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)10.2.158.0/23

network10.2.158.0/23

broadcast10.2.159.255

first host10.2.158.1

last host10.2.159.254

subnet mask255.255.254.0

wildcard0.0.1.255

addresses512

usable hosts510

classA

ipcalc 10.2.158.0/23

address00001010.00000010.10011110.00000000

subnet mask11111111.11111111.11111110.00000000

network00001010.00000010.10011110.00000000

broadcast00001010.00000010.10011111.11111111

green = network part, grey = host part

hex0x0a029e00

decimal167943680

reverse dns0.158.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:9e00

/23 split into /31 · 256 subnets

close ×

#	network	host range	broadcast
1	10.2.158.0/31	10.2.158.0 – 10.2.158.1	10.2.158.1
2	10.2.158.2/31	10.2.158.2 – 10.2.158.3	10.2.158.3
3	10.2.158.4/31	10.2.158.4 – 10.2.158.5	10.2.158.5
4	10.2.158.6/31	10.2.158.6 – 10.2.158.7	10.2.158.7
5	10.2.158.8/31	10.2.158.8 – 10.2.158.9	10.2.158.9
6	10.2.158.10/31	10.2.158.10 – 10.2.158.11	10.2.158.11
7	10.2.158.12/31	10.2.158.12 – 10.2.158.13	10.2.158.13
8	10.2.158.14/31	10.2.158.14 – 10.2.158.15	10.2.158.15
9	10.2.158.16/31	10.2.158.16 – 10.2.158.17	10.2.158.17
10	10.2.158.18/31	10.2.158.18 – 10.2.158.19	10.2.158.19
11	10.2.158.20/31	10.2.158.20 – 10.2.158.21	10.2.158.21
12	10.2.158.22/31	10.2.158.22 – 10.2.158.23	10.2.158.23
13	10.2.158.24/31	10.2.158.24 – 10.2.158.25	10.2.158.25
14	10.2.158.26/31	10.2.158.26 – 10.2.158.27	10.2.158.27
15	10.2.158.28/31	10.2.158.28 – 10.2.158.29	10.2.158.29
16	10.2.158.30/31	10.2.158.30 – 10.2.158.31	10.2.158.31
17	10.2.158.32/31	10.2.158.32 – 10.2.158.33	10.2.158.33
18	10.2.158.34/31	10.2.158.34 – 10.2.158.35	10.2.158.35
19	10.2.158.36/31	10.2.158.36 – 10.2.158.37	10.2.158.37
20	10.2.158.38/31	10.2.158.38 – 10.2.158.39	10.2.158.39
21	10.2.158.40/31	10.2.158.40 – 10.2.158.41	10.2.158.41
22	10.2.158.42/31	10.2.158.42 – 10.2.158.43	10.2.158.43
23	10.2.158.44/31	10.2.158.44 – 10.2.158.45	10.2.158.45
24	10.2.158.46/31	10.2.158.46 – 10.2.158.47	10.2.158.47
25	10.2.158.48/31	10.2.158.48 – 10.2.158.49	10.2.158.49
26	10.2.158.50/31	10.2.158.50 – 10.2.158.51	10.2.158.51
27	10.2.158.52/31	10.2.158.52 – 10.2.158.53	10.2.158.53
28	10.2.158.54/31	10.2.158.54 – 10.2.158.55	10.2.158.55
29	10.2.158.56/31	10.2.158.56 – 10.2.158.57	10.2.158.57
30	10.2.158.58/31	10.2.158.58 – 10.2.158.59	10.2.158.59
31	10.2.158.60/31	10.2.158.60 – 10.2.158.61	10.2.158.61
32	10.2.158.62/31	10.2.158.62 – 10.2.158.63	10.2.158.63
33	10.2.158.64/31	10.2.158.64 – 10.2.158.65	10.2.158.65
34	10.2.158.66/31	10.2.158.66 – 10.2.158.67	10.2.158.67
35	10.2.158.68/31	10.2.158.68 – 10.2.158.69	10.2.158.69
36	10.2.158.70/31	10.2.158.70 – 10.2.158.71	10.2.158.71
