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)10.78.240.0/20

network10.78.240.0/20

broadcast10.78.255.255

first host10.78.240.1

last host10.78.255.254

subnet mask255.255.240.0

wildcard0.0.15.255

addresses4,096

usable hosts4,094

classA

ipcalc 10.78.240.0/20

address00001010.01001110.11110000.00000000

subnet mask11111111.11111111.11110000.00000000

network00001010.01001110.11110000.00000000

broadcast00001010.01001110.11111111.11111111

green = network part, grey = host part

hex0x0a4ef000

decimal172945408

reverse dns0.240.78.10.in-addr.arpa

ipv4-mapped::ffff:a4e:f000

/20 split into /29 · 512 subnets

close ×

#	network	host range	broadcast
1	10.78.240.0/29	10.78.240.1 – 10.78.240.6	10.78.240.7
2	10.78.240.8/29	10.78.240.9 – 10.78.240.14	10.78.240.15
3	10.78.240.16/29	10.78.240.17 – 10.78.240.22	10.78.240.23
4	10.78.240.24/29	10.78.240.25 – 10.78.240.30	10.78.240.31
5	10.78.240.32/29	10.78.240.33 – 10.78.240.38	10.78.240.39
6	10.78.240.40/29	10.78.240.41 – 10.78.240.46	10.78.240.47
7	10.78.240.48/29	10.78.240.49 – 10.78.240.54	10.78.240.55
8	10.78.240.56/29	10.78.240.57 – 10.78.240.62	10.78.240.63
9	10.78.240.64/29	10.78.240.65 – 10.78.240.70	10.78.240.71
10	10.78.240.72/29	10.78.240.73 – 10.78.240.78	10.78.240.79
11	10.78.240.80/29	10.78.240.81 – 10.78.240.86	10.78.240.87
12	10.78.240.88/29	10.78.240.89 – 10.78.240.94	10.78.240.95
13	10.78.240.96/29	10.78.240.97 – 10.78.240.102	10.78.240.103
14	10.78.240.104/29	10.78.240.105 – 10.78.240.110	10.78.240.111
15	10.78.240.112/29	10.78.240.113 – 10.78.240.118	10.78.240.119
16	10.78.240.120/29	10.78.240.121 – 10.78.240.126	10.78.240.127
17	10.78.240.128/29	10.78.240.129 – 10.78.240.134	10.78.240.135
18	10.78.240.136/29	10.78.240.137 – 10.78.240.142	10.78.240.143
19	10.78.240.144/29	10.78.240.145 – 10.78.240.150	10.78.240.151
20	10.78.240.152/29	10.78.240.153 – 10.78.240.158	10.78.240.159
21	10.78.240.160/29	10.78.240.161 – 10.78.240.166	10.78.240.167
22	10.78.240.168/29	10.78.240.169 – 10.78.240.174	10.78.240.175
23	10.78.240.176/29	10.78.240.177 – 10.78.240.182	10.78.240.183
24	10.78.240.184/29	10.78.240.185 – 10.78.240.190	10.78.240.191
25	10.78.240.192/29	10.78.240.193 – 10.78.240.198	10.78.240.199
26	10.78.240.200/29	10.78.240.201 – 10.78.240.206	10.78.240.207
27	10.78.240.208/29	10.78.240.209 – 10.78.240.214	10.78.240.215
28	10.78.240.216/29	10.78.240.217 – 10.78.240.222	10.78.240.223
29	10.78.240.224/29	10.78.240.225 – 10.78.240.230	10.78.240.231
30	10.78.240.232/29	10.78.240.233 – 10.78.240.238	10.78.240.239
31	10.78.240.240/29	10.78.240.241 – 10.78.240.246	10.78.240.247
32	10.78.240.248/29	10.78.240.249 – 10.78.240.254	10.78.240.255
33	10.78.241.0/29	10.78.241.1 – 10.78.241.6	10.78.241.7
34	10.78.241.8/29	10.78.241.9 – 10.78.241.14	10.78.241.15
35	10.78.241.16/29	10.78.241.17 – 10.78.241.22	10.78.241.23
36	10.78.241.24/29	10.78.241.25 – 10.78.241.30	10.78.241.31
37	10.78.241.32/29	10.78.241.33 – 10.78.241.38	10.78.241.39
38	10.78.241.40/29	10.78.241.41 – 10.78.241.46	10.78.241.47
39	10.78.241.48/29	10.78.241.49 – 10.78.241.54	10.78.241.55
