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)10.0.12.0/22

network10.0.12.0/22

broadcast10.0.15.255

first host10.0.12.1

last host10.0.15.254

subnet mask255.255.252.0

wildcard0.0.3.255

addresses1,024

usable hosts1,022

classA

ipcalc 10.0.12.0/22

address00001010.00000000.00001100.00000000

subnet mask11111111.11111111.11111100.00000000

network00001010.00000000.00001100.00000000

broadcast00001010.00000000.00001111.11111111

green = network part, grey = host part

hex0x0a000c00

decimal167775232

reverse dns0.12.0.10.in-addr.arpa

ipv4-mapped::ffff:a00:c00

/22 split into /30 · 256 subnets

close ×

#	network	host range	broadcast
1	10.0.12.0/30	10.0.12.1 – 10.0.12.2	10.0.12.3
2	10.0.12.4/30	10.0.12.5 – 10.0.12.6	10.0.12.7
3	10.0.12.8/30	10.0.12.9 – 10.0.12.10	10.0.12.11
4	10.0.12.12/30	10.0.12.13 – 10.0.12.14	10.0.12.15
5	10.0.12.16/30	10.0.12.17 – 10.0.12.18	10.0.12.19
6	10.0.12.20/30	10.0.12.21 – 10.0.12.22	10.0.12.23
7	10.0.12.24/30	10.0.12.25 – 10.0.12.26	10.0.12.27
8	10.0.12.28/30	10.0.12.29 – 10.0.12.30	10.0.12.31
9	10.0.12.32/30	10.0.12.33 – 10.0.12.34	10.0.12.35
10	10.0.12.36/30	10.0.12.37 – 10.0.12.38	10.0.12.39
11	10.0.12.40/30	10.0.12.41 – 10.0.12.42	10.0.12.43
12	10.0.12.44/30	10.0.12.45 – 10.0.12.46	10.0.12.47
13	10.0.12.48/30	10.0.12.49 – 10.0.12.50	10.0.12.51
14	10.0.12.52/30	10.0.12.53 – 10.0.12.54	10.0.12.55
15	10.0.12.56/30	10.0.12.57 – 10.0.12.58	10.0.12.59
16	10.0.12.60/30	10.0.12.61 – 10.0.12.62	10.0.12.63
17	10.0.12.64/30	10.0.12.65 – 10.0.12.66	10.0.12.67
18	10.0.12.68/30	10.0.12.69 – 10.0.12.70	10.0.12.71
19	10.0.12.72/30	10.0.12.73 – 10.0.12.74	10.0.12.75
20	10.0.12.76/30	10.0.12.77 – 10.0.12.78	10.0.12.79
21	10.0.12.80/30	10.0.12.81 – 10.0.12.82	10.0.12.83
22	10.0.12.84/30	10.0.12.85 – 10.0.12.86	10.0.12.87
23	10.0.12.88/30	10.0.12.89 – 10.0.12.90	10.0.12.91
24	10.0.12.92/30	10.0.12.93 – 10.0.12.94	10.0.12.95
25	10.0.12.96/30	10.0.12.97 – 10.0.12.98	10.0.12.99
26	10.0.12.100/30	10.0.12.101 – 10.0.12.102	10.0.12.103
27	10.0.12.104/30	10.0.12.105 – 10.0.12.106	10.0.12.107
28	10.0.12.108/30	10.0.12.109 – 10.0.12.110	10.0.12.111
29	10.0.12.112/30	10.0.12.113 – 10.0.12.114	10.0.12.115
30	10.0.12.116/30	10.0.12.117 – 10.0.12.118	10.0.12.119
31	10.0.12.120/30	10.0.12.121 – 10.0.12.122	10.0.12.123
32	10.0.12.124/30	10.0.12.125 – 10.0.12.126	10.0.12.127
33	10.0.12.128/30	10.0.12.129 – 10.0.12.130	10.0.12.131
34	10.0.12.132/30	10.0.12.133 – 10.0.12.134	10.0.12.135
