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)10.40.128.0/18

network10.40.128.0/18

broadcast10.40.191.255

first host10.40.128.1

last host10.40.191.254

subnet mask255.255.192.0

wildcard0.0.63.255

addresses16,384

usable hosts16,382

classA

ipcalc 10.40.128.0/18

address00001010.00101000.10000000.00000000

subnet mask11111111.11111111.11000000.00000000

network00001010.00101000.10000000.00000000

broadcast00001010.00101000.10111111.11111111

green = network part, grey = host part

hex0x0a288000

decimal170426368

reverse dns0.128.40.10.in-addr.arpa

ipv4-mapped::ffff:a28:8000

/18 split into /30 · 4,096 subnets

close ×

#	network	host range	broadcast
1	10.40.128.0/30	10.40.128.1 – 10.40.128.2	10.40.128.3
2	10.40.128.4/30	10.40.128.5 – 10.40.128.6	10.40.128.7
3	10.40.128.8/30	10.40.128.9 – 10.40.128.10	10.40.128.11
4	10.40.128.12/30	10.40.128.13 – 10.40.128.14	10.40.128.15
5	10.40.128.16/30	10.40.128.17 – 10.40.128.18	10.40.128.19
6	10.40.128.20/30	10.40.128.21 – 10.40.128.22	10.40.128.23
7	10.40.128.24/30	10.40.128.25 – 10.40.128.26	10.40.128.27
8	10.40.128.28/30	10.40.128.29 – 10.40.128.30	10.40.128.31
9	10.40.128.32/30	10.40.128.33 – 10.40.128.34	10.40.128.35
10	10.40.128.36/30	10.40.128.37 – 10.40.128.38	10.40.128.39
11	10.40.128.40/30	10.40.128.41 – 10.40.128.42	10.40.128.43
12	10.40.128.44/30	10.40.128.45 – 10.40.128.46	10.40.128.47
13	10.40.128.48/30	10.40.128.49 – 10.40.128.50	10.40.128.51
14	10.40.128.52/30	10.40.128.53 – 10.40.128.54	10.40.128.55
15	10.40.128.56/30	10.40.128.57 – 10.40.128.58	10.40.128.59
16	10.40.128.60/30	10.40.128.61 – 10.40.128.62	10.40.128.63
17	10.40.128.64/30	10.40.128.65 – 10.40.128.66	10.40.128.67
18	10.40.128.68/30	10.40.128.69 – 10.40.128.70	10.40.128.71
19	10.40.128.72/30	10.40.128.73 – 10.40.128.74	10.40.128.75
20	10.40.128.76/30	10.40.128.77 – 10.40.128.78	10.40.128.79
21	10.40.128.80/30	10.40.128.81 – 10.40.128.82	10.40.128.83
22	10.40.128.84/30	10.40.128.85 – 10.40.128.86	10.40.128.87
23	10.40.128.88/30	10.40.128.89 – 10.40.128.90	10.40.128.91
24	10.40.128.92/30	10.40.128.93 – 10.40.128.94	10.40.128.95
25	10.40.128.96/30	10.40.128.97 – 10.40.128.98	10.40.128.99
26	10.40.128.100/30	10.40.128.101 – 10.40.128.102	10.40.128.103
27	10.40.128.104/30	10.40.128.105 – 10.40.128.106	10.40.128.107
28	10.40.128.108/30	10.40.128.109 – 10.40.128.110	10.40.128.111
29	10.40.128.112/30	10.40.128.113 – 10.40.128.114	10.40.128.115
30	10.40.128.116/30	10.40.128.117 – 10.40.128.118	10.40.128.119
31	10.40.128.120/30	10.40.128.121 – 10.40.128.122	10.40.128.123
32	10.40.128.124/30	10.40.128.125 – 10.40.128.126	10.40.128.127
33	10.40.128.128/30	10.40.128.129 – 10.40.128.130	10.40.128.131
34	10.40.128.132/30	10.40.128.133 – 10.40.128.134	10.40.128.135
35	10.40.128.136/30	10.40.128.137 – 10.40.128.138	10.40.128.139
