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)10.3.100.0/22

network10.3.100.0/22

broadcast10.3.103.255

first host10.3.100.1

last host10.3.103.254

subnet mask255.255.252.0

wildcard0.0.3.255

addresses1,024

usable hosts1,022

classA

ipcalc 10.3.100.0/22

address00001010.00000011.01100100.00000000

subnet mask11111111.11111111.11111100.00000000

network00001010.00000011.01100100.00000000

broadcast00001010.00000011.01100111.11111111

green = network part, grey = host part

hex0x0a036400

decimal167994368

reverse dns0.100.3.10.in-addr.arpa

ipv4-mapped::ffff:a03:6400

/22 split into /30 · 256 subnets

close ×

#	network	host range	broadcast
1	10.3.100.0/30	10.3.100.1 – 10.3.100.2	10.3.100.3
2	10.3.100.4/30	10.3.100.5 – 10.3.100.6	10.3.100.7
3	10.3.100.8/30	10.3.100.9 – 10.3.100.10	10.3.100.11
4	10.3.100.12/30	10.3.100.13 – 10.3.100.14	10.3.100.15
5	10.3.100.16/30	10.3.100.17 – 10.3.100.18	10.3.100.19
6	10.3.100.20/30	10.3.100.21 – 10.3.100.22	10.3.100.23
7	10.3.100.24/30	10.3.100.25 – 10.3.100.26	10.3.100.27
8	10.3.100.28/30	10.3.100.29 – 10.3.100.30	10.3.100.31
9	10.3.100.32/30	10.3.100.33 – 10.3.100.34	10.3.100.35
10	10.3.100.36/30	10.3.100.37 – 10.3.100.38	10.3.100.39
11	10.3.100.40/30	10.3.100.41 – 10.3.100.42	10.3.100.43
12	10.3.100.44/30	10.3.100.45 – 10.3.100.46	10.3.100.47
13	10.3.100.48/30	10.3.100.49 – 10.3.100.50	10.3.100.51
14	10.3.100.52/30	10.3.100.53 – 10.3.100.54	10.3.100.55
15	10.3.100.56/30	10.3.100.57 – 10.3.100.58	10.3.100.59
16	10.3.100.60/30	10.3.100.61 – 10.3.100.62	10.3.100.63
17	10.3.100.64/30	10.3.100.65 – 10.3.100.66	10.3.100.67
18	10.3.100.68/30	10.3.100.69 – 10.3.100.70	10.3.100.71
19	10.3.100.72/30	10.3.100.73 – 10.3.100.74	10.3.100.75
20	10.3.100.76/30	10.3.100.77 – 10.3.100.78	10.3.100.79
21	10.3.100.80/30	10.3.100.81 – 10.3.100.82	10.3.100.83
22	10.3.100.84/30	10.3.100.85 – 10.3.100.86	10.3.100.87
23	10.3.100.88/30	10.3.100.89 – 10.3.100.90	10.3.100.91
24	10.3.100.92/30	10.3.100.93 – 10.3.100.94	10.3.100.95
25	10.3.100.96/30	10.3.100.97 – 10.3.100.98	10.3.100.99
26	10.3.100.100/30	10.3.100.101 – 10.3.100.102	10.3.100.103
27	10.3.100.104/30	10.3.100.105 – 10.3.100.106	10.3.100.107
28	10.3.100.108/30	10.3.100.109 – 10.3.100.110	10.3.100.111
29	10.3.100.112/30	10.3.100.113 – 10.3.100.114	10.3.100.115
30	10.3.100.116/30	10.3.100.117 – 10.3.100.118	10.3.100.119
31	10.3.100.120/30	10.3.100.121 – 10.3.100.122	10.3.100.123
32	10.3.100.124/30	10.3.100.125 – 10.3.100.126	10.3.100.127
33	10.3.100.128/30	10.3.100.129 – 10.3.100.130	10.3.100.131
34	10.3.100.132/30	10.3.100.133 – 10.3.100.134	10.3.100.135
35	10.3.100.136/30	10.3.100.137 – 10.3.100.138	10.3.100.139
