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)10.71.16.0/22

network10.71.16.0/22

broadcast10.71.19.255

first host10.71.16.1

last host10.71.19.254

subnet mask255.255.252.0

wildcard0.0.3.255

addresses1,024

usable hosts1,022

classA

ipcalc 10.71.16.0/22

address00001010.01000111.00010000.00000000

subnet mask11111111.11111111.11111100.00000000

network00001010.01000111.00010000.00000000

broadcast00001010.01000111.00010011.11111111

green = network part, grey = host part

hex0x0a471000

decimal172429312

reverse dns0.16.71.10.in-addr.arpa

ipv4-mapped::ffff:a47:1000

/22 split into /30 · 256 subnets

close ×

#	network	host range	broadcast
1	10.71.16.0/30	10.71.16.1 – 10.71.16.2	10.71.16.3
2	10.71.16.4/30	10.71.16.5 – 10.71.16.6	10.71.16.7
3	10.71.16.8/30	10.71.16.9 – 10.71.16.10	10.71.16.11
4	10.71.16.12/30	10.71.16.13 – 10.71.16.14	10.71.16.15
5	10.71.16.16/30	10.71.16.17 – 10.71.16.18	10.71.16.19
6	10.71.16.20/30	10.71.16.21 – 10.71.16.22	10.71.16.23
7	10.71.16.24/30	10.71.16.25 – 10.71.16.26	10.71.16.27
8	10.71.16.28/30	10.71.16.29 – 10.71.16.30	10.71.16.31
9	10.71.16.32/30	10.71.16.33 – 10.71.16.34	10.71.16.35
10	10.71.16.36/30	10.71.16.37 – 10.71.16.38	10.71.16.39
11	10.71.16.40/30	10.71.16.41 – 10.71.16.42	10.71.16.43
12	10.71.16.44/30	10.71.16.45 – 10.71.16.46	10.71.16.47
13	10.71.16.48/30	10.71.16.49 – 10.71.16.50	10.71.16.51
14	10.71.16.52/30	10.71.16.53 – 10.71.16.54	10.71.16.55
15	10.71.16.56/30	10.71.16.57 – 10.71.16.58	10.71.16.59
16	10.71.16.60/30	10.71.16.61 – 10.71.16.62	10.71.16.63
17	10.71.16.64/30	10.71.16.65 – 10.71.16.66	10.71.16.67
18	10.71.16.68/30	10.71.16.69 – 10.71.16.70	10.71.16.71
19	10.71.16.72/30	10.71.16.73 – 10.71.16.74	10.71.16.75
20	10.71.16.76/30	10.71.16.77 – 10.71.16.78	10.71.16.79
21	10.71.16.80/30	10.71.16.81 – 10.71.16.82	10.71.16.83
22	10.71.16.84/30	10.71.16.85 – 10.71.16.86	10.71.16.87
23	10.71.16.88/30	10.71.16.89 – 10.71.16.90	10.71.16.91
24	10.71.16.92/30	10.71.16.93 – 10.71.16.94	10.71.16.95
25	10.71.16.96/30	10.71.16.97 – 10.71.16.98	10.71.16.99
26	10.71.16.100/30	10.71.16.101 – 10.71.16.102	10.71.16.103
27	10.71.16.104/30	10.71.16.105 – 10.71.16.106	10.71.16.107
28	10.71.16.108/30	10.71.16.109 – 10.71.16.110	10.71.16.111
29	10.71.16.112/30	10.71.16.113 – 10.71.16.114	10.71.16.115
30	10.71.16.116/30	10.71.16.117 – 10.71.16.118	10.71.16.119
31	10.71.16.120/30	10.71.16.121 – 10.71.16.122	10.71.16.123
32	10.71.16.124/30	10.71.16.125 – 10.71.16.126	10.71.16.127
33	10.71.16.128/30	10.71.16.129 – 10.71.16.130	10.71.16.131
34	10.71.16.132/30	10.71.16.133 – 10.71.16.134	10.71.16.135
35	10.71.16.136/30	10.71.16.137 – 10.71.16.138	10.71.16.139
36	10.71.16.140/30	10.71.16.141 – 10.71.16.142	10.71.16.143
