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)10.2.20.0/22

network10.2.20.0/22

broadcast10.2.23.255

first host10.2.20.1

last host10.2.23.254

subnet mask255.255.252.0

wildcard0.0.3.255

addresses1,024

usable hosts1,022

classA

ipcalc 10.2.20.0/22

address00001010.00000010.00010100.00000000

subnet mask11111111.11111111.11111100.00000000

network00001010.00000010.00010100.00000000

broadcast00001010.00000010.00010111.11111111

green = network part, grey = host part

hex0x0a021400

decimal167908352

reverse dns0.20.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:1400

/22 split into /30 · 256 subnets

close ×

#	network	host range	broadcast
1	10.2.20.0/30	10.2.20.1 – 10.2.20.2	10.2.20.3
2	10.2.20.4/30	10.2.20.5 – 10.2.20.6	10.2.20.7
3	10.2.20.8/30	10.2.20.9 – 10.2.20.10	10.2.20.11
4	10.2.20.12/30	10.2.20.13 – 10.2.20.14	10.2.20.15
5	10.2.20.16/30	10.2.20.17 – 10.2.20.18	10.2.20.19
6	10.2.20.20/30	10.2.20.21 – 10.2.20.22	10.2.20.23
7	10.2.20.24/30	10.2.20.25 – 10.2.20.26	10.2.20.27
8	10.2.20.28/30	10.2.20.29 – 10.2.20.30	10.2.20.31
9	10.2.20.32/30	10.2.20.33 – 10.2.20.34	10.2.20.35
10	10.2.20.36/30	10.2.20.37 – 10.2.20.38	10.2.20.39
11	10.2.20.40/30	10.2.20.41 – 10.2.20.42	10.2.20.43
12	10.2.20.44/30	10.2.20.45 – 10.2.20.46	10.2.20.47
13	10.2.20.48/30	10.2.20.49 – 10.2.20.50	10.2.20.51
14	10.2.20.52/30	10.2.20.53 – 10.2.20.54	10.2.20.55
15	10.2.20.56/30	10.2.20.57 – 10.2.20.58	10.2.20.59
16	10.2.20.60/30	10.2.20.61 – 10.2.20.62	10.2.20.63
17	10.2.20.64/30	10.2.20.65 – 10.2.20.66	10.2.20.67
18	10.2.20.68/30	10.2.20.69 – 10.2.20.70	10.2.20.71
19	10.2.20.72/30	10.2.20.73 – 10.2.20.74	10.2.20.75
20	10.2.20.76/30	10.2.20.77 – 10.2.20.78	10.2.20.79
21	10.2.20.80/30	10.2.20.81 – 10.2.20.82	10.2.20.83
22	10.2.20.84/30	10.2.20.85 – 10.2.20.86	10.2.20.87
23	10.2.20.88/30	10.2.20.89 – 10.2.20.90	10.2.20.91
24	10.2.20.92/30	10.2.20.93 – 10.2.20.94	10.2.20.95
25	10.2.20.96/30	10.2.20.97 – 10.2.20.98	10.2.20.99
26	10.2.20.100/30	10.2.20.101 – 10.2.20.102	10.2.20.103
27	10.2.20.104/30	10.2.20.105 – 10.2.20.106	10.2.20.107
28	10.2.20.108/30	10.2.20.109 – 10.2.20.110	10.2.20.111
29	10.2.20.112/30	10.2.20.113 – 10.2.20.114	10.2.20.115
30	10.2.20.116/30	10.2.20.117 – 10.2.20.118	10.2.20.119
31	10.2.20.120/30	10.2.20.121 – 10.2.20.122	10.2.20.123
32	10.2.20.124/30	10.2.20.125 – 10.2.20.126	10.2.20.127
33	10.2.20.128/30	10.2.20.129 – 10.2.20.130	10.2.20.131
34	10.2.20.132/30	10.2.20.133 – 10.2.20.134	10.2.20.135