36	10.3.100.140/30	10.3.100.141 – 10.3.100.142	10.3.100.143
37	10.3.100.144/30	10.3.100.145 – 10.3.100.146	10.3.100.147
38	10.3.100.148/30	10.3.100.149 – 10.3.100.150	10.3.100.151
39	10.3.100.152/30	10.3.100.153 – 10.3.100.154	10.3.100.155
40	10.3.100.156/30	10.3.100.157 – 10.3.100.158	10.3.100.159
41	10.3.100.160/30	10.3.100.161 – 10.3.100.162	10.3.100.163
42	10.3.100.164/30	10.3.100.165 – 10.3.100.166	10.3.100.167
43	10.3.100.168/30	10.3.100.169 – 10.3.100.170	10.3.100.171
44	10.3.100.172/30	10.3.100.173 – 10.3.100.174	10.3.100.175
45	10.3.100.176/30	10.3.100.177 – 10.3.100.178	10.3.100.179
46	10.3.100.180/30	10.3.100.181 – 10.3.100.182	10.3.100.183
47	10.3.100.184/30	10.3.100.185 – 10.3.100.186	10.3.100.187
48	10.3.100.188/30	10.3.100.189 – 10.3.100.190	10.3.100.191
49	10.3.100.192/30	10.3.100.193 – 10.3.100.194	10.3.100.195
50	10.3.100.196/30	10.3.100.197 – 10.3.100.198	10.3.100.199
51	10.3.100.200/30	10.3.100.201 – 10.3.100.202	10.3.100.203
52	10.3.100.204/30	10.3.100.205 – 10.3.100.206	10.3.100.207
53	10.3.100.208/30	10.3.100.209 – 10.3.100.210	10.3.100.211
54	10.3.100.212/30	10.3.100.213 – 10.3.100.214	10.3.100.215
55	10.3.100.216/30	10.3.100.217 – 10.3.100.218	10.3.100.219
56	10.3.100.220/30	10.3.100.221 – 10.3.100.222	10.3.100.223
57	10.3.100.224/30	10.3.100.225 – 10.3.100.226	10.3.100.227
58	10.3.100.228/30	10.3.100.229 – 10.3.100.230	10.3.100.231
59	10.3.100.232/30	10.3.100.233 – 10.3.100.234	10.3.100.235
60	10.3.100.236/30	10.3.100.237 – 10.3.100.238	10.3.100.239
61	10.3.100.240/30	10.3.100.241 – 10.3.100.242	10.3.100.243
62	10.3.100.244/30	10.3.100.245 – 10.3.100.246	10.3.100.247
63	10.3.100.248/30	10.3.100.249 – 10.3.100.250	10.3.100.251
64	10.3.100.252/30	10.3.100.253 – 10.3.100.254	10.3.100.255
65	10.3.101.0/30	10.3.101.1 – 10.3.101.2	10.3.101.3
66	10.3.101.4/30	10.3.101.5 – 10.3.101.6	10.3.101.7
67	10.3.101.8/30	10.3.101.9 – 10.3.101.10	10.3.101.11
68	10.3.101.12/30	10.3.101.13 – 10.3.101.14	10.3.101.15
69	10.3.101.16/30	10.3.101.17 – 10.3.101.18	10.3.101.19
70	10.3.101.20/30	10.3.101.21 – 10.3.101.22	10.3.101.23
71	10.3.101.24/30	10.3.101.25 – 10.3.101.26	10.3.101.27
72	10.3.101.28/30	10.3.101.29 – 10.3.101.30	10.3.101.31
73	10.3.101.32/30	10.3.101.33 – 10.3.101.34	10.3.101.35
74	10.3.101.36/30	10.3.101.37 – 10.3.101.38	10.3.101.39
75	10.3.101.40/30	10.3.101.41 – 10.3.101.42	10.3.101.43
76	10.3.101.44/30	10.3.101.45 – 10.3.101.46	10.3.101.47
77	10.3.101.48/30	10.3.101.49 – 10.3.101.50	10.3.101.51
78	10.3.101.52/30	10.3.101.53 – 10.3.101.54	10.3.101.55
79	10.3.101.56/30	10.3.101.57 – 10.3.101.58	10.3.101.59
80	10.3.101.60/30	10.3.101.61 – 10.3.101.62	10.3.101.63