37	10.71.16.144/30	10.71.16.145 – 10.71.16.146	10.71.16.147
38	10.71.16.148/30	10.71.16.149 – 10.71.16.150	10.71.16.151
39	10.71.16.152/30	10.71.16.153 – 10.71.16.154	10.71.16.155
40	10.71.16.156/30	10.71.16.157 – 10.71.16.158	10.71.16.159
41	10.71.16.160/30	10.71.16.161 – 10.71.16.162	10.71.16.163
42	10.71.16.164/30	10.71.16.165 – 10.71.16.166	10.71.16.167
43	10.71.16.168/30	10.71.16.169 – 10.71.16.170	10.71.16.171
44	10.71.16.172/30	10.71.16.173 – 10.71.16.174	10.71.16.175
45	10.71.16.176/30	10.71.16.177 – 10.71.16.178	10.71.16.179
46	10.71.16.180/30	10.71.16.181 – 10.71.16.182	10.71.16.183
47	10.71.16.184/30	10.71.16.185 – 10.71.16.186	10.71.16.187
48	10.71.16.188/30	10.71.16.189 – 10.71.16.190	10.71.16.191
49	10.71.16.192/30	10.71.16.193 – 10.71.16.194	10.71.16.195
50	10.71.16.196/30	10.71.16.197 – 10.71.16.198	10.71.16.199
51	10.71.16.200/30	10.71.16.201 – 10.71.16.202	10.71.16.203
52	10.71.16.204/30	10.71.16.205 – 10.71.16.206	10.71.16.207
53	10.71.16.208/30	10.71.16.209 – 10.71.16.210	10.71.16.211
54	10.71.16.212/30	10.71.16.213 – 10.71.16.214	10.71.16.215
55	10.71.16.216/30	10.71.16.217 – 10.71.16.218	10.71.16.219
56	10.71.16.220/30	10.71.16.221 – 10.71.16.222	10.71.16.223
57	10.71.16.224/30	10.71.16.225 – 10.71.16.226	10.71.16.227
58	10.71.16.228/30	10.71.16.229 – 10.71.16.230	10.71.16.231
59	10.71.16.232/30	10.71.16.233 – 10.71.16.234	10.71.16.235
60	10.71.16.236/30	10.71.16.237 – 10.71.16.238	10.71.16.239
61	10.71.16.240/30	10.71.16.241 – 10.71.16.242	10.71.16.243
62	10.71.16.244/30	10.71.16.245 – 10.71.16.246	10.71.16.247
63	10.71.16.248/30	10.71.16.249 – 10.71.16.250	10.71.16.251
64	10.71.16.252/30	10.71.16.253 – 10.71.16.254	10.71.16.255
65	10.71.17.0/30	10.71.17.1 – 10.71.17.2	10.71.17.3
66	10.71.17.4/30	10.71.17.5 – 10.71.17.6	10.71.17.7
67	10.71.17.8/30	10.71.17.9 – 10.71.17.10	10.71.17.11
68	10.71.17.12/30	10.71.17.13 – 10.71.17.14	10.71.17.15
69	10.71.17.16/30	10.71.17.17 – 10.71.17.18	10.71.17.19
70	10.71.17.20/30	10.71.17.21 – 10.71.17.22	10.71.17.23
71	10.71.17.24/30	10.71.17.25 – 10.71.17.26	10.71.17.27
72	10.71.17.28/30	10.71.17.29 – 10.71.17.30	10.71.17.31
73	10.71.17.32/30	10.71.17.33 – 10.71.17.34	10.71.17.35
74	10.71.17.36/30	10.71.17.37 – 10.71.17.38	10.71.17.39
75	10.71.17.40/30	10.71.17.41 – 10.71.17.42	10.71.17.43
76	10.71.17.44/30	10.71.17.45 – 10.71.17.46	10.71.17.47
77	10.71.17.48/30	10.71.17.49 – 10.71.17.50	10.71.17.51
78	10.71.17.52/30	10.71.17.53 – 10.71.17.54	10.71.17.55
79	10.71.17.56/30	10.71.17.57 – 10.71.17.58	10.71.17.59
80	10.71.17.60/30	10.71.17.61 – 10.71.17.62	10.71.17.63
81	10.71.17.64/30	10.71.17.65 – 10.71.17.66	10.71.17.67
82	10.71.17.68/30	10.71.17.69 – 10.71.17.70	10.71.17.71
83	10.71.17.72/30	10.71.17.73 – 10.71.17.74	10.71.17.75
