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)10.243.4.0/22

network10.243.4.0/22

broadcast10.243.7.255

first host10.243.4.1

last host10.243.7.254

subnet mask255.255.252.0

wildcard0.0.3.255

addresses1,024

usable hosts1,022

classA

ipcalc 10.243.4.0/22

address00001010.11110011.00000100.00000000

subnet mask11111111.11111111.11111100.00000000

network00001010.11110011.00000100.00000000

broadcast00001010.11110011.00000111.11111111

green = network part, grey = host part

hex0x0af30400

decimal183698432

reverse dns0.4.243.10.in-addr.arpa

ipv4-mapped::ffff:af3:400

/22 split into /30 · 256 subnets

close ×

#	network	host range	broadcast
1	10.243.4.0/30	10.243.4.1 – 10.243.4.2	10.243.4.3
2	10.243.4.4/30	10.243.4.5 – 10.243.4.6	10.243.4.7
3	10.243.4.8/30	10.243.4.9 – 10.243.4.10	10.243.4.11
4	10.243.4.12/30	10.243.4.13 – 10.243.4.14	10.243.4.15
5	10.243.4.16/30	10.243.4.17 – 10.243.4.18	10.243.4.19
6	10.243.4.20/30	10.243.4.21 – 10.243.4.22	10.243.4.23
7	10.243.4.24/30	10.243.4.25 – 10.243.4.26	10.243.4.27
8	10.243.4.28/30	10.243.4.29 – 10.243.4.30	10.243.4.31
9	10.243.4.32/30	10.243.4.33 – 10.243.4.34	10.243.4.35
10	10.243.4.36/30	10.243.4.37 – 10.243.4.38	10.243.4.39
11	10.243.4.40/30	10.243.4.41 – 10.243.4.42	10.243.4.43
12	10.243.4.44/30	10.243.4.45 – 10.243.4.46	10.243.4.47
13	10.243.4.48/30	10.243.4.49 – 10.243.4.50	10.243.4.51
14	10.243.4.52/30	10.243.4.53 – 10.243.4.54	10.243.4.55
15	10.243.4.56/30	10.243.4.57 – 10.243.4.58	10.243.4.59
16	10.243.4.60/30	10.243.4.61 – 10.243.4.62	10.243.4.63
17	10.243.4.64/30	10.243.4.65 – 10.243.4.66	10.243.4.67
18	10.243.4.68/30	10.243.4.69 – 10.243.4.70	10.243.4.71
19	10.243.4.72/30	10.243.4.73 – 10.243.4.74	10.243.4.75
20	10.243.4.76/30	10.243.4.77 – 10.243.4.78	10.243.4.79
21	10.243.4.80/30	10.243.4.81 – 10.243.4.82	10.243.4.83
22	10.243.4.84/30	10.243.4.85 – 10.243.4.86	10.243.4.87
23	10.243.4.88/30	10.243.4.89 – 10.243.4.90	10.243.4.91
24	10.243.4.92/30	10.243.4.93 – 10.243.4.94	10.243.4.95
25	10.243.4.96/30	10.243.4.97 – 10.243.4.98	10.243.4.99
26	10.243.4.100/30	10.243.4.101 – 10.243.4.102	10.243.4.103
27	10.243.4.104/30	10.243.4.105 – 10.243.4.106	10.243.4.107
28	10.243.4.108/30	10.243.4.109 – 10.243.4.110	10.243.4.111
29	10.243.4.112/30	10.243.4.113 – 10.243.4.114	10.243.4.115
30	10.243.4.116/30	10.243.4.117 – 10.243.4.118	10.243.4.119
31	10.243.4.120/30	10.243.4.121 – 10.243.4.122	10.243.4.123
32	10.243.4.124/30	10.243.4.125 – 10.243.4.126	10.243.4.127
33	10.243.4.128/30	10.243.4.129 – 10.243.4.130	10.243.4.131
34	10.243.4.132/30	10.243.4.133 – 10.243.4.134	10.243.4.135
35	10.243.4.136/30	10.243.4.137 – 10.243.4.138	10.243.4.139
