.3.123
191	10.205.3.124/31	10.205.3.124 – 10.205.3.125	10.205.3.125
192	10.205.3.126/31	10.205.3.126 – 10.205.3.127	10.205.3.127
193	10.205.3.128/31	10.205.3.128 – 10.205.3.129	10.205.3.129
194	10.205.3.130/31	10.205.3.130 – 10.205.3.131	10.205.3.131
195	10.205.3.132/31	10.205.3.132 – 10.205.3.133	10.205.3.133
196	10.205.3.134/31	10.205.3.134 – 10.205.3.135	10.205.3.135
197	10.205.3.136/31	10.205.3.136 – 10.205.3.137	10.205.3.137
198	10.205.3.138/31	10.205.3.138 – 10.205.3.139	10.205.3.139
199	10.205.3.140/31	10.205.3.140 – 10.205.3.141	10.205.3.141
200	10.205.3.142/31	10.205.3.142 – 10.205.3.143	10.205.3.143
201	10.205.3.144/31	10.205.3.144 – 10.205.3.145	10.205.3.145
202	10.205.3.146/31	10.205.3.146 – 10.205.3.147	10.205.3.147
203	10.205.3.148/31	10.205.3.148 – 10.205.3.149	10.205.3.149
204	10.205.3.150/31	10.205.3.150 – 10.205.3.151	10.205.3.151
205	10.205.3.152/31	10.205.3.152 – 10.205.3.153	10.205.3.153
206	10.205.3.154/31	10.205.3.154 – 10.205.3.155	10.205.3.155
207	10.205.3.156/31	10.205.3.156 – 10.205.3.157	10.205.3.157
208	10.205.3.158/31	10.205.3.158 – 10.205.3.159	10.205.3.159
209	10.205.3.160/31	10.205.3.160 – 10.205.3.161	10.205.3.161
210	10.205.3.162/31	10.205.3.162 – 10.205.3.163	10.205.3.163
211	10.205.3.164/31	10.205.3.164 – 10.205.3.165	10.205.3.165
212	10.205.3.166/31	10.205.3.166 – 10.205.3.167	10.205.3.167
213	10.205.3.168/31	10.205.3.168 – 10.205.3.169	10.205.3.169
214	10.205.3.170/31	10.205.3.170 – 10.205.3.171	10.205.3.171
215	10.205.3.172/31	10.205.3.172 – 10.205.3.173	10.205.3.173
216	10.205.3.174/31	10.205.3.174 – 10.205.3.175	10.205.3.175
217	10.205.3.176/31	10.205.3.176 – 10.205.3.177	10.205.3.177
218	10.205.3.178/31	10.205.3.178 – 10.205.3.179	10.205.3.179
219	10.205.3.180/31	10.205.3.180 – 10.205.3.181	10.205.3.181
220	10.205.3.182/31	10.205.3.182 – 10.205.3.183	10.205.3.183
221	10.205.3.184/31	10.205.3.184 – 10.205.3.185	10.205.3.185
222	10.205.3.186/31	10.205.3.186 – 10.205.3.187	10.205.3.187
223	10.205.3.188/31	10.205.3.188 – 10.205.3.189	10.205.3.189
224	10.205.3.190/31	10.205.3.190 – 10.205.3.191	10.205.3.191
225	10.205.3.192/31	10.205.3.192 – 10.205.3.193	10.205.3.193
226	10.205.3.194/31	10.205.3.194 – 10.205.3.195	10.205.3.195
227	10.205.3.196/31	10.205.3.196 – 10.205.3.197	10.205.3.197
228	10.205.3.198/31	10.205.3.198 – 10.205.3.199	10.205.3.199
229	10.205.3.200/31	10.205.3.200 – 10.205.3.201	10.205.3.201
230	10.205.3.202/31	10.205.3.202 – 10.205.3.203	10.205.3.203
231	10.205.3.204/31	10.205.3.204 – 10.205.3.205	10.205.3.205
232	10.205.3.206/31	10.205.3.206 – 10.205.3.207	10.205.3.207
233	10.205.3.208/31	10.205.3.208 – 10.205.3.209	10.205.3.209
234	10.205.3.210/31	10.205.3.210 – 10.205.3.211	10.205.3.211
235	10.205.3.212/31	10.205.3.212 – 10.205.3.213	10.205.3.213
236	10.205.3.214/31	10.205.3.214 – 10.205.3.215	10.205.3.215
237	10.205.3.216/31	10.205.3.216 – 10.205.3.217	10.205.3.217
238	10.205.3.218/31	10.205.3.218 – 10.205.3.219	10.205.3.219
239	10.205.3.220/31	10.205.3.220 – 10.205.3.221	10.205.3.221
240	10.205.3.222/31	10.205.3.222 – 10.205.3.223	10.205.3.223
241	10.205.3.224/31	10.205.3.224 – 10.205.3.225	10.205.3.225
242	10.205.3.226/31	10.205.3.226 – 10.205.3.227	10.205.3.227
243	10.205.3.228/31	10.205.3.228 – 10.205.3.229	10.205.3.229
244	10.205.3.230/31	10.205.3.230 – 10.205.3.231	10.205.3.231
245	10.205.3.232/31	10.205.3.232 – 10.205.3.233	10.205.3.233
246	10.205.3.234/31	10.205.3.234 – 10.205.3.235	10.205.3.235
247	10.205.3.236/31	10.205.3.236 – 10.205.3.237	10.205.3.237
248	10.205.3.238/31	10.205.3.238 – 10.205.3.239	10.205.3.239
249	10.205.3.240/31	10.205.3.240 – 10.205.3.241	10.205.3.241
250	10.205.3.242/31	10.205.3.242 – 10.205.3.243	10.205.3.243
251	10.205.3.244/31	10.205.3.244 – 10.205.3.245	10.205.3.245
252	10.205.3.246/31	10.205.3.246 – 10.205.3.247	10.205.3.247
253	10.205.3.248/31	10.205.3.248 – 10.205.3.249	10.205.3.249
254	10.205.3.250/31	10.205.3.250 – 10.205.3.251	10.205.3.251
255	10.205.3.252/31	10.205.3.252 – 10.205.3.253	10.205.3.253
256	10.205.3.254/31	10.205.3.254 – 10.205.3.255	10.205.3.255

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 →