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)172.16.0.0/22

network172.16.0.0/22

broadcast172.16.3.255

first host172.16.0.1

last host172.16.3.254

subnet mask255.255.252.0

wildcard0.0.3.255

addresses1,024

usable hosts1,022

classB

ipcalc 172.16.0.0/22

address10101100.00010000.00000000.00000000

subnet mask11111111.11111111.11111100.00000000

network10101100.00010000.00000000.00000000

broadcast10101100.00010000.00000011.11111111

green = network part, grey = host part

hex0xac100000

decimal2886729728

reverse dns0.0.16.172.in-addr.arpa

ipv4-mapped::ffff:ac10:0

/22 split into /30 · 256 subnets

close ×

#	network	host range	broadcast
1	172.16.0.0/30	172.16.0.1 – 172.16.0.2	172.16.0.3
2	172.16.0.4/30	172.16.0.5 – 172.16.0.6	172.16.0.7
3	172.16.0.8/30	172.16.0.9 – 172.16.0.10	172.16.0.11
4	172.16.0.12/30	172.16.0.13 – 172.16.0.14	172.16.0.15
5	172.16.0.16/30	172.16.0.17 – 172.16.0.18	172.16.0.19
6	172.16.0.20/30	172.16.0.21 – 172.16.0.22	172.16.0.23
7	172.16.0.24/30	172.16.0.25 – 172.16.0.26	172.16.0.27
8	172.16.0.28/30	172.16.0.29 – 172.16.0.30	172.16.0.31
9	172.16.0.32/30	172.16.0.33 – 172.16.0.34	172.16.0.35
10	172.16.0.36/30	172.16.0.37 – 172.16.0.38	172.16.0.39
11	172.16.0.40/30	172.16.0.41 – 172.16.0.42	172.16.0.43
12	172.16.0.44/30	172.16.0.45 – 172.16.0.46	172.16.0.47
13	172.16.0.48/30	172.16.0.49 – 172.16.0.50	172.16.0.51
14	172.16.0.52/30	172.16.0.53 – 172.16.0.54	172.16.0.55
15	172.16.0.56/30	172.16.0.57 – 172.16.0.58	172.16.0.59
16	172.16.0.60/30	172.16.0.61 – 172.16.0.62	172.16.0.63
17	172.16.0.64/30	172.16.0.65 – 172.16.0.66	172.16.0.67
18	172.16.0.68/30	172.16.0.69 – 172.16.0.70	172.16.0.71
19	172.16.0.72/30	172.16.0.73 – 172.16.0.74	172.16.0.75
20	172.16.0.76/30	172.16.0.77 – 172.16.0.78	172.16.0.79
21	172.16.0.80/30	172.16.0.81 – 172.16.0.82	172.16.0.83
22	172.16.0.84/30	172.16.0.85 – 172.16.0.86	172.16.0.87
23	172.16.0.88/30	172.16.0.89 – 172.16.0.90	172.16.0.91
24	172.16.0.92/30	172.16.0.93 – 172.16.0.94	172.16.0.95
25	172.16.0.96/30	172.16.0.97 – 172.16.0.98	172.16.0.99
26	172.16.0.100/30	172.16.0.101 – 172.16.0.102	172.16.0.103
27	172.16.0.104/30	172.16.0.105 – 172.16.0.106	172.16.0.107
28	172.16.0.108/30	172.16.0.109 – 172.16.0.110	172.16.0.111
29	172.16.0.112/30	172.16.0.113 – 172.16.0.114	172.16.0.115
30	172.16.0.116/30	172.16.0.117 – 172.16.0.118	172.16.0.119
31	172.16.0.120/30	172.16.0.121 – 172.16.0.122	172.16.0.123
32	172.16.0.124/30	172.16.0.125 – 172.16.0.126	172.16.0.127
33	172.16.0.128/30	172.16.0.129 – 172.16.0.130	172.16.0.131
34	172.16.0.132/30	172.16.0.133 – 172.16.0.134	172.16.0.135
35	172.16.0.136/30	172.16.0.137 – 172.16.0.138	172.16.0.139