36	10.243.4.140/30	10.243.4.141 – 10.243.4.142	10.243.4.143
37	10.243.4.144/30	10.243.4.145 – 10.243.4.146	10.243.4.147
38	10.243.4.148/30	10.243.4.149 – 10.243.4.150	10.243.4.151
39	10.243.4.152/30	10.243.4.153 – 10.243.4.154	10.243.4.155
40	10.243.4.156/30	10.243.4.157 – 10.243.4.158	10.243.4.159
41	10.243.4.160/30	10.243.4.161 – 10.243.4.162	10.243.4.163
42	10.243.4.164/30	10.243.4.165 – 10.243.4.166	10.243.4.167
43	10.243.4.168/30	10.243.4.169 – 10.243.4.170	10.243.4.171
44	10.243.4.172/30	10.243.4.173 – 10.243.4.174	10.243.4.175
45	10.243.4.176/30	10.243.4.177 – 10.243.4.178	10.243.4.179
46	10.243.4.180/30	10.243.4.181 – 10.243.4.182	10.243.4.183
47	10.243.4.184/30	10.243.4.185 – 10.243.4.186	10.243.4.187
48	10.243.4.188/30	10.243.4.189 – 10.243.4.190	10.243.4.191
49	10.243.4.192/30	10.243.4.193 – 10.243.4.194	10.243.4.195
50	10.243.4.196/30	10.243.4.197 – 10.243.4.198	10.243.4.199
51	10.243.4.200/30	10.243.4.201 – 10.243.4.202	10.243.4.203
52	10.243.4.204/30	10.243.4.205 – 10.243.4.206	10.243.4.207
53	10.243.4.208/30	10.243.4.209 – 10.243.4.210	10.243.4.211
54	10.243.4.212/30	10.243.4.213 – 10.243.4.214	10.243.4.215
55	10.243.4.216/30	10.243.4.217 – 10.243.4.218	10.243.4.219
56	10.243.4.220/30	10.243.4.221 – 10.243.4.222	10.243.4.223
57	10.243.4.224/30	10.243.4.225 – 10.243.4.226	10.243.4.227
58	10.243.4.228/30	10.243.4.229 – 10.243.4.230	10.243.4.231
59	10.243.4.232/30	10.243.4.233 – 10.243.4.234	10.243.4.235
60	10.243.4.236/30	10.243.4.237 – 10.243.4.238	10.243.4.239
61	10.243.4.240/30	10.243.4.241 – 10.243.4.242	10.243.4.243
62	10.243.4.244/30	10.243.4.245 – 10.243.4.246	10.243.4.247
63	10.243.4.248/30	10.243.4.249 – 10.243.4.250	10.243.4.251
64	10.243.4.252/30	10.243.4.253 – 10.243.4.254	10.243.4.255
65	10.243.5.0/30	10.243.5.1 – 10.243.5.2	10.243.5.3
66	10.243.5.4/30	10.243.5.5 – 10.243.5.6	10.243.5.7
67	10.243.5.8/30	10.243.5.9 – 10.243.5.10	10.243.5.11
68	10.243.5.12/30	10.243.5.13 – 10.243.5.14	10.243.5.15
69	10.243.5.16/30	10.243.5.17 – 10.243.5.18	10.243.5.19
70	10.243.5.20/30	10.243.5.21 – 10.243.5.22	10.243.5.23
71	10.243.5.24/30	10.243.5.25 – 10.243.5.26	10.243.5.27
72	10.243.5.28/30	10.243.5.29 – 10.243.5.30	10.243.5.31
73	10.243.5.32/30	10.243.5.33 – 10.243.5.34	10.243.5.35
74	10.243.5.36/30	10.243.5.37 – 10.243.5.38	10.243.5.39
75	10.243.5.40/30	10.243.5.41 – 10.243.5.42	10.243.5.43
76	10.243.5.44/30	10.243.5.45 – 10.243.5.46	10.243.5.47
77	10.243.5.48/30	10.243.5.49 – 10.243.5.50	10.243.5.51
78	10.243.5.52/30	10.243.5.53 – 10.243.5.54	10.243.5.55
79	10.243.5.56/30	10.243.5.57 – 10.243.5.58	10.243.5.59
80	10.243.5.60/30	10.243.5.61 – 10.243.5.62	10.243.5.63