35	10.2.20.136/30	10.2.20.137 – 10.2.20.138	10.2.20.139
36	10.2.20.140/30	10.2.20.141 – 10.2.20.142	10.2.20.143
37	10.2.20.144/30	10.2.20.145 – 10.2.20.146	10.2.20.147
38	10.2.20.148/30	10.2.20.149 – 10.2.20.150	10.2.20.151
39	10.2.20.152/30	10.2.20.153 – 10.2.20.154	10.2.20.155
40	10.2.20.156/30	10.2.20.157 – 10.2.20.158	10.2.20.159
41	10.2.20.160/30	10.2.20.161 – 10.2.20.162	10.2.20.163
42	10.2.20.164/30	10.2.20.165 – 10.2.20.166	10.2.20.167
43	10.2.20.168/30	10.2.20.169 – 10.2.20.170	10.2.20.171
44	10.2.20.172/30	10.2.20.173 – 10.2.20.174	10.2.20.175
45	10.2.20.176/30	10.2.20.177 – 10.2.20.178	10.2.20.179
46	10.2.20.180/30	10.2.20.181 – 10.2.20.182	10.2.20.183
47	10.2.20.184/30	10.2.20.185 – 10.2.20.186	10.2.20.187
48	10.2.20.188/30	10.2.20.189 – 10.2.20.190	10.2.20.191
49	10.2.20.192/30	10.2.20.193 – 10.2.20.194	10.2.20.195
50	10.2.20.196/30	10.2.20.197 – 10.2.20.198	10.2.20.199
51	10.2.20.200/30	10.2.20.201 – 10.2.20.202	10.2.20.203
52	10.2.20.204/30	10.2.20.205 – 10.2.20.206	10.2.20.207
53	10.2.20.208/30	10.2.20.209 – 10.2.20.210	10.2.20.211
54	10.2.20.212/30	10.2.20.213 – 10.2.20.214	10.2.20.215
55	10.2.20.216/30	10.2.20.217 – 10.2.20.218	10.2.20.219
56	10.2.20.220/30	10.2.20.221 – 10.2.20.222	10.2.20.223
57	10.2.20.224/30	10.2.20.225 – 10.2.20.226	10.2.20.227
58	10.2.20.228/30	10.2.20.229 – 10.2.20.230	10.2.20.231
59	10.2.20.232/30	10.2.20.233 – 10.2.20.234	10.2.20.235
60	10.2.20.236/30	10.2.20.237 – 10.2.20.238	10.2.20.239
61	10.2.20.240/30	10.2.20.241 – 10.2.20.242	10.2.20.243
62	10.2.20.244/30	10.2.20.245 – 10.2.20.246	10.2.20.247
63	10.2.20.248/30	10.2.20.249 – 10.2.20.250	10.2.20.251
64	10.2.20.252/30	10.2.20.253 – 10.2.20.254	10.2.20.255
65	10.2.21.0/30	10.2.21.1 – 10.2.21.2	10.2.21.3
66	10.2.21.4/30	10.2.21.5 – 10.2.21.6	10.2.21.7
67	10.2.21.8/30	10.2.21.9 – 10.2.21.10	10.2.21.11
68	10.2.21.12/30	10.2.21.13 – 10.2.21.14	10.2.21.15
69	10.2.21.16/30	10.2.21.17 – 10.2.21.18	10.2.21.19
70	10.2.21.20/30	10.2.21.21 – 10.2.21.22	10.2.21.23
71	10.2.21.24/30	10.2.21.25 – 10.2.21.26	10.2.21.27
72	10.2.21.28/30	10.2.21.29 – 10.2.21.30	10.2.21.31
73	10.2.21.32/30	10.2.21.33 – 10.2.21.34	10.2.21.35
74	10.2.21.36/30	10.2.21.37 – 10.2.21.38	10.2.21.39
75	10.2.21.40/30	10.2.21.41 – 10.2.21.42	10.2.21.43
76	10.2.21.44/30	10.2.21.45 – 10.2.21.46	10.2.21.47
77	10.2.21.48/30	10.2.21.49 – 10.2.21.50	10.2.21.51
78	10.2.21.52/30	10.2.21.53 – 10.2.21.54	10.2.21.55
79	10.2.21.56/30	10.2.21.57 – 10.2.21.58	10.2.21.59