36	172.16.0.140/30	172.16.0.141 – 172.16.0.142	172.16.0.143
37	172.16.0.144/30	172.16.0.145 – 172.16.0.146	172.16.0.147
38	172.16.0.148/30	172.16.0.149 – 172.16.0.150	172.16.0.151
39	172.16.0.152/30	172.16.0.153 – 172.16.0.154	172.16.0.155
40	172.16.0.156/30	172.16.0.157 – 172.16.0.158	172.16.0.159
41	172.16.0.160/30	172.16.0.161 – 172.16.0.162	172.16.0.163
42	172.16.0.164/30	172.16.0.165 – 172.16.0.166	172.16.0.167
43	172.16.0.168/30	172.16.0.169 – 172.16.0.170	172.16.0.171
44	172.16.0.172/30	172.16.0.173 – 172.16.0.174	172.16.0.175
45	172.16.0.176/30	172.16.0.177 – 172.16.0.178	172.16.0.179
46	172.16.0.180/30	172.16.0.181 – 172.16.0.182	172.16.0.183
47	172.16.0.184/30	172.16.0.185 – 172.16.0.186	172.16.0.187
48	172.16.0.188/30	172.16.0.189 – 172.16.0.190	172.16.0.191
49	172.16.0.192/30	172.16.0.193 – 172.16.0.194	172.16.0.195
50	172.16.0.196/30	172.16.0.197 – 172.16.0.198	172.16.0.199
51	172.16.0.200/30	172.16.0.201 – 172.16.0.202	172.16.0.203
52	172.16.0.204/30	172.16.0.205 – 172.16.0.206	172.16.0.207
53	172.16.0.208/30	172.16.0.209 – 172.16.0.210	172.16.0.211
54	172.16.0.212/30	172.16.0.213 – 172.16.0.214	172.16.0.215
55	172.16.0.216/30	172.16.0.217 – 172.16.0.218	172.16.0.219
56	172.16.0.220/30	172.16.0.221 – 172.16.0.222	172.16.0.223
57	172.16.0.224/30	172.16.0.225 – 172.16.0.226	172.16.0.227
58	172.16.0.228/30	172.16.0.229 – 172.16.0.230	172.16.0.231
59	172.16.0.232/30	172.16.0.233 – 172.16.0.234	172.16.0.235
60	172.16.0.236/30	172.16.0.237 – 172.16.0.238	172.16.0.239
61	172.16.0.240/30	172.16.0.241 – 172.16.0.242	172.16.0.243
62	172.16.0.244/30	172.16.0.245 – 172.16.0.246	172.16.0.247
63	172.16.0.248/30	172.16.0.249 – 172.16.0.250	172.16.0.251
64	172.16.0.252/30	172.16.0.253 – 172.16.0.254	172.16.0.255
65	172.16.1.0/30	172.16.1.1 – 172.16.1.2	172.16.1.3
66	172.16.1.4/30	172.16.1.5 – 172.16.1.6	172.16.1.7
67	172.16.1.8/30	172.16.1.9 – 172.16.1.10	172.16.1.11
68	172.16.1.12/30	172.16.1.13 – 172.16.1.14	172.16.1.15
69	172.16.1.16/30	172.16.1.17 – 172.16.1.18	172.16.1.19
70	172.16.1.20/30	172.16.1.21 – 172.16.1.22	172.16.1.23
71	172.16.1.24/30	172.16.1.25 – 172.16.1.26	172.16.1.27
72	172.16.1.28/30	172.16.1.29 – 172.16.1.30	172.16.1.31
73	172.16.1.32/30	172.16.1.33 – 172.16.1.34	172.16.1.35
74	172.16.1.36/30	172.16.1.37 – 172.16.1.38	172.16.1.39
75	172.16.1.40/30	172.16.1.41 – 172.16.1.42	172.16.1.43
76	172.16.1.44/30	172.16.1.45 – 172.16.1.46	172.16.1.47
77	172.16.1.48/30	172.16.1.49 – 172.16.1.50	172.16.1.51
78	172.16.1.52/30	172.16.1.53 – 172.16.1.54	172.16.1.55
79	172.16.1.56/30	172.16.1.57 – 172.16.1.58	172.16.1.59
80	172.16.1.60/30	172.16.1.61 – 172.16.1.62	172.16.1.63
