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)10.0.20.0/22

network10.0.20.0/22

broadcast10.0.23.255

first host10.0.20.1

last host10.0.23.254

subnet mask255.255.252.0

wildcard0.0.3.255

addresses1,024

usable hosts1,022

classA

ipcalc 10.0.20.0/22

address00001010.00000000.00010100.00000000

subnet mask11111111.11111111.11111100.00000000

network00001010.00000000.00010100.00000000

broadcast00001010.00000000.00010111.11111111

green = network part, grey = host part

hex0x0a001400

decimal167777280

reverse dns0.20.0.10.in-addr.arpa

ipv4-mapped::ffff:a00:1400

/22 split into /30 · 256 subnets

close ×

#	network	host range	broadcast
1	10.0.20.0/30	10.0.20.1 – 10.0.20.2	10.0.20.3
2	10.0.20.4/30	10.0.20.5 – 10.0.20.6	10.0.20.7
3	10.0.20.8/30	10.0.20.9 – 10.0.20.10	10.0.20.11
4	10.0.20.12/30	10.0.20.13 – 10.0.20.14	10.0.20.15
5	10.0.20.16/30	10.0.20.17 – 10.0.20.18	10.0.20.19
6	10.0.20.20/30	10.0.20.21 – 10.0.20.22	10.0.20.23
7	10.0.20.24/30	10.0.20.25 – 10.0.20.26	10.0.20.27
8	10.0.20.28/30	10.0.20.29 – 10.0.20.30	10.0.20.31
9	10.0.20.32/30	10.0.20.33 – 10.0.20.34	10.0.20.35
10	10.0.20.36/30	10.0.20.37 – 10.0.20.38	10.0.20.39
11	10.0.20.40/30	10.0.20.41 – 10.0.20.42	10.0.20.43
12	10.0.20.44/30	10.0.20.45 – 10.0.20.46	10.0.20.47
13	10.0.20.48/30	10.0.20.49 – 10.0.20.50	10.0.20.51
14	10.0.20.52/30	10.0.20.53 – 10.0.20.54	10.0.20.55
15	10.0.20.56/30	10.0.20.57 – 10.0.20.58	10.0.20.59
16	10.0.20.60/30	10.0.20.61 – 10.0.20.62	10.0.20.63
17	10.0.20.64/30	10.0.20.65 – 10.0.20.66	10.0.20.67
18	10.0.20.68/30	10.0.20.69 – 10.0.20.70	10.0.20.71
19	10.0.20.72/30	10.0.20.73 – 10.0.20.74	10.0.20.75
20	10.0.20.76/30	10.0.20.77 – 10.0.20.78	10.0.20.79
21	10.0.20.80/30	10.0.20.81 – 10.0.20.82	10.0.20.83
22	10.0.20.84/30	10.0.20.85 – 10.0.20.86	10.0.20.87
23	10.0.20.88/30	10.0.20.89 – 10.0.20.90	10.0.20.91
24	10.0.20.92/30	10.0.20.93 – 10.0.20.94	10.0.20.95
25	10.0.20.96/30	10.0.20.97 – 10.0.20.98	10.0.20.99
26	10.0.20.100/30	10.0.20.101 – 10.0.20.102	10.0.20.103
27	10.0.20.104/30	10.0.20.105 – 10.0.20.106	10.0.20.107
28	10.0.20.108/30	10.0.20.109 – 10.0.20.110	10.0.20.111
29	10.0.20.112/30	10.0.20.113 – 10.0.20.114	10.0.20.115
30	10.0.20.116/30	10.0.20.117 – 10.0.20.118	10.0.20.119
31	10.0.20.120/30	10.0.20.121 – 10.0.20.122	10.0.20.123
32	10.0.20.124/30	10.0.20.125 – 10.0.20.126	10.0.20.127
33	10.0.20.128/30	10.0.20.129 – 10.0.20.130	10.0.20.131
34	10.0.20.132/30	10.0.20.133 – 10.0.20.134	10.0.20.135