36	10.40.128.140/30	10.40.128.141 – 10.40.128.142	10.40.128.143
37	10.40.128.144/30	10.40.128.145 – 10.40.128.146	10.40.128.147
38	10.40.128.148/30	10.40.128.149 – 10.40.128.150	10.40.128.151
39	10.40.128.152/30	10.40.128.153 – 10.40.128.154	10.40.128.155
40	10.40.128.156/30	10.40.128.157 – 10.40.128.158	10.40.128.159
41	10.40.128.160/30	10.40.128.161 – 10.40.128.162	10.40.128.163
42	10.40.128.164/30	10.40.128.165 – 10.40.128.166	10.40.128.167
43	10.40.128.168/30	10.40.128.169 – 10.40.128.170	10.40.128.171
44	10.40.128.172/30	10.40.128.173 – 10.40.128.174	10.40.128.175
45	10.40.128.176/30	10.40.128.177 – 10.40.128.178	10.40.128.179
46	10.40.128.180/30	10.40.128.181 – 10.40.128.182	10.40.128.183
47	10.40.128.184/30	10.40.128.185 – 10.40.128.186	10.40.128.187
48	10.40.128.188/30	10.40.128.189 – 10.40.128.190	10.40.128.191
49	10.40.128.192/30	10.40.128.193 – 10.40.128.194	10.40.128.195
50	10.40.128.196/30	10.40.128.197 – 10.40.128.198	10.40.128.199
51	10.40.128.200/30	10.40.128.201 – 10.40.128.202	10.40.128.203
52	10.40.128.204/30	10.40.128.205 – 10.40.128.206	10.40.128.207
53	10.40.128.208/30	10.40.128.209 – 10.40.128.210	10.40.128.211
54	10.40.128.212/30	10.40.128.213 – 10.40.128.214	10.40.128.215
55	10.40.128.216/30	10.40.128.217 – 10.40.128.218	10.40.128.219
56	10.40.128.220/30	10.40.128.221 – 10.40.128.222	10.40.128.223
57	10.40.128.224/30	10.40.128.225 – 10.40.128.226	10.40.128.227
58	10.40.128.228/30	10.40.128.229 – 10.40.128.230	10.40.128.231
59	10.40.128.232/30	10.40.128.233 – 10.40.128.234	10.40.128.235
60	10.40.128.236/30	10.40.128.237 – 10.40.128.238	10.40.128.239
61	10.40.128.240/30	10.40.128.241 – 10.40.128.242	10.40.128.243
62	10.40.128.244/30	10.40.128.245 – 10.40.128.246	10.40.128.247
63	10.40.128.248/30	10.40.128.249 – 10.40.128.250	10.40.128.251
64	10.40.128.252/30	10.40.128.253 – 10.40.128.254	10.40.128.255
65	10.40.129.0/30	10.40.129.1 – 10.40.129.2	10.40.129.3
66	10.40.129.4/30	10.40.129.5 – 10.40.129.6	10.40.129.7
67	10.40.129.8/30	10.40.129.9 – 10.40.129.10	10.40.129.11
68	10.40.129.12/30	10.40.129.13 – 10.40.129.14	10.40.129.15
69	10.40.129.16/30	10.40.129.17 – 10.40.129.18	10.40.129.19
70	10.40.129.20/30	10.40.129.21 – 10.40.129.22	10.40.129.23
71	10.40.129.24/30	10.40.129.25 – 10.40.129.26	10.40.129.27
72	10.40.129.28/30	10.40.129.29 – 10.40.129.30	10.40.129.31
73	10.40.129.32/30	10.40.129.33 – 10.40.129.34	10.40.129.35
74	10.40.129.36/30	10.40.129.37 – 10.40.129.38	10.40.129.39
75	10.40.129.40/30	10.40.129.41 – 10.40.129.42	10.40.129.43
76	10.40.129.44/30	10.40.129.45 – 10.40.129.46	10.40.129.47
77	10.40.129.48/30	10.40.129.49 – 10.40.129.50	10.40.129.51
78	10.40.129.52/30	10.40.129.53 – 10.40.129.54	10.40.129.55
79	10.40.129.56/30	10.40.129.57 – 10.40.129.58	10.40.129.59
80	10.40.129.60/30	10.40.129.61 – 10.40.129.62	10.40.129.63