81	172.16.1.64/30	172.16.1.65 – 172.16.1.66	172.16.1.67
82	172.16.1.68/30	172.16.1.69 – 172.16.1.70	172.16.1.71
83	172.16.1.72/30	172.16.1.73 – 172.16.1.74	172.16.1.75
84	172.16.1.76/30	172.16.1.77 – 172.16.1.78	172.16.1.79
85	172.16.1.80/30	172.16.1.81 – 172.16.1.82	172.16.1.83
86	172.16.1.84/30	172.16.1.85 – 172.16.1.86	172.16.1.87
87	172.16.1.88/30	172.16.1.89 – 172.16.1.90	172.16.1.91
88	172.16.1.92/30	172.16.1.93 – 172.16.1.94	172.16.1.95
89	172.16.1.96/30	172.16.1.97 – 172.16.1.98	172.16.1.99
90	172.16.1.100/30	172.16.1.101 – 172.16.1.102	172.16.1.103
91	172.16.1.104/30	172.16.1.105 – 172.16.1.106	172.16.1.107
92	172.16.1.108/30	172.16.1.109 – 172.16.1.110	172.16.1.111
93	172.16.1.112/30	172.16.1.113 – 172.16.1.114	172.16.1.115
94	172.16.1.116/30	172.16.1.117 – 172.16.1.118	172.16.1.119
95	172.16.1.120/30	172.16.1.121 – 172.16.1.122	172.16.1.123
96	172.16.1.124/30	172.16.1.125 – 172.16.1.126	172.16.1.127
97	172.16.1.128/30	172.16.1.129 – 172.16.1.130	172.16.1.131
98	172.16.1.132/30	172.16.1.133 – 172.16.1.134	172.16.1.135
99	172.16.1.136/30	172.16.1.137 – 172.16.1.138	172.16.1.139
100	172.16.1.140/30	172.16.1.141 – 172.16.1.142	172.16.1.143
101	172.16.1.144/30	172.16.1.145 – 172.16.1.146	172.16.1.147
102	172.16.1.148/30	172.16.1.149 – 172.16.1.150	172.16.1.151
103	172.16.1.152/30	172.16.1.153 – 172.16.1.154	172.16.1.155
104	172.16.1.156/30	172.16.1.157 – 172.16.1.158	172.16.1.159
105	172.16.1.160/30	172.16.1.161 – 172.16.1.162	172.16.1.163
106	172.16.1.164/30	172.16.1.165 – 172.16.1.166	172.16.1.167
107	172.16.1.168/30	172.16.1.169 – 172.16.1.170	172.16.1.171
108	172.16.1.172/30	172.16.1.173 – 172.16.1.174	172.16.1.175
109	172.16.1.176/30	172.16.1.177 – 172.16.1.178	172.16.1.179
110	172.16.1.180/30	172.16.1.181 – 172.16.1.182	172.16.1.183
111	172.16.1.184/30	172.16.1.185 – 172.16.1.186	172.16.1.187
112	172.16.1.188/30	172.16.1.189 – 172.16.1.190	172.16.1.191
113	172.16.1.192/30	172.16.1.193 – 172.16.1.194	172.16.1.195
114	172.16.1.196/30	172.16.1.197 – 172.16.1.198	172.16.1.199
115	172.16.1.200/30	172.16.1.201 – 172.16.1.202	172.16.1.203
116	172.16.1.204/30	172.16.1.205 – 172.16.1.206	172.16.1.207
117	172.16.1.208/30	172.16.1.209 – 172.16.1.210	172.16.1.211
118	172.16.1.212/30	172.16.1.213 – 172.16.1.214	172.16.1.215
119	172.16.1.216/30	172.16.1.217 – 172.16.1.218	172.16.1.219
120	172.16.1.220/30	172.16.1.221 – 172.16.1.222	172.16.1.223
121	172.16.1.224/30	172.16.1.225 – 172.16.1.226	172.16.1.227
122	172.16.1.228/30	172.16.1.229 – 172.16.1.230	172.16.1.231
123	172.16.1.232/30	172.16.1.233 – 172.16.1.234	172.16.1.235
124	172.16.1.236/30	172.16.1.237 – 172.16.1.238	172.16.1.239
