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)10.2.70.0/23

network10.2.70.0/23

broadcast10.2.71.255

first host10.2.70.1

last host10.2.71.254

subnet mask255.255.254.0

wildcard0.0.1.255

addresses512

usable hosts510

classA

ipcalc 10.2.70.0/23

address00001010.00000010.01000110.00000000

subnet mask11111111.11111111.11111110.00000000

network00001010.00000010.01000110.00000000

broadcast00001010.00000010.01000111.11111111

green = network part, grey = host part

hex0x0a024600

decimal167921152

reverse dns0.70.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:4600

/23 split into /31 · 256 subnets

close ×

#	network	host range	broadcast
1	10.2.70.0/31	10.2.70.0 – 10.2.70.1	10.2.70.1
2	10.2.70.2/31	10.2.70.2 – 10.2.70.3	10.2.70.3
3	10.2.70.4/31	10.2.70.4 – 10.2.70.5	10.2.70.5
4	10.2.70.6/31	10.2.70.6 – 10.2.70.7	10.2.70.7
5	10.2.70.8/31	10.2.70.8 – 10.2.70.9	10.2.70.9
6	10.2.70.10/31	10.2.70.10 – 10.2.70.11	10.2.70.11
7	10.2.70.12/31	10.2.70.12 – 10.2.70.13	10.2.70.13
8	10.2.70.14/31	10.2.70.14 – 10.2.70.15	10.2.70.15
9	10.2.70.16/31	10.2.70.16 – 10.2.70.17	10.2.70.17
10	10.2.70.18/31	10.2.70.18 – 10.2.70.19	10.2.70.19
11	10.2.70.20/31	10.2.70.20 – 10.2.70.21	10.2.70.21
12	10.2.70.22/31	10.2.70.22 – 10.2.70.23	10.2.70.23
13	10.2.70.24/31	10.2.70.24 – 10.2.70.25	10.2.70.25
14	10.2.70.26/31	10.2.70.26 – 10.2.70.27	10.2.70.27
15	10.2.70.28/31	10.2.70.28 – 10.2.70.29	10.2.70.29
16	10.2.70.30/31	10.2.70.30 – 10.2.70.31	10.2.70.31
17	10.2.70.32/31	10.2.70.32 – 10.2.70.33	10.2.70.33
18	10.2.70.34/31	10.2.70.34 – 10.2.70.35	10.2.70.35
19	10.2.70.36/31	10.2.70.36 – 10.2.70.37	10.2.70.37
20	10.2.70.38/31	10.2.70.38 – 10.2.70.39	10.2.70.39
21	10.2.70.40/31	10.2.70.40 – 10.2.70.41	10.2.70.41
22	10.2.70.42/31	10.2.70.42 – 10.2.70.43	10.2.70.43
23	10.2.70.44/31	10.2.70.44 – 10.2.70.45	10.2.70.45
24	10.2.70.46/31	10.2.70.46 – 10.2.70.47	10.2.70.47
25	10.2.70.48/31	10.2.70.48 – 10.2.70.49	10.2.70.49
26	10.2.70.50/31	10.2.70.50 – 10.2.70.51	10.2.70.51
27	10.2.70.52/31	10.2.70.52 – 10.2.70.53	10.2.70.53
28	10.2.70.54/31	10.2.70.54 – 10.2.70.55	10.2.70.55
29	10.2.70.56/31	10.2.70.56 – 10.2.70.57	10.2.70.57
30	10.2.70.58/31	10.2.70.58 – 10.2.70.59	10.2.70.59
31	10.2.70.60/31	10.2.70.60 – 10.2.70.61	10.2.70.61
32	10.2.70.62/31	10.2.70.62 – 10.2.70.63	10.2.70.63
33	10.2.70.64/31	10.2.70.64 – 10.2.70.65	10.2.70.65
34	10.2.70.66/31	10.2.70.66 – 10.2.70.67	10.2.70.67
35	10.2.70.68/31	10.2.70.68 – 10.2.70.69	10.2.70.69
