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)10.240.0.0/12

network10.240.0.0/12

broadcast10.255.255.255

first host10.240.0.1

last host10.255.255.254

subnet mask255.240.0.0

wildcard0.15.255.255

addresses1,048,576

usable hosts1,048,574

classA

ipcalc 10.240.0.0/12

address00001010.11110000.00000000.00000000

subnet mask11111111.11110000.00000000.00000000

network00001010.11110000.00000000.00000000

broadcast00001010.11111111.11111111.11111111

green = network part, grey = host part

hex0x0af00000

decimal183500800

reverse dns0.0.240.10.in-addr.arpa

ipv4-mapped::ffff:af0:0

/12 split into /29 · 131,072 subnets

close ×

#	network	host range	broadcast
1	10.240.0.0/29	10.240.0.1 – 10.240.0.6	10.240.0.7
2	10.240.0.8/29	10.240.0.9 – 10.240.0.14	10.240.0.15
3	10.240.0.16/29	10.240.0.17 – 10.240.0.22	10.240.0.23
4	10.240.0.24/29	10.240.0.25 – 10.240.0.30	10.240.0.31
5	10.240.0.32/29	10.240.0.33 – 10.240.0.38	10.240.0.39
6	10.240.0.40/29	10.240.0.41 – 10.240.0.46	10.240.0.47
7	10.240.0.48/29	10.240.0.49 – 10.240.0.54	10.240.0.55
8	10.240.0.56/29	10.240.0.57 – 10.240.0.62	10.240.0.63
9	10.240.0.64/29	10.240.0.65 – 10.240.0.70	10.240.0.71
10	10.240.0.72/29	10.240.0.73 – 10.240.0.78	10.240.0.79
11	10.240.0.80/29	10.240.0.81 – 10.240.0.86	10.240.0.87
12	10.240.0.88/29	10.240.0.89 – 10.240.0.94	10.240.0.95
13	10.240.0.96/29	10.240.0.97 – 10.240.0.102	10.240.0.103
14	10.240.0.104/29	10.240.0.105 – 10.240.0.110	10.240.0.111
15	10.240.0.112/29	10.240.0.113 – 10.240.0.118	10.240.0.119
16	10.240.0.120/29	10.240.0.121 – 10.240.0.126	10.240.0.127
17	10.240.0.128/29	10.240.0.129 – 10.240.0.134	10.240.0.135
18	10.240.0.136/29	10.240.0.137 – 10.240.0.142	10.240.0.143
19	10.240.0.144/29	10.240.0.145 – 10.240.0.150	10.240.0.151
20	10.240.0.152/29	10.240.0.153 – 10.240.0.158	10.240.0.159
21	10.240.0.160/29	10.240.0.161 – 10.240.0.166	10.240.0.167
22	10.240.0.168/29	10.240.0.169 – 10.240.0.174	10.240.0.175
23	10.240.0.176/29	10.240.0.177 – 10.240.0.182	10.240.0.183
24	10.240.0.184/29	10.240.0.185 – 10.240.0.190	10.240.0.191
25	10.240.0.192/29	10.240.0.193 – 10.240.0.198	10.240.0.199
26	10.240.0.200/29	10.240.0.201 – 10.240.0.206	10.240.0.207
27	10.240.0.208/29	10.240.0.209 – 10.240.0.214	10.240.0.215
28	10.240.0.216/29	10.240.0.217 – 10.240.0.222	10.240.0.223
29	10.240.0.224/29	10.240.0.225 – 10.240.0.230	10.240.0.231
30	10.240.0.232/29	10.240.0.233 – 10.240.0.238	10.240.0.239
31	10.240.0.240/29	10.240.0.241 – 10.240.0.246	10.240.0.247
32	10.240.0.248/29	10.240.0.249 – 10.240.0.254	10.240.0.255
33	10.240.1.0/29	10.240.1.1 – 10.240.1.6	10.240.1.7
34	10.240.1.8/29	10.240.1.9 – 10.240.1.14	10.240.1.15
35	10.240.1.16/29	10.240.1.17 – 10.240.1.22	10.240.1.23
36	10.240.1.24/29	10.240.1.25 – 10.240.1.30	10.240.1.31
37	10.240.1.32/29	10.240.1.33 – 10.240.1.38	10.240.1.39