81	10.40.129.64/30	10.40.129.65 – 10.40.129.66	10.40.129.67
82	10.40.129.68/30	10.40.129.69 – 10.40.129.70	10.40.129.71
83	10.40.129.72/30	10.40.129.73 – 10.40.129.74	10.40.129.75
84	10.40.129.76/30	10.40.129.77 – 10.40.129.78	10.40.129.79
85	10.40.129.80/30	10.40.129.81 – 10.40.129.82	10.40.129.83
86	10.40.129.84/30	10.40.129.85 – 10.40.129.86	10.40.129.87
87	10.40.129.88/30	10.40.129.89 – 10.40.129.90	10.40.129.91
88	10.40.129.92/30	10.40.129.93 – 10.40.129.94	10.40.129.95
89	10.40.129.96/30	10.40.129.97 – 10.40.129.98	10.40.129.99
90	10.40.129.100/30	10.40.129.101 – 10.40.129.102	10.40.129.103
91	10.40.129.104/30	10.40.129.105 – 10.40.129.106	10.40.129.107
92	10.40.129.108/30	10.40.129.109 – 10.40.129.110	10.40.129.111
93	10.40.129.112/30	10.40.129.113 – 10.40.129.114	10.40.129.115
94	10.40.129.116/30	10.40.129.117 – 10.40.129.118	10.40.129.119
95	10.40.129.120/30	10.40.129.121 – 10.40.129.122	10.40.129.123
96	10.40.129.124/30	10.40.129.125 – 10.40.129.126	10.40.129.127
97	10.40.129.128/30	10.40.129.129 – 10.40.129.130	10.40.129.131
98	10.40.129.132/30	10.40.129.133 – 10.40.129.134	10.40.129.135
99	10.40.129.136/30	10.40.129.137 – 10.40.129.138	10.40.129.139
100	10.40.129.140/30	10.40.129.141 – 10.40.129.142	10.40.129.143
101	10.40.129.144/30	10.40.129.145 – 10.40.129.146	10.40.129.147
102	10.40.129.148/30	10.40.129.149 – 10.40.129.150	10.40.129.151
103	10.40.129.152/30	10.40.129.153 – 10.40.129.154	10.40.129.155
104	10.40.129.156/30	10.40.129.157 – 10.40.129.158	10.40.129.159
105	10.40.129.160/30	10.40.129.161 – 10.40.129.162	10.40.129.163
106	10.40.129.164/30	10.40.129.165 – 10.40.129.166	10.40.129.167
107	10.40.129.168/30	10.40.129.169 – 10.40.129.170	10.40.129.171
108	10.40.129.172/30	10.40.129.173 – 10.40.129.174	10.40.129.175
109	10.40.129.176/30	10.40.129.177 – 10.40.129.178	10.40.129.179
110	10.40.129.180/30	10.40.129.181 – 10.40.129.182	10.40.129.183
111	10.40.129.184/30	10.40.129.185 – 10.40.129.186	10.40.129.187
112	10.40.129.188/30	10.40.129.189 – 10.40.129.190	10.40.129.191
113	10.40.129.192/30	10.40.129.193 – 10.40.129.194	10.40.129.195
114	10.40.129.196/30	10.40.129.197 – 10.40.129.198	10.40.129.199
115	10.40.129.200/30	10.40.129.201 – 10.40.129.202	10.40.129.203
116	10.40.129.204/30	10.40.129.205 – 10.40.129.206	10.40.129.207
117	10.40.129.208/30	10.40.129.209 – 10.40.129.210	10.40.129.211
118	10.40.129.212/30	10.40.129.213 – 10.40.129.214	10.40.129.215
119	10.40.129.216/30	10.40.129.217 – 10.40.129.218	10.40.129.219
120	10.40.129.220/30	10.40.129.221 – 10.40.129.222	10.40.129.223
121	10.40.129.224/30	10.40.129.225 – 10.40.129.226	10.40.129.227
122	10.40.129.228/30	10.40.129.229 – 10.40.129.230	10.40.129.231
123	10.40.129.232/30	10.40.129.233 – 10.40.129.234	10.40.129.235
124	10.40.129.236/30	10.40.129.237 – 10.40.129.238	10.40.129.239