125	172.16.1.240/30	172.16.1.241 – 172.16.1.242	172.16.1.243
126	172.16.1.244/30	172.16.1.245 – 172.16.1.246	172.16.1.247
127	172.16.1.248/30	172.16.1.249 – 172.16.1.250	172.16.1.251
128	172.16.1.252/30	172.16.1.253 – 172.16.1.254	172.16.1.255
129	172.16.2.0/30	172.16.2.1 – 172.16.2.2	172.16.2.3
130	172.16.2.4/30	172.16.2.5 – 172.16.2.6	172.16.2.7
131	172.16.2.8/30	172.16.2.9 – 172.16.2.10	172.16.2.11
132	172.16.2.12/30	172.16.2.13 – 172.16.2.14	172.16.2.15
133	172.16.2.16/30	172.16.2.17 – 172.16.2.18	172.16.2.19
134	172.16.2.20/30	172.16.2.21 – 172.16.2.22	172.16.2.23
135	172.16.2.24/30	172.16.2.25 – 172.16.2.26	172.16.2.27
136	172.16.2.28/30	172.16.2.29 – 172.16.2.30	172.16.2.31
137	172.16.2.32/30	172.16.2.33 – 172.16.2.34	172.16.2.35
138	172.16.2.36/30	172.16.2.37 – 172.16.2.38	172.16.2.39
139	172.16.2.40/30	172.16.2.41 – 172.16.2.42	172.16.2.43
140	172.16.2.44/30	172.16.2.45 – 172.16.2.46	172.16.2.47
141	172.16.2.48/30	172.16.2.49 – 172.16.2.50	172.16.2.51
142	172.16.2.52/30	172.16.2.53 – 172.16.2.54	172.16.2.55
143	172.16.2.56/30	172.16.2.57 – 172.16.2.58	172.16.2.59
144	172.16.2.60/30	172.16.2.61 – 172.16.2.62	172.16.2.63
145	172.16.2.64/30	172.16.2.65 – 172.16.2.66	172.16.2.67
146	172.16.2.68/30	172.16.2.69 – 172.16.2.70	172.16.2.71
147	172.16.2.72/30	172.16.2.73 – 172.16.2.74	172.16.2.75
148	172.16.2.76/30	172.16.2.77 – 172.16.2.78	172.16.2.79
149	172.16.2.80/30	172.16.2.81 – 172.16.2.82	172.16.2.83
150	172.16.2.84/30	172.16.2.85 – 172.16.2.86	172.16.2.87
151	172.16.2.88/30	172.16.2.89 – 172.16.2.90	172.16.2.91
152	172.16.2.92/30	172.16.2.93 – 172.16.2.94	172.16.2.95
153	172.16.2.96/30	172.16.2.97 – 172.16.2.98	172.16.2.99
154	172.16.2.100/30	172.16.2.101 – 172.16.2.102	172.16.2.103
155	172.16.2.104/30	172.16.2.105 – 172.16.2.106	172.16.2.107
156	172.16.2.108/30	172.16.2.109 – 172.16.2.110	172.16.2.111
157	172.16.2.112/30	172.16.2.113 – 172.16.2.114	172.16.2.115
158	172.16.2.116/30	172.16.2.117 – 172.16.2.118	172.16.2.119
159	172.16.2.120/30	172.16.2.121 – 172.16.2.122	172.16.2.123
160	172.16.2.124/30	172.16.2.125 – 172.16.2.126	172.16.2.127
161	172.16.2.128/30	172.16.2.129 – 172.16.2.130	172.16.2.131
162	172.16.2.132/30	172.16.2.133 – 172.16.2.134	172.16.2.135
163	172.16.2.136/30	172.16.2.137 – 172.16.2.138	172.16.2.139
164	172.16.2.140/30	172.16.2.141 – 172.16.2.142	172.16.2.143
165	172.16.2.144/30	172.16.2.145 – 172.16.2.146	172.16.2.147
166	172.16.2.148/30	172.16.2.149 – 172.16.2.150	172.16.2.151
167	172.16.2.152/30	172.16.2.153 – 172.16.2.154	172.16.2.155
168	172.16.2.156/30	172.16.2.157 – 172.16.2.158	172.16.2.159
169	172.16.2.160/30	172.16.2.161 – 172.16.2.162	172.16.2.163