38	10.240.1.40/29	10.240.1.41 – 10.240.1.46	10.240.1.47
39	10.240.1.48/29	10.240.1.49 – 10.240.1.54	10.240.1.55
40	10.240.1.56/29	10.240.1.57 – 10.240.1.62	10.240.1.63
41	10.240.1.64/29	10.240.1.65 – 10.240.1.70	10.240.1.71
42	10.240.1.72/29	10.240.1.73 – 10.240.1.78	10.240.1.79
43	10.240.1.80/29	10.240.1.81 – 10.240.1.86	10.240.1.87
44	10.240.1.88/29	10.240.1.89 – 10.240.1.94	10.240.1.95
45	10.240.1.96/29	10.240.1.97 – 10.240.1.102	10.240.1.103
46	10.240.1.104/29	10.240.1.105 – 10.240.1.110	10.240.1.111
47	10.240.1.112/29	10.240.1.113 – 10.240.1.118	10.240.1.119
48	10.240.1.120/29	10.240.1.121 – 10.240.1.126	10.240.1.127
49	10.240.1.128/29	10.240.1.129 – 10.240.1.134	10.240.1.135
50	10.240.1.136/29	10.240.1.137 – 10.240.1.142	10.240.1.143
51	10.240.1.144/29	10.240.1.145 – 10.240.1.150	10.240.1.151
52	10.240.1.152/29	10.240.1.153 – 10.240.1.158	10.240.1.159
53	10.240.1.160/29	10.240.1.161 – 10.240.1.166	10.240.1.167
54	10.240.1.168/29	10.240.1.169 – 10.240.1.174	10.240.1.175
55	10.240.1.176/29	10.240.1.177 – 10.240.1.182	10.240.1.183
56	10.240.1.184/29	10.240.1.185 – 10.240.1.190	10.240.1.191
57	10.240.1.192/29	10.240.1.193 – 10.240.1.198	10.240.1.199
58	10.240.1.200/29	10.240.1.201 – 10.240.1.206	10.240.1.207
59	10.240.1.208/29	10.240.1.209 – 10.240.1.214	10.240.1.215
60	10.240.1.216/29	10.240.1.217 – 10.240.1.222	10.240.1.223
61	10.240.1.224/29	10.240.1.225 – 10.240.1.230	10.240.1.231
62	10.240.1.232/29	10.240.1.233 – 10.240.1.238	10.240.1.239
63	10.240.1.240/29	10.240.1.241 – 10.240.1.246	10.240.1.247
64	10.240.1.248/29	10.240.1.249 – 10.240.1.254	10.240.1.255
65	10.240.2.0/29	10.240.2.1 – 10.240.2.6	10.240.2.7
66	10.240.2.8/29	10.240.2.9 – 10.240.2.14	10.240.2.15
67	10.240.2.16/29	10.240.2.17 – 10.240.2.22	10.240.2.23
68	10.240.2.24/29	10.240.2.25 – 10.240.2.30	10.240.2.31
69	10.240.2.32/29	10.240.2.33 – 10.240.2.38	10.240.2.39
70	10.240.2.40/29	10.240.2.41 – 10.240.2.46	10.240.2.47
71	10.240.2.48/29	10.240.2.49 – 10.240.2.54	10.240.2.55
72	10.240.2.56/29	10.240.2.57 – 10.240.2.62	10.240.2.63
73	10.240.2.64/29	10.240.2.65 – 10.240.2.70	10.240.2.71
74	10.240.2.72/29	10.240.2.73 – 10.240.2.78	10.240.2.79
75	10.240.2.80/29	10.240.2.81 – 10.240.2.86	10.240.2.87
76	10.240.2.88/29	10.240.2.89 – 10.240.2.94	10.240.2.95
77	10.240.2.96/29	10.240.2.97 – 10.240.2.102	10.240.2.103
78	10.240.2.104/29	10.240.2.105 – 10.240.2.110	10.240.2.111
79	10.240.2.112/29	10.240.2.113 – 10.240.2.118	10.240.2.119
80	10.240.2.120/29	10.240.2.121 – 10.240.2.126	10.240.2.127
81	10.240.2.128/29	10.240.2.129 – 10.240.2.134	10.240.2.135
82	10.240.2.136/29	10.240.2.137 – 10.240.2.142	10.240.2.143
83	10.240.2.144/29	10.240.2.145 – 10.240.2.150	10.240.2.151
84	10.240.2.152/29	10.240.2.153 – 10.240.2.158	10.240.2.159
85	10.240.2.160/29	10.240.2.161 – 10.240.2.166	10.240.2.167