37	10.2.158.72/31	10.2.158.72 – 10.2.158.73	10.2.158.73
38	10.2.158.74/31	10.2.158.74 – 10.2.158.75	10.2.158.75
39	10.2.158.76/31	10.2.158.76 – 10.2.158.77	10.2.158.77
40	10.2.158.78/31	10.2.158.78 – 10.2.158.79	10.2.158.79
41	10.2.158.80/31	10.2.158.80 – 10.2.158.81	10.2.158.81
42	10.2.158.82/31	10.2.158.82 – 10.2.158.83	10.2.158.83
43	10.2.158.84/31	10.2.158.84 – 10.2.158.85	10.2.158.85
44	10.2.158.86/31	10.2.158.86 – 10.2.158.87	10.2.158.87
45	10.2.158.88/31	10.2.158.88 – 10.2.158.89	10.2.158.89
46	10.2.158.90/31	10.2.158.90 – 10.2.158.91	10.2.158.91
47	10.2.158.92/31	10.2.158.92 – 10.2.158.93	10.2.158.93
48	10.2.158.94/31	10.2.158.94 – 10.2.158.95	10.2.158.95
49	10.2.158.96/31	10.2.158.96 – 10.2.158.97	10.2.158.97
50	10.2.158.98/31	10.2.158.98 – 10.2.158.99	10.2.158.99
51	10.2.158.100/31	10.2.158.100 – 10.2.158.101	10.2.158.101
52	10.2.158.102/31	10.2.158.102 – 10.2.158.103	10.2.158.103
53	10.2.158.104/31	10.2.158.104 – 10.2.158.105	10.2.158.105
54	10.2.158.106/31	10.2.158.106 – 10.2.158.107	10.2.158.107
55	10.2.158.108/31	10.2.158.108 – 10.2.158.109	10.2.158.109
56	10.2.158.110/31	10.2.158.110 – 10.2.158.111	10.2.158.111
57	10.2.158.112/31	10.2.158.112 – 10.2.158.113	10.2.158.113
58	10.2.158.114/31	10.2.158.114 – 10.2.158.115	10.2.158.115
59	10.2.158.116/31	10.2.158.116 – 10.2.158.117	10.2.158.117
60	10.2.158.118/31	10.2.158.118 – 10.2.158.119	10.2.158.119
61	10.2.158.120/31	10.2.158.120 – 10.2.158.121	10.2.158.121
62	10.2.158.122/31	10.2.158.122 – 10.2.158.123	10.2.158.123
63	10.2.158.124/31	10.2.158.124 – 10.2.158.125	10.2.158.125
64	10.2.158.126/31	10.2.158.126 – 10.2.158.127	10.2.158.127
65	10.2.158.128/31	10.2.158.128 – 10.2.158.129	10.2.158.129
66	10.2.158.130/31	10.2.158.130 – 10.2.158.131	10.2.158.131
67	10.2.158.132/31	10.2.158.132 – 10.2.158.133	10.2.158.133
68	10.2.158.134/31	10.2.158.134 – 10.2.158.135	10.2.158.135
69	10.2.158.136/31	10.2.158.136 – 10.2.158.137	10.2.158.137
70	10.2.158.138/31	10.2.158.138 – 10.2.158.139	10.2.158.139
71	10.2.158.140/31	10.2.158.140 – 10.2.158.141	10.2.158.141
72	10.2.158.142/31	10.2.158.142 – 10.2.158.143	10.2.158.143
73	10.2.158.144/31	10.2.158.144 – 10.2.158.145	10.2.158.145
74	10.2.158.146/31	10.2.158.146 – 10.2.158.147	10.2.158.147
75	10.2.158.148/31	10.2.158.148 – 10.2.158.149	10.2.158.149
76	10.2.158.150/31	10.2.158.150 – 10.2.158.151	10.2.158.151
77	10.2.158.152/31	10.2.158.152 – 10.2.158.153	10.2.158.153
78	10.2.158.154/31	10.2.158.154 – 10.2.158.155	10.2.158.155
79	10.2.158.156/31	10.2.158.156 – 10.2.158.157	10.2.158.157
80	10.2.158.158/31	10.2.158.158 – 10.2.158.159	10.2.158.159