80	10.2.21.60/30	10.2.21.61 – 10.2.21.62	10.2.21.63
81	10.2.21.64/30	10.2.21.65 – 10.2.21.66	10.2.21.67
82	10.2.21.68/30	10.2.21.69 – 10.2.21.70	10.2.21.71
83	10.2.21.72/30	10.2.21.73 – 10.2.21.74	10.2.21.75
84	10.2.21.76/30	10.2.21.77 – 10.2.21.78	10.2.21.79
85	10.2.21.80/30	10.2.21.81 – 10.2.21.82	10.2.21.83
86	10.2.21.84/30	10.2.21.85 – 10.2.21.86	10.2.21.87
87	10.2.21.88/30	10.2.21.89 – 10.2.21.90	10.2.21.91
88	10.2.21.92/30	10.2.21.93 – 10.2.21.94	10.2.21.95
89	10.2.21.96/30	10.2.21.97 – 10.2.21.98	10.2.21.99
90	10.2.21.100/30	10.2.21.101 – 10.2.21.102	10.2.21.103
91	10.2.21.104/30	10.2.21.105 – 10.2.21.106	10.2.21.107
92	10.2.21.108/30	10.2.21.109 – 10.2.21.110	10.2.21.111
93	10.2.21.112/30	10.2.21.113 – 10.2.21.114	10.2.21.115
94	10.2.21.116/30	10.2.21.117 – 10.2.21.118	10.2.21.119
95	10.2.21.120/30	10.2.21.121 – 10.2.21.122	10.2.21.123
96	10.2.21.124/30	10.2.21.125 – 10.2.21.126	10.2.21.127
97	10.2.21.128/30	10.2.21.129 – 10.2.21.130	10.2.21.131
98	10.2.21.132/30	10.2.21.133 – 10.2.21.134	10.2.21.135
99	10.2.21.136/30	10.2.21.137 – 10.2.21.138	10.2.21.139
100	10.2.21.140/30	10.2.21.141 – 10.2.21.142	10.2.21.143
101	10.2.21.144/30	10.2.21.145 – 10.2.21.146	10.2.21.147
102	10.2.21.148/30	10.2.21.149 – 10.2.21.150	10.2.21.151
103	10.2.21.152/30	10.2.21.153 – 10.2.21.154	10.2.21.155
104	10.2.21.156/30	10.2.21.157 – 10.2.21.158	10.2.21.159
105	10.2.21.160/30	10.2.21.161 – 10.2.21.162	10.2.21.163
106	10.2.21.164/30	10.2.21.165 – 10.2.21.166	10.2.21.167
107	10.2.21.168/30	10.2.21.169 – 10.2.21.170	10.2.21.171
108	10.2.21.172/30	10.2.21.173 – 10.2.21.174	10.2.21.175
109	10.2.21.176/30	10.2.21.177 – 10.2.21.178	10.2.21.179
110	10.2.21.180/30	10.2.21.181 – 10.2.21.182	10.2.21.183
111	10.2.21.184/30	10.2.21.185 – 10.2.21.186	10.2.21.187
112	10.2.21.188/30	10.2.21.189 – 10.2.21.190	10.2.21.191
113	10.2.21.192/30	10.2.21.193 – 10.2.21.194	10.2.21.195
114	10.2.21.196/30	10.2.21.197 – 10.2.21.198	10.2.21.199
115	10.2.21.200/30	10.2.21.201 – 10.2.21.202	10.2.21.203
116	10.2.21.204/30	10.2.21.205 – 10.2.21.206	10.2.21.207
117	10.2.21.208/30	10.2.21.209 – 10.2.21.210	10.2.21.211
118	10.2.21.212/30	10.2.21.213 – 10.2.21.214	10.2.21.215
119	10.2.21.216/30	10.2.21.217 – 10.2.21.218	10.2.21.219
120	10.2.21.220/30	10.2.21.221 – 10.2.21.222	10.2.21.223
121	10.2.21.224/30	10.2.21.225 – 10.2.21.226	10.2.21.227
122	10.2.21.228/30	10.2.21.229 – 10.2.21.230	10.2.21.231
123	10.2.21.232/30	10.2.21.233 – 10.2.21.234	10.2.21.235
124	10.2.21.236/30	10.2.21.237 – 10.2.21.238	10.2.21.239