86	10.240.2.168/29	10.240.2.169 – 10.240.2.174	10.240.2.175
87	10.240.2.176/29	10.240.2.177 – 10.240.2.182	10.240.2.183
88	10.240.2.184/29	10.240.2.185 – 10.240.2.190	10.240.2.191
89	10.240.2.192/29	10.240.2.193 – 10.240.2.198	10.240.2.199
90	10.240.2.200/29	10.240.2.201 – 10.240.2.206	10.240.2.207
91	10.240.2.208/29	10.240.2.209 – 10.240.2.214	10.240.2.215
92	10.240.2.216/29	10.240.2.217 – 10.240.2.222	10.240.2.223
93	10.240.2.224/29	10.240.2.225 – 10.240.2.230	10.240.2.231
94	10.240.2.232/29	10.240.2.233 – 10.240.2.238	10.240.2.239
95	10.240.2.240/29	10.240.2.241 – 10.240.2.246	10.240.2.247
96	10.240.2.248/29	10.240.2.249 – 10.240.2.254	10.240.2.255
97	10.240.3.0/29	10.240.3.1 – 10.240.3.6	10.240.3.7
98	10.240.3.8/29	10.240.3.9 – 10.240.3.14	10.240.3.15
99	10.240.3.16/29	10.240.3.17 – 10.240.3.22	10.240.3.23
100	10.240.3.24/29	10.240.3.25 – 10.240.3.30	10.240.3.31
101	10.240.3.32/29	10.240.3.33 – 10.240.3.38	10.240.3.39
102	10.240.3.40/29	10.240.3.41 – 10.240.3.46	10.240.3.47
103	10.240.3.48/29	10.240.3.49 – 10.240.3.54	10.240.3.55
104	10.240.3.56/29	10.240.3.57 – 10.240.3.62	10.240.3.63
105	10.240.3.64/29	10.240.3.65 – 10.240.3.70	10.240.3.71
106	10.240.3.72/29	10.240.3.73 – 10.240.3.78	10.240.3.79
107	10.240.3.80/29	10.240.3.81 – 10.240.3.86	10.240.3.87
108	10.240.3.88/29	10.240.3.89 – 10.240.3.94	10.240.3.95
109	10.240.3.96/29	10.240.3.97 – 10.240.3.102	10.240.3.103
110	10.240.3.104/29	10.240.3.105 – 10.240.3.110	10.240.3.111
111	10.240.3.112/29	10.240.3.113 – 10.240.3.118	10.240.3.119
112	10.240.3.120/29	10.240.3.121 – 10.240.3.126	10.240.3.127
113	10.240.3.128/29	10.240.3.129 – 10.240.3.134	10.240.3.135
114	10.240.3.136/29	10.240.3.137 – 10.240.3.142	10.240.3.143
115	10.240.3.144/29	10.240.3.145 – 10.240.3.150	10.240.3.151
116	10.240.3.152/29	10.240.3.153 – 10.240.3.158	10.240.3.159
117	10.240.3.160/29	10.240.3.161 – 10.240.3.166	10.240.3.167
118	10.240.3.168/29	10.240.3.169 – 10.240.3.174	10.240.3.175
119	10.240.3.176/29	10.240.3.177 – 10.240.3.182	10.240.3.183
120	10.240.3.184/29	10.240.3.185 – 10.240.3.190	10.240.3.191
121	10.240.3.192/29	10.240.3.193 – 10.240.3.198	10.240.3.199
122	10.240.3.200/29	10.240.3.201 – 10.240.3.206	10.240.3.207
123	10.240.3.208/29	10.240.3.209 – 10.240.3.214	10.240.3.215
124	10.240.3.216/29	10.240.3.217 – 10.240.3.222	10.240.3.223
125	10.240.3.224/29	10.240.3.225 – 10.240.3.230	10.240.3.231
126	10.240.3.232/29	10.240.3.233 – 10.240.3.238	10.240.3.239
127	10.240.3.240/29	10.240.3.241 – 10.240.3.246	10.240.3.247
128	10.240.3.248/29	10.240.3.249 – 10.240.3.254	10.240.3.255
129	10.240.4.0/29	10.240.4.1 – 10.240.4.6	10.240.4.7
130	10.240.4.8/29	10.240.4.9 – 10.240.4.14	10.240.4.15
131	10.240.4.16/29	10.240.4.17 – 10.240.4.22	10.240.4.23
132	10.240.4.24/29	10.240.4.25 – 10.240.4.30	10.240.4.31