81	10.2.158.160/31	10.2.158.160 – 10.2.158.161	10.2.158.161
82	10.2.158.162/31	10.2.158.162 – 10.2.158.163	10.2.158.163
83	10.2.158.164/31	10.2.158.164 – 10.2.158.165	10.2.158.165
84	10.2.158.166/31	10.2.158.166 – 10.2.158.167	10.2.158.167
85	10.2.158.168/31	10.2.158.168 – 10.2.158.169	10.2.158.169
86	10.2.158.170/31	10.2.158.170 – 10.2.158.171	10.2.158.171
87	10.2.158.172/31	10.2.158.172 – 10.2.158.173	10.2.158.173
88	10.2.158.174/31	10.2.158.174 – 10.2.158.175	10.2.158.175
89	10.2.158.176/31	10.2.158.176 – 10.2.158.177	10.2.158.177
90	10.2.158.178/31	10.2.158.178 – 10.2.158.179	10.2.158.179
91	10.2.158.180/31	10.2.158.180 – 10.2.158.181	10.2.158.181
92	10.2.158.182/31	10.2.158.182 – 10.2.158.183	10.2.158.183
93	10.2.158.184/31	10.2.158.184 – 10.2.158.185	10.2.158.185
94	10.2.158.186/31	10.2.158.186 – 10.2.158.187	10.2.158.187
95	10.2.158.188/31	10.2.158.188 – 10.2.158.189	10.2.158.189
96	10.2.158.190/31	10.2.158.190 – 10.2.158.191	10.2.158.191
97	10.2.158.192/31	10.2.158.192 – 10.2.158.193	10.2.158.193
98	10.2.158.194/31	10.2.158.194 – 10.2.158.195	10.2.158.195
99	10.2.158.196/31	10.2.158.196 – 10.2.158.197	10.2.158.197
100	10.2.158.198/31	10.2.158.198 – 10.2.158.199	10.2.158.199
101	10.2.158.200/31	10.2.158.200 – 10.2.158.201	10.2.158.201
102	10.2.158.202/31	10.2.158.202 – 10.2.158.203	10.2.158.203
103	10.2.158.204/31	10.2.158.204 – 10.2.158.205	10.2.158.205
104	10.2.158.206/31	10.2.158.206 – 10.2.158.207	10.2.158.207
105	10.2.158.208/31	10.2.158.208 – 10.2.158.209	10.2.158.209
106	10.2.158.210/31	10.2.158.210 – 10.2.158.211	10.2.158.211
107	10.2.158.212/31	10.2.158.212 – 10.2.158.213	10.2.158.213
108	10.2.158.214/31	10.2.158.214 – 10.2.158.215	10.2.158.215
109	10.2.158.216/31	10.2.158.216 – 10.2.158.217	10.2.158.217
110	10.2.158.218/31	10.2.158.218 – 10.2.158.219	10.2.158.219
111	10.2.158.220/31	10.2.158.220 – 10.2.158.221	10.2.158.221
112	10.2.158.222/31	10.2.158.222 – 10.2.158.223	10.2.158.223
113	10.2.158.224/31	10.2.158.224 – 10.2.158.225	10.2.158.225
114	10.2.158.226/31	10.2.158.226 – 10.2.158.227	10.2.158.227
115	10.2.158.228/31	10.2.158.228 – 10.2.158.229	10.2.158.229
116	10.2.158.230/31	10.2.158.230 – 10.2.158.231	10.2.158.231
117	10.2.158.232/31	10.2.158.232 – 10.2.158.233	10.2.158.233
118	10.2.158.234/31	10.2.158.234 – 10.2.158.235	10.2.158.235
119	10.2.158.236/31	10.2.158.236 – 10.2.158.237	10.2.158.237
120	10.2.158.238/31	10.2.158.238 – 10.2.158.239	10.2.158.239
121	10.2.158.240/31	10.2.158.240 – 10.2.158.241	10.2.158.241
122	10.2.158.242/31	10.2.158.242 – 10.2.158.243	10.2.158.243
123	10.2.158.244/31	10.2.158.244 – 10.2.158.245	10.2.158.245
124	10.2.158.246/31	10.2.158.246 – 10.2.158.247	10.2.158.247