81	10.3.101.64/30	10.3.101.65 – 10.3.101.66	10.3.101.67
82	10.3.101.68/30	10.3.101.69 – 10.3.101.70	10.3.101.71
83	10.3.101.72/30	10.3.101.73 – 10.3.101.74	10.3.101.75
84	10.3.101.76/30	10.3.101.77 – 10.3.101.78	10.3.101.79
85	10.3.101.80/30	10.3.101.81 – 10.3.101.82	10.3.101.83
86	10.3.101.84/30	10.3.101.85 – 10.3.101.86	10.3.101.87
87	10.3.101.88/30	10.3.101.89 – 10.3.101.90	10.3.101.91
88	10.3.101.92/30	10.3.101.93 – 10.3.101.94	10.3.101.95
89	10.3.101.96/30	10.3.101.97 – 10.3.101.98	10.3.101.99
90	10.3.101.100/30	10.3.101.101 – 10.3.101.102	10.3.101.103
91	10.3.101.104/30	10.3.101.105 – 10.3.101.106	10.3.101.107
92	10.3.101.108/30	10.3.101.109 – 10.3.101.110	10.3.101.111
93	10.3.101.112/30	10.3.101.113 – 10.3.101.114	10.3.101.115
94	10.3.101.116/30	10.3.101.117 – 10.3.101.118	10.3.101.119
95	10.3.101.120/30	10.3.101.121 – 10.3.101.122	10.3.101.123
96	10.3.101.124/30	10.3.101.125 – 10.3.101.126	10.3.101.127
97	10.3.101.128/30	10.3.101.129 – 10.3.101.130	10.3.101.131
98	10.3.101.132/30	10.3.101.133 – 10.3.101.134	10.3.101.135
99	10.3.101.136/30	10.3.101.137 – 10.3.101.138	10.3.101.139
100	10.3.101.140/30	10.3.101.141 – 10.3.101.142	10.3.101.143
101	10.3.101.144/30	10.3.101.145 – 10.3.101.146	10.3.101.147
102	10.3.101.148/30	10.3.101.149 – 10.3.101.150	10.3.101.151
103	10.3.101.152/30	10.3.101.153 – 10.3.101.154	10.3.101.155
104	10.3.101.156/30	10.3.101.157 – 10.3.101.158	10.3.101.159
105	10.3.101.160/30	10.3.101.161 – 10.3.101.162	10.3.101.163
106	10.3.101.164/30	10.3.101.165 – 10.3.101.166	10.3.101.167
107	10.3.101.168/30	10.3.101.169 – 10.3.101.170	10.3.101.171
108	10.3.101.172/30	10.3.101.173 – 10.3.101.174	10.3.101.175
109	10.3.101.176/30	10.3.101.177 – 10.3.101.178	10.3.101.179
110	10.3.101.180/30	10.3.101.181 – 10.3.101.182	10.3.101.183
111	10.3.101.184/30	10.3.101.185 – 10.3.101.186	10.3.101.187
112	10.3.101.188/30	10.3.101.189 – 10.3.101.190	10.3.101.191
113	10.3.101.192/30	10.3.101.193 – 10.3.101.194	10.3.101.195
114	10.3.101.196/30	10.3.101.197 – 10.3.101.198	10.3.101.199
115	10.3.101.200/30	10.3.101.201 – 10.3.101.202	10.3.101.203
116	10.3.101.204/30	10.3.101.205 – 10.3.101.206	10.3.101.207
117	10.3.101.208/30	10.3.101.209 – 10.3.101.210	10.3.101.211
118	10.3.101.212/30	10.3.101.213 – 10.3.101.214	10.3.101.215
119	10.3.101.216/30	10.3.101.217 – 10.3.101.218	10.3.101.219
120	10.3.101.220/30	10.3.101.221 – 10.3.101.222	10.3.101.223
121	10.3.101.224/30	10.3.101.225 – 10.3.101.226	10.3.101.227
122	10.3.101.228/30	10.3.101.229 – 10.3.101.230	10.3.101.231
123	10.3.101.232/30	10.3.101.233 – 10.3.101.234	10.3.101.235
124	10.3.101.236/30	10.3.101.237 – 10.3.101.238	10.3.101.239