133	10.240.4.32/29	10.240.4.33 – 10.240.4.38	10.240.4.39
134	10.240.4.40/29	10.240.4.41 – 10.240.4.46	10.240.4.47
135	10.240.4.48/29	10.240.4.49 – 10.240.4.54	10.240.4.55
136	10.240.4.56/29	10.240.4.57 – 10.240.4.62	10.240.4.63
137	10.240.4.64/29	10.240.4.65 – 10.240.4.70	10.240.4.71
138	10.240.4.72/29	10.240.4.73 – 10.240.4.78	10.240.4.79
139	10.240.4.80/29	10.240.4.81 – 10.240.4.86	10.240.4.87
140	10.240.4.88/29	10.240.4.89 – 10.240.4.94	10.240.4.95
141	10.240.4.96/29	10.240.4.97 – 10.240.4.102	10.240.4.103
142	10.240.4.104/29	10.240.4.105 – 10.240.4.110	10.240.4.111
143	10.240.4.112/29	10.240.4.113 – 10.240.4.118	10.240.4.119
144	10.240.4.120/29	10.240.4.121 – 10.240.4.126	10.240.4.127
145	10.240.4.128/29	10.240.4.129 – 10.240.4.134	10.240.4.135
146	10.240.4.136/29	10.240.4.137 – 10.240.4.142	10.240.4.143
147	10.240.4.144/29	10.240.4.145 – 10.240.4.150	10.240.4.151
148	10.240.4.152/29	10.240.4.153 – 10.240.4.158	10.240.4.159
149	10.240.4.160/29	10.240.4.161 – 10.240.4.166	10.240.4.167
150	10.240.4.168/29	10.240.4.169 – 10.240.4.174	10.240.4.175
151	10.240.4.176/29	10.240.4.177 – 10.240.4.182	10.240.4.183
152	10.240.4.184/29	10.240.4.185 – 10.240.4.190	10.240.4.191
153	10.240.4.192/29	10.240.4.193 – 10.240.4.198	10.240.4.199
154	10.240.4.200/29	10.240.4.201 – 10.240.4.206	10.240.4.207
155	10.240.4.208/29	10.240.4.209 – 10.240.4.214	10.240.4.215
156	10.240.4.216/29	10.240.4.217 – 10.240.4.222	10.240.4.223
157	10.240.4.224/29	10.240.4.225 – 10.240.4.230	10.240.4.231
158	10.240.4.232/29	10.240.4.233 – 10.240.4.238	10.240.4.239
159	10.240.4.240/29	10.240.4.241 – 10.240.4.246	10.240.4.247
160	10.240.4.248/29	10.240.4.249 – 10.240.4.254	10.240.4.255
161	10.240.5.0/29	10.240.5.1 – 10.240.5.6	10.240.5.7
162	10.240.5.8/29	10.240.5.9 – 10.240.5.14	10.240.5.15
163	10.240.5.16/29	10.240.5.17 – 10.240.5.22	10.240.5.23
164	10.240.5.24/29	10.240.5.25 – 10.240.5.30	10.240.5.31
165	10.240.5.32/29	10.240.5.33 – 10.240.5.38	10.240.5.39
166	10.240.5.40/29	10.240.5.41 – 10.240.5.46	10.240.5.47
167	10.240.5.48/29	10.240.5.49 – 10.240.5.54	10.240.5.55
168	10.240.5.56/29	10.240.5.57 – 10.240.5.62	10.240.5.63
169	10.240.5.64/29	10.240.5.65 – 10.240.5.70	10.240.5.71
170	10.240.5.72/29	10.240.5.73 – 10.240.5.78	10.240.5.79
171	10.240.5.80/29	10.240.5.81 – 10.240.5.86	10.240.5.87
172	10.240.5.88/29	10.240.5.89 – 10.240.5.94	10.240.5.95
173	10.240.5.96/29	10.240.5.97 – 10.240.5.102	10.240.5.103
174	10.240.5.104/29	10.240.5.105 – 10.240.5.110	10.240.5.111
175	10.240.5.112/29	10.240.5.113 – 10.240.5.118	10.240.5.119
176	10.240.5.120/29	10.240.5.121 – 10.240.5.126	10.240.5.127
177	10.240.5.128/29	10.240.5.129 – 10.240.5.134	10.240.5.135
178	10.240.5.136/29	10.240.5.137 – 10.240.5.142	10.240.5.143
179	10.240.5.144/29	10.240.5.145 – 10.240.5.150	10.240.5.151
