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)10.40.0.0/18

network10.40.0.0/18

broadcast10.40.63.255

first host10.40.0.1

last host10.40.63.254

subnet mask255.255.192.0

wildcard0.0.63.255

addresses16,384

usable hosts16,382

classA

ipcalc 10.40.0.0/18

address00001010.00101000.00000000.00000000

subnet mask11111111.11111111.11000000.00000000

network00001010.00101000.00000000.00000000

broadcast00001010.00101000.00111111.11111111

green = network part, grey = host part

hex0x0a280000

decimal170393600

reverse dns0.0.40.10.in-addr.arpa

ipv4-mapped::ffff:a28:0

/18 split into /30 · 4,096 subnets

close ×

#	network	host range	broadcast
1	10.40.0.0/30	10.40.0.1 – 10.40.0.2	10.40.0.3
2	10.40.0.4/30	10.40.0.5 – 10.40.0.6	10.40.0.7
3	10.40.0.8/30	10.40.0.9 – 10.40.0.10	10.40.0.11
4	10.40.0.12/30	10.40.0.13 – 10.40.0.14	10.40.0.15
5	10.40.0.16/30	10.40.0.17 – 10.40.0.18	10.40.0.19
6	10.40.0.20/30	10.40.0.21 – 10.40.0.22	10.40.0.23
7	10.40.0.24/30	10.40.0.25 – 10.40.0.26	10.40.0.27
8	10.40.0.28/30	10.40.0.29 – 10.40.0.30	10.40.0.31
9	10.40.0.32/30	10.40.0.33 – 10.40.0.34	10.40.0.35
10	10.40.0.36/30	10.40.0.37 – 10.40.0.38	10.40.0.39
11	10.40.0.40/30	10.40.0.41 – 10.40.0.42	10.40.0.43
12	10.40.0.44/30	10.40.0.45 – 10.40.0.46	10.40.0.47
13	10.40.0.48/30	10.40.0.49 – 10.40.0.50	10.40.0.51
14	10.40.0.52/30	10.40.0.53 – 10.40.0.54	10.40.0.55
15	10.40.0.56/30	10.40.0.57 – 10.40.0.58	10.40.0.59
16	10.40.0.60/30	10.40.0.61 – 10.40.0.62	10.40.0.63
17	10.40.0.64/30	10.40.0.65 – 10.40.0.66	10.40.0.67
18	10.40.0.68/30	10.40.0.69 – 10.40.0.70	10.40.0.71
19	10.40.0.72/30	10.40.0.73 – 10.40.0.74	10.40.0.75
20	10.40.0.76/30	10.40.0.77 – 10.40.0.78	10.40.0.79
21	10.40.0.80/30	10.40.0.81 – 10.40.0.82	10.40.0.83
22	10.40.0.84/30	10.40.0.85 – 10.40.0.86	10.40.0.87
23	10.40.0.88/30	10.40.0.89 – 10.40.0.90	10.40.0.91
24	10.40.0.92/30	10.40.0.93 – 10.40.0.94	10.40.0.95
25	10.40.0.96/30	10.40.0.97 – 10.40.0.98	10.40.0.99
26	10.40.0.100/30	10.40.0.101 – 10.40.0.102	10.40.0.103
27	10.40.0.104/30	10.40.0.105 – 10.40.0.106	10.40.0.107
28	10.40.0.108/30	10.40.0.109 – 10.40.0.110	10.40.0.111
29	10.40.0.112/30	10.40.0.113 – 10.40.0.114	10.40.0.115
30	10.40.0.116/30	10.40.0.117 – 10.40.0.118	10.40.0.119
31	10.40.0.120/30	10.40.0.121 – 10.40.0.122	10.40.0.123
32	10.40.0.124/30	10.40.0.125 – 10.40.0.126	10.40.0.127
33	10.40.0.128/30	10.40.0.129 – 10.40.0.130	10.40.0.131
34	10.40.0.132/30	10.40.0.133 – 10.40.0.134	10.40.0.135
35	10.40.0.136/30	10.40.0.137 – 10.40.0.138	10.40.0.139
36	10.40.0.140/30	10.40.0.141 – 10.40.0.142	10.40.0.143