125	10.3.101.240/30	10.3.101.241 – 10.3.101.242	10.3.101.243
126	10.3.101.244/30	10.3.101.245 – 10.3.101.246	10.3.101.247
127	10.3.101.248/30	10.3.101.249 – 10.3.101.250	10.3.101.251
128	10.3.101.252/30	10.3.101.253 – 10.3.101.254	10.3.101.255
129	10.3.102.0/30	10.3.102.1 – 10.3.102.2	10.3.102.3
130	10.3.102.4/30	10.3.102.5 – 10.3.102.6	10.3.102.7
131	10.3.102.8/30	10.3.102.9 – 10.3.102.10	10.3.102.11
132	10.3.102.12/30	10.3.102.13 – 10.3.102.14	10.3.102.15
133	10.3.102.16/30	10.3.102.17 – 10.3.102.18	10.3.102.19
134	10.3.102.20/30	10.3.102.21 – 10.3.102.22	10.3.102.23
135	10.3.102.24/30	10.3.102.25 – 10.3.102.26	10.3.102.27
136	10.3.102.28/30	10.3.102.29 – 10.3.102.30	10.3.102.31
137	10.3.102.32/30	10.3.102.33 – 10.3.102.34	10.3.102.35
138	10.3.102.36/30	10.3.102.37 – 10.3.102.38	10.3.102.39
139	10.3.102.40/30	10.3.102.41 – 10.3.102.42	10.3.102.43
140	10.3.102.44/30	10.3.102.45 – 10.3.102.46	10.3.102.47
141	10.3.102.48/30	10.3.102.49 – 10.3.102.50	10.3.102.51
142	10.3.102.52/30	10.3.102.53 – 10.3.102.54	10.3.102.55
143	10.3.102.56/30	10.3.102.57 – 10.3.102.58	10.3.102.59
144	10.3.102.60/30	10.3.102.61 – 10.3.102.62	10.3.102.63
145	10.3.102.64/30	10.3.102.65 – 10.3.102.66	10.3.102.67
146	10.3.102.68/30	10.3.102.69 – 10.3.102.70	10.3.102.71
147	10.3.102.72/30	10.3.102.73 – 10.3.102.74	10.3.102.75
148	10.3.102.76/30	10.3.102.77 – 10.3.102.78	10.3.102.79
149	10.3.102.80/30	10.3.102.81 – 10.3.102.82	10.3.102.83
150	10.3.102.84/30	10.3.102.85 – 10.3.102.86	10.3.102.87
151	10.3.102.88/30	10.3.102.89 – 10.3.102.90	10.3.102.91
152	10.3.102.92/30	10.3.102.93 – 10.3.102.94	10.3.102.95
153	10.3.102.96/30	10.3.102.97 – 10.3.102.98	10.3.102.99
154	10.3.102.100/30	10.3.102.101 – 10.3.102.102	10.3.102.103
155	10.3.102.104/30	10.3.102.105 – 10.3.102.106	10.3.102.107
156	10.3.102.108/30	10.3.102.109 – 10.3.102.110	10.3.102.111
157	10.3.102.112/30	10.3.102.113 – 10.3.102.114	10.3.102.115
158	10.3.102.116/30	10.3.102.117 – 10.3.102.118	10.3.102.119
159	10.3.102.120/30	10.3.102.121 – 10.3.102.122	10.3.102.123
160	10.3.102.124/30	10.3.102.125 – 10.3.102.126	10.3.102.127
161	10.3.102.128/30	10.3.102.129 – 10.3.102.130	10.3.102.131
162	10.3.102.132/30	10.3.102.133 – 10.3.102.134	10.3.102.135
163	10.3.102.136/30	10.3.102.137 – 10.3.102.138	10.3.102.139
164	10.3.102.140/30	10.3.102.141 – 10.3.102.142	10.3.102.143
165	10.3.102.144/30	10.3.102.145 – 10.3.102.146	10.3.102.147
166	10.3.102.148/30	10.3.102.149 – 10.3.102.150	10.3.102.151
167	10.3.102.152/30	10.3.102.153 – 10.3.102.154	10.3.102.155
168	10.3.102.156/30	10.3.102.157 – 10.3.102.158	10.3.102.159
169	10.3.102.160/30	10.3.102.161 – 10.3.102.162	10.3.102.163