84	10.71.17.76/30	10.71.17.77 – 10.71.17.78	10.71.17.79
85	10.71.17.80/30	10.71.17.81 – 10.71.17.82	10.71.17.83
86	10.71.17.84/30	10.71.17.85 – 10.71.17.86	10.71.17.87
87	10.71.17.88/30	10.71.17.89 – 10.71.17.90	10.71.17.91
88	10.71.17.92/30	10.71.17.93 – 10.71.17.94	10.71.17.95
89	10.71.17.96/30	10.71.17.97 – 10.71.17.98	10.71.17.99
90	10.71.17.100/30	10.71.17.101 – 10.71.17.102	10.71.17.103
91	10.71.17.104/30	10.71.17.105 – 10.71.17.106	10.71.17.107
92	10.71.17.108/30	10.71.17.109 – 10.71.17.110	10.71.17.111
93	10.71.17.112/30	10.71.17.113 – 10.71.17.114	10.71.17.115
94	10.71.17.116/30	10.71.17.117 – 10.71.17.118	10.71.17.119
95	10.71.17.120/30	10.71.17.121 – 10.71.17.122	10.71.17.123
96	10.71.17.124/30	10.71.17.125 – 10.71.17.126	10.71.17.127
97	10.71.17.128/30	10.71.17.129 – 10.71.17.130	10.71.17.131
98	10.71.17.132/30	10.71.17.133 – 10.71.17.134	10.71.17.135
99	10.71.17.136/30	10.71.17.137 – 10.71.17.138	10.71.17.139
100	10.71.17.140/30	10.71.17.141 – 10.71.17.142	10.71.17.143
101	10.71.17.144/30	10.71.17.145 – 10.71.17.146	10.71.17.147
102	10.71.17.148/30	10.71.17.149 – 10.71.17.150	10.71.17.151
103	10.71.17.152/30	10.71.17.153 – 10.71.17.154	10.71.17.155
104	10.71.17.156/30	10.71.17.157 – 10.71.17.158	10.71.17.159
105	10.71.17.160/30	10.71.17.161 – 10.71.17.162	10.71.17.163
106	10.71.17.164/30	10.71.17.165 – 10.71.17.166	10.71.17.167
107	10.71.17.168/30	10.71.17.169 – 10.71.17.170	10.71.17.171
108	10.71.17.172/30	10.71.17.173 – 10.71.17.174	10.71.17.175
109	10.71.17.176/30	10.71.17.177 – 10.71.17.178	10.71.17.179
110	10.71.17.180/30	10.71.17.181 – 10.71.17.182	10.71.17.183
111	10.71.17.184/30	10.71.17.185 – 10.71.17.186	10.71.17.187
112	10.71.17.188/30	10.71.17.189 – 10.71.17.190	10.71.17.191
113	10.71.17.192/30	10.71.17.193 – 10.71.17.194	10.71.17.195
114	10.71.17.196/30	10.71.17.197 – 10.71.17.198	10.71.17.199
115	10.71.17.200/30	10.71.17.201 – 10.71.17.202	10.71.17.203
116	10.71.17.204/30	10.71.17.205 – 10.71.17.206	10.71.17.207
117	10.71.17.208/30	10.71.17.209 – 10.71.17.210	10.71.17.211
118	10.71.17.212/30	10.71.17.213 – 10.71.17.214	10.71.17.215
119	10.71.17.216/30	10.71.17.217 – 10.71.17.218	10.71.17.219
120	10.71.17.220/30	10.71.17.221 – 10.71.17.222	10.71.17.223
121	10.71.17.224/30	10.71.17.225 – 10.71.17.226	10.71.17.227
122	10.71.17.228/30	10.71.17.229 – 10.71.17.230	10.71.17.231
123	10.71.17.232/30	10.71.17.233 – 10.71.17.234	10.71.17.235
124	10.71.17.236/30	10.71.17.237 – 10.71.17.238	10.71.17.239
125	10.71.17.240/30	10.71.17.241 – 10.71.17.242	10.71.17.243
126	10.71.17.244/30	10.71.17.245 – 10.71.17.246	10.71.17.247
127	10.71.17.248/30	10.71.17.249 – 10.71.17.250	10.71.17.251
128	10.71.17.252/30	10.71.17.253 – 10.71.17.254	10.71.17.255