35	10.0.20.136/30	10.0.20.137 – 10.0.20.138	10.0.20.139
36	10.0.20.140/30	10.0.20.141 – 10.0.20.142	10.0.20.143
37	10.0.20.144/30	10.0.20.145 – 10.0.20.146	10.0.20.147
38	10.0.20.148/30	10.0.20.149 – 10.0.20.150	10.0.20.151
39	10.0.20.152/30	10.0.20.153 – 10.0.20.154	10.0.20.155
40	10.0.20.156/30	10.0.20.157 – 10.0.20.158	10.0.20.159
41	10.0.20.160/30	10.0.20.161 – 10.0.20.162	10.0.20.163
42	10.0.20.164/30	10.0.20.165 – 10.0.20.166	10.0.20.167
43	10.0.20.168/30	10.0.20.169 – 10.0.20.170	10.0.20.171
44	10.0.20.172/30	10.0.20.173 – 10.0.20.174	10.0.20.175
45	10.0.20.176/30	10.0.20.177 – 10.0.20.178	10.0.20.179
46	10.0.20.180/30	10.0.20.181 – 10.0.20.182	10.0.20.183
47	10.0.20.184/30	10.0.20.185 – 10.0.20.186	10.0.20.187
48	10.0.20.188/30	10.0.20.189 – 10.0.20.190	10.0.20.191
49	10.0.20.192/30	10.0.20.193 – 10.0.20.194	10.0.20.195
50	10.0.20.196/30	10.0.20.197 – 10.0.20.198	10.0.20.199
51	10.0.20.200/30	10.0.20.201 – 10.0.20.202	10.0.20.203
52	10.0.20.204/30	10.0.20.205 – 10.0.20.206	10.0.20.207
53	10.0.20.208/30	10.0.20.209 – 10.0.20.210	10.0.20.211
54	10.0.20.212/30	10.0.20.213 – 10.0.20.214	10.0.20.215
55	10.0.20.216/30	10.0.20.217 – 10.0.20.218	10.0.20.219
56	10.0.20.220/30	10.0.20.221 – 10.0.20.222	10.0.20.223
57	10.0.20.224/30	10.0.20.225 – 10.0.20.226	10.0.20.227
58	10.0.20.228/30	10.0.20.229 – 10.0.20.230	10.0.20.231
59	10.0.20.232/30	10.0.20.233 – 10.0.20.234	10.0.20.235
60	10.0.20.236/30	10.0.20.237 – 10.0.20.238	10.0.20.239
61	10.0.20.240/30	10.0.20.241 – 10.0.20.242	10.0.20.243
62	10.0.20.244/30	10.0.20.245 – 10.0.20.246	10.0.20.247
63	10.0.20.248/30	10.0.20.249 – 10.0.20.250	10.0.20.251
64	10.0.20.252/30	10.0.20.253 – 10.0.20.254	10.0.20.255
65	10.0.21.0/30	10.0.21.1 – 10.0.21.2	10.0.21.3
66	10.0.21.4/30	10.0.21.5 – 10.0.21.6	10.0.21.7
67	10.0.21.8/30	10.0.21.9 – 10.0.21.10	10.0.21.11
68	10.0.21.12/30	10.0.21.13 – 10.0.21.14	10.0.21.15
69	10.0.21.16/30	10.0.21.17 – 10.0.21.18	10.0.21.19
70	10.0.21.20/30	10.0.21.21 – 10.0.21.22	10.0.21.23
71	10.0.21.24/30	10.0.21.25 – 10.0.21.26	10.0.21.27
72	10.0.21.28/30	10.0.21.29 – 10.0.21.30	10.0.21.31
73	10.0.21.32/30	10.0.21.33 – 10.0.21.34	10.0.21.35
74	10.0.21.36/30	10.0.21.37 – 10.0.21.38	10.0.21.39
75	10.0.21.40/30	10.0.21.41 – 10.0.21.42	10.0.21.43
76	10.0.21.44/30	10.0.21.45 – 10.0.21.46	10.0.21.47
77	10.0.21.48/30	10.0.21.49 – 10.0.21.50	10.0.21.51
78	10.0.21.52/30	10.0.21.53 – 10.0.21.54	10.0.21.55
79	10.0.21.56/30	10.0.21.57 – 10.0.21.58	10.0.21.59
80	10.0.21.60/30	10.0.21.61 – 10.0.21.62	10.0.21.63