125	10.2.158.248/31	10.2.158.248 – 10.2.158.249	10.2.158.249
126	10.2.158.250/31	10.2.158.250 – 10.2.158.251	10.2.158.251
127	10.2.158.252/31	10.2.158.252 – 10.2.158.253	10.2.158.253
128	10.2.158.254/31	10.2.158.254 – 10.2.158.255	10.2.158.255
129	10.2.159.0/31	10.2.159.0 – 10.2.159.1	10.2.159.1
130	10.2.159.2/31	10.2.159.2 – 10.2.159.3	10.2.159.3
131	10.2.159.4/31	10.2.159.4 – 10.2.159.5	10.2.159.5
132	10.2.159.6/31	10.2.159.6 – 10.2.159.7	10.2.159.7
133	10.2.159.8/31	10.2.159.8 – 10.2.159.9	10.2.159.9
134	10.2.159.10/31	10.2.159.10 – 10.2.159.11	10.2.159.11
135	10.2.159.12/31	10.2.159.12 – 10.2.159.13	10.2.159.13
136	10.2.159.14/31	10.2.159.14 – 10.2.159.15	10.2.159.15
137	10.2.159.16/31	10.2.159.16 – 10.2.159.17	10.2.159.17
138	10.2.159.18/31	10.2.159.18 – 10.2.159.19	10.2.159.19
139	10.2.159.20/31	10.2.159.20 – 10.2.159.21	10.2.159.21
140	10.2.159.22/31	10.2.159.22 – 10.2.159.23	10.2.159.23
141	10.2.159.24/31	10.2.159.24 – 10.2.159.25	10.2.159.25
142	10.2.159.26/31	10.2.159.26 – 10.2.159.27	10.2.159.27
143	10.2.159.28/31	10.2.159.28 – 10.2.159.29	10.2.159.29
144	10.2.159.30/31	10.2.159.30 – 10.2.159.31	10.2.159.31
145	10.2.159.32/31	10.2.159.32 – 10.2.159.33	10.2.159.33
146	10.2.159.34/31	10.2.159.34 – 10.2.159.35	10.2.159.35
147	10.2.159.36/31	10.2.159.36 – 10.2.159.37	10.2.159.37
148	10.2.159.38/31	10.2.159.38 – 10.2.159.39	10.2.159.39
149	10.2.159.40/31	10.2.159.40 – 10.2.159.41	10.2.159.41
150	10.2.159.42/31	10.2.159.42 – 10.2.159.43	10.2.159.43
151	10.2.159.44/31	10.2.159.44 – 10.2.159.45	10.2.159.45
152	10.2.159.46/31	10.2.159.46 – 10.2.159.47	10.2.159.47
153	10.2.159.48/31	10.2.159.48 – 10.2.159.49	10.2.159.49
154	10.2.159.50/31	10.2.159.50 – 10.2.159.51	10.2.159.51
155	10.2.159.52/31	10.2.159.52 – 10.2.159.53	10.2.159.53
156	10.2.159.54/31	10.2.159.54 – 10.2.159.55	10.2.159.55
157	10.2.159.56/31	10.2.159.56 – 10.2.159.57	10.2.159.57
158	10.2.159.58/31	10.2.159.58 – 10.2.159.59	10.2.159.59
159	10.2.159.60/31	10.2.159.60 – 10.2.159.61	10.2.159.61
160	10.2.159.62/31	10.2.159.62 – 10.2.159.63	10.2.159.63
161	10.2.159.64/31	10.2.159.64 – 10.2.159.65	10.2.159.65
162	10.2.159.66/31	10.2.159.66 – 10.2.159.67	10.2.159.67
163	10.2.159.68/31	10.2.159.68 – 10.2.159.69	10.2.159.69
164	10.2.159.70/31	10.2.159.70 – 10.2.159.71	10.2.159.71
165	10.2.159.72/31	10.2.159.72 – 10.2.159.73	10.2.159.73
166	10.2.159.74/31	10.2.159.74 – 10.2.159.75	10.2.159.75
167	10.2.159.76/31	10.2.159.76 – 10.2.159.77	10.2.159.77
168	10.2.159.78/31	10.2.159.78 – 10.2.159.79	10.2.159.79
169	10.2.159.80/31	10.2.159.80 – 10.2.159.81	10.2.159.81
170	10.2.159.82/31	10.2.159.82 – 10.2.159.83	10.2.159.83