40	10.78.241.56/29	10.78.241.57 – 10.78.241.62	10.78.241.63
41	10.78.241.64/29	10.78.241.65 – 10.78.241.70	10.78.241.71
42	10.78.241.72/29	10.78.241.73 – 10.78.241.78	10.78.241.79
43	10.78.241.80/29	10.78.241.81 – 10.78.241.86	10.78.241.87
44	10.78.241.88/29	10.78.241.89 – 10.78.241.94	10.78.241.95
45	10.78.241.96/29	10.78.241.97 – 10.78.241.102	10.78.241.103
46	10.78.241.104/29	10.78.241.105 – 10.78.241.110	10.78.241.111
47	10.78.241.112/29	10.78.241.113 – 10.78.241.118	10.78.241.119
48	10.78.241.120/29	10.78.241.121 – 10.78.241.126	10.78.241.127
49	10.78.241.128/29	10.78.241.129 – 10.78.241.134	10.78.241.135
50	10.78.241.136/29	10.78.241.137 – 10.78.241.142	10.78.241.143
51	10.78.241.144/29	10.78.241.145 – 10.78.241.150	10.78.241.151
52	10.78.241.152/29	10.78.241.153 – 10.78.241.158	10.78.241.159
53	10.78.241.160/29	10.78.241.161 – 10.78.241.166	10.78.241.167
54	10.78.241.168/29	10.78.241.169 – 10.78.241.174	10.78.241.175
55	10.78.241.176/29	10.78.241.177 – 10.78.241.182	10.78.241.183
56	10.78.241.184/29	10.78.241.185 – 10.78.241.190	10.78.241.191
57	10.78.241.192/29	10.78.241.193 – 10.78.241.198	10.78.241.199
58	10.78.241.200/29	10.78.241.201 – 10.78.241.206	10.78.241.207
59	10.78.241.208/29	10.78.241.209 – 10.78.241.214	10.78.241.215
60	10.78.241.216/29	10.78.241.217 – 10.78.241.222	10.78.241.223
61	10.78.241.224/29	10.78.241.225 – 10.78.241.230	10.78.241.231
62	10.78.241.232/29	10.78.241.233 – 10.78.241.238	10.78.241.239
63	10.78.241.240/29	10.78.241.241 – 10.78.241.246	10.78.241.247
64	10.78.241.248/29	10.78.241.249 – 10.78.241.254	10.78.241.255
65	10.78.242.0/29	10.78.242.1 – 10.78.242.6	10.78.242.7
66	10.78.242.8/29	10.78.242.9 – 10.78.242.14	10.78.242.15
67	10.78.242.16/29	10.78.242.17 – 10.78.242.22	10.78.242.23
68	10.78.242.24/29	10.78.242.25 – 10.78.242.30	10.78.242.31
69	10.78.242.32/29	10.78.242.33 – 10.78.242.38	10.78.242.39
70	10.78.242.40/29	10.78.242.41 – 10.78.242.46	10.78.242.47
71	10.78.242.48/29	10.78.242.49 – 10.78.242.54	10.78.242.55
72	10.78.242.56/29	10.78.242.57 – 10.78.242.62	10.78.242.63
73	10.78.242.64/29	10.78.242.65 – 10.78.242.70	10.78.242.71
74	10.78.242.72/29	10.78.242.73 – 10.78.242.78	10.78.242.79
75	10.78.242.80/29	10.78.242.81 – 10.78.242.86	10.78.242.87
76	10.78.242.88/29	10.78.242.89 – 10.78.242.94	10.78.242.95
77	10.78.242.96/29	10.78.242.97 – 10.78.242.102	10.78.242.103
78	10.78.242.104/29	10.78.242.105 – 10.78.242.110	10.78.242.111
79	10.78.242.112/29	10.78.242.113 – 10.78.242.118	10.78.242.119
80	10.78.242.120/29	10.78.242.121 – 10.78.242.126	10.78.242.127
81	10.78.242.128/29	10.78.242.129 – 10.78.242.134	10.78.242.135
82	10.78.242.136/29	10.78.242.137 – 10.78.242.142	10.78.242.143
83	10.78.242.144/29	10.78.242.145 – 10.78.242.150	10.78.242.151
84	10.78.242.152/29	10.78.242.153 – 10.78.242.158	10.78.242.159
85	10.78.242.160/29	10.78.242.161 – 10.78.242.166	10.78.242.167
86	10.78.242.168/29	10.78.242.169 – 10.78.242.174	10.78.242.175
87	10.78.242.176/29	10.78.242.177 – 10.78.242.182	10.78.242.183
88	10.78.242.184/29	10.78.242.185 – 10.78.242.190	10.78.242.191