37	10.40.0.144/30	10.40.0.145 – 10.40.0.146	10.40.0.147
38	10.40.0.148/30	10.40.0.149 – 10.40.0.150	10.40.0.151
39	10.40.0.152/30	10.40.0.153 – 10.40.0.154	10.40.0.155
40	10.40.0.156/30	10.40.0.157 – 10.40.0.158	10.40.0.159
41	10.40.0.160/30	10.40.0.161 – 10.40.0.162	10.40.0.163
42	10.40.0.164/30	10.40.0.165 – 10.40.0.166	10.40.0.167
43	10.40.0.168/30	10.40.0.169 – 10.40.0.170	10.40.0.171
44	10.40.0.172/30	10.40.0.173 – 10.40.0.174	10.40.0.175
45	10.40.0.176/30	10.40.0.177 – 10.40.0.178	10.40.0.179
46	10.40.0.180/30	10.40.0.181 – 10.40.0.182	10.40.0.183
47	10.40.0.184/30	10.40.0.185 – 10.40.0.186	10.40.0.187
48	10.40.0.188/30	10.40.0.189 – 10.40.0.190	10.40.0.191
49	10.40.0.192/30	10.40.0.193 – 10.40.0.194	10.40.0.195
50	10.40.0.196/30	10.40.0.197 – 10.40.0.198	10.40.0.199
51	10.40.0.200/30	10.40.0.201 – 10.40.0.202	10.40.0.203
52	10.40.0.204/30	10.40.0.205 – 10.40.0.206	10.40.0.207
53	10.40.0.208/30	10.40.0.209 – 10.40.0.210	10.40.0.211
54	10.40.0.212/30	10.40.0.213 – 10.40.0.214	10.40.0.215
55	10.40.0.216/30	10.40.0.217 – 10.40.0.218	10.40.0.219
56	10.40.0.220/30	10.40.0.221 – 10.40.0.222	10.40.0.223
57	10.40.0.224/30	10.40.0.225 – 10.40.0.226	10.40.0.227
58	10.40.0.228/30	10.40.0.229 – 10.40.0.230	10.40.0.231
59	10.40.0.232/30	10.40.0.233 – 10.40.0.234	10.40.0.235
60	10.40.0.236/30	10.40.0.237 – 10.40.0.238	10.40.0.239
61	10.40.0.240/30	10.40.0.241 – 10.40.0.242	10.40.0.243
62	10.40.0.244/30	10.40.0.245 – 10.40.0.246	10.40.0.247
63	10.40.0.248/30	10.40.0.249 – 10.40.0.250	10.40.0.251
64	10.40.0.252/30	10.40.0.253 – 10.40.0.254	10.40.0.255
65	10.40.1.0/30	10.40.1.1 – 10.40.1.2	10.40.1.3
66	10.40.1.4/30	10.40.1.5 – 10.40.1.6	10.40.1.7
67	10.40.1.8/30	10.40.1.9 – 10.40.1.10	10.40.1.11
68	10.40.1.12/30	10.40.1.13 – 10.40.1.14	10.40.1.15
69	10.40.1.16/30	10.40.1.17 – 10.40.1.18	10.40.1.19
70	10.40.1.20/30	10.40.1.21 – 10.40.1.22	10.40.1.23
71	10.40.1.24/30	10.40.1.25 – 10.40.1.26	10.40.1.27
72	10.40.1.28/30	10.40.1.29 – 10.40.1.30	10.40.1.31
73	10.40.1.32/30	10.40.1.33 – 10.40.1.34	10.40.1.35
74	10.40.1.36/30	10.40.1.37 – 10.40.1.38	10.40.1.39
75	10.40.1.40/30	10.40.1.41 – 10.40.1.42	10.40.1.43
76	10.40.1.44/30	10.40.1.45 – 10.40.1.46	10.40.1.47
77	10.40.1.48/30	10.40.1.49 – 10.40.1.50	10.40.1.51
78	10.40.1.52/30	10.40.1.53 – 10.40.1.54	10.40.1.55
79	10.40.1.56/30	10.40.1.57 – 10.40.1.58	10.40.1.59
80	10.40.1.60/30	10.40.1.61 – 10.40.1.62	10.40.1.63
81	10.40.1.64/30	10.40.1.65 – 10.40.1.66	10.40.1.67
82	10.40.1.68/30	10.40.1.69 – 10.40.1.70	10.40.1.71
83	10.40.1.72/30	10.40.1.73 – 10.40.1.74	10.40.1.75
84	10.40.1.76/30	10.40.1.77 – 10.40.1.78	10.40.1.79