36	10.2.70.70/31	10.2.70.70 – 10.2.70.71	10.2.70.71
37	10.2.70.72/31	10.2.70.72 – 10.2.70.73	10.2.70.73
38	10.2.70.74/31	10.2.70.74 – 10.2.70.75	10.2.70.75
39	10.2.70.76/31	10.2.70.76 – 10.2.70.77	10.2.70.77
40	10.2.70.78/31	10.2.70.78 – 10.2.70.79	10.2.70.79
41	10.2.70.80/31	10.2.70.80 – 10.2.70.81	10.2.70.81
42	10.2.70.82/31	10.2.70.82 – 10.2.70.83	10.2.70.83
43	10.2.70.84/31	10.2.70.84 – 10.2.70.85	10.2.70.85
44	10.2.70.86/31	10.2.70.86 – 10.2.70.87	10.2.70.87
45	10.2.70.88/31	10.2.70.88 – 10.2.70.89	10.2.70.89
46	10.2.70.90/31	10.2.70.90 – 10.2.70.91	10.2.70.91
47	10.2.70.92/31	10.2.70.92 – 10.2.70.93	10.2.70.93
48	10.2.70.94/31	10.2.70.94 – 10.2.70.95	10.2.70.95
49	10.2.70.96/31	10.2.70.96 – 10.2.70.97	10.2.70.97
50	10.2.70.98/31	10.2.70.98 – 10.2.70.99	10.2.70.99
51	10.2.70.100/31	10.2.70.100 – 10.2.70.101	10.2.70.101
52	10.2.70.102/31	10.2.70.102 – 10.2.70.103	10.2.70.103
53	10.2.70.104/31	10.2.70.104 – 10.2.70.105	10.2.70.105
54	10.2.70.106/31	10.2.70.106 – 10.2.70.107	10.2.70.107
55	10.2.70.108/31	10.2.70.108 – 10.2.70.109	10.2.70.109
56	10.2.70.110/31	10.2.70.110 – 10.2.70.111	10.2.70.111
57	10.2.70.112/31	10.2.70.112 – 10.2.70.113	10.2.70.113
58	10.2.70.114/31	10.2.70.114 – 10.2.70.115	10.2.70.115
59	10.2.70.116/31	10.2.70.116 – 10.2.70.117	10.2.70.117
60	10.2.70.118/31	10.2.70.118 – 10.2.70.119	10.2.70.119
61	10.2.70.120/31	10.2.70.120 – 10.2.70.121	10.2.70.121
62	10.2.70.122/31	10.2.70.122 – 10.2.70.123	10.2.70.123
63	10.2.70.124/31	10.2.70.124 – 10.2.70.125	10.2.70.125
64	10.2.70.126/31	10.2.70.126 – 10.2.70.127	10.2.70.127
65	10.2.70.128/31	10.2.70.128 – 10.2.70.129	10.2.70.129
66	10.2.70.130/31	10.2.70.130 – 10.2.70.131	10.2.70.131
67	10.2.70.132/31	10.2.70.132 – 10.2.70.133	10.2.70.133
68	10.2.70.134/31	10.2.70.134 – 10.2.70.135	10.2.70.135
69	10.2.70.136/31	10.2.70.136 – 10.2.70.137	10.2.70.137
70	10.2.70.138/31	10.2.70.138 – 10.2.70.139	10.2.70.139
71	10.2.70.140/31	10.2.70.140 – 10.2.70.141	10.2.70.141
72	10.2.70.142/31	10.2.70.142 – 10.2.70.143	10.2.70.143
73	10.2.70.144/31	10.2.70.144 – 10.2.70.145	10.2.70.145
74	10.2.70.146/31	10.2.70.146 – 10.2.70.147	10.2.70.147
75	10.2.70.148/31	10.2.70.148 – 10.2.70.149	10.2.70.149
76	10.2.70.150/31	10.2.70.150 – 10.2.70.151	10.2.70.151
77	10.2.70.152/31	10.2.70.152 – 10.2.70.153	10.2.70.153
78	10.2.70.154/31	10.2.70.154 – 10.2.70.155	10.2.70.155
79	10.2.70.156/31	10.2.70.156 – 10.2.70.157	10.2.70.157
80	10.2.70.158/31	10.2.70.158 – 10.2.70.159	10.2.70.159