81	10.0.21.64/30	10.0.21.65 – 10.0.21.66	10.0.21.67
82	10.0.21.68/30	10.0.21.69 – 10.0.21.70	10.0.21.71
83	10.0.21.72/30	10.0.21.73 – 10.0.21.74	10.0.21.75
84	10.0.21.76/30	10.0.21.77 – 10.0.21.78	10.0.21.79
85	10.0.21.80/30	10.0.21.81 – 10.0.21.82	10.0.21.83
86	10.0.21.84/30	10.0.21.85 – 10.0.21.86	10.0.21.87
87	10.0.21.88/30	10.0.21.89 – 10.0.21.90	10.0.21.91
88	10.0.21.92/30	10.0.21.93 – 10.0.21.94	10.0.21.95
89	10.0.21.96/30	10.0.21.97 – 10.0.21.98	10.0.21.99
90	10.0.21.100/30	10.0.21.101 – 10.0.21.102	10.0.21.103
91	10.0.21.104/30	10.0.21.105 – 10.0.21.106	10.0.21.107
92	10.0.21.108/30	10.0.21.109 – 10.0.21.110	10.0.21.111
93	10.0.21.112/30	10.0.21.113 – 10.0.21.114	10.0.21.115
94	10.0.21.116/30	10.0.21.117 – 10.0.21.118	10.0.21.119
95	10.0.21.120/30	10.0.21.121 – 10.0.21.122	10.0.21.123
96	10.0.21.124/30	10.0.21.125 – 10.0.21.126	10.0.21.127
97	10.0.21.128/30	10.0.21.129 – 10.0.21.130	10.0.21.131
98	10.0.21.132/30	10.0.21.133 – 10.0.21.134	10.0.21.135
99	10.0.21.136/30	10.0.21.137 – 10.0.21.138	10.0.21.139
100	10.0.21.140/30	10.0.21.141 – 10.0.21.142	10.0.21.143
101	10.0.21.144/30	10.0.21.145 – 10.0.21.146	10.0.21.147
102	10.0.21.148/30	10.0.21.149 – 10.0.21.150	10.0.21.151
103	10.0.21.152/30	10.0.21.153 – 10.0.21.154	10.0.21.155
104	10.0.21.156/30	10.0.21.157 – 10.0.21.158	10.0.21.159
105	10.0.21.160/30	10.0.21.161 – 10.0.21.162	10.0.21.163
106	10.0.21.164/30	10.0.21.165 – 10.0.21.166	10.0.21.167
107	10.0.21.168/30	10.0.21.169 – 10.0.21.170	10.0.21.171
108	10.0.21.172/30	10.0.21.173 – 10.0.21.174	10.0.21.175
109	10.0.21.176/30	10.0.21.177 – 10.0.21.178	10.0.21.179
110	10.0.21.180/30	10.0.21.181 – 10.0.21.182	10.0.21.183
111	10.0.21.184/30	10.0.21.185 – 10.0.21.186	10.0.21.187
112	10.0.21.188/30	10.0.21.189 – 10.0.21.190	10.0.21.191
113	10.0.21.192/30	10.0.21.193 – 10.0.21.194	10.0.21.195
114	10.0.21.196/30	10.0.21.197 – 10.0.21.198	10.0.21.199
115	10.0.21.200/30	10.0.21.201 – 10.0.21.202	10.0.21.203
116	10.0.21.204/30	10.0.21.205 – 10.0.21.206	10.0.21.207
117	10.0.21.208/30	10.0.21.209 – 10.0.21.210	10.0.21.211
118	10.0.21.212/30	10.0.21.213 – 10.0.21.214	10.0.21.215
119	10.0.21.216/30	10.0.21.217 – 10.0.21.218	10.0.21.219
120	10.0.21.220/30	10.0.21.221 – 10.0.21.222	10.0.21.223
121	10.0.21.224/30	10.0.21.225 – 10.0.21.226	10.0.21.227
122	10.0.21.228/30	10.0.21.229 – 10.0.21.230	10.0.21.231
123	10.0.21.232/30	10.0.21.233 – 10.0.21.234	10.0.21.235
124	10.0.21.236/30	10.0.21.237 – 10.0.21.238	10.0.21.239