85	10.40.1.80/30	10.40.1.81 – 10.40.1.82	10.40.1.83
86	10.40.1.84/30	10.40.1.85 – 10.40.1.86	10.40.1.87
87	10.40.1.88/30	10.40.1.89 – 10.40.1.90	10.40.1.91
88	10.40.1.92/30	10.40.1.93 – 10.40.1.94	10.40.1.95
89	10.40.1.96/30	10.40.1.97 – 10.40.1.98	10.40.1.99
90	10.40.1.100/30	10.40.1.101 – 10.40.1.102	10.40.1.103
91	10.40.1.104/30	10.40.1.105 – 10.40.1.106	10.40.1.107
92	10.40.1.108/30	10.40.1.109 – 10.40.1.110	10.40.1.111
93	10.40.1.112/30	10.40.1.113 – 10.40.1.114	10.40.1.115
94	10.40.1.116/30	10.40.1.117 – 10.40.1.118	10.40.1.119
95	10.40.1.120/30	10.40.1.121 – 10.40.1.122	10.40.1.123
96	10.40.1.124/30	10.40.1.125 – 10.40.1.126	10.40.1.127
97	10.40.1.128/30	10.40.1.129 – 10.40.1.130	10.40.1.131
98	10.40.1.132/30	10.40.1.133 – 10.40.1.134	10.40.1.135
99	10.40.1.136/30	10.40.1.137 – 10.40.1.138	10.40.1.139
100	10.40.1.140/30	10.40.1.141 – 10.40.1.142	10.40.1.143
101	10.40.1.144/30	10.40.1.145 – 10.40.1.146	10.40.1.147
102	10.40.1.148/30	10.40.1.149 – 10.40.1.150	10.40.1.151
103	10.40.1.152/30	10.40.1.153 – 10.40.1.154	10.40.1.155
104	10.40.1.156/30	10.40.1.157 – 10.40.1.158	10.40.1.159
105	10.40.1.160/30	10.40.1.161 – 10.40.1.162	10.40.1.163
106	10.40.1.164/30	10.40.1.165 – 10.40.1.166	10.40.1.167
107	10.40.1.168/30	10.40.1.169 – 10.40.1.170	10.40.1.171
108	10.40.1.172/30	10.40.1.173 – 10.40.1.174	10.40.1.175
109	10.40.1.176/30	10.40.1.177 – 10.40.1.178	10.40.1.179
110	10.40.1.180/30	10.40.1.181 – 10.40.1.182	10.40.1.183
111	10.40.1.184/30	10.40.1.185 – 10.40.1.186	10.40.1.187
112	10.40.1.188/30	10.40.1.189 – 10.40.1.190	10.40.1.191
113	10.40.1.192/30	10.40.1.193 – 10.40.1.194	10.40.1.195
114	10.40.1.196/30	10.40.1.197 – 10.40.1.198	10.40.1.199
115	10.40.1.200/30	10.40.1.201 – 10.40.1.202	10.40.1.203
116	10.40.1.204/30	10.40.1.205 – 10.40.1.206	10.40.1.207
117	10.40.1.208/30	10.40.1.209 – 10.40.1.210	10.40.1.211
118	10.40.1.212/30	10.40.1.213 – 10.40.1.214	10.40.1.215
119	10.40.1.216/30	10.40.1.217 – 10.40.1.218	10.40.1.219
120	10.40.1.220/30	10.40.1.221 – 10.40.1.222	10.40.1.223
121	10.40.1.224/30	10.40.1.225 – 10.40.1.226	10.40.1.227
122	10.40.1.228/30	10.40.1.229 – 10.40.1.230	10.40.1.231
123	10.40.1.232/30	10.40.1.233 – 10.40.1.234	10.40.1.235
124	10.40.1.236/30	10.40.1.237 – 10.40.1.238	10.40.1.239
125	10.40.1.240/30	10.40.1.241 – 10.40.1.242	10.40.1.243
126	10.40.1.244/30	10.40.1.245 – 10.40.1.246	10.40.1.247
127	10.40.1.248/30	10.40.1.249 – 10.40.1.250	10.40.1.251
128	10.40.1.252/30	10.40.1.253 – 10.40.1.254	10.40.1.255
129	10.40.2.0/30	10.40.2.1 – 10.40.2.2	10.40.2.3
130	10.40.2.4/30	10.40.2.5 – 10.40.2.6	10.40.2.7