81	10.2.70.160/31	10.2.70.160 – 10.2.70.161	10.2.70.161
82	10.2.70.162/31	10.2.70.162 – 10.2.70.163	10.2.70.163
83	10.2.70.164/31	10.2.70.164 – 10.2.70.165	10.2.70.165
84	10.2.70.166/31	10.2.70.166 – 10.2.70.167	10.2.70.167
85	10.2.70.168/31	10.2.70.168 – 10.2.70.169	10.2.70.169
86	10.2.70.170/31	10.2.70.170 – 10.2.70.171	10.2.70.171
87	10.2.70.172/31	10.2.70.172 – 10.2.70.173	10.2.70.173
88	10.2.70.174/31	10.2.70.174 – 10.2.70.175	10.2.70.175
89	10.2.70.176/31	10.2.70.176 – 10.2.70.177	10.2.70.177
90	10.2.70.178/31	10.2.70.178 – 10.2.70.179	10.2.70.179
91	10.2.70.180/31	10.2.70.180 – 10.2.70.181	10.2.70.181
92	10.2.70.182/31	10.2.70.182 – 10.2.70.183	10.2.70.183
93	10.2.70.184/31	10.2.70.184 – 10.2.70.185	10.2.70.185
94	10.2.70.186/31	10.2.70.186 – 10.2.70.187	10.2.70.187
95	10.2.70.188/31	10.2.70.188 – 10.2.70.189	10.2.70.189
96	10.2.70.190/31	10.2.70.190 – 10.2.70.191	10.2.70.191
97	10.2.70.192/31	10.2.70.192 – 10.2.70.193	10.2.70.193
98	10.2.70.194/31	10.2.70.194 – 10.2.70.195	10.2.70.195
99	10.2.70.196/31	10.2.70.196 – 10.2.70.197	10.2.70.197
100	10.2.70.198/31	10.2.70.198 – 10.2.70.199	10.2.70.199
101	10.2.70.200/31	10.2.70.200 – 10.2.70.201	10.2.70.201
102	10.2.70.202/31	10.2.70.202 – 10.2.70.203	10.2.70.203
103	10.2.70.204/31	10.2.70.204 – 10.2.70.205	10.2.70.205
104	10.2.70.206/31	10.2.70.206 – 10.2.70.207	10.2.70.207
105	10.2.70.208/31	10.2.70.208 – 10.2.70.209	10.2.70.209
106	10.2.70.210/31	10.2.70.210 – 10.2.70.211	10.2.70.211
107	10.2.70.212/31	10.2.70.212 – 10.2.70.213	10.2.70.213
108	10.2.70.214/31	10.2.70.214 – 10.2.70.215	10.2.70.215
109	10.2.70.216/31	10.2.70.216 – 10.2.70.217	10.2.70.217
110	10.2.70.218/31	10.2.70.218 – 10.2.70.219	10.2.70.219
111	10.2.70.220/31	10.2.70.220 – 10.2.70.221	10.2.70.221
112	10.2.70.222/31	10.2.70.222 – 10.2.70.223	10.2.70.223
113	10.2.70.224/31	10.2.70.224 – 10.2.70.225	10.2.70.225
114	10.2.70.226/31	10.2.70.226 – 10.2.70.227	10.2.70.227
115	10.2.70.228/31	10.2.70.228 – 10.2.70.229	10.2.70.229
116	10.2.70.230/31	10.2.70.230 – 10.2.70.231	10.2.70.231
117	10.2.70.232/31	10.2.70.232 – 10.2.70.233	10.2.70.233
118	10.2.70.234/31	10.2.70.234 – 10.2.70.235	10.2.70.235
119	10.2.70.236/31	10.2.70.236 – 10.2.70.237	10.2.70.237
120	10.2.70.238/31	10.2.70.238 – 10.2.70.239	10.2.70.239
121	10.2.70.240/31	10.2.70.240 – 10.2.70.241	10.2.70.241
122	10.2.70.242/31	10.2.70.242 – 10.2.70.243	10.2.70.243
123	10.2.70.244/31	10.2.70.244 – 10.2.70.245	10.2.70.245
124	10.2.70.246/31	10.2.70.246 – 10.2.70.247	10.2.70.247