89	10.78.242.192/29	10.78.242.193 – 10.78.242.198	10.78.242.199
90	10.78.242.200/29	10.78.242.201 – 10.78.242.206	10.78.242.207
91	10.78.242.208/29	10.78.242.209 – 10.78.242.214	10.78.242.215
92	10.78.242.216/29	10.78.242.217 – 10.78.242.222	10.78.242.223
93	10.78.242.224/29	10.78.242.225 – 10.78.242.230	10.78.242.231
94	10.78.242.232/29	10.78.242.233 – 10.78.242.238	10.78.242.239
95	10.78.242.240/29	10.78.242.241 – 10.78.242.246	10.78.242.247
96	10.78.242.248/29	10.78.242.249 – 10.78.242.254	10.78.242.255
97	10.78.243.0/29	10.78.243.1 – 10.78.243.6	10.78.243.7
98	10.78.243.8/29	10.78.243.9 – 10.78.243.14	10.78.243.15
99	10.78.243.16/29	10.78.243.17 – 10.78.243.22	10.78.243.23
100	10.78.243.24/29	10.78.243.25 – 10.78.243.30	10.78.243.31
101	10.78.243.32/29	10.78.243.33 – 10.78.243.38	10.78.243.39
102	10.78.243.40/29	10.78.243.41 – 10.78.243.46	10.78.243.47
103	10.78.243.48/29	10.78.243.49 – 10.78.243.54	10.78.243.55
104	10.78.243.56/29	10.78.243.57 – 10.78.243.62	10.78.243.63
105	10.78.243.64/29	10.78.243.65 – 10.78.243.70	10.78.243.71
106	10.78.243.72/29	10.78.243.73 – 10.78.243.78	10.78.243.79
107	10.78.243.80/29	10.78.243.81 – 10.78.243.86	10.78.243.87
108	10.78.243.88/29	10.78.243.89 – 10.78.243.94	10.78.243.95
109	10.78.243.96/29	10.78.243.97 – 10.78.243.102	10.78.243.103
110	10.78.243.104/29	10.78.243.105 – 10.78.243.110	10.78.243.111
111	10.78.243.112/29	10.78.243.113 – 10.78.243.118	10.78.243.119
112	10.78.243.120/29	10.78.243.121 – 10.78.243.126	10.78.243.127
113	10.78.243.128/29	10.78.243.129 – 10.78.243.134	10.78.243.135
114	10.78.243.136/29	10.78.243.137 – 10.78.243.142	10.78.243.143
115	10.78.243.144/29	10.78.243.145 – 10.78.243.150	10.78.243.151
116	10.78.243.152/29	10.78.243.153 – 10.78.243.158	10.78.243.159
117	10.78.243.160/29	10.78.243.161 – 10.78.243.166	10.78.243.167
118	10.78.243.168/29	10.78.243.169 – 10.78.243.174	10.78.243.175
119	10.78.243.176/29	10.78.243.177 – 10.78.243.182	10.78.243.183
120	10.78.243.184/29	10.78.243.185 – 10.78.243.190	10.78.243.191
121	10.78.243.192/29	10.78.243.193 – 10.78.243.198	10.78.243.199
122	10.78.243.200/29	10.78.243.201 – 10.78.243.206	10.78.243.207
123	10.78.243.208/29	10.78.243.209 – 10.78.243.214	10.78.243.215
124	10.78.243.216/29	10.78.243.217 – 10.78.243.222	10.78.243.223
125	10.78.243.224/29	10.78.243.225 – 10.78.243.230	10.78.243.231
126	10.78.243.232/29	10.78.243.233 – 10.78.243.238	10.78.243.239
127	10.78.243.240/29	10.78.243.241 – 10.78.243.246	10.78.243.247
128	10.78.243.248/29	10.78.243.249 – 10.78.243.254	10.78.243.255
129	10.78.244.0/29	10.78.244.1 – 10.78.244.6	10.78.244.7
130	10.78.244.8/29	10.78.244.9 – 10.78.244.14	10.78.244.15
131	10.78.244.16/29	10.78.244.17 – 10.78.244.22	10.78.244.23
132	10.78.244.24/29	10.78.244.25 – 10.78.244.30	10.78.244.31
133	10.78.244.32/29	10.78.244.33 – 10.78.244.38	10.78.244.39
134	10.78.244.40/29	10.78.244.41 – 10.78.244.46	10.78.244.47
135	10.78.244.48/29	10.78.244.49 – 10.78.244.54	10.78.244.55
136	10.78.244.56/29	10.78.244.57 – 10.78.244.62	10.78.244.63
137	10.78.244.64/29	10.78.244.65 – 10.78.244.70	10.78.244.71