131	10.40.2.8/30	10.40.2.9 – 10.40.2.10	10.40.2.11
132	10.40.2.12/30	10.40.2.13 – 10.40.2.14	10.40.2.15
133	10.40.2.16/30	10.40.2.17 – 10.40.2.18	10.40.2.19
134	10.40.2.20/30	10.40.2.21 – 10.40.2.22	10.40.2.23
135	10.40.2.24/30	10.40.2.25 – 10.40.2.26	10.40.2.27
136	10.40.2.28/30	10.40.2.29 – 10.40.2.30	10.40.2.31
137	10.40.2.32/30	10.40.2.33 – 10.40.2.34	10.40.2.35
138	10.40.2.36/30	10.40.2.37 – 10.40.2.38	10.40.2.39
139	10.40.2.40/30	10.40.2.41 – 10.40.2.42	10.40.2.43
140	10.40.2.44/30	10.40.2.45 – 10.40.2.46	10.40.2.47
141	10.40.2.48/30	10.40.2.49 – 10.40.2.50	10.40.2.51
142	10.40.2.52/30	10.40.2.53 – 10.40.2.54	10.40.2.55
143	10.40.2.56/30	10.40.2.57 – 10.40.2.58	10.40.2.59
144	10.40.2.60/30	10.40.2.61 – 10.40.2.62	10.40.2.63
145	10.40.2.64/30	10.40.2.65 – 10.40.2.66	10.40.2.67
146	10.40.2.68/30	10.40.2.69 – 10.40.2.70	10.40.2.71
147	10.40.2.72/30	10.40.2.73 – 10.40.2.74	10.40.2.75
148	10.40.2.76/30	10.40.2.77 – 10.40.2.78	10.40.2.79
149	10.40.2.80/30	10.40.2.81 – 10.40.2.82	10.40.2.83
150	10.40.2.84/30	10.40.2.85 – 10.40.2.86	10.40.2.87
151	10.40.2.88/30	10.40.2.89 – 10.40.2.90	10.40.2.91
152	10.40.2.92/30	10.40.2.93 – 10.40.2.94	10.40.2.95
153	10.40.2.96/30	10.40.2.97 – 10.40.2.98	10.40.2.99
154	10.40.2.100/30	10.40.2.101 – 10.40.2.102	10.40.2.103
155	10.40.2.104/30	10.40.2.105 – 10.40.2.106	10.40.2.107
156	10.40.2.108/30	10.40.2.109 – 10.40.2.110	10.40.2.111
157	10.40.2.112/30	10.40.2.113 – 10.40.2.114	10.40.2.115
158	10.40.2.116/30	10.40.2.117 – 10.40.2.118	10.40.2.119
159	10.40.2.120/30	10.40.2.121 – 10.40.2.122	10.40.2.123
160	10.40.2.124/30	10.40.2.125 – 10.40.2.126	10.40.2.127
161	10.40.2.128/30	10.40.2.129 – 10.40.2.130	10.40.2.131
162	10.40.2.132/30	10.40.2.133 – 10.40.2.134	10.40.2.135
163	10.40.2.136/30	10.40.2.137 – 10.40.2.138	10.40.2.139
164	10.40.2.140/30	10.40.2.141 – 10.40.2.142	10.40.2.143
165	10.40.2.144/30	10.40.2.145 – 10.40.2.146	10.40.2.147
166	10.40.2.148/30	10.40.2.149 – 10.40.2.150	10.40.2.151
167	10.40.2.152/30	10.40.2.153 – 10.40.2.154	10.40.2.155
168	10.40.2.156/30	10.40.2.157 – 10.40.2.158	10.40.2.159
169	10.40.2.160/30	10.40.2.161 – 10.40.2.162	10.40.2.163
170	10.40.2.164/30	10.40.2.165 – 10.40.2.166	10.40.2.167
171	10.40.2.168/30	10.40.2.169 – 10.40.2.170	10.40.2.171
172	10.40.2.172/30	10.40.2.173 – 10.40.2.174	10.40.2.175
173	10.40.2.176/30	10.40.2.177 – 10.40.2.178	10.40.2.179
174	10.40.2.180/30	10.40.2.181 – 10.40.2.182	10.40.2.183
175	10.40.2.184/30	10.40.2.185 – 10.40.2.186	10.40.2.187
176	10.40.2.188/30	10.40.2.189 – 10.40.2.190	10.40.2.191
177	10.40.2.192/30	10.40.2.193 – 10.40.2.194	10.40.2.195