125	10.2.70.248/31	10.2.70.248 – 10.2.70.249	10.2.70.249
126	10.2.70.250/31	10.2.70.250 – 10.2.70.251	10.2.70.251
127	10.2.70.252/31	10.2.70.252 – 10.2.70.253	10.2.70.253
128	10.2.70.254/31	10.2.70.254 – 10.2.70.255	10.2.70.255
129	10.2.71.0/31	10.2.71.0 – 10.2.71.1	10.2.71.1
130	10.2.71.2/31	10.2.71.2 – 10.2.71.3	10.2.71.3
131	10.2.71.4/31	10.2.71.4 – 10.2.71.5	10.2.71.5
132	10.2.71.6/31	10.2.71.6 – 10.2.71.7	10.2.71.7
133	10.2.71.8/31	10.2.71.8 – 10.2.71.9	10.2.71.9
134	10.2.71.10/31	10.2.71.10 – 10.2.71.11	10.2.71.11
135	10.2.71.12/31	10.2.71.12 – 10.2.71.13	10.2.71.13
136	10.2.71.14/31	10.2.71.14 – 10.2.71.15	10.2.71.15
137	10.2.71.16/31	10.2.71.16 – 10.2.71.17	10.2.71.17
138	10.2.71.18/31	10.2.71.18 – 10.2.71.19	10.2.71.19
139	10.2.71.20/31	10.2.71.20 – 10.2.71.21	10.2.71.21
140	10.2.71.22/31	10.2.71.22 – 10.2.71.23	10.2.71.23
141	10.2.71.24/31	10.2.71.24 – 10.2.71.25	10.2.71.25
142	10.2.71.26/31	10.2.71.26 – 10.2.71.27	10.2.71.27
143	10.2.71.28/31	10.2.71.28 – 10.2.71.29	10.2.71.29
144	10.2.71.30/31	10.2.71.30 – 10.2.71.31	10.2.71.31
145	10.2.71.32/31	10.2.71.32 – 10.2.71.33	10.2.71.33
146	10.2.71.34/31	10.2.71.34 – 10.2.71.35	10.2.71.35
147	10.2.71.36/31	10.2.71.36 – 10.2.71.37	10.2.71.37
148	10.2.71.38/31	10.2.71.38 – 10.2.71.39	10.2.71.39
149	10.2.71.40/31	10.2.71.40 – 10.2.71.41	10.2.71.41
150	10.2.71.42/31	10.2.71.42 – 10.2.71.43	10.2.71.43
151	10.2.71.44/31	10.2.71.44 – 10.2.71.45	10.2.71.45
152	10.2.71.46/31	10.2.71.46 – 10.2.71.47	10.2.71.47
153	10.2.71.48/31	10.2.71.48 – 10.2.71.49	10.2.71.49
154	10.2.71.50/31	10.2.71.50 – 10.2.71.51	10.2.71.51
155	10.2.71.52/31	10.2.71.52 – 10.2.71.53	10.2.71.53
156	10.2.71.54/31	10.2.71.54 – 10.2.71.55	10.2.71.55
157	10.2.71.56/31	10.2.71.56 – 10.2.71.57	10.2.71.57
158	10.2.71.58/31	10.2.71.58 – 10.2.71.59	10.2.71.59
159	10.2.71.60/31	10.2.71.60 – 10.2.71.61	10.2.71.61
160	10.2.71.62/31	10.2.71.62 – 10.2.71.63	10.2.71.63
161	10.2.71.64/31	10.2.71.64 – 10.2.71.65	10.2.71.65
162	10.2.71.66/31	10.2.71.66 – 10.2.71.67	10.2.71.67
163	10.2.71.68/31	10.2.71.68 – 10.2.71.69	10.2.71.69
164	10.2.71.70/31	10.2.71.70 – 10.2.71.71	10.2.71.71
165	10.2.71.72/31	10.2.71.72 – 10.2.71.73	10.2.71.73
166	10.2.71.74/31	10.2.71.74 – 10.2.71.75	10.2.71.75
167	10.2.71.76/31	10.2.71.76 – 10.2.71.77	10.2.71.77
168	10.2.71.78/31	10.2.71.78 – 10.2.71.79	10.2.71.79
169	10.2.71.80/31	10.2.71.80 – 10.2.71.81	10.2.71.81
170	10.2.71.82/31	10.2.71.82 – 10.2.71.83	10.2.71.83