171	10.2.159.84/31	10.2.159.84 – 10.2.159.85	10.2.159.85
172	10.2.159.86/31	10.2.159.86 – 10.2.159.87	10.2.159.87
173	10.2.159.88/31	10.2.159.88 – 10.2.159.89	10.2.159.89
174	10.2.159.90/31	10.2.159.90 – 10.2.159.91	10.2.159.91
175	10.2.159.92/31	10.2.159.92 – 10.2.159.93	10.2.159.93
176	10.2.159.94/31	10.2.159.94 – 10.2.159.95	10.2.159.95
177	10.2.159.96/31	10.2.159.96 – 10.2.159.97	10.2.159.97
178	10.2.159.98/31	10.2.159.98 – 10.2.159.99	10.2.159.99
179	10.2.159.100/31	10.2.159.100 – 10.2.159.101	10.2.159.101
180	10.2.159.102/31	10.2.159.102 – 10.2.159.103	10.2.159.103
181	10.2.159.104/31	10.2.159.104 – 10.2.159.105	10.2.159.105
182	10.2.159.106/31	10.2.159.106 – 10.2.159.107	10.2.159.107
183	10.2.159.108/31	10.2.159.108 – 10.2.159.109	10.2.159.109
184	10.2.159.110/31	10.2.159.110 – 10.2.159.111	10.2.159.111
185	10.2.159.112/31	10.2.159.112 – 10.2.159.113	10.2.159.113
186	10.2.159.114/31	10.2.159.114 – 10.2.159.115	10.2.159.115
187	10.2.159.116/31	10.2.159.116 – 10.2.159.117	10.2.159.117
188	10.2.159.118/31	10.2.159.118 – 10.2.159.119	10.2.159.119
189	10.2.159.120/31	10.2.159.120 – 10.2.159.121	10.2.159.121
190	10.2.159.122/31	10.2.159.122 – 10.2.159.123	10.2.159.123
191	10.2.159.124/31	10.2.159.124 – 10.2.159.125	10.2.159.125
192	10.2.159.126/31	10.2.159.126 – 10.2.159.127	10.2.159.127
193	10.2.159.128/31	10.2.159.128 – 10.2.159.129	10.2.159.129
194	10.2.159.130/31	10.2.159.130 – 10.2.159.131	10.2.159.131
195	10.2.159.132/31	10.2.159.132 – 10.2.159.133	10.2.159.133
196	10.2.159.134/31	10.2.159.134 – 10.2.159.135	10.2.159.135
197	10.2.159.136/31	10.2.159.136 – 10.2.159.137	10.2.159.137
198	10.2.159.138/31	10.2.159.138 – 10.2.159.139	10.2.159.139
199	10.2.159.140/31	10.2.159.140 – 10.2.159.141	10.2.159.141
200	10.2.159.142/31	10.2.159.142 – 10.2.159.143	10.2.159.143
201	10.2.159.144/31	10.2.159.144 – 10.2.159.145	10.2.159.145
202	10.2.159.146/31	10.2.159.146 – 10.2.159.147	10.2.159.147
203	10.2.159.148/31	10.2.159.148 – 10.2.159.149	10.2.159.149
204	10.2.159.150/31	10.2.159.150 – 10.2.159.151	10.2.159.151
205	10.2.159.152/31	10.2.159.152 – 10.2.159.153	10.2.159.153
206	10.2.159.154/31	10.2.159.154 – 10.2.159.155	10.2.159.155
207	10.2.159.156/31	10.2.159.156 – 10.2.159.157	10.2.159.157
208	10.2.159.158/31	10.2.159.158 – 10.2.159.159	10.2.159.159
209	10.2.159.160/31	10.2.159.160 – 10.2.159.161	10.2.159.161
210	10.2.159.162/31	10.2.159.162 – 10.2.159.163	10.2.159.163
211	10.2.159.164/31	10.2.159.164 – 10.2.159.165	10.2.159.165
212	10.2.159.166/31	10.2.159.166 – 10.2.159.167	10.2.159.167
213	10.2.159.168/31	10.2.159.168 – 10.2.159.169	10.2.159.169
214	10.2.159.170/31	10.2.159.170 – 10.2.159.171	10.2.159.171