178	10.40.2.196/30	10.40.2.197 – 10.40.2.198	10.40.2.199
179	10.40.2.200/30	10.40.2.201 – 10.40.2.202	10.40.2.203
180	10.40.2.204/30	10.40.2.205 – 10.40.2.206	10.40.2.207
181	10.40.2.208/30	10.40.2.209 – 10.40.2.210	10.40.2.211
182	10.40.2.212/30	10.40.2.213 – 10.40.2.214	10.40.2.215
183	10.40.2.216/30	10.40.2.217 – 10.40.2.218	10.40.2.219
184	10.40.2.220/30	10.40.2.221 – 10.40.2.222	10.40.2.223
185	10.40.2.224/30	10.40.2.225 – 10.40.2.226	10.40.2.227
186	10.40.2.228/30	10.40.2.229 – 10.40.2.230	10.40.2.231
187	10.40.2.232/30	10.40.2.233 – 10.40.2.234	10.40.2.235
188	10.40.2.236/30	10.40.2.237 – 10.40.2.238	10.40.2.239
189	10.40.2.240/30	10.40.2.241 – 10.40.2.242	10.40.2.243
190	10.40.2.244/30	10.40.2.245 – 10.40.2.246	10.40.2.247
191	10.40.2.248/30	10.40.2.249 – 10.40.2.250	10.40.2.251
192	10.40.2.252/30	10.40.2.253 – 10.40.2.254	10.40.2.255
193	10.40.3.0/30	10.40.3.1 – 10.40.3.2	10.40.3.3
194	10.40.3.4/30	10.40.3.5 – 10.40.3.6	10.40.3.7
195	10.40.3.8/30	10.40.3.9 – 10.40.3.10	10.40.3.11
196	10.40.3.12/30	10.40.3.13 – 10.40.3.14	10.40.3.15
197	10.40.3.16/30	10.40.3.17 – 10.40.3.18	10.40.3.19
198	10.40.3.20/30	10.40.3.21 – 10.40.3.22	10.40.3.23
199	10.40.3.24/30	10.40.3.25 – 10.40.3.26	10.40.3.27
200	10.40.3.28/30	10.40.3.29 – 10.40.3.30	10.40.3.31
201	10.40.3.32/30	10.40.3.33 – 10.40.3.34	10.40.3.35
202	10.40.3.36/30	10.40.3.37 – 10.40.3.38	10.40.3.39
203	10.40.3.40/30	10.40.3.41 – 10.40.3.42	10.40.3.43
204	10.40.3.44/30	10.40.3.45 – 10.40.3.46	10.40.3.47
205	10.40.3.48/30	10.40.3.49 – 10.40.3.50	10.40.3.51
206	10.40.3.52/30	10.40.3.53 – 10.40.3.54	10.40.3.55
207	10.40.3.56/30	10.40.3.57 – 10.40.3.58	10.40.3.59
208	10.40.3.60/30	10.40.3.61 – 10.40.3.62	10.40.3.63
209	10.40.3.64/30	10.40.3.65 – 10.40.3.66	10.40.3.67
210	10.40.3.68/30	10.40.3.69 – 10.40.3.70	10.40.3.71
211	10.40.3.72/30	10.40.3.73 – 10.40.3.74	10.40.3.75
212	10.40.3.76/30	10.40.3.77 – 10.40.3.78	10.40.3.79
213	10.40.3.80/30	10.40.3.81 – 10.40.3.82	10.40.3.83
214	10.40.3.84/30	10.40.3.85 – 10.40.3.86	10.40.3.87
215	10.40.3.88/30	10.40.3.89 – 10.40.3.90	10.40.3.91
216	10.40.3.92/30	10.40.3.93 – 10.40.3.94	10.40.3.95
217	10.40.3.96/30	10.40.3.97 – 10.40.3.98	10.40.3.99
218	10.40.3.100/30	10.40.3.101 – 10.40.3.102	10.40.3.103
219	10.40.3.104/30	10.40.3.105 – 10.40.3.106	10.40.3.107
220	10.40.3.108/30	10.40.3.109 – 10.40.3.110	10.40.3.111
221	10.40.3.112/30	10.40.3.113 – 10.40.3.114	10.40.3.115
222	10.40.3.116/30	10.40.3.117 – 10.40.3.118	10.40.3.119
223	10.40.3.120/30	10.40.3.121 – 10.40.3.122	10.40.3.123
224	10.40.3.124/30	10.40.3.125 – 10.40.3.126	10.40.3.127