129	10.71.18.0/30	10.71.18.1 – 10.71.18.2	10.71.18.3
130	10.71.18.4/30	10.71.18.5 – 10.71.18.6	10.71.18.7
131	10.71.18.8/30	10.71.18.9 – 10.71.18.10	10.71.18.11
132	10.71.18.12/30	10.71.18.13 – 10.71.18.14	10.71.18.15
133	10.71.18.16/30	10.71.18.17 – 10.71.18.18	10.71.18.19
134	10.71.18.20/30	10.71.18.21 – 10.71.18.22	10.71.18.23
135	10.71.18.24/30	10.71.18.25 – 10.71.18.26	10.71.18.27
136	10.71.18.28/30	10.71.18.29 – 10.71.18.30	10.71.18.31
137	10.71.18.32/30	10.71.18.33 – 10.71.18.34	10.71.18.35
138	10.71.18.36/30	10.71.18.37 – 10.71.18.38	10.71.18.39
139	10.71.18.40/30	10.71.18.41 – 10.71.18.42	10.71.18.43
140	10.71.18.44/30	10.71.18.45 – 10.71.18.46	10.71.18.47
141	10.71.18.48/30	10.71.18.49 – 10.71.18.50	10.71.18.51
142	10.71.18.52/30	10.71.18.53 – 10.71.18.54	10.71.18.55
143	10.71.18.56/30	10.71.18.57 – 10.71.18.58	10.71.18.59
144	10.71.18.60/30	10.71.18.61 – 10.71.18.62	10.71.18.63
145	10.71.18.64/30	10.71.18.65 – 10.71.18.66	10.71.18.67
146	10.71.18.68/30	10.71.18.69 – 10.71.18.70	10.71.18.71
147	10.71.18.72/30	10.71.18.73 – 10.71.18.74	10.71.18.75
148	10.71.18.76/30	10.71.18.77 – 10.71.18.78	10.71.18.79
149	10.71.18.80/30	10.71.18.81 – 10.71.18.82	10.71.18.83
150	10.71.18.84/30	10.71.18.85 – 10.71.18.86	10.71.18.87
151	10.71.18.88/30	10.71.18.89 – 10.71.18.90	10.71.18.91
152	10.71.18.92/30	10.71.18.93 – 10.71.18.94	10.71.18.95
153	10.71.18.96/30	10.71.18.97 – 10.71.18.98	10.71.18.99
154	10.71.18.100/30	10.71.18.101 – 10.71.18.102	10.71.18.103
155	10.71.18.104/30	10.71.18.105 – 10.71.18.106	10.71.18.107
156	10.71.18.108/30	10.71.18.109 – 10.71.18.110	10.71.18.111
157	10.71.18.112/30	10.71.18.113 – 10.71.18.114	10.71.18.115
158	10.71.18.116/30	10.71.18.117 – 10.71.18.118	10.71.18.119
159	10.71.18.120/30	10.71.18.121 – 10.71.18.122	10.71.18.123
160	10.71.18.124/30	10.71.18.125 – 10.71.18.126	10.71.18.127
161	10.71.18.128/30	10.71.18.129 – 10.71.18.130	10.71.18.131
162	10.71.18.132/30	10.71.18.133 – 10.71.18.134	10.71.18.135
163	10.71.18.136/30	10.71.18.137 – 10.71.18.138	10.71.18.139
164	10.71.18.140/30	10.71.18.141 – 10.71.18.142	10.71.18.143
165	10.71.18.144/30	10.71.18.145 – 10.71.18.146	10.71.18.147
166	10.71.18.148/30	10.71.18.149 – 10.71.18.150	10.71.18.151
167	10.71.18.152/30	10.71.18.153 – 10.71.18.154	10.71.18.155
168	10.71.18.156/30	10.71.18.157 – 10.71.18.158	10.71.18.159
169	10.71.18.160/30	10.71.18.161 – 10.71.18.162	10.71.18.163
170	10.71.18.164/30	10.71.18.165 – 10.71.18.166	10.71.18.167
171	10.71.18.168/30	10.71.18.169 – 10.71.18.170	10.71.18.171
172	10.71.18.172/30	10.71.18.173 – 10.71.18.174	10.71.18.175
173	10.71.18.176/30	10.71.18.177 – 10.71.18.178	10.71.18.179
174	10.71.18.180/30	10.71.18.181 – 10.71.18.182	10.71.18.183