125	10.2.21.240/30	10.2.21.241 – 10.2.21.242	10.2.21.243
126	10.2.21.244/30	10.2.21.245 – 10.2.21.246	10.2.21.247
127	10.2.21.248/30	10.2.21.249 – 10.2.21.250	10.2.21.251
128	10.2.21.252/30	10.2.21.253 – 10.2.21.254	10.2.21.255
129	10.2.22.0/30	10.2.22.1 – 10.2.22.2	10.2.22.3
130	10.2.22.4/30	10.2.22.5 – 10.2.22.6	10.2.22.7
131	10.2.22.8/30	10.2.22.9 – 10.2.22.10	10.2.22.11
132	10.2.22.12/30	10.2.22.13 – 10.2.22.14	10.2.22.15
133	10.2.22.16/30	10.2.22.17 – 10.2.22.18	10.2.22.19
134	10.2.22.20/30	10.2.22.21 – 10.2.22.22	10.2.22.23
135	10.2.22.24/30	10.2.22.25 – 10.2.22.26	10.2.22.27
136	10.2.22.28/30	10.2.22.29 – 10.2.22.30	10.2.22.31
137	10.2.22.32/30	10.2.22.33 – 10.2.22.34	10.2.22.35
138	10.2.22.36/30	10.2.22.37 – 10.2.22.38	10.2.22.39
139	10.2.22.40/30	10.2.22.41 – 10.2.22.42	10.2.22.43
140	10.2.22.44/30	10.2.22.45 – 10.2.22.46	10.2.22.47
141	10.2.22.48/30	10.2.22.49 – 10.2.22.50	10.2.22.51
142	10.2.22.52/30	10.2.22.53 – 10.2.22.54	10.2.22.55
143	10.2.22.56/30	10.2.22.57 – 10.2.22.58	10.2.22.59
144	10.2.22.60/30	10.2.22.61 – 10.2.22.62	10.2.22.63
145	10.2.22.64/30	10.2.22.65 – 10.2.22.66	10.2.22.67
146	10.2.22.68/30	10.2.22.69 – 10.2.22.70	10.2.22.71
147	10.2.22.72/30	10.2.22.73 – 10.2.22.74	10.2.22.75
148	10.2.22.76/30	10.2.22.77 – 10.2.22.78	10.2.22.79
149	10.2.22.80/30	10.2.22.81 – 10.2.22.82	10.2.22.83
150	10.2.22.84/30	10.2.22.85 – 10.2.22.86	10.2.22.87
151	10.2.22.88/30	10.2.22.89 – 10.2.22.90	10.2.22.91
152	10.2.22.92/30	10.2.22.93 – 10.2.22.94	10.2.22.95
153	10.2.22.96/30	10.2.22.97 – 10.2.22.98	10.2.22.99
154	10.2.22.100/30	10.2.22.101 – 10.2.22.102	10.2.22.103
155	10.2.22.104/30	10.2.22.105 – 10.2.22.106	10.2.22.107
156	10.2.22.108/30	10.2.22.109 – 10.2.22.110	10.2.22.111
157	10.2.22.112/30	10.2.22.113 – 10.2.22.114	10.2.22.115
158	10.2.22.116/30	10.2.22.117 – 10.2.22.118	10.2.22.119
159	10.2.22.120/30	10.2.22.121 – 10.2.22.122	10.2.22.123
160	10.2.22.124/30	10.2.22.125 – 10.2.22.126	10.2.22.127
161	10.2.22.128/30	10.2.22.129 – 10.2.22.130	10.2.22.131
162	10.2.22.132/30	10.2.22.133 – 10.2.22.134	10.2.22.135
163	10.2.22.136/30	10.2.22.137 – 10.2.22.138	10.2.22.139
164	10.2.22.140/30	10.2.22.141 – 10.2.22.142	10.2.22.143
165	10.2.22.144/30	10.2.22.145 – 10.2.22.146	10.2.22.147
166	10.2.22.148/30	10.2.22.149 – 10.2.22.150	10.2.22.151
167	10.2.22.152/30	10.2.22.153 – 10.2.22.154	10.2.22.155
168	10.2.22.156/30	10.2.22.157 – 10.2.22.158	10.2.22.159
169	10.2.22.160/30	10.2.22.161 – 10.2.22.162	10.2.22.163