81	10.243.5.64/30	10.243.5.65 – 10.243.5.66	10.243.5.67
82	10.243.5.68/30	10.243.5.69 – 10.243.5.70	10.243.5.71
83	10.243.5.72/30	10.243.5.73 – 10.243.5.74	10.243.5.75
84	10.243.5.76/30	10.243.5.77 – 10.243.5.78	10.243.5.79
85	10.243.5.80/30	10.243.5.81 – 10.243.5.82	10.243.5.83
86	10.243.5.84/30	10.243.5.85 – 10.243.5.86	10.243.5.87
87	10.243.5.88/30	10.243.5.89 – 10.243.5.90	10.243.5.91
88	10.243.5.92/30	10.243.5.93 – 10.243.5.94	10.243.5.95
89	10.243.5.96/30	10.243.5.97 – 10.243.5.98	10.243.5.99
90	10.243.5.100/30	10.243.5.101 – 10.243.5.102	10.243.5.103
91	10.243.5.104/30	10.243.5.105 – 10.243.5.106	10.243.5.107
92	10.243.5.108/30	10.243.5.109 – 10.243.5.110	10.243.5.111
93	10.243.5.112/30	10.243.5.113 – 10.243.5.114	10.243.5.115
94	10.243.5.116/30	10.243.5.117 – 10.243.5.118	10.243.5.119
95	10.243.5.120/30	10.243.5.121 – 10.243.5.122	10.243.5.123
96	10.243.5.124/30	10.243.5.125 – 10.243.5.126	10.243.5.127
97	10.243.5.128/30	10.243.5.129 – 10.243.5.130	10.243.5.131
98	10.243.5.132/30	10.243.5.133 – 10.243.5.134	10.243.5.135
99	10.243.5.136/30	10.243.5.137 – 10.243.5.138	10.243.5.139
100	10.243.5.140/30	10.243.5.141 – 10.243.5.142	10.243.5.143
101	10.243.5.144/30	10.243.5.145 – 10.243.5.146	10.243.5.147
102	10.243.5.148/30	10.243.5.149 – 10.243.5.150	10.243.5.151
103	10.243.5.152/30	10.243.5.153 – 10.243.5.154	10.243.5.155
104	10.243.5.156/30	10.243.5.157 – 10.243.5.158	10.243.5.159
105	10.243.5.160/30	10.243.5.161 – 10.243.5.162	10.243.5.163
106	10.243.5.164/30	10.243.5.165 – 10.243.5.166	10.243.5.167
107	10.243.5.168/30	10.243.5.169 – 10.243.5.170	10.243.5.171
108	10.243.5.172/30	10.243.5.173 – 10.243.5.174	10.243.5.175
109	10.243.5.176/30	10.243.5.177 – 10.243.5.178	10.243.5.179
110	10.243.5.180/30	10.243.5.181 – 10.243.5.182	10.243.5.183
111	10.243.5.184/30	10.243.5.185 – 10.243.5.186	10.243.5.187
112	10.243.5.188/30	10.243.5.189 – 10.243.5.190	10.243.5.191
113	10.243.5.192/30	10.243.5.193 – 10.243.5.194	10.243.5.195
114	10.243.5.196/30	10.243.5.197 – 10.243.5.198	10.243.5.199
115	10.243.5.200/30	10.243.5.201 – 10.243.5.202	10.243.5.203
116	10.243.5.204/30	10.243.5.205 – 10.243.5.206	10.243.5.207
117	10.243.5.208/30	10.243.5.209 – 10.243.5.210	10.243.5.211
118	10.243.5.212/30	10.243.5.213 – 10.243.5.214	10.243.5.215
119	10.243.5.216/30	10.243.5.217 – 10.243.5.218	10.243.5.219
120	10.243.5.220/30	10.243.5.221 – 10.243.5.222	10.243.5.223
121	10.243.5.224/30	10.243.5.225 – 10.243.5.226	10.243.5.227
122	10.243.5.228/30	10.243.5.229 – 10.243.5.230	10.243.5.231
123	10.243.5.232/30	10.243.5.233 – 10.243.5.234	10.243.5.235
124	10.243.5.236/30	10.243.5.237 – 10.243.5.238	10.243.5.239