35	10.0.12.136/30	10.0.12.137 – 10.0.12.138	10.0.12.139
36	10.0.12.140/30	10.0.12.141 – 10.0.12.142	10.0.12.143
37	10.0.12.144/30	10.0.12.145 – 10.0.12.146	10.0.12.147
38	10.0.12.148/30	10.0.12.149 – 10.0.12.150	10.0.12.151
39	10.0.12.152/30	10.0.12.153 – 10.0.12.154	10.0.12.155
40	10.0.12.156/30	10.0.12.157 – 10.0.12.158	10.0.12.159
41	10.0.12.160/30	10.0.12.161 – 10.0.12.162	10.0.12.163
42	10.0.12.164/30	10.0.12.165 – 10.0.12.166	10.0.12.167
43	10.0.12.168/30	10.0.12.169 – 10.0.12.170	10.0.12.171
44	10.0.12.172/30	10.0.12.173 – 10.0.12.174	10.0.12.175
45	10.0.12.176/30	10.0.12.177 – 10.0.12.178	10.0.12.179
46	10.0.12.180/30	10.0.12.181 – 10.0.12.182	10.0.12.183
47	10.0.12.184/30	10.0.12.185 – 10.0.12.186	10.0.12.187
48	10.0.12.188/30	10.0.12.189 – 10.0.12.190	10.0.12.191
49	10.0.12.192/30	10.0.12.193 – 10.0.12.194	10.0.12.195
50	10.0.12.196/30	10.0.12.197 – 10.0.12.198	10.0.12.199
51	10.0.12.200/30	10.0.12.201 – 10.0.12.202	10.0.12.203
52	10.0.12.204/30	10.0.12.205 – 10.0.12.206	10.0.12.207
53	10.0.12.208/30	10.0.12.209 – 10.0.12.210	10.0.12.211
54	10.0.12.212/30	10.0.12.213 – 10.0.12.214	10.0.12.215
55	10.0.12.216/30	10.0.12.217 – 10.0.12.218	10.0.12.219
56	10.0.12.220/30	10.0.12.221 – 10.0.12.222	10.0.12.223
57	10.0.12.224/30	10.0.12.225 – 10.0.12.226	10.0.12.227
58	10.0.12.228/30	10.0.12.229 – 10.0.12.230	10.0.12.231
59	10.0.12.232/30	10.0.12.233 – 10.0.12.234	10.0.12.235
60	10.0.12.236/30	10.0.12.237 – 10.0.12.238	10.0.12.239
61	10.0.12.240/30	10.0.12.241 – 10.0.12.242	10.0.12.243
62	10.0.12.244/30	10.0.12.245 – 10.0.12.246	10.0.12.247
63	10.0.12.248/30	10.0.12.249 – 10.0.12.250	10.0.12.251
64	10.0.12.252/30	10.0.12.253 – 10.0.12.254	10.0.12.255
65	10.0.13.0/30	10.0.13.1 – 10.0.13.2	10.0.13.3
66	10.0.13.4/30	10.0.13.5 – 10.0.13.6	10.0.13.7
67	10.0.13.8/30	10.0.13.9 – 10.0.13.10	10.0.13.11
68	10.0.13.12/30	10.0.13.13 – 10.0.13.14	10.0.13.15
69	10.0.13.16/30	10.0.13.17 – 10.0.13.18	10.0.13.19
70	10.0.13.20/30	10.0.13.21 – 10.0.13.22	10.0.13.23
71	10.0.13.24/30	10.0.13.25 – 10.0.13.26	10.0.13.27
72	10.0.13.28/30	10.0.13.29 – 10.0.13.30	10.0.13.31
73	10.0.13.32/30	10.0.13.33 – 10.0.13.34	10.0.13.35
74	10.0.13.36/30	10.0.13.37 – 10.0.13.38	10.0.13.39
75	10.0.13.40/30	10.0.13.41 – 10.0.13.42	10.0.13.43
76	10.0.13.44/30	10.0.13.45 – 10.0.13.46	10.0.13.47
77	10.0.13.48/30	10.0.13.49 – 10.0.13.50	10.0.13.51
78	10.0.13.52/30	10.0.13.53 – 10.0.13.54	10.0.13.55
79	10.0.13.56/30	10.0.13.57 – 10.0.13.58	10.0.13.59
80	10.0.13.60/30	10.0.13.61 – 10.0.13.62	10.0.13.63