170	10.2.22.164/30	10.2.22.165 – 10.2.22.166	10.2.22.167
171	10.2.22.168/30	10.2.22.169 – 10.2.22.170	10.2.22.171
172	10.2.22.172/30	10.2.22.173 – 10.2.22.174	10.2.22.175
173	10.2.22.176/30	10.2.22.177 – 10.2.22.178	10.2.22.179
174	10.2.22.180/30	10.2.22.181 – 10.2.22.182	10.2.22.183
175	10.2.22.184/30	10.2.22.185 – 10.2.22.186	10.2.22.187
176	10.2.22.188/30	10.2.22.189 – 10.2.22.190	10.2.22.191
177	10.2.22.192/30	10.2.22.193 – 10.2.22.194	10.2.22.195
178	10.2.22.196/30	10.2.22.197 – 10.2.22.198	10.2.22.199
179	10.2.22.200/30	10.2.22.201 – 10.2.22.202	10.2.22.203
180	10.2.22.204/30	10.2.22.205 – 10.2.22.206	10.2.22.207
181	10.2.22.208/30	10.2.22.209 – 10.2.22.210	10.2.22.211
182	10.2.22.212/30	10.2.22.213 – 10.2.22.214	10.2.22.215
183	10.2.22.216/30	10.2.22.217 – 10.2.22.218	10.2.22.219
184	10.2.22.220/30	10.2.22.221 – 10.2.22.222	10.2.22.223
185	10.2.22.224/30	10.2.22.225 – 10.2.22.226	10.2.22.227
186	10.2.22.228/30	10.2.22.229 – 10.2.22.230	10.2.22.231
187	10.2.22.232/30	10.2.22.233 – 10.2.22.234	10.2.22.235
188	10.2.22.236/30	10.2.22.237 – 10.2.22.238	10.2.22.239
189	10.2.22.240/30	10.2.22.241 – 10.2.22.242	10.2.22.243
190	10.2.22.244/30	10.2.22.245 – 10.2.22.246	10.2.22.247
191	10.2.22.248/30	10.2.22.249 – 10.2.22.250	10.2.22.251
192	10.2.22.252/30	10.2.22.253 – 10.2.22.254	10.2.22.255
193	10.2.23.0/30	10.2.23.1 – 10.2.23.2	10.2.23.3
194	10.2.23.4/30	10.2.23.5 – 10.2.23.6	10.2.23.7
195	10.2.23.8/30	10.2.23.9 – 10.2.23.10	10.2.23.11
196	10.2.23.12/30	10.2.23.13 – 10.2.23.14	10.2.23.15
197	10.2.23.16/30	10.2.23.17 – 10.2.23.18	10.2.23.19
198	10.2.23.20/30	10.2.23.21 – 10.2.23.22	10.2.23.23
199	10.2.23.24/30	10.2.23.25 – 10.2.23.26	10.2.23.27
200	10.2.23.28/30	10.2.23.29 – 10.2.23.30	10.2.23.31
201	10.2.23.32/30	10.2.23.33 – 10.2.23.34	10.2.23.35
202	10.2.23.36/30	10.2.23.37 – 10.2.23.38	10.2.23.39
203	10.2.23.40/30	10.2.23.41 – 10.2.23.42	10.2.23.43
204	10.2.23.44/30	10.2.23.45 – 10.2.23.46	10.2.23.47
205	10.2.23.48/30	10.2.23.49 – 10.2.23.50	10.2.23.51
206	10.2.23.52/30	10.2.23.53 – 10.2.23.54	10.2.23.55
207	10.2.23.56/30	10.2.23.57 – 10.2.23.58	10.2.23.59
208	10.2.23.60/30	10.2.23.61 – 10.2.23.62	10.2.23.63
209	10.2.23.64/30	10.2.23.65 – 10.2.23.66	10.2.23.67
210	10.2.23.68/30	10.2.23.69 – 10.2.23.70	10.2.23.71
211	10.2.23.72/30	10.2.23.73 – 10.2.23.74	10.2.23.75
212	10.2.23.76/30	10.2.23.77 – 10.2.23.78	10.2.23.79
213	10.2.23.80/30	10.2.23.81 – 10.2.23.82	10.2.23.83
214	10.2.23.84/30	10.2.23.85 – 10.2.23.86	10.2.23.87