171	10.2.71.84/31	10.2.71.84 – 10.2.71.85	10.2.71.85
172	10.2.71.86/31	10.2.71.86 – 10.2.71.87	10.2.71.87
173	10.2.71.88/31	10.2.71.88 – 10.2.71.89	10.2.71.89
174	10.2.71.90/31	10.2.71.90 – 10.2.71.91	10.2.71.91
175	10.2.71.92/31	10.2.71.92 – 10.2.71.93	10.2.71.93
176	10.2.71.94/31	10.2.71.94 – 10.2.71.95	10.2.71.95
177	10.2.71.96/31	10.2.71.96 – 10.2.71.97	10.2.71.97
178	10.2.71.98/31	10.2.71.98 – 10.2.71.99	10.2.71.99
179	10.2.71.100/31	10.2.71.100 – 10.2.71.101	10.2.71.101
180	10.2.71.102/31	10.2.71.102 – 10.2.71.103	10.2.71.103
181	10.2.71.104/31	10.2.71.104 – 10.2.71.105	10.2.71.105
182	10.2.71.106/31	10.2.71.106 – 10.2.71.107	10.2.71.107
183	10.2.71.108/31	10.2.71.108 – 10.2.71.109	10.2.71.109
184	10.2.71.110/31	10.2.71.110 – 10.2.71.111	10.2.71.111
185	10.2.71.112/31	10.2.71.112 – 10.2.71.113	10.2.71.113
186	10.2.71.114/31	10.2.71.114 – 10.2.71.115	10.2.71.115
187	10.2.71.116/31	10.2.71.116 – 10.2.71.117	10.2.71.117
188	10.2.71.118/31	10.2.71.118 – 10.2.71.119	10.2.71.119
189	10.2.71.120/31	10.2.71.120 – 10.2.71.121	10.2.71.121
190	10.2.71.122/31	10.2.71.122 – 10.2.71.123	10.2.71.123
191	10.2.71.124/31	10.2.71.124 – 10.2.71.125	10.2.71.125
192	10.2.71.126/31	10.2.71.126 – 10.2.71.127	10.2.71.127
193	10.2.71.128/31	10.2.71.128 – 10.2.71.129	10.2.71.129
194	10.2.71.130/31	10.2.71.130 – 10.2.71.131	10.2.71.131
195	10.2.71.132/31	10.2.71.132 – 10.2.71.133	10.2.71.133
196	10.2.71.134/31	10.2.71.134 – 10.2.71.135	10.2.71.135
197	10.2.71.136/31	10.2.71.136 – 10.2.71.137	10.2.71.137
198	10.2.71.138/31	10.2.71.138 – 10.2.71.139	10.2.71.139
199	10.2.71.140/31	10.2.71.140 – 10.2.71.141	10.2.71.141
200	10.2.71.142/31	10.2.71.142 – 10.2.71.143	10.2.71.143
201	10.2.71.144/31	10.2.71.144 – 10.2.71.145	10.2.71.145
202	10.2.71.146/31	10.2.71.146 – 10.2.71.147	10.2.71.147
203	10.2.71.148/31	10.2.71.148 – 10.2.71.149	10.2.71.149
204	10.2.71.150/31	10.2.71.150 – 10.2.71.151	10.2.71.151
205	10.2.71.152/31	10.2.71.152 – 10.2.71.153	10.2.71.153
206	10.2.71.154/31	10.2.71.154 – 10.2.71.155	10.2.71.155
207	10.2.71.156/31	10.2.71.156 – 10.2.71.157	10.2.71.157
208	10.2.71.158/31	10.2.71.158 – 10.2.71.159	10.2.71.159
209	10.2.71.160/31	10.2.71.160 – 10.2.71.161	10.2.71.161
210	10.2.71.162/31	10.2.71.162 – 10.2.71.163	10.2.71.163
211	10.2.71.164/31	10.2.71.164 – 10.2.71.165	10.2.71.165
212	10.2.71.166/31	10.2.71.166 – 10.2.71.167	10.2.71.167
213	10.2.71.168/31	10.2.71.168 – 10.2.71.169	10.2.71.169
214	10.2.71.170/31	10.2.71.170 – 10.2.71.171	10.2.71.171