170	10.3.102.164/30	10.3.102.165 – 10.3.102.166	10.3.102.167
171	10.3.102.168/30	10.3.102.169 – 10.3.102.170	10.3.102.171
172	10.3.102.172/30	10.3.102.173 – 10.3.102.174	10.3.102.175
173	10.3.102.176/30	10.3.102.177 – 10.3.102.178	10.3.102.179
174	10.3.102.180/30	10.3.102.181 – 10.3.102.182	10.3.102.183
175	10.3.102.184/30	10.3.102.185 – 10.3.102.186	10.3.102.187
176	10.3.102.188/30	10.3.102.189 – 10.3.102.190	10.3.102.191
177	10.3.102.192/30	10.3.102.193 – 10.3.102.194	10.3.102.195
178	10.3.102.196/30	10.3.102.197 – 10.3.102.198	10.3.102.199
179	10.3.102.200/30	10.3.102.201 – 10.3.102.202	10.3.102.203
180	10.3.102.204/30	10.3.102.205 – 10.3.102.206	10.3.102.207
181	10.3.102.208/30	10.3.102.209 – 10.3.102.210	10.3.102.211
182	10.3.102.212/30	10.3.102.213 – 10.3.102.214	10.3.102.215
183	10.3.102.216/30	10.3.102.217 – 10.3.102.218	10.3.102.219
184	10.3.102.220/30	10.3.102.221 – 10.3.102.222	10.3.102.223
185	10.3.102.224/30	10.3.102.225 – 10.3.102.226	10.3.102.227
186	10.3.102.228/30	10.3.102.229 – 10.3.102.230	10.3.102.231
187	10.3.102.232/30	10.3.102.233 – 10.3.102.234	10.3.102.235
188	10.3.102.236/30	10.3.102.237 – 10.3.102.238	10.3.102.239
189	10.3.102.240/30	10.3.102.241 – 10.3.102.242	10.3.102.243
190	10.3.102.244/30	10.3.102.245 – 10.3.102.246	10.3.102.247
191	10.3.102.248/30	10.3.102.249 – 10.3.102.250	10.3.102.251
192	10.3.102.252/30	10.3.102.253 – 10.3.102.254	10.3.102.255
193	10.3.103.0/30	10.3.103.1 – 10.3.103.2	10.3.103.3
194	10.3.103.4/30	10.3.103.5 – 10.3.103.6	10.3.103.7
195	10.3.103.8/30	10.3.103.9 – 10.3.103.10	10.3.103.11
196	10.3.103.12/30	10.3.103.13 – 10.3.103.14	10.3.103.15
197	10.3.103.16/30	10.3.103.17 – 10.3.103.18	10.3.103.19
198	10.3.103.20/30	10.3.103.21 – 10.3.103.22	10.3.103.23
199	10.3.103.24/30	10.3.103.25 – 10.3.103.26	10.3.103.27
200	10.3.103.28/30	10.3.103.29 – 10.3.103.30	10.3.103.31
201	10.3.103.32/30	10.3.103.33 – 10.3.103.34	10.3.103.35
202	10.3.103.36/30	10.3.103.37 – 10.3.103.38	10.3.103.39
203	10.3.103.40/30	10.3.103.41 – 10.3.103.42	10.3.103.43
204	10.3.103.44/30	10.3.103.45 – 10.3.103.46	10.3.103.47
205	10.3.103.48/30	10.3.103.49 – 10.3.103.50	10.3.103.51
206	10.3.103.52/30	10.3.103.53 – 10.3.103.54	10.3.103.55
207	10.3.103.56/30	10.3.103.57 – 10.3.103.58	10.3.103.59
208	10.3.103.60/30	10.3.103.61 – 10.3.103.62	10.3.103.63
209	10.3.103.64/30	10.3.103.65 – 10.3.103.66	10.3.103.67
210	10.3.103.68/30	10.3.103.69 – 10.3.103.70	10.3.103.71
211	10.3.103.72/30	10.3.103.73 – 10.3.103.74	10.3.103.75
212	10.3.103.76/30	10.3.103.77 – 10.3.103.78	10.3.103.79
213	10.3.103.80/30	10.3.103.81 – 10.3.103.82	10.3.103.83
214	10.3.103.84/30	10.3.103.85 – 10.3.103.86	10.3.103.87