215	10.2.23.88/30	10.2.23.89 – 10.2.23.90	10.2.23.91
216	10.2.23.92/30	10.2.23.93 – 10.2.23.94	10.2.23.95
217	10.2.23.96/30	10.2.23.97 – 10.2.23.98	10.2.23.99
218	10.2.23.100/30	10.2.23.101 – 10.2.23.102	10.2.23.103
219	10.2.23.104/30	10.2.23.105 – 10.2.23.106	10.2.23.107
220	10.2.23.108/30	10.2.23.109 – 10.2.23.110	10.2.23.111
221	10.2.23.112/30	10.2.23.113 – 10.2.23.114	10.2.23.115
222	10.2.23.116/30	10.2.23.117 – 10.2.23.118	10.2.23.119
223	10.2.23.120/30	10.2.23.121 – 10.2.23.122	10.2.23.123
224	10.2.23.124/30	10.2.23.125 – 10.2.23.126	10.2.23.127
225	10.2.23.128/30	10.2.23.129 – 10.2.23.130	10.2.23.131
226	10.2.23.132/30	10.2.23.133 – 10.2.23.134	10.2.23.135
227	10.2.23.136/30	10.2.23.137 – 10.2.23.138	10.2.23.139
228	10.2.23.140/30	10.2.23.141 – 10.2.23.142	10.2.23.143
229	10.2.23.144/30	10.2.23.145 – 10.2.23.146	10.2.23.147
230	10.2.23.148/30	10.2.23.149 – 10.2.23.150	10.2.23.151
231	10.2.23.152/30	10.2.23.153 – 10.2.23.154	10.2.23.155
232	10.2.23.156/30	10.2.23.157 – 10.2.23.158	10.2.23.159
233	10.2.23.160/30	10.2.23.161 – 10.2.23.162	10.2.23.163
234	10.2.23.164/30	10.2.23.165 – 10.2.23.166	10.2.23.167
235	10.2.23.168/30	10.2.23.169 – 10.2.23.170	10.2.23.171
236	10.2.23.172/30	10.2.23.173 – 10.2.23.174	10.2.23.175
237	10.2.23.176/30	10.2.23.177 – 10.2.23.178	10.2.23.179
238	10.2.23.180/30	10.2.23.181 – 10.2.23.182	10.2.23.183
239	10.2.23.184/30	10.2.23.185 – 10.2.23.186	10.2.23.187
240	10.2.23.188/30	10.2.23.189 – 10.2.23.190	10.2.23.191
241	10.2.23.192/30	10.2.23.193 – 10.2.23.194	10.2.23.195
242	10.2.23.196/30	10.2.23.197 – 10.2.23.198	10.2.23.199
243	10.2.23.200/30	10.2.23.201 – 10.2.23.202	10.2.23.203
244	10.2.23.204/30	10.2.23.205 – 10.2.23.206	10.2.23.207
245	10.2.23.208/30	10.2.23.209 – 10.2.23.210	10.2.23.211
246	10.2.23.212/30	10.2.23.213 – 10.2.23.214	10.2.23.215
247	10.2.23.216/30	10.2.23.217 – 10.2.23.218	10.2.23.219
248	10.2.23.220/30	10.2.23.221 – 10.2.23.222	10.2.23.223
249	10.2.23.224/30	10.2.23.225 – 10.2.23.226	10.2.23.227
250	10.2.23.228/30	10.2.23.229 – 10.2.23.230	10.2.23.231
251	10.2.23.232/30	10.2.23.233 – 10.2.23.234	10.2.23.235
252	10.2.23.236/30	10.2.23.237 – 10.2.23.238	10.2.23.239
253	10.2.23.240/30	10.2.23.241 – 10.2.23.242	10.2.23.243
254	10.2.23.244/30	10.2.23.245 – 10.2.23.246	10.2.23.247
255	10.2.23.248/30	10.2.23.249 – 10.2.23.250	10.2.23.251
256	10.2.23.252/30	10.2.23.253 – 10.2.23.254	10.2.23.255

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 →