125	10.0.21.240/30	10.0.21.241 – 10.0.21.242	10.0.21.243
126	10.0.21.244/30	10.0.21.245 – 10.0.21.246	10.0.21.247
127	10.0.21.248/30	10.0.21.249 – 10.0.21.250	10.0.21.251
128	10.0.21.252/30	10.0.21.253 – 10.0.21.254	10.0.21.255
129	10.0.22.0/30	10.0.22.1 – 10.0.22.2	10.0.22.3
130	10.0.22.4/30	10.0.22.5 – 10.0.22.6	10.0.22.7
131	10.0.22.8/30	10.0.22.9 – 10.0.22.10	10.0.22.11
132	10.0.22.12/30	10.0.22.13 – 10.0.22.14	10.0.22.15
133	10.0.22.16/30	10.0.22.17 – 10.0.22.18	10.0.22.19
134	10.0.22.20/30	10.0.22.21 – 10.0.22.22	10.0.22.23
135	10.0.22.24/30	10.0.22.25 – 10.0.22.26	10.0.22.27
136	10.0.22.28/30	10.0.22.29 – 10.0.22.30	10.0.22.31
137	10.0.22.32/30	10.0.22.33 – 10.0.22.34	10.0.22.35
138	10.0.22.36/30	10.0.22.37 – 10.0.22.38	10.0.22.39
139	10.0.22.40/30	10.0.22.41 – 10.0.22.42	10.0.22.43
140	10.0.22.44/30	10.0.22.45 – 10.0.22.46	10.0.22.47
141	10.0.22.48/30	10.0.22.49 – 10.0.22.50	10.0.22.51
142	10.0.22.52/30	10.0.22.53 – 10.0.22.54	10.0.22.55
143	10.0.22.56/30	10.0.22.57 – 10.0.22.58	10.0.22.59
144	10.0.22.60/30	10.0.22.61 – 10.0.22.62	10.0.22.63
145	10.0.22.64/30	10.0.22.65 – 10.0.22.66	10.0.22.67
146	10.0.22.68/30	10.0.22.69 – 10.0.22.70	10.0.22.71
147	10.0.22.72/30	10.0.22.73 – 10.0.22.74	10.0.22.75
148	10.0.22.76/30	10.0.22.77 – 10.0.22.78	10.0.22.79
149	10.0.22.80/30	10.0.22.81 – 10.0.22.82	10.0.22.83
150	10.0.22.84/30	10.0.22.85 – 10.0.22.86	10.0.22.87
151	10.0.22.88/30	10.0.22.89 – 10.0.22.90	10.0.22.91
152	10.0.22.92/30	10.0.22.93 – 10.0.22.94	10.0.22.95
153	10.0.22.96/30	10.0.22.97 – 10.0.22.98	10.0.22.99
154	10.0.22.100/30	10.0.22.101 – 10.0.22.102	10.0.22.103
155	10.0.22.104/30	10.0.22.105 – 10.0.22.106	10.0.22.107
156	10.0.22.108/30	10.0.22.109 – 10.0.22.110	10.0.22.111
157	10.0.22.112/30	10.0.22.113 – 10.0.22.114	10.0.22.115
158	10.0.22.116/30	10.0.22.117 – 10.0.22.118	10.0.22.119
159	10.0.22.120/30	10.0.22.121 – 10.0.22.122	10.0.22.123
160	10.0.22.124/30	10.0.22.125 – 10.0.22.126	10.0.22.127
161	10.0.22.128/30	10.0.22.129 – 10.0.22.130	10.0.22.131
162	10.0.22.132/30	10.0.22.133 – 10.0.22.134	10.0.22.135
163	10.0.22.136/30	10.0.22.137 – 10.0.22.138	10.0.22.139
164	10.0.22.140/30	10.0.22.141 – 10.0.22.142	10.0.22.143
165	10.0.22.144/30	10.0.22.145 – 10.0.22.146	10.0.22.147
166	10.0.22.148/30	10.0.22.149 – 10.0.22.150	10.0.22.151
167	10.0.22.152/30	10.0.22.153 – 10.0.22.154	10.0.22.155
168	10.0.22.156/30	10.0.22.157 – 10.0.22.158	10.0.22.159
169	10.0.22.160/30	10.0.22.161 – 10.0.22.162	10.0.22.163