170	172.16.2.164/30	172.16.2.165 – 172.16.2.166	172.16.2.167
171	172.16.2.168/30	172.16.2.169 – 172.16.2.170	172.16.2.171
172	172.16.2.172/30	172.16.2.173 – 172.16.2.174	172.16.2.175
173	172.16.2.176/30	172.16.2.177 – 172.16.2.178	172.16.2.179
174	172.16.2.180/30	172.16.2.181 – 172.16.2.182	172.16.2.183
175	172.16.2.184/30	172.16.2.185 – 172.16.2.186	172.16.2.187
176	172.16.2.188/30	172.16.2.189 – 172.16.2.190	172.16.2.191
177	172.16.2.192/30	172.16.2.193 – 172.16.2.194	172.16.2.195
178	172.16.2.196/30	172.16.2.197 – 172.16.2.198	172.16.2.199
179	172.16.2.200/30	172.16.2.201 – 172.16.2.202	172.16.2.203
180	172.16.2.204/30	172.16.2.205 – 172.16.2.206	172.16.2.207
181	172.16.2.208/30	172.16.2.209 – 172.16.2.210	172.16.2.211
182	172.16.2.212/30	172.16.2.213 – 172.16.2.214	172.16.2.215
183	172.16.2.216/30	172.16.2.217 – 172.16.2.218	172.16.2.219
184	172.16.2.220/30	172.16.2.221 – 172.16.2.222	172.16.2.223
185	172.16.2.224/30	172.16.2.225 – 172.16.2.226	172.16.2.227
186	172.16.2.228/30	172.16.2.229 – 172.16.2.230	172.16.2.231
187	172.16.2.232/30	172.16.2.233 – 172.16.2.234	172.16.2.235
188	172.16.2.236/30	172.16.2.237 – 172.16.2.238	172.16.2.239
189	172.16.2.240/30	172.16.2.241 – 172.16.2.242	172.16.2.243
190	172.16.2.244/30	172.16.2.245 – 172.16.2.246	172.16.2.247
191	172.16.2.248/30	172.16.2.249 – 172.16.2.250	172.16.2.251
192	172.16.2.252/30	172.16.2.253 – 172.16.2.254	172.16.2.255
193	172.16.3.0/30	172.16.3.1 – 172.16.3.2	172.16.3.3
194	172.16.3.4/30	172.16.3.5 – 172.16.3.6	172.16.3.7
195	172.16.3.8/30	172.16.3.9 – 172.16.3.10	172.16.3.11
196	172.16.3.12/30	172.16.3.13 – 172.16.3.14	172.16.3.15
197	172.16.3.16/30	172.16.3.17 – 172.16.3.18	172.16.3.19
198	172.16.3.20/30	172.16.3.21 – 172.16.3.22	172.16.3.23
199	172.16.3.24/30	172.16.3.25 – 172.16.3.26	172.16.3.27
200	172.16.3.28/30	172.16.3.29 – 172.16.3.30	172.16.3.31
201	172.16.3.32/30	172.16.3.33 – 172.16.3.34	172.16.3.35
202	172.16.3.36/30	172.16.3.37 – 172.16.3.38	172.16.3.39
203	172.16.3.40/30	172.16.3.41 – 172.16.3.42	172.16.3.43
204	172.16.3.44/30	172.16.3.45 – 172.16.3.46	172.16.3.47
205	172.16.3.48/30	172.16.3.49 – 172.16.3.50	172.16.3.51
206	172.16.3.52/30	172.16.3.53 – 172.16.3.54	172.16.3.55
207	172.16.3.56/30	172.16.3.57 – 172.16.3.58	172.16.3.59
208	172.16.3.60/30	172.16.3.61 – 172.16.3.62	172.16.3.63
209	172.16.3.64/30	172.16.3.65 – 172.16.3.66	172.16.3.67
210	172.16.3.68/30	172.16.3.69 – 172.16.3.70	172.16.3.71
211	172.16.3.72/30	172.16.3.73 – 172.16.3.74	172.16.3.75
212	172.16.3.76/30	172.16.3.77 – 172.16.3.78	172.16.3.79
213	172.16.3.80/30	172.16.3.81 – 172.16.3.82	172.16.3.83
214	172.16.3.84/30	172.16.3.85 – 172.16.3.86	172.16.3.87