81	10.0.13.64/30	10.0.13.65 – 10.0.13.66	10.0.13.67
82	10.0.13.68/30	10.0.13.69 – 10.0.13.70	10.0.13.71
83	10.0.13.72/30	10.0.13.73 – 10.0.13.74	10.0.13.75
84	10.0.13.76/30	10.0.13.77 – 10.0.13.78	10.0.13.79
85	10.0.13.80/30	10.0.13.81 – 10.0.13.82	10.0.13.83
86	10.0.13.84/30	10.0.13.85 – 10.0.13.86	10.0.13.87
87	10.0.13.88/30	10.0.13.89 – 10.0.13.90	10.0.13.91
88	10.0.13.92/30	10.0.13.93 – 10.0.13.94	10.0.13.95
89	10.0.13.96/30	10.0.13.97 – 10.0.13.98	10.0.13.99
90	10.0.13.100/30	10.0.13.101 – 10.0.13.102	10.0.13.103
91	10.0.13.104/30	10.0.13.105 – 10.0.13.106	10.0.13.107
92	10.0.13.108/30	10.0.13.109 – 10.0.13.110	10.0.13.111
93	10.0.13.112/30	10.0.13.113 – 10.0.13.114	10.0.13.115
94	10.0.13.116/30	10.0.13.117 – 10.0.13.118	10.0.13.119
95	10.0.13.120/30	10.0.13.121 – 10.0.13.122	10.0.13.123
96	10.0.13.124/30	10.0.13.125 – 10.0.13.126	10.0.13.127
97	10.0.13.128/30	10.0.13.129 – 10.0.13.130	10.0.13.131
98	10.0.13.132/30	10.0.13.133 – 10.0.13.134	10.0.13.135
99	10.0.13.136/30	10.0.13.137 – 10.0.13.138	10.0.13.139
100	10.0.13.140/30	10.0.13.141 – 10.0.13.142	10.0.13.143
101	10.0.13.144/30	10.0.13.145 – 10.0.13.146	10.0.13.147
102	10.0.13.148/30	10.0.13.149 – 10.0.13.150	10.0.13.151
103	10.0.13.152/30	10.0.13.153 – 10.0.13.154	10.0.13.155
104	10.0.13.156/30	10.0.13.157 – 10.0.13.158	10.0.13.159
105	10.0.13.160/30	10.0.13.161 – 10.0.13.162	10.0.13.163
106	10.0.13.164/30	10.0.13.165 – 10.0.13.166	10.0.13.167
107	10.0.13.168/30	10.0.13.169 – 10.0.13.170	10.0.13.171
108	10.0.13.172/30	10.0.13.173 – 10.0.13.174	10.0.13.175
109	10.0.13.176/30	10.0.13.177 – 10.0.13.178	10.0.13.179
110	10.0.13.180/30	10.0.13.181 – 10.0.13.182	10.0.13.183
111	10.0.13.184/30	10.0.13.185 – 10.0.13.186	10.0.13.187
112	10.0.13.188/30	10.0.13.189 – 10.0.13.190	10.0.13.191
113	10.0.13.192/30	10.0.13.193 – 10.0.13.194	10.0.13.195
114	10.0.13.196/30	10.0.13.197 – 10.0.13.198	10.0.13.199
115	10.0.13.200/30	10.0.13.201 – 10.0.13.202	10.0.13.203
116	10.0.13.204/30	10.0.13.205 – 10.0.13.206	10.0.13.207
117	10.0.13.208/30	10.0.13.209 – 10.0.13.210	10.0.13.211
118	10.0.13.212/30	10.0.13.213 – 10.0.13.214	10.0.13.215
119	10.0.13.216/30	10.0.13.217 – 10.0.13.218	10.0.13.219
120	10.0.13.220/30	10.0.13.221 – 10.0.13.222	10.0.13.223
121	10.0.13.224/30	10.0.13.225 – 10.0.13.226	10.0.13.227
122	10.0.13.228/30	10.0.13.229 – 10.0.13.230	10.0.13.231
123	10.0.13.232/30	10.0.13.233 – 10.0.13.234	10.0.13.235
124	10.0.13.236/30	10.0.13.237 – 10.0.13.238	10.0.13.239