125	10.40.129.240/30	10.40.129.241 – 10.40.129.242	10.40.129.243
126	10.40.129.244/30	10.40.129.245 – 10.40.129.246	10.40.129.247
127	10.40.129.248/30	10.40.129.249 – 10.40.129.250	10.40.129.251
128	10.40.129.252/30	10.40.129.253 – 10.40.129.254	10.40.129.255
129	10.40.130.0/30	10.40.130.1 – 10.40.130.2	10.40.130.3
130	10.40.130.4/30	10.40.130.5 – 10.40.130.6	10.40.130.7
131	10.40.130.8/30	10.40.130.9 – 10.40.130.10	10.40.130.11
132	10.40.130.12/30	10.40.130.13 – 10.40.130.14	10.40.130.15
133	10.40.130.16/30	10.40.130.17 – 10.40.130.18	10.40.130.19
134	10.40.130.20/30	10.40.130.21 – 10.40.130.22	10.40.130.23
135	10.40.130.24/30	10.40.130.25 – 10.40.130.26	10.40.130.27
136	10.40.130.28/30	10.40.130.29 – 10.40.130.30	10.40.130.31
137	10.40.130.32/30	10.40.130.33 – 10.40.130.34	10.40.130.35
138	10.40.130.36/30	10.40.130.37 – 10.40.130.38	10.40.130.39
139	10.40.130.40/30	10.40.130.41 – 10.40.130.42	10.40.130.43
140	10.40.130.44/30	10.40.130.45 – 10.40.130.46	10.40.130.47
141	10.40.130.48/30	10.40.130.49 – 10.40.130.50	10.40.130.51
142	10.40.130.52/30	10.40.130.53 – 10.40.130.54	10.40.130.55
143	10.40.130.56/30	10.40.130.57 – 10.40.130.58	10.40.130.59
144	10.40.130.60/30	10.40.130.61 – 10.40.130.62	10.40.130.63
145	10.40.130.64/30	10.40.130.65 – 10.40.130.66	10.40.130.67
146	10.40.130.68/30	10.40.130.69 – 10.40.130.70	10.40.130.71
147	10.40.130.72/30	10.40.130.73 – 10.40.130.74	10.40.130.75
148	10.40.130.76/30	10.40.130.77 – 10.40.130.78	10.40.130.79
149	10.40.130.80/30	10.40.130.81 – 10.40.130.82	10.40.130.83
150	10.40.130.84/30	10.40.130.85 – 10.40.130.86	10.40.130.87
151	10.40.130.88/30	10.40.130.89 – 10.40.130.90	10.40.130.91
152	10.40.130.92/30	10.40.130.93 – 10.40.130.94	10.40.130.95
153	10.40.130.96/30	10.40.130.97 – 10.40.130.98	10.40.130.99
154	10.40.130.100/30	10.40.130.101 – 10.40.130.102	10.40.130.103
155	10.40.130.104/30	10.40.130.105 – 10.40.130.106	10.40.130.107
156	10.40.130.108/30	10.40.130.109 – 10.40.130.110	10.40.130.111
157	10.40.130.112/30	10.40.130.113 – 10.40.130.114	10.40.130.115
158	10.40.130.116/30	10.40.130.117 – 10.40.130.118	10.40.130.119
159	10.40.130.120/30	10.40.130.121 – 10.40.130.122	10.40.130.123
160	10.40.130.124/30	10.40.130.125 – 10.40.130.126	10.40.130.127
161	10.40.130.128/30	10.40.130.129 – 10.40.130.130	10.40.130.131
162	10.40.130.132/30	10.40.130.133 – 10.40.130.134	10.40.130.135
163	10.40.130.136/30	10.40.130.137 – 10.40.130.138	10.40.130.139
164	10.40.130.140/30	10.40.130.141 – 10.40.130.142	10.40.130.143
165	10.40.130.144/30	10.40.130.145 – 10.40.130.146	10.40.130.147
166	10.40.130.148/30	10.40.130.149 – 10.40.130.150	10.40.130.151
167	10.40.130.152/30	10.40.130.153 – 10.40.130.154	10.40.130.155
168	10.40.130.156/30	10.40.130.157 – 10.40.130.158	10.40.130.159
169	10.40.130.160/30	10.40.130.161 – 10.40.130.162	10.40.130.163