180	10.240.5.152/29	10.240.5.153 – 10.240.5.158	10.240.5.159
181	10.240.5.160/29	10.240.5.161 – 10.240.5.166	10.240.5.167
182	10.240.5.168/29	10.240.5.169 – 10.240.5.174	10.240.5.175
183	10.240.5.176/29	10.240.5.177 – 10.240.5.182	10.240.5.183
184	10.240.5.184/29	10.240.5.185 – 10.240.5.190	10.240.5.191
185	10.240.5.192/29	10.240.5.193 – 10.240.5.198	10.240.5.199
186	10.240.5.200/29	10.240.5.201 – 10.240.5.206	10.240.5.207
187	10.240.5.208/29	10.240.5.209 – 10.240.5.214	10.240.5.215
188	10.240.5.216/29	10.240.5.217 – 10.240.5.222	10.240.5.223
189	10.240.5.224/29	10.240.5.225 – 10.240.5.230	10.240.5.231
190	10.240.5.232/29	10.240.5.233 – 10.240.5.238	10.240.5.239
191	10.240.5.240/29	10.240.5.241 – 10.240.5.246	10.240.5.247
192	10.240.5.248/29	10.240.5.249 – 10.240.5.254	10.240.5.255
193	10.240.6.0/29	10.240.6.1 – 10.240.6.6	10.240.6.7
194	10.240.6.8/29	10.240.6.9 – 10.240.6.14	10.240.6.15
195	10.240.6.16/29	10.240.6.17 – 10.240.6.22	10.240.6.23
196	10.240.6.24/29	10.240.6.25 – 10.240.6.30	10.240.6.31
197	10.240.6.32/29	10.240.6.33 – 10.240.6.38	10.240.6.39
198	10.240.6.40/29	10.240.6.41 – 10.240.6.46	10.240.6.47
199	10.240.6.48/29	10.240.6.49 – 10.240.6.54	10.240.6.55
200	10.240.6.56/29	10.240.6.57 – 10.240.6.62	10.240.6.63
201	10.240.6.64/29	10.240.6.65 – 10.240.6.70	10.240.6.71
202	10.240.6.72/29	10.240.6.73 – 10.240.6.78	10.240.6.79
203	10.240.6.80/29	10.240.6.81 – 10.240.6.86	10.240.6.87
204	10.240.6.88/29	10.240.6.89 – 10.240.6.94	10.240.6.95
205	10.240.6.96/29	10.240.6.97 – 10.240.6.102	10.240.6.103
206	10.240.6.104/29	10.240.6.105 – 10.240.6.110	10.240.6.111
207	10.240.6.112/29	10.240.6.113 – 10.240.6.118	10.240.6.119
208	10.240.6.120/29	10.240.6.121 – 10.240.6.126	10.240.6.127
209	10.240.6.128/29	10.240.6.129 – 10.240.6.134	10.240.6.135
210	10.240.6.136/29	10.240.6.137 – 10.240.6.142	10.240.6.143
211	10.240.6.144/29	10.240.6.145 – 10.240.6.150	10.240.6.151
212	10.240.6.152/29	10.240.6.153 – 10.240.6.158	10.240.6.159
213	10.240.6.160/29	10.240.6.161 – 10.240.6.166	10.240.6.167
214	10.240.6.168/29	10.240.6.169 – 10.240.6.174	10.240.6.175
215	10.240.6.176/29	10.240.6.177 – 10.240.6.182	10.240.6.183
216	10.240.6.184/29	10.240.6.185 – 10.240.6.190	10.240.6.191
217	10.240.6.192/29	10.240.6.193 – 10.240.6.198	10.240.6.199
218	10.240.6.200/29	10.240.6.201 – 10.240.6.206	10.240.6.207
219	10.240.6.208/29	10.240.6.209 – 10.240.6.214	10.240.6.215
220	10.240.6.216/29	10.240.6.217 – 10.240.6.222	10.240.6.223
221	10.240.6.224/29	10.240.6.225 – 10.240.6.230	10.240.6.231
222	10.240.6.232/29	10.240.6.233 – 10.240.6.238	10.240.6.239
223	10.240.6.240/29	10.240.6.241 – 10.240.6.246	10.240.6.247
224	10.240.6.248/29	10.240.6.249 – 10.240.6.254	10.240.6.255
225	10.240.7.0/29	10.240.7.1 – 10.240.7.6	10.240.7.7
226	10.240.7.8/29	10.240.7.9 – 10.240.7.14	10.240.7.15