215	10.2.71.172/31	10.2.71.172 – 10.2.71.173	10.2.71.173
216	10.2.71.174/31	10.2.71.174 – 10.2.71.175	10.2.71.175
217	10.2.71.176/31	10.2.71.176 – 10.2.71.177	10.2.71.177
218	10.2.71.178/31	10.2.71.178 – 10.2.71.179	10.2.71.179
219	10.2.71.180/31	10.2.71.180 – 10.2.71.181	10.2.71.181
220	10.2.71.182/31	10.2.71.182 – 10.2.71.183	10.2.71.183
221	10.2.71.184/31	10.2.71.184 – 10.2.71.185	10.2.71.185
222	10.2.71.186/31	10.2.71.186 – 10.2.71.187	10.2.71.187
223	10.2.71.188/31	10.2.71.188 – 10.2.71.189	10.2.71.189
224	10.2.71.190/31	10.2.71.190 – 10.2.71.191	10.2.71.191
225	10.2.71.192/31	10.2.71.192 – 10.2.71.193	10.2.71.193
226	10.2.71.194/31	10.2.71.194 – 10.2.71.195	10.2.71.195
227	10.2.71.196/31	10.2.71.196 – 10.2.71.197	10.2.71.197
228	10.2.71.198/31	10.2.71.198 – 10.2.71.199	10.2.71.199
229	10.2.71.200/31	10.2.71.200 – 10.2.71.201	10.2.71.201
230	10.2.71.202/31	10.2.71.202 – 10.2.71.203	10.2.71.203
231	10.2.71.204/31	10.2.71.204 – 10.2.71.205	10.2.71.205
232	10.2.71.206/31	10.2.71.206 – 10.2.71.207	10.2.71.207
233	10.2.71.208/31	10.2.71.208 – 10.2.71.209	10.2.71.209
234	10.2.71.210/31	10.2.71.210 – 10.2.71.211	10.2.71.211
235	10.2.71.212/31	10.2.71.212 – 10.2.71.213	10.2.71.213
236	10.2.71.214/31	10.2.71.214 – 10.2.71.215	10.2.71.215
237	10.2.71.216/31	10.2.71.216 – 10.2.71.217	10.2.71.217
238	10.2.71.218/31	10.2.71.218 – 10.2.71.219	10.2.71.219
239	10.2.71.220/31	10.2.71.220 – 10.2.71.221	10.2.71.221
240	10.2.71.222/31	10.2.71.222 – 10.2.71.223	10.2.71.223
241	10.2.71.224/31	10.2.71.224 – 10.2.71.225	10.2.71.225
242	10.2.71.226/31	10.2.71.226 – 10.2.71.227	10.2.71.227
243	10.2.71.228/31	10.2.71.228 – 10.2.71.229	10.2.71.229
244	10.2.71.230/31	10.2.71.230 – 10.2.71.231	10.2.71.231
245	10.2.71.232/31	10.2.71.232 – 10.2.71.233	10.2.71.233
246	10.2.71.234/31	10.2.71.234 – 10.2.71.235	10.2.71.235
247	10.2.71.236/31	10.2.71.236 – 10.2.71.237	10.2.71.237
248	10.2.71.238/31	10.2.71.238 – 10.2.71.239	10.2.71.239
249	10.2.71.240/31	10.2.71.240 – 10.2.71.241	10.2.71.241
250	10.2.71.242/31	10.2.71.242 – 10.2.71.243	10.2.71.243
251	10.2.71.244/31	10.2.71.244 – 10.2.71.245	10.2.71.245
252	10.2.71.246/31	10.2.71.246 – 10.2.71.247	10.2.71.247
253	10.2.71.248/31	10.2.71.248 – 10.2.71.249	10.2.71.249
254	10.2.71.250/31	10.2.71.250 – 10.2.71.251	10.2.71.251
255	10.2.71.252/31	10.2.71.252 – 10.2.71.253	10.2.71.253
256	10.2.71.254/31	10.2.71.254 – 10.2.71.255	10.2.71.255

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 →