170	10.40.130.164/30	10.40.130.165 – 10.40.130.166	10.40.130.167
171	10.40.130.168/30	10.40.130.169 – 10.40.130.170	10.40.130.171
172	10.40.130.172/30	10.40.130.173 – 10.40.130.174	10.40.130.175
173	10.40.130.176/30	10.40.130.177 – 10.40.130.178	10.40.130.179
174	10.40.130.180/30	10.40.130.181 – 10.40.130.182	10.40.130.183
175	10.40.130.184/30	10.40.130.185 – 10.40.130.186	10.40.130.187
176	10.40.130.188/30	10.40.130.189 – 10.40.130.190	10.40.130.191
177	10.40.130.192/30	10.40.130.193 – 10.40.130.194	10.40.130.195
178	10.40.130.196/30	10.40.130.197 – 10.40.130.198	10.40.130.199
179	10.40.130.200/30	10.40.130.201 – 10.40.130.202	10.40.130.203
180	10.40.130.204/30	10.40.130.205 – 10.40.130.206	10.40.130.207
181	10.40.130.208/30	10.40.130.209 – 10.40.130.210	10.40.130.211
182	10.40.130.212/30	10.40.130.213 – 10.40.130.214	10.40.130.215
183	10.40.130.216/30	10.40.130.217 – 10.40.130.218	10.40.130.219
184	10.40.130.220/30	10.40.130.221 – 10.40.130.222	10.40.130.223
185	10.40.130.224/30	10.40.130.225 – 10.40.130.226	10.40.130.227
186	10.40.130.228/30	10.40.130.229 – 10.40.130.230	10.40.130.231
187	10.40.130.232/30	10.40.130.233 – 10.40.130.234	10.40.130.235
188	10.40.130.236/30	10.40.130.237 – 10.40.130.238	10.40.130.239
189	10.40.130.240/30	10.40.130.241 – 10.40.130.242	10.40.130.243
190	10.40.130.244/30	10.40.130.245 – 10.40.130.246	10.40.130.247
191	10.40.130.248/30	10.40.130.249 – 10.40.130.250	10.40.130.251
192	10.40.130.252/30	10.40.130.253 – 10.40.130.254	10.40.130.255
193	10.40.131.0/30	10.40.131.1 – 10.40.131.2	10.40.131.3
194	10.40.131.4/30	10.40.131.5 – 10.40.131.6	10.40.131.7
195	10.40.131.8/30	10.40.131.9 – 10.40.131.10	10.40.131.11
196	10.40.131.12/30	10.40.131.13 – 10.40.131.14	10.40.131.15
197	10.40.131.16/30	10.40.131.17 – 10.40.131.18	10.40.131.19
198	10.40.131.20/30	10.40.131.21 – 10.40.131.22	10.40.131.23
199	10.40.131.24/30	10.40.131.25 – 10.40.131.26	10.40.131.27
200	10.40.131.28/30	10.40.131.29 – 10.40.131.30	10.40.131.31
201	10.40.131.32/30	10.40.131.33 – 10.40.131.34	10.40.131.35
202	10.40.131.36/30	10.40.131.37 – 10.40.131.38	10.40.131.39
203	10.40.131.40/30	10.40.131.41 – 10.40.131.42	10.40.131.43
204	10.40.131.44/30	10.40.131.45 – 10.40.131.46	10.40.131.47
205	10.40.131.48/30	10.40.131.49 – 10.40.131.50	10.40.131.51
206	10.40.131.52/30	10.40.131.53 – 10.40.131.54	10.40.131.55
207	10.40.131.56/30	10.40.131.57 – 10.40.131.58	10.40.131.59
208	10.40.131.60/30	10.40.131.61 – 10.40.131.62	10.40.131.63
209	10.40.131.64/30	10.40.131.65 – 10.40.131.66	10.40.131.67
210	10.40.131.68/30	10.40.131.69 – 10.40.131.70	10.40.131.71
211	10.40.131.72/30	10.40.131.73 – 10.40.131.74	10.40.131.75
212	10.40.131.76/30	10.40.131.77 – 10.40.131.78	10.40.131.79
213	10.40.131.80/30	10.40.131.81 – 10.40.131.82	10.40.131.83
214	10.40.131.84/30	10.40.131.85 – 10.40.131.86	10.40.131.87