170	10.0.22.164/30	10.0.22.165 – 10.0.22.166	10.0.22.167
171	10.0.22.168/30	10.0.22.169 – 10.0.22.170	10.0.22.171
172	10.0.22.172/30	10.0.22.173 – 10.0.22.174	10.0.22.175
173	10.0.22.176/30	10.0.22.177 – 10.0.22.178	10.0.22.179
174	10.0.22.180/30	10.0.22.181 – 10.0.22.182	10.0.22.183
175	10.0.22.184/30	10.0.22.185 – 10.0.22.186	10.0.22.187
176	10.0.22.188/30	10.0.22.189 – 10.0.22.190	10.0.22.191
177	10.0.22.192/30	10.0.22.193 – 10.0.22.194	10.0.22.195
178	10.0.22.196/30	10.0.22.197 – 10.0.22.198	10.0.22.199
179	10.0.22.200/30	10.0.22.201 – 10.0.22.202	10.0.22.203
180	10.0.22.204/30	10.0.22.205 – 10.0.22.206	10.0.22.207
181	10.0.22.208/30	10.0.22.209 – 10.0.22.210	10.0.22.211
182	10.0.22.212/30	10.0.22.213 – 10.0.22.214	10.0.22.215
183	10.0.22.216/30	10.0.22.217 – 10.0.22.218	10.0.22.219
184	10.0.22.220/30	10.0.22.221 – 10.0.22.222	10.0.22.223
185	10.0.22.224/30	10.0.22.225 – 10.0.22.226	10.0.22.227
186	10.0.22.228/30	10.0.22.229 – 10.0.22.230	10.0.22.231
187	10.0.22.232/30	10.0.22.233 – 10.0.22.234	10.0.22.235
188	10.0.22.236/30	10.0.22.237 – 10.0.22.238	10.0.22.239
189	10.0.22.240/30	10.0.22.241 – 10.0.22.242	10.0.22.243
190	10.0.22.244/30	10.0.22.245 – 10.0.22.246	10.0.22.247
191	10.0.22.248/30	10.0.22.249 – 10.0.22.250	10.0.22.251
192	10.0.22.252/30	10.0.22.253 – 10.0.22.254	10.0.22.255
193	10.0.23.0/30	10.0.23.1 – 10.0.23.2	10.0.23.3
194	10.0.23.4/30	10.0.23.5 – 10.0.23.6	10.0.23.7
195	10.0.23.8/30	10.0.23.9 – 10.0.23.10	10.0.23.11
196	10.0.23.12/30	10.0.23.13 – 10.0.23.14	10.0.23.15
197	10.0.23.16/30	10.0.23.17 – 10.0.23.18	10.0.23.19
198	10.0.23.20/30	10.0.23.21 – 10.0.23.22	10.0.23.23
199	10.0.23.24/30	10.0.23.25 – 10.0.23.26	10.0.23.27
200	10.0.23.28/30	10.0.23.29 – 10.0.23.30	10.0.23.31
201	10.0.23.32/30	10.0.23.33 – 10.0.23.34	10.0.23.35
202	10.0.23.36/30	10.0.23.37 – 10.0.23.38	10.0.23.39
203	10.0.23.40/30	10.0.23.41 – 10.0.23.42	10.0.23.43
204	10.0.23.44/30	10.0.23.45 – 10.0.23.46	10.0.23.47
205	10.0.23.48/30	10.0.23.49 – 10.0.23.50	10.0.23.51
206	10.0.23.52/30	10.0.23.53 – 10.0.23.54	10.0.23.55
207	10.0.23.56/30	10.0.23.57 – 10.0.23.58	10.0.23.59
208	10.0.23.60/30	10.0.23.61 – 10.0.23.62	10.0.23.63
209	10.0.23.64/30	10.0.23.65 – 10.0.23.66	10.0.23.67
210	10.0.23.68/30	10.0.23.69 – 10.0.23.70	10.0.23.71
211	10.0.23.72/30	10.0.23.73 – 10.0.23.74	10.0.23.75
212	10.0.23.76/30	10.0.23.77 – 10.0.23.78	10.0.23.79
213	10.0.23.80/30	10.0.23.81 – 10.0.23.82	10.0.23.83
214	10.0.23.84/30	10.0.23.85 – 10.0.23.86	10.0.23.87