125	10.0.13.240/30	10.0.13.241 – 10.0.13.242	10.0.13.243
126	10.0.13.244/30	10.0.13.245 – 10.0.13.246	10.0.13.247
127	10.0.13.248/30	10.0.13.249 – 10.0.13.250	10.0.13.251
128	10.0.13.252/30	10.0.13.253 – 10.0.13.254	10.0.13.255
129	10.0.14.0/30	10.0.14.1 – 10.0.14.2	10.0.14.3
130	10.0.14.4/30	10.0.14.5 – 10.0.14.6	10.0.14.7
131	10.0.14.8/30	10.0.14.9 – 10.0.14.10	10.0.14.11
132	10.0.14.12/30	10.0.14.13 – 10.0.14.14	10.0.14.15
133	10.0.14.16/30	10.0.14.17 – 10.0.14.18	10.0.14.19
134	10.0.14.20/30	10.0.14.21 – 10.0.14.22	10.0.14.23
135	10.0.14.24/30	10.0.14.25 – 10.0.14.26	10.0.14.27
136	10.0.14.28/30	10.0.14.29 – 10.0.14.30	10.0.14.31
137	10.0.14.32/30	10.0.14.33 – 10.0.14.34	10.0.14.35
138	10.0.14.36/30	10.0.14.37 – 10.0.14.38	10.0.14.39
139	10.0.14.40/30	10.0.14.41 – 10.0.14.42	10.0.14.43
140	10.0.14.44/30	10.0.14.45 – 10.0.14.46	10.0.14.47
141	10.0.14.48/30	10.0.14.49 – 10.0.14.50	10.0.14.51
142	10.0.14.52/30	10.0.14.53 – 10.0.14.54	10.0.14.55
143	10.0.14.56/30	10.0.14.57 – 10.0.14.58	10.0.14.59
144	10.0.14.60/30	10.0.14.61 – 10.0.14.62	10.0.14.63
145	10.0.14.64/30	10.0.14.65 – 10.0.14.66	10.0.14.67
146	10.0.14.68/30	10.0.14.69 – 10.0.14.70	10.0.14.71
147	10.0.14.72/30	10.0.14.73 – 10.0.14.74	10.0.14.75
148	10.0.14.76/30	10.0.14.77 – 10.0.14.78	10.0.14.79
149	10.0.14.80/30	10.0.14.81 – 10.0.14.82	10.0.14.83
150	10.0.14.84/30	10.0.14.85 – 10.0.14.86	10.0.14.87
151	10.0.14.88/30	10.0.14.89 – 10.0.14.90	10.0.14.91
152	10.0.14.92/30	10.0.14.93 – 10.0.14.94	10.0.14.95
153	10.0.14.96/30	10.0.14.97 – 10.0.14.98	10.0.14.99
154	10.0.14.100/30	10.0.14.101 – 10.0.14.102	10.0.14.103
155	10.0.14.104/30	10.0.14.105 – 10.0.14.106	10.0.14.107
156	10.0.14.108/30	10.0.14.109 – 10.0.14.110	10.0.14.111
157	10.0.14.112/30	10.0.14.113 – 10.0.14.114	10.0.14.115
158	10.0.14.116/30	10.0.14.117 – 10.0.14.118	10.0.14.119
159	10.0.14.120/30	10.0.14.121 – 10.0.14.122	10.0.14.123
160	10.0.14.124/30	10.0.14.125 – 10.0.14.126	10.0.14.127
161	10.0.14.128/30	10.0.14.129 – 10.0.14.130	10.0.14.131
162	10.0.14.132/30	10.0.14.133 – 10.0.14.134	10.0.14.135
163	10.0.14.136/30	10.0.14.137 – 10.0.14.138	10.0.14.139
164	10.0.14.140/30	10.0.14.141 – 10.0.14.142	10.0.14.143
165	10.0.14.144/30	10.0.14.145 – 10.0.14.146	10.0.14.147
166	10.0.14.148/30	10.0.14.149 – 10.0.14.150	10.0.14.151
167	10.0.14.152/30	10.0.14.153 – 10.0.14.154	10.0.14.155
168	10.0.14.156/30	10.0.14.157 – 10.0.14.158	10.0.14.159
169	10.0.14.160/30	10.0.14.161 – 10.0.14.162	10.0.14.163