215	10.40.131.88/30	10.40.131.89 – 10.40.131.90	10.40.131.91
216	10.40.131.92/30	10.40.131.93 – 10.40.131.94	10.40.131.95
217	10.40.131.96/30	10.40.131.97 – 10.40.131.98	10.40.131.99
218	10.40.131.100/30	10.40.131.101 – 10.40.131.102	10.40.131.103
219	10.40.131.104/30	10.40.131.105 – 10.40.131.106	10.40.131.107
220	10.40.131.108/30	10.40.131.109 – 10.40.131.110	10.40.131.111
221	10.40.131.112/30	10.40.131.113 – 10.40.131.114	10.40.131.115
222	10.40.131.116/30	10.40.131.117 – 10.40.131.118	10.40.131.119
223	10.40.131.120/30	10.40.131.121 – 10.40.131.122	10.40.131.123
224	10.40.131.124/30	10.40.131.125 – 10.40.131.126	10.40.131.127
225	10.40.131.128/30	10.40.131.129 – 10.40.131.130	10.40.131.131
226	10.40.131.132/30	10.40.131.133 – 10.40.131.134	10.40.131.135
227	10.40.131.136/30	10.40.131.137 – 10.40.131.138	10.40.131.139
228	10.40.131.140/30	10.40.131.141 – 10.40.131.142	10.40.131.143
229	10.40.131.144/30	10.40.131.145 – 10.40.131.146	10.40.131.147
230	10.40.131.148/30	10.40.131.149 – 10.40.131.150	10.40.131.151
231	10.40.131.152/30	10.40.131.153 – 10.40.131.154	10.40.131.155
232	10.40.131.156/30	10.40.131.157 – 10.40.131.158	10.40.131.159
233	10.40.131.160/30	10.40.131.161 – 10.40.131.162	10.40.131.163
234	10.40.131.164/30	10.40.131.165 – 10.40.131.166	10.40.131.167
235	10.40.131.168/30	10.40.131.169 – 10.40.131.170	10.40.131.171
236	10.40.131.172/30	10.40.131.173 – 10.40.131.174	10.40.131.175
237	10.40.131.176/30	10.40.131.177 – 10.40.131.178	10.40.131.179
238	10.40.131.180/30	10.40.131.181 – 10.40.131.182	10.40.131.183
239	10.40.131.184/30	10.40.131.185 – 10.40.131.186	10.40.131.187
240	10.40.131.188/30	10.40.131.189 – 10.40.131.190	10.40.131.191
241	10.40.131.192/30	10.40.131.193 – 10.40.131.194	10.40.131.195
242	10.40.131.196/30	10.40.131.197 – 10.40.131.198	10.40.131.199
243	10.40.131.200/30	10.40.131.201 – 10.40.131.202	10.40.131.203
244	10.40.131.204/30	10.40.131.205 – 10.40.131.206	10.40.131.207
245	10.40.131.208/30	10.40.131.209 – 10.40.131.210	10.40.131.211
246	10.40.131.212/30	10.40.131.213 – 10.40.131.214	10.40.131.215
247	10.40.131.216/30	10.40.131.217 – 10.40.131.218	10.40.131.219
248	10.40.131.220/30	10.40.131.221 – 10.40.131.222	10.40.131.223
249	10.40.131.224/30	10.40.131.225 – 10.40.131.226	10.40.131.227
250	10.40.131.228/30	10.40.131.229 – 10.40.131.230	10.40.131.231
251	10.40.131.232/30	10.40.131.233 – 10.40.131.234	10.40.131.235
252	10.40.131.236/30	10.40.131.237 – 10.40.131.238	10.40.131.239
253	10.40.131.240/30	10.40.131.241 – 10.40.131.242	10.40.131.243
254	10.40.131.244/30	10.40.131.245 – 10.40.131.246	10.40.131.247
255	10.40.131.248/30	10.40.131.249 – 10.40.131.250	10.40.131.251
256	10.40.131.252/30	10.40.131.253 – 10.40.131.254	10.40.131.255

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 →