175	10.71.18.184/30	10.71.18.185 – 10.71.18.186	10.71.18.187
176	10.71.18.188/30	10.71.18.189 – 10.71.18.190	10.71.18.191
177	10.71.18.192/30	10.71.18.193 – 10.71.18.194	10.71.18.195
178	10.71.18.196/30	10.71.18.197 – 10.71.18.198	10.71.18.199
179	10.71.18.200/30	10.71.18.201 – 10.71.18.202	10.71.18.203
180	10.71.18.204/30	10.71.18.205 – 10.71.18.206	10.71.18.207
181	10.71.18.208/30	10.71.18.209 – 10.71.18.210	10.71.18.211
182	10.71.18.212/30	10.71.18.213 – 10.71.18.214	10.71.18.215
183	10.71.18.216/30	10.71.18.217 – 10.71.18.218	10.71.18.219
184	10.71.18.220/30	10.71.18.221 – 10.71.18.222	10.71.18.223
185	10.71.18.224/30	10.71.18.225 – 10.71.18.226	10.71.18.227
186	10.71.18.228/30	10.71.18.229 – 10.71.18.230	10.71.18.231
187	10.71.18.232/30	10.71.18.233 – 10.71.18.234	10.71.18.235
188	10.71.18.236/30	10.71.18.237 – 10.71.18.238	10.71.18.239
189	10.71.18.240/30	10.71.18.241 – 10.71.18.242	10.71.18.243
190	10.71.18.244/30	10.71.18.245 – 10.71.18.246	10.71.18.247
191	10.71.18.248/30	10.71.18.249 – 10.71.18.250	10.71.18.251
192	10.71.18.252/30	10.71.18.253 – 10.71.18.254	10.71.18.255
193	10.71.19.0/30	10.71.19.1 – 10.71.19.2	10.71.19.3
194	10.71.19.4/30	10.71.19.5 – 10.71.19.6	10.71.19.7
195	10.71.19.8/30	10.71.19.9 – 10.71.19.10	10.71.19.11
196	10.71.19.12/30	10.71.19.13 – 10.71.19.14	10.71.19.15
197	10.71.19.16/30	10.71.19.17 – 10.71.19.18	10.71.19.19
198	10.71.19.20/30	10.71.19.21 – 10.71.19.22	10.71.19.23
199	10.71.19.24/30	10.71.19.25 – 10.71.19.26	10.71.19.27
200	10.71.19.28/30	10.71.19.29 – 10.71.19.30	10.71.19.31
201	10.71.19.32/30	10.71.19.33 – 10.71.19.34	10.71.19.35
202	10.71.19.36/30	10.71.19.37 – 10.71.19.38	10.71.19.39
203	10.71.19.40/30	10.71.19.41 – 10.71.19.42	10.71.19.43
204	10.71.19.44/30	10.71.19.45 – 10.71.19.46	10.71.19.47
205	10.71.19.48/30	10.71.19.49 – 10.71.19.50	10.71.19.51
206	10.71.19.52/30	10.71.19.53 – 10.71.19.54	10.71.19.55
207	10.71.19.56/30	10.71.19.57 – 10.71.19.58	10.71.19.59
208	10.71.19.60/30	10.71.19.61 – 10.71.19.62	10.71.19.63
209	10.71.19.64/30	10.71.19.65 – 10.71.19.66	10.71.19.67
210	10.71.19.68/30	10.71.19.69 – 10.71.19.70	10.71.19.71
211	10.71.19.72/30	10.71.19.73 – 10.71.19.74	10.71.19.75
212	10.71.19.76/30	10.71.19.77 – 10.71.19.78	10.71.19.79
213	10.71.19.80/30	10.71.19.81 – 10.71.19.82	10.71.19.83
214	10.71.19.84/30	10.71.19.85 – 10.71.19.86	10.71.19.87
215	10.71.19.88/30	10.71.19.89 – 10.71.19.90	10.71.19.91
216	10.71.19.92/30	10.71.19.93 – 10.71.19.94	10.71.19.95
217	10.71.19.96/30	10.71.19.97 – 10.71.19.98	10.71.19.99
218	10.71.19.100/30	10.71.19.101 – 10.71.19.102	10.71.19.103
219	10.71.19.104/30	10.71.19.105 – 10.71.19.106	10.71.19.107
220	10.71.19.108/30	10.71.19.109 – 10.71.19.110	10.71.19.111