227	10.240.7.16/29	10.240.7.17 – 10.240.7.22	10.240.7.23
228	10.240.7.24/29	10.240.7.25 – 10.240.7.30	10.240.7.31
229	10.240.7.32/29	10.240.7.33 – 10.240.7.38	10.240.7.39
230	10.240.7.40/29	10.240.7.41 – 10.240.7.46	10.240.7.47
231	10.240.7.48/29	10.240.7.49 – 10.240.7.54	10.240.7.55
232	10.240.7.56/29	10.240.7.57 – 10.240.7.62	10.240.7.63
233	10.240.7.64/29	10.240.7.65 – 10.240.7.70	10.240.7.71
234	10.240.7.72/29	10.240.7.73 – 10.240.7.78	10.240.7.79
235	10.240.7.80/29	10.240.7.81 – 10.240.7.86	10.240.7.87
236	10.240.7.88/29	10.240.7.89 – 10.240.7.94	10.240.7.95
237	10.240.7.96/29	10.240.7.97 – 10.240.7.102	10.240.7.103
238	10.240.7.104/29	10.240.7.105 – 10.240.7.110	10.240.7.111
239	10.240.7.112/29	10.240.7.113 – 10.240.7.118	10.240.7.119
240	10.240.7.120/29	10.240.7.121 – 10.240.7.126	10.240.7.127
241	10.240.7.128/29	10.240.7.129 – 10.240.7.134	10.240.7.135
242	10.240.7.136/29	10.240.7.137 – 10.240.7.142	10.240.7.143
243	10.240.7.144/29	10.240.7.145 – 10.240.7.150	10.240.7.151
244	10.240.7.152/29	10.240.7.153 – 10.240.7.158	10.240.7.159
245	10.240.7.160/29	10.240.7.161 – 10.240.7.166	10.240.7.167
246	10.240.7.168/29	10.240.7.169 – 10.240.7.174	10.240.7.175
247	10.240.7.176/29	10.240.7.177 – 10.240.7.182	10.240.7.183
248	10.240.7.184/29	10.240.7.185 – 10.240.7.190	10.240.7.191
249	10.240.7.192/29	10.240.7.193 – 10.240.7.198	10.240.7.199
250	10.240.7.200/29	10.240.7.201 – 10.240.7.206	10.240.7.207
251	10.240.7.208/29	10.240.7.209 – 10.240.7.214	10.240.7.215
252	10.240.7.216/29	10.240.7.217 – 10.240.7.222	10.240.7.223
253	10.240.7.224/29	10.240.7.225 – 10.240.7.230	10.240.7.231
254	10.240.7.232/29	10.240.7.233 – 10.240.7.238	10.240.7.239
255	10.240.7.240/29	10.240.7.241 – 10.240.7.246	10.240.7.247
256	10.240.7.248/29	10.240.7.249 – 10.240.7.254	10.240.7.255

showing 256 of 131,072

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 /12
/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	1
/13	255.248.0.0	524,288	524,286	2 split →
/14	255.252.0.0	262,144	262,142	4 split →
/15	255.254.0.0	131,072	131,070	8 split →
/16	255.255.0.0	65,536	65,534	16 split →
/17	255.255.128.0	32,768	32,766	32 split →
/18	255.255.192.0	16,384	16,382	64 split →
/19	255.255.224.0	8,192	8,190	128 split →
/20	255.255.240.0	4,096	4,094	256 split →
/21	255.255.248.0	2,048	2,046	512 split →
/22	255.255.252.0	1,024	1,022	1,024 split →
/23	255.255.254.0	512	510	2,048 split →
/24	255.255.255.0	256	254	4,096 split →
/25	255.255.255.128	128	126	8,192 split →
/26	255.255.255.192	64	62	16,384 split →
/27	255.255.255.224	32	30	32,768 split →
/28	255.255.255.240	16	14	65,536 split →
/29	255.255.255.248	8	6	131,072 split →
/30	255.255.255.252	4	2	262,144 split →
/31	255.255.255.254	2	2	524,288 split →
/32	255.255.255.255	1	1	1,048,576 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 →