125	10.243.5.240/30	10.243.5.241 – 10.243.5.242	10.243.5.243
126	10.243.5.244/30	10.243.5.245 – 10.243.5.246	10.243.5.247
127	10.243.5.248/30	10.243.5.249 – 10.243.5.250	10.243.5.251
128	10.243.5.252/30	10.243.5.253 – 10.243.5.254	10.243.5.255
129	10.243.6.0/30	10.243.6.1 – 10.243.6.2	10.243.6.3
130	10.243.6.4/30	10.243.6.5 – 10.243.6.6	10.243.6.7
131	10.243.6.8/30	10.243.6.9 – 10.243.6.10	10.243.6.11
132	10.243.6.12/30	10.243.6.13 – 10.243.6.14	10.243.6.15
133	10.243.6.16/30	10.243.6.17 – 10.243.6.18	10.243.6.19
134	10.243.6.20/30	10.243.6.21 – 10.243.6.22	10.243.6.23
135	10.243.6.24/30	10.243.6.25 – 10.243.6.26	10.243.6.27
136	10.243.6.28/30	10.243.6.29 – 10.243.6.30	10.243.6.31
137	10.243.6.32/30	10.243.6.33 – 10.243.6.34	10.243.6.35
138	10.243.6.36/30	10.243.6.37 – 10.243.6.38	10.243.6.39
139	10.243.6.40/30	10.243.6.41 – 10.243.6.42	10.243.6.43
140	10.243.6.44/30	10.243.6.45 – 10.243.6.46	10.243.6.47
141	10.243.6.48/30	10.243.6.49 – 10.243.6.50	10.243.6.51
142	10.243.6.52/30	10.243.6.53 – 10.243.6.54	10.243.6.55
143	10.243.6.56/30	10.243.6.57 – 10.243.6.58	10.243.6.59
144	10.243.6.60/30	10.243.6.61 – 10.243.6.62	10.243.6.63
145	10.243.6.64/30	10.243.6.65 – 10.243.6.66	10.243.6.67
146	10.243.6.68/30	10.243.6.69 – 10.243.6.70	10.243.6.71
147	10.243.6.72/30	10.243.6.73 – 10.243.6.74	10.243.6.75
148	10.243.6.76/30	10.243.6.77 – 10.243.6.78	10.243.6.79
149	10.243.6.80/30	10.243.6.81 – 10.243.6.82	10.243.6.83
150	10.243.6.84/30	10.243.6.85 – 10.243.6.86	10.243.6.87
151	10.243.6.88/30	10.243.6.89 – 10.243.6.90	10.243.6.91
152	10.243.6.92/30	10.243.6.93 – 10.243.6.94	10.243.6.95
153	10.243.6.96/30	10.243.6.97 – 10.243.6.98	10.243.6.99
154	10.243.6.100/30	10.243.6.101 – 10.243.6.102	10.243.6.103
155	10.243.6.104/30	10.243.6.105 – 10.243.6.106	10.243.6.107
156	10.243.6.108/30	10.243.6.109 – 10.243.6.110	10.243.6.111
157	10.243.6.112/30	10.243.6.113 – 10.243.6.114	10.243.6.115
158	10.243.6.116/30	10.243.6.117 – 10.243.6.118	10.243.6.119
159	10.243.6.120/30	10.243.6.121 – 10.243.6.122	10.243.6.123
160	10.243.6.124/30	10.243.6.125 – 10.243.6.126	10.243.6.127
161	10.243.6.128/30	10.243.6.129 – 10.243.6.130	10.243.6.131
162	10.243.6.132/30	10.243.6.133 – 10.243.6.134	10.243.6.135
163	10.243.6.136/30	10.243.6.137 – 10.243.6.138	10.243.6.139
164	10.243.6.140/30	10.243.6.141 – 10.243.6.142	10.243.6.143
165	10.243.6.144/30	10.243.6.145 – 10.243.6.146	10.243.6.147
166	10.243.6.148/30	10.243.6.149 – 10.243.6.150	10.243.6.151
167	10.243.6.152/30	10.243.6.153 – 10.243.6.154	10.243.6.155
168	10.243.6.156/30	10.243.6.157 – 10.243.6.158	10.243.6.159
169	10.243.6.160/30	10.243.6.161 – 10.243.6.162	10.243.6.163