221	10.71.19.112/30	10.71.19.113 – 10.71.19.114	10.71.19.115
222	10.71.19.116/30	10.71.19.117 – 10.71.19.118	10.71.19.119
223	10.71.19.120/30	10.71.19.121 – 10.71.19.122	10.71.19.123
224	10.71.19.124/30	10.71.19.125 – 10.71.19.126	10.71.19.127
225	10.71.19.128/30	10.71.19.129 – 10.71.19.130	10.71.19.131
226	10.71.19.132/30	10.71.19.133 – 10.71.19.134	10.71.19.135
227	10.71.19.136/30	10.71.19.137 – 10.71.19.138	10.71.19.139
228	10.71.19.140/30	10.71.19.141 – 10.71.19.142	10.71.19.143
229	10.71.19.144/30	10.71.19.145 – 10.71.19.146	10.71.19.147
230	10.71.19.148/30	10.71.19.149 – 10.71.19.150	10.71.19.151
231	10.71.19.152/30	10.71.19.153 – 10.71.19.154	10.71.19.155
232	10.71.19.156/30	10.71.19.157 – 10.71.19.158	10.71.19.159
233	10.71.19.160/30	10.71.19.161 – 10.71.19.162	10.71.19.163
234	10.71.19.164/30	10.71.19.165 – 10.71.19.166	10.71.19.167
235	10.71.19.168/30	10.71.19.169 – 10.71.19.170	10.71.19.171
236	10.71.19.172/30	10.71.19.173 – 10.71.19.174	10.71.19.175
237	10.71.19.176/30	10.71.19.177 – 10.71.19.178	10.71.19.179
238	10.71.19.180/30	10.71.19.181 – 10.71.19.182	10.71.19.183
239	10.71.19.184/30	10.71.19.185 – 10.71.19.186	10.71.19.187
240	10.71.19.188/30	10.71.19.189 – 10.71.19.190	10.71.19.191
241	10.71.19.192/30	10.71.19.193 – 10.71.19.194	10.71.19.195
242	10.71.19.196/30	10.71.19.197 – 10.71.19.198	10.71.19.199
243	10.71.19.200/30	10.71.19.201 – 10.71.19.202	10.71.19.203
244	10.71.19.204/30	10.71.19.205 – 10.71.19.206	10.71.19.207
245	10.71.19.208/30	10.71.19.209 – 10.71.19.210	10.71.19.211
246	10.71.19.212/30	10.71.19.213 – 10.71.19.214	10.71.19.215
247	10.71.19.216/30	10.71.19.217 – 10.71.19.218	10.71.19.219
248	10.71.19.220/30	10.71.19.221 – 10.71.19.222	10.71.19.223
249	10.71.19.224/30	10.71.19.225 – 10.71.19.226	10.71.19.227
250	10.71.19.228/30	10.71.19.229 – 10.71.19.230	10.71.19.231
251	10.71.19.232/30	10.71.19.233 – 10.71.19.234	10.71.19.235
252	10.71.19.236/30	10.71.19.237 – 10.71.19.238	10.71.19.239
253	10.71.19.240/30	10.71.19.241 – 10.71.19.242	10.71.19.243
254	10.71.19.244/30	10.71.19.245 – 10.71.19.246	10.71.19.247
255	10.71.19.248/30	10.71.19.249 – 10.71.19.250	10.71.19.251
256	10.71.19.252/30	10.71.19.253 – 10.71.19.254	10.71.19.255

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 /22
/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	1
/23	255.255.254.0	512	510	2 split →
/24	255.255.255.0	256	254	4 split →
/25	255.255.255.128	128	126	8 split →
/26	255.255.255.192	64	62	16 split →
/27	255.255.255.224	32	30	32 split →
/28	255.255.255.240	16	14	64 split →
/29	255.255.255.248	8	6	128 split →
/30	255.255.255.252	4	2	256 split →
/31	255.255.255.254	2	2	512 split →
/32	255.255.255.255	1	1	1,024 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 →