170	10.0.14.164/30	10.0.14.165 – 10.0.14.166	10.0.14.167
171	10.0.14.168/30	10.0.14.169 – 10.0.14.170	10.0.14.171
172	10.0.14.172/30	10.0.14.173 – 10.0.14.174	10.0.14.175
173	10.0.14.176/30	10.0.14.177 – 10.0.14.178	10.0.14.179
174	10.0.14.180/30	10.0.14.181 – 10.0.14.182	10.0.14.183
175	10.0.14.184/30	10.0.14.185 – 10.0.14.186	10.0.14.187
176	10.0.14.188/30	10.0.14.189 – 10.0.14.190	10.0.14.191
177	10.0.14.192/30	10.0.14.193 – 10.0.14.194	10.0.14.195
178	10.0.14.196/30	10.0.14.197 – 10.0.14.198	10.0.14.199
179	10.0.14.200/30	10.0.14.201 – 10.0.14.202	10.0.14.203
180	10.0.14.204/30	10.0.14.205 – 10.0.14.206	10.0.14.207
181	10.0.14.208/30	10.0.14.209 – 10.0.14.210	10.0.14.211
182	10.0.14.212/30	10.0.14.213 – 10.0.14.214	10.0.14.215
183	10.0.14.216/30	10.0.14.217 – 10.0.14.218	10.0.14.219
184	10.0.14.220/30	10.0.14.221 – 10.0.14.222	10.0.14.223
185	10.0.14.224/30	10.0.14.225 – 10.0.14.226	10.0.14.227
186	10.0.14.228/30	10.0.14.229 – 10.0.14.230	10.0.14.231
187	10.0.14.232/30	10.0.14.233 – 10.0.14.234	10.0.14.235
188	10.0.14.236/30	10.0.14.237 – 10.0.14.238	10.0.14.239
189	10.0.14.240/30	10.0.14.241 – 10.0.14.242	10.0.14.243
190	10.0.14.244/30	10.0.14.245 – 10.0.14.246	10.0.14.247
191	10.0.14.248/30	10.0.14.249 – 10.0.14.250	10.0.14.251
192	10.0.14.252/30	10.0.14.253 – 10.0.14.254	10.0.14.255
193	10.0.15.0/30	10.0.15.1 – 10.0.15.2	10.0.15.3
194	10.0.15.4/30	10.0.15.5 – 10.0.15.6	10.0.15.7
195	10.0.15.8/30	10.0.15.9 – 10.0.15.10	10.0.15.11
196	10.0.15.12/30	10.0.15.13 – 10.0.15.14	10.0.15.15
197	10.0.15.16/30	10.0.15.17 – 10.0.15.18	10.0.15.19
198	10.0.15.20/30	10.0.15.21 – 10.0.15.22	10.0.15.23
199	10.0.15.24/30	10.0.15.25 – 10.0.15.26	10.0.15.27
200	10.0.15.28/30	10.0.15.29 – 10.0.15.30	10.0.15.31
201	10.0.15.32/30	10.0.15.33 – 10.0.15.34	10.0.15.35
202	10.0.15.36/30	10.0.15.37 – 10.0.15.38	10.0.15.39
203	10.0.15.40/30	10.0.15.41 – 10.0.15.42	10.0.15.43
204	10.0.15.44/30	10.0.15.45 – 10.0.15.46	10.0.15.47
205	10.0.15.48/30	10.0.15.49 – 10.0.15.50	10.0.15.51
206	10.0.15.52/30	10.0.15.53 – 10.0.15.54	10.0.15.55
207	10.0.15.56/30	10.0.15.57 – 10.0.15.58	10.0.15.59
208	10.0.15.60/30	10.0.15.61 – 10.0.15.62	10.0.15.63
209	10.0.15.64/30	10.0.15.65 – 10.0.15.66	10.0.15.67
210	10.0.15.68/30	10.0.15.69 – 10.0.15.70	10.0.15.71
211	10.0.15.72/30	10.0.15.73 – 10.0.15.74	10.0.15.75
212	10.0.15.76/30	10.0.15.77 – 10.0.15.78	10.0.15.79
213	10.0.15.80/30	10.0.15.81 – 10.0.15.82	10.0.15.83
214	10.0.15.84/30	10.0.15.85 – 10.0.15.86	10.0.15.87