225	10.40.3.128/30	10.40.3.129 – 10.40.3.130	10.40.3.131
226	10.40.3.132/30	10.40.3.133 – 10.40.3.134	10.40.3.135
227	10.40.3.136/30	10.40.3.137 – 10.40.3.138	10.40.3.139
228	10.40.3.140/30	10.40.3.141 – 10.40.3.142	10.40.3.143
229	10.40.3.144/30	10.40.3.145 – 10.40.3.146	10.40.3.147
230	10.40.3.148/30	10.40.3.149 – 10.40.3.150	10.40.3.151
231	10.40.3.152/30	10.40.3.153 – 10.40.3.154	10.40.3.155
232	10.40.3.156/30	10.40.3.157 – 10.40.3.158	10.40.3.159
233	10.40.3.160/30	10.40.3.161 – 10.40.3.162	10.40.3.163
234	10.40.3.164/30	10.40.3.165 – 10.40.3.166	10.40.3.167
235	10.40.3.168/30	10.40.3.169 – 10.40.3.170	10.40.3.171
236	10.40.3.172/30	10.40.3.173 – 10.40.3.174	10.40.3.175
237	10.40.3.176/30	10.40.3.177 – 10.40.3.178	10.40.3.179
238	10.40.3.180/30	10.40.3.181 – 10.40.3.182	10.40.3.183
239	10.40.3.184/30	10.40.3.185 – 10.40.3.186	10.40.3.187
240	10.40.3.188/30	10.40.3.189 – 10.40.3.190	10.40.3.191
241	10.40.3.192/30	10.40.3.193 – 10.40.3.194	10.40.3.195
242	10.40.3.196/30	10.40.3.197 – 10.40.3.198	10.40.3.199
243	10.40.3.200/30	10.40.3.201 – 10.40.3.202	10.40.3.203
244	10.40.3.204/30	10.40.3.205 – 10.40.3.206	10.40.3.207
245	10.40.3.208/30	10.40.3.209 – 10.40.3.210	10.40.3.211
246	10.40.3.212/30	10.40.3.213 – 10.40.3.214	10.40.3.215
247	10.40.3.216/30	10.40.3.217 – 10.40.3.218	10.40.3.219
248	10.40.3.220/30	10.40.3.221 – 10.40.3.222	10.40.3.223
249	10.40.3.224/30	10.40.3.225 – 10.40.3.226	10.40.3.227
250	10.40.3.228/30	10.40.3.229 – 10.40.3.230	10.40.3.231
251	10.40.3.232/30	10.40.3.233 – 10.40.3.234	10.40.3.235
252	10.40.3.236/30	10.40.3.237 – 10.40.3.238	10.40.3.239
253	10.40.3.240/30	10.40.3.241 – 10.40.3.242	10.40.3.243
254	10.40.3.244/30	10.40.3.245 – 10.40.3.246	10.40.3.247
255	10.40.3.248/30	10.40.3.249 – 10.40.3.250	10.40.3.251
256	10.40.3.252/30	10.40.3.253 – 10.40.3.254	10.40.3.255

showing 256 of 4,096

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 /18
/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	1
/19	255.255.224.0	8,192	8,190	2 split →
/20	255.255.240.0	4,096	4,094	4 split →
/21	255.255.248.0	2,048	2,046	8 split →
/22	255.255.252.0	1,024	1,022	16 split →
/23	255.255.254.0	512	510	32 split →
/24	255.255.255.0	256	254	64 split →
/25	255.255.255.128	128	126	128 split →
/26	255.255.255.192	64	62	256 split →
/27	255.255.255.224	32	30	512 split →
/28	255.255.255.240	16	14	1,024 split →
/29	255.255.255.248	8	6	2,048 split →
/30	255.255.255.252	4	2	4,096 split →
/31	255.255.255.254	2	2	8,192 split →
/32	255.255.255.255	1	1	16,384 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 →