215	10.2.159.172/31	10.2.159.172 – 10.2.159.173	10.2.159.173
216	10.2.159.174/31	10.2.159.174 – 10.2.159.175	10.2.159.175
217	10.2.159.176/31	10.2.159.176 – 10.2.159.177	10.2.159.177
218	10.2.159.178/31	10.2.159.178 – 10.2.159.179	10.2.159.179
219	10.2.159.180/31	10.2.159.180 – 10.2.159.181	10.2.159.181
220	10.2.159.182/31	10.2.159.182 – 10.2.159.183	10.2.159.183
221	10.2.159.184/31	10.2.159.184 – 10.2.159.185	10.2.159.185
222	10.2.159.186/31	10.2.159.186 – 10.2.159.187	10.2.159.187
223	10.2.159.188/31	10.2.159.188 – 10.2.159.189	10.2.159.189
224	10.2.159.190/31	10.2.159.190 – 10.2.159.191	10.2.159.191
225	10.2.159.192/31	10.2.159.192 – 10.2.159.193	10.2.159.193
226	10.2.159.194/31	10.2.159.194 – 10.2.159.195	10.2.159.195
227	10.2.159.196/31	10.2.159.196 – 10.2.159.197	10.2.159.197
228	10.2.159.198/31	10.2.159.198 – 10.2.159.199	10.2.159.199
229	10.2.159.200/31	10.2.159.200 – 10.2.159.201	10.2.159.201
230	10.2.159.202/31	10.2.159.202 – 10.2.159.203	10.2.159.203
231	10.2.159.204/31	10.2.159.204 – 10.2.159.205	10.2.159.205
232	10.2.159.206/31	10.2.159.206 – 10.2.159.207	10.2.159.207
233	10.2.159.208/31	10.2.159.208 – 10.2.159.209	10.2.159.209
234	10.2.159.210/31	10.2.159.210 – 10.2.159.211	10.2.159.211
235	10.2.159.212/31	10.2.159.212 – 10.2.159.213	10.2.159.213
236	10.2.159.214/31	10.2.159.214 – 10.2.159.215	10.2.159.215
237	10.2.159.216/31	10.2.159.216 – 10.2.159.217	10.2.159.217
238	10.2.159.218/31	10.2.159.218 – 10.2.159.219	10.2.159.219
239	10.2.159.220/31	10.2.159.220 – 10.2.159.221	10.2.159.221
240	10.2.159.222/31	10.2.159.222 – 10.2.159.223	10.2.159.223
241	10.2.159.224/31	10.2.159.224 – 10.2.159.225	10.2.159.225
242	10.2.159.226/31	10.2.159.226 – 10.2.159.227	10.2.159.227
243	10.2.159.228/31	10.2.159.228 – 10.2.159.229	10.2.159.229
244	10.2.159.230/31	10.2.159.230 – 10.2.159.231	10.2.159.231
245	10.2.159.232/31	10.2.159.232 – 10.2.159.233	10.2.159.233
246	10.2.159.234/31	10.2.159.234 – 10.2.159.235	10.2.159.235
247	10.2.159.236/31	10.2.159.236 – 10.2.159.237	10.2.159.237
248	10.2.159.238/31	10.2.159.238 – 10.2.159.239	10.2.159.239
249	10.2.159.240/31	10.2.159.240 – 10.2.159.241	10.2.159.241
250	10.2.159.242/31	10.2.159.242 – 10.2.159.243	10.2.159.243
251	10.2.159.244/31	10.2.159.244 – 10.2.159.245	10.2.159.245
252	10.2.159.246/31	10.2.159.246 – 10.2.159.247	10.2.159.247
253	10.2.159.248/31	10.2.159.248 – 10.2.159.249	10.2.159.249
254	10.2.159.250/31	10.2.159.250 – 10.2.159.251	10.2.159.251
255	10.2.159.252/31	10.2.159.252 – 10.2.159.253	10.2.159.253
256	10.2.159.254/31	10.2.159.254 – 10.2.159.255	10.2.159.255

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 →