215	172.16.3.88/30	172.16.3.89 – 172.16.3.90	172.16.3.91
216	172.16.3.92/30	172.16.3.93 – 172.16.3.94	172.16.3.95
217	172.16.3.96/30	172.16.3.97 – 172.16.3.98	172.16.3.99
218	172.16.3.100/30	172.16.3.101 – 172.16.3.102	172.16.3.103
219	172.16.3.104/30	172.16.3.105 – 172.16.3.106	172.16.3.107
220	172.16.3.108/30	172.16.3.109 – 172.16.3.110	172.16.3.111
221	172.16.3.112/30	172.16.3.113 – 172.16.3.114	172.16.3.115
222	172.16.3.116/30	172.16.3.117 – 172.16.3.118	172.16.3.119
223	172.16.3.120/30	172.16.3.121 – 172.16.3.122	172.16.3.123
224	172.16.3.124/30	172.16.3.125 – 172.16.3.126	172.16.3.127
225	172.16.3.128/30	172.16.3.129 – 172.16.3.130	172.16.3.131
226	172.16.3.132/30	172.16.3.133 – 172.16.3.134	172.16.3.135
227	172.16.3.136/30	172.16.3.137 – 172.16.3.138	172.16.3.139
228	172.16.3.140/30	172.16.3.141 – 172.16.3.142	172.16.3.143
229	172.16.3.144/30	172.16.3.145 – 172.16.3.146	172.16.3.147
230	172.16.3.148/30	172.16.3.149 – 172.16.3.150	172.16.3.151
231	172.16.3.152/30	172.16.3.153 – 172.16.3.154	172.16.3.155
232	172.16.3.156/30	172.16.3.157 – 172.16.3.158	172.16.3.159
233	172.16.3.160/30	172.16.3.161 – 172.16.3.162	172.16.3.163
234	172.16.3.164/30	172.16.3.165 – 172.16.3.166	172.16.3.167
235	172.16.3.168/30	172.16.3.169 – 172.16.3.170	172.16.3.171
236	172.16.3.172/30	172.16.3.173 – 172.16.3.174	172.16.3.175
237	172.16.3.176/30	172.16.3.177 – 172.16.3.178	172.16.3.179
238	172.16.3.180/30	172.16.3.181 – 172.16.3.182	172.16.3.183
239	172.16.3.184/30	172.16.3.185 – 172.16.3.186	172.16.3.187
240	172.16.3.188/30	172.16.3.189 – 172.16.3.190	172.16.3.191
241	172.16.3.192/30	172.16.3.193 – 172.16.3.194	172.16.3.195
242	172.16.3.196/30	172.16.3.197 – 172.16.3.198	172.16.3.199
243	172.16.3.200/30	172.16.3.201 – 172.16.3.202	172.16.3.203
244	172.16.3.204/30	172.16.3.205 – 172.16.3.206	172.16.3.207
245	172.16.3.208/30	172.16.3.209 – 172.16.3.210	172.16.3.211
246	172.16.3.212/30	172.16.3.213 – 172.16.3.214	172.16.3.215
247	172.16.3.216/30	172.16.3.217 – 172.16.3.218	172.16.3.219
248	172.16.3.220/30	172.16.3.221 – 172.16.3.222	172.16.3.223
249	172.16.3.224/30	172.16.3.225 – 172.16.3.226	172.16.3.227
250	172.16.3.228/30	172.16.3.229 – 172.16.3.230	172.16.3.231
251	172.16.3.232/30	172.16.3.233 – 172.16.3.234	172.16.3.235
252	172.16.3.236/30	172.16.3.237 – 172.16.3.238	172.16.3.239
253	172.16.3.240/30	172.16.3.241 – 172.16.3.242	172.16.3.243
254	172.16.3.244/30	172.16.3.245 – 172.16.3.246	172.16.3.247
255	172.16.3.248/30	172.16.3.249 – 172.16.3.250	172.16.3.251
256	172.16.3.252/30	172.16.3.253 – 172.16.3.254	172.16.3.255

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 →