215	10.0.15.88/30	10.0.15.89 – 10.0.15.90	10.0.15.91
216	10.0.15.92/30	10.0.15.93 – 10.0.15.94	10.0.15.95
217	10.0.15.96/30	10.0.15.97 – 10.0.15.98	10.0.15.99
218	10.0.15.100/30	10.0.15.101 – 10.0.15.102	10.0.15.103
219	10.0.15.104/30	10.0.15.105 – 10.0.15.106	10.0.15.107
220	10.0.15.108/30	10.0.15.109 – 10.0.15.110	10.0.15.111
221	10.0.15.112/30	10.0.15.113 – 10.0.15.114	10.0.15.115
222	10.0.15.116/30	10.0.15.117 – 10.0.15.118	10.0.15.119
223	10.0.15.120/30	10.0.15.121 – 10.0.15.122	10.0.15.123
224	10.0.15.124/30	10.0.15.125 – 10.0.15.126	10.0.15.127
225	10.0.15.128/30	10.0.15.129 – 10.0.15.130	10.0.15.131
226	10.0.15.132/30	10.0.15.133 – 10.0.15.134	10.0.15.135
227	10.0.15.136/30	10.0.15.137 – 10.0.15.138	10.0.15.139
228	10.0.15.140/30	10.0.15.141 – 10.0.15.142	10.0.15.143
229	10.0.15.144/30	10.0.15.145 – 10.0.15.146	10.0.15.147
230	10.0.15.148/30	10.0.15.149 – 10.0.15.150	10.0.15.151
231	10.0.15.152/30	10.0.15.153 – 10.0.15.154	10.0.15.155
232	10.0.15.156/30	10.0.15.157 – 10.0.15.158	10.0.15.159
233	10.0.15.160/30	10.0.15.161 – 10.0.15.162	10.0.15.163
234	10.0.15.164/30	10.0.15.165 – 10.0.15.166	10.0.15.167
235	10.0.15.168/30	10.0.15.169 – 10.0.15.170	10.0.15.171
236	10.0.15.172/30	10.0.15.173 – 10.0.15.174	10.0.15.175
237	10.0.15.176/30	10.0.15.177 – 10.0.15.178	10.0.15.179
238	10.0.15.180/30	10.0.15.181 – 10.0.15.182	10.0.15.183
239	10.0.15.184/30	10.0.15.185 – 10.0.15.186	10.0.15.187
240	10.0.15.188/30	10.0.15.189 – 10.0.15.190	10.0.15.191
241	10.0.15.192/30	10.0.15.193 – 10.0.15.194	10.0.15.195
242	10.0.15.196/30	10.0.15.197 – 10.0.15.198	10.0.15.199
243	10.0.15.200/30	10.0.15.201 – 10.0.15.202	10.0.15.203
244	10.0.15.204/30	10.0.15.205 – 10.0.15.206	10.0.15.207
245	10.0.15.208/30	10.0.15.209 – 10.0.15.210	10.0.15.211
246	10.0.15.212/30	10.0.15.213 – 10.0.15.214	10.0.15.215
247	10.0.15.216/30	10.0.15.217 – 10.0.15.218	10.0.15.219
248	10.0.15.220/30	10.0.15.221 – 10.0.15.222	10.0.15.223
249	10.0.15.224/30	10.0.15.225 – 10.0.15.226	10.0.15.227
250	10.0.15.228/30	10.0.15.229 – 10.0.15.230	10.0.15.231
251	10.0.15.232/30	10.0.15.233 – 10.0.15.234	10.0.15.235
252	10.0.15.236/30	10.0.15.237 – 10.0.15.238	10.0.15.239
253	10.0.15.240/30	10.0.15.241 – 10.0.15.242	10.0.15.243
254	10.0.15.244/30	10.0.15.245 – 10.0.15.246	10.0.15.247
255	10.0.15.248/30	10.0.15.249 – 10.0.15.250	10.0.15.251
256	10.0.15.252/30	10.0.15.253 – 10.0.15.254	10.0.15.255

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 →