170	10.243.6.164/30	10.243.6.165 – 10.243.6.166	10.243.6.167
171	10.243.6.168/30	10.243.6.169 – 10.243.6.170	10.243.6.171
172	10.243.6.172/30	10.243.6.173 – 10.243.6.174	10.243.6.175
173	10.243.6.176/30	10.243.6.177 – 10.243.6.178	10.243.6.179
174	10.243.6.180/30	10.243.6.181 – 10.243.6.182	10.243.6.183
175	10.243.6.184/30	10.243.6.185 – 10.243.6.186	10.243.6.187
176	10.243.6.188/30	10.243.6.189 – 10.243.6.190	10.243.6.191
177	10.243.6.192/30	10.243.6.193 – 10.243.6.194	10.243.6.195
178	10.243.6.196/30	10.243.6.197 – 10.243.6.198	10.243.6.199
179	10.243.6.200/30	10.243.6.201 – 10.243.6.202	10.243.6.203
180	10.243.6.204/30	10.243.6.205 – 10.243.6.206	10.243.6.207
181	10.243.6.208/30	10.243.6.209 – 10.243.6.210	10.243.6.211
182	10.243.6.212/30	10.243.6.213 – 10.243.6.214	10.243.6.215
183	10.243.6.216/30	10.243.6.217 – 10.243.6.218	10.243.6.219
184	10.243.6.220/30	10.243.6.221 – 10.243.6.222	10.243.6.223
185	10.243.6.224/30	10.243.6.225 – 10.243.6.226	10.243.6.227
186	10.243.6.228/30	10.243.6.229 – 10.243.6.230	10.243.6.231
187	10.243.6.232/30	10.243.6.233 – 10.243.6.234	10.243.6.235
188	10.243.6.236/30	10.243.6.237 – 10.243.6.238	10.243.6.239
189	10.243.6.240/30	10.243.6.241 – 10.243.6.242	10.243.6.243
190	10.243.6.244/30	10.243.6.245 – 10.243.6.246	10.243.6.247
191	10.243.6.248/30	10.243.6.249 – 10.243.6.250	10.243.6.251
192	10.243.6.252/30	10.243.6.253 – 10.243.6.254	10.243.6.255
193	10.243.7.0/30	10.243.7.1 – 10.243.7.2	10.243.7.3
194	10.243.7.4/30	10.243.7.5 – 10.243.7.6	10.243.7.7
195	10.243.7.8/30	10.243.7.9 – 10.243.7.10	10.243.7.11
196	10.243.7.12/30	10.243.7.13 – 10.243.7.14	10.243.7.15
197	10.243.7.16/30	10.243.7.17 – 10.243.7.18	10.243.7.19
198	10.243.7.20/30	10.243.7.21 – 10.243.7.22	10.243.7.23
199	10.243.7.24/30	10.243.7.25 – 10.243.7.26	10.243.7.27
200	10.243.7.28/30	10.243.7.29 – 10.243.7.30	10.243.7.31
201	10.243.7.32/30	10.243.7.33 – 10.243.7.34	10.243.7.35
202	10.243.7.36/30	10.243.7.37 – 10.243.7.38	10.243.7.39
203	10.243.7.40/30	10.243.7.41 – 10.243.7.42	10.243.7.43
204	10.243.7.44/30	10.243.7.45 – 10.243.7.46	10.243.7.47
205	10.243.7.48/30	10.243.7.49 – 10.243.7.50	10.243.7.51
206	10.243.7.52/30	10.243.7.53 – 10.243.7.54	10.243.7.55
207	10.243.7.56/30	10.243.7.57 – 10.243.7.58	10.243.7.59
208	10.243.7.60/30	10.243.7.61 – 10.243.7.62	10.243.7.63
209	10.243.7.64/30	10.243.7.65 – 10.243.7.66	10.243.7.67
210	10.243.7.68/30	10.243.7.69 – 10.243.7.70	10.243.7.71
211	10.243.7.72/30	10.243.7.73 – 10.243.7.74	10.243.7.75
212	10.243.7.76/30	10.243.7.77 – 10.243.7.78	10.243.7.79
213	10.243.7.80/30	10.243.7.81 – 10.243.7.82	10.243.7.83
214	10.243.7.84/30	10.243.7.85 – 10.243.7.86	10.243.7.87