215	10.0.23.88/30	10.0.23.89 – 10.0.23.90	10.0.23.91
216	10.0.23.92/30	10.0.23.93 – 10.0.23.94	10.0.23.95
217	10.0.23.96/30	10.0.23.97 – 10.0.23.98	10.0.23.99
218	10.0.23.100/30	10.0.23.101 – 10.0.23.102	10.0.23.103
219	10.0.23.104/30	10.0.23.105 – 10.0.23.106	10.0.23.107
220	10.0.23.108/30	10.0.23.109 – 10.0.23.110	10.0.23.111
221	10.0.23.112/30	10.0.23.113 – 10.0.23.114	10.0.23.115
222	10.0.23.116/30	10.0.23.117 – 10.0.23.118	10.0.23.119
223	10.0.23.120/30	10.0.23.121 – 10.0.23.122	10.0.23.123
224	10.0.23.124/30	10.0.23.125 – 10.0.23.126	10.0.23.127
225	10.0.23.128/30	10.0.23.129 – 10.0.23.130	10.0.23.131
226	10.0.23.132/30	10.0.23.133 – 10.0.23.134	10.0.23.135
227	10.0.23.136/30	10.0.23.137 – 10.0.23.138	10.0.23.139
228	10.0.23.140/30	10.0.23.141 – 10.0.23.142	10.0.23.143
229	10.0.23.144/30	10.0.23.145 – 10.0.23.146	10.0.23.147
230	10.0.23.148/30	10.0.23.149 – 10.0.23.150	10.0.23.151
231	10.0.23.152/30	10.0.23.153 – 10.0.23.154	10.0.23.155
232	10.0.23.156/30	10.0.23.157 – 10.0.23.158	10.0.23.159
233	10.0.23.160/30	10.0.23.161 – 10.0.23.162	10.0.23.163
234	10.0.23.164/30	10.0.23.165 – 10.0.23.166	10.0.23.167
235	10.0.23.168/30	10.0.23.169 – 10.0.23.170	10.0.23.171
236	10.0.23.172/30	10.0.23.173 – 10.0.23.174	10.0.23.175
237	10.0.23.176/30	10.0.23.177 – 10.0.23.178	10.0.23.179
238	10.0.23.180/30	10.0.23.181 – 10.0.23.182	10.0.23.183
239	10.0.23.184/30	10.0.23.185 – 10.0.23.186	10.0.23.187
240	10.0.23.188/30	10.0.23.189 – 10.0.23.190	10.0.23.191
241	10.0.23.192/30	10.0.23.193 – 10.0.23.194	10.0.23.195
242	10.0.23.196/30	10.0.23.197 – 10.0.23.198	10.0.23.199
243	10.0.23.200/30	10.0.23.201 – 10.0.23.202	10.0.23.203
244	10.0.23.204/30	10.0.23.205 – 10.0.23.206	10.0.23.207
245	10.0.23.208/30	10.0.23.209 – 10.0.23.210	10.0.23.211
246	10.0.23.212/30	10.0.23.213 – 10.0.23.214	10.0.23.215
247	10.0.23.216/30	10.0.23.217 – 10.0.23.218	10.0.23.219
248	10.0.23.220/30	10.0.23.221 – 10.0.23.222	10.0.23.223
249	10.0.23.224/30	10.0.23.225 – 10.0.23.226	10.0.23.227
250	10.0.23.228/30	10.0.23.229 – 10.0.23.230	10.0.23.231
251	10.0.23.232/30	10.0.23.233 – 10.0.23.234	10.0.23.235
252	10.0.23.236/30	10.0.23.237 – 10.0.23.238	10.0.23.239
253	10.0.23.240/30	10.0.23.241 – 10.0.23.242	10.0.23.243
254	10.0.23.244/30	10.0.23.245 – 10.0.23.246	10.0.23.247
255	10.0.23.248/30	10.0.23.249 – 10.0.23.250	10.0.23.251
256	10.0.23.252/30	10.0.23.253 – 10.0.23.254	10.0.23.255

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 →