215	10.3.103.88/30	10.3.103.89 – 10.3.103.90	10.3.103.91
216	10.3.103.92/30	10.3.103.93 – 10.3.103.94	10.3.103.95
217	10.3.103.96/30	10.3.103.97 – 10.3.103.98	10.3.103.99
218	10.3.103.100/30	10.3.103.101 – 10.3.103.102	10.3.103.103
219	10.3.103.104/30	10.3.103.105 – 10.3.103.106	10.3.103.107
220	10.3.103.108/30	10.3.103.109 – 10.3.103.110	10.3.103.111
221	10.3.103.112/30	10.3.103.113 – 10.3.103.114	10.3.103.115
222	10.3.103.116/30	10.3.103.117 – 10.3.103.118	10.3.103.119
223	10.3.103.120/30	10.3.103.121 – 10.3.103.122	10.3.103.123
224	10.3.103.124/30	10.3.103.125 – 10.3.103.126	10.3.103.127
225	10.3.103.128/30	10.3.103.129 – 10.3.103.130	10.3.103.131
226	10.3.103.132/30	10.3.103.133 – 10.3.103.134	10.3.103.135
227	10.3.103.136/30	10.3.103.137 – 10.3.103.138	10.3.103.139
228	10.3.103.140/30	10.3.103.141 – 10.3.103.142	10.3.103.143
229	10.3.103.144/30	10.3.103.145 – 10.3.103.146	10.3.103.147
230	10.3.103.148/30	10.3.103.149 – 10.3.103.150	10.3.103.151
231	10.3.103.152/30	10.3.103.153 – 10.3.103.154	10.3.103.155
232	10.3.103.156/30	10.3.103.157 – 10.3.103.158	10.3.103.159
233	10.3.103.160/30	10.3.103.161 – 10.3.103.162	10.3.103.163
234	10.3.103.164/30	10.3.103.165 – 10.3.103.166	10.3.103.167
235	10.3.103.168/30	10.3.103.169 – 10.3.103.170	10.3.103.171
236	10.3.103.172/30	10.3.103.173 – 10.3.103.174	10.3.103.175
237	10.3.103.176/30	10.3.103.177 – 10.3.103.178	10.3.103.179
238	10.3.103.180/30	10.3.103.181 – 10.3.103.182	10.3.103.183
239	10.3.103.184/30	10.3.103.185 – 10.3.103.186	10.3.103.187
240	10.3.103.188/30	10.3.103.189 – 10.3.103.190	10.3.103.191
241	10.3.103.192/30	10.3.103.193 – 10.3.103.194	10.3.103.195
242	10.3.103.196/30	10.3.103.197 – 10.3.103.198	10.3.103.199
243	10.3.103.200/30	10.3.103.201 – 10.3.103.202	10.3.103.203
244	10.3.103.204/30	10.3.103.205 – 10.3.103.206	10.3.103.207
245	10.3.103.208/30	10.3.103.209 – 10.3.103.210	10.3.103.211
246	10.3.103.212/30	10.3.103.213 – 10.3.103.214	10.3.103.215
247	10.3.103.216/30	10.3.103.217 – 10.3.103.218	10.3.103.219
248	10.3.103.220/30	10.3.103.221 – 10.3.103.222	10.3.103.223
249	10.3.103.224/30	10.3.103.225 – 10.3.103.226	10.3.103.227
250	10.3.103.228/30	10.3.103.229 – 10.3.103.230	10.3.103.231
251	10.3.103.232/30	10.3.103.233 – 10.3.103.234	10.3.103.235
252	10.3.103.236/30	10.3.103.237 – 10.3.103.238	10.3.103.239
253	10.3.103.240/30	10.3.103.241 – 10.3.103.242	10.3.103.243
254	10.3.103.244/30	10.3.103.245 – 10.3.103.246	10.3.103.247
255	10.3.103.248/30	10.3.103.249 – 10.3.103.250	10.3.103.251
256	10.3.103.252/30	10.3.103.253 – 10.3.103.254	10.3.103.255

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 →