215	10.243.7.88/30	10.243.7.89 – 10.243.7.90	10.243.7.91
216	10.243.7.92/30	10.243.7.93 – 10.243.7.94	10.243.7.95
217	10.243.7.96/30	10.243.7.97 – 10.243.7.98	10.243.7.99
218	10.243.7.100/30	10.243.7.101 – 10.243.7.102	10.243.7.103
219	10.243.7.104/30	10.243.7.105 – 10.243.7.106	10.243.7.107
220	10.243.7.108/30	10.243.7.109 – 10.243.7.110	10.243.7.111
221	10.243.7.112/30	10.243.7.113 – 10.243.7.114	10.243.7.115
222	10.243.7.116/30	10.243.7.117 – 10.243.7.118	10.243.7.119
223	10.243.7.120/30	10.243.7.121 – 10.243.7.122	10.243.7.123
224	10.243.7.124/30	10.243.7.125 – 10.243.7.126	10.243.7.127
225	10.243.7.128/30	10.243.7.129 – 10.243.7.130	10.243.7.131
226	10.243.7.132/30	10.243.7.133 – 10.243.7.134	10.243.7.135
227	10.243.7.136/30	10.243.7.137 – 10.243.7.138	10.243.7.139
228	10.243.7.140/30	10.243.7.141 – 10.243.7.142	10.243.7.143
229	10.243.7.144/30	10.243.7.145 – 10.243.7.146	10.243.7.147
230	10.243.7.148/30	10.243.7.149 – 10.243.7.150	10.243.7.151
231	10.243.7.152/30	10.243.7.153 – 10.243.7.154	10.243.7.155
232	10.243.7.156/30	10.243.7.157 – 10.243.7.158	10.243.7.159
233	10.243.7.160/30	10.243.7.161 – 10.243.7.162	10.243.7.163
234	10.243.7.164/30	10.243.7.165 – 10.243.7.166	10.243.7.167
235	10.243.7.168/30	10.243.7.169 – 10.243.7.170	10.243.7.171
236	10.243.7.172/30	10.243.7.173 – 10.243.7.174	10.243.7.175
237	10.243.7.176/30	10.243.7.177 – 10.243.7.178	10.243.7.179
238	10.243.7.180/30	10.243.7.181 – 10.243.7.182	10.243.7.183
239	10.243.7.184/30	10.243.7.185 – 10.243.7.186	10.243.7.187
240	10.243.7.188/30	10.243.7.189 – 10.243.7.190	10.243.7.191
241	10.243.7.192/30	10.243.7.193 – 10.243.7.194	10.243.7.195
242	10.243.7.196/30	10.243.7.197 – 10.243.7.198	10.243.7.199
243	10.243.7.200/30	10.243.7.201 – 10.243.7.202	10.243.7.203
244	10.243.7.204/30	10.243.7.205 – 10.243.7.206	10.243.7.207
245	10.243.7.208/30	10.243.7.209 – 10.243.7.210	10.243.7.211
246	10.243.7.212/30	10.243.7.213 – 10.243.7.214	10.243.7.215
247	10.243.7.216/30	10.243.7.217 – 10.243.7.218	10.243.7.219
248	10.243.7.220/30	10.243.7.221 – 10.243.7.222	10.243.7.223
249	10.243.7.224/30	10.243.7.225 – 10.243.7.226	10.243.7.227
250	10.243.7.228/30	10.243.7.229 – 10.243.7.230	10.243.7.231
251	10.243.7.232/30	10.243.7.233 – 10.243.7.234	10.243.7.235
252	10.243.7.236/30	10.243.7.237 – 10.243.7.238	10.243.7.239
253	10.243.7.240/30	10.243.7.241 – 10.243.7.242	10.243.7.243
254	10.243.7.244/30	10.243.7.245 – 10.243.7.246	10.243.7.247
255	10.243.7.248/30	10.243.7.249 – 10.243.7.250	10.243.7.251
256	10.243.7.252/30	10.243.7.253 – 10.243.7.254	10.243.7.255

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 →