138	10.78.244.72/29	10.78.244.73 – 10.78.244.78	10.78.244.79
139	10.78.244.80/29	10.78.244.81 – 10.78.244.86	10.78.244.87
140	10.78.244.88/29	10.78.244.89 – 10.78.244.94	10.78.244.95
141	10.78.244.96/29	10.78.244.97 – 10.78.244.102	10.78.244.103
142	10.78.244.104/29	10.78.244.105 – 10.78.244.110	10.78.244.111
143	10.78.244.112/29	10.78.244.113 – 10.78.244.118	10.78.244.119
144	10.78.244.120/29	10.78.244.121 – 10.78.244.126	10.78.244.127
145	10.78.244.128/29	10.78.244.129 – 10.78.244.134	10.78.244.135
146	10.78.244.136/29	10.78.244.137 – 10.78.244.142	10.78.244.143
147	10.78.244.144/29	10.78.244.145 – 10.78.244.150	10.78.244.151
148	10.78.244.152/29	10.78.244.153 – 10.78.244.158	10.78.244.159
149	10.78.244.160/29	10.78.244.161 – 10.78.244.166	10.78.244.167
150	10.78.244.168/29	10.78.244.169 – 10.78.244.174	10.78.244.175
151	10.78.244.176/29	10.78.244.177 – 10.78.244.182	10.78.244.183
152	10.78.244.184/29	10.78.244.185 – 10.78.244.190	10.78.244.191
153	10.78.244.192/29	10.78.244.193 – 10.78.244.198	10.78.244.199
154	10.78.244.200/29	10.78.244.201 – 10.78.244.206	10.78.244.207
155	10.78.244.208/29	10.78.244.209 – 10.78.244.214	10.78.244.215
156	10.78.244.216/29	10.78.244.217 – 10.78.244.222	10.78.244.223
157	10.78.244.224/29	10.78.244.225 – 10.78.244.230	10.78.244.231
158	10.78.244.232/29	10.78.244.233 – 10.78.244.238	10.78.244.239
159	10.78.244.240/29	10.78.244.241 – 10.78.244.246	10.78.244.247
160	10.78.244.248/29	10.78.244.249 – 10.78.244.254	10.78.244.255
161	10.78.245.0/29	10.78.245.1 – 10.78.245.6	10.78.245.7
162	10.78.245.8/29	10.78.245.9 – 10.78.245.14	10.78.245.15
163	10.78.245.16/29	10.78.245.17 – 10.78.245.22	10.78.245.23
164	10.78.245.24/29	10.78.245.25 – 10.78.245.30	10.78.245.31
165	10.78.245.32/29	10.78.245.33 – 10.78.245.38	10.78.245.39
166	10.78.245.40/29	10.78.245.41 – 10.78.245.46	10.78.245.47
167	10.78.245.48/29	10.78.245.49 – 10.78.245.54	10.78.245.55
168	10.78.245.56/29	10.78.245.57 – 10.78.245.62	10.78.245.63
169	10.78.245.64/29	10.78.245.65 – 10.78.245.70	10.78.245.71
170	10.78.245.72/29	10.78.245.73 – 10.78.245.78	10.78.245.79
171	10.78.245.80/29	10.78.245.81 – 10.78.245.86	10.78.245.87
172	10.78.245.88/29	10.78.245.89 – 10.78.245.94	10.78.245.95
173	10.78.245.96/29	10.78.245.97 – 10.78.245.102	10.78.245.103
174	10.78.245.104/29	10.78.245.105 – 10.78.245.110	10.78.245.111
175	10.78.245.112/29	10.78.245.113 – 10.78.245.118	10.78.245.119
176	10.78.245.120/29	10.78.245.121 – 10.78.245.126	10.78.245.127
177	10.78.245.128/29	10.78.245.129 – 10.78.245.134	10.78.245.135
178	10.78.245.136/29	10.78.245.137 – 10.78.245.142	10.78.245.143
179	10.78.245.144/29	10.78.245.145 – 10.78.245.150	10.78.245.151
180	10.78.245.152/29	10.78.245.153 – 10.78.245.158	10.78.245.159
181	10.78.245.160/29	10.78.245.161 – 10.78.245.166	10.78.245.167
182	10.78.245.168/29	10.78.245.169 – 10.78.245.174	10.78.245.175
183	10.78.245.176/29	10.78.245.177 – 10.78.245.182	10.78.245.183
184	10.78.245.184/29	10.78.245.185 – 10.78.245.190	10.78.245.191
185	10.78.245.192/29	10.78.245.193 – 10.78.245.198	10.78.245.199
186	10.78.245.200/29	10.78.245.201 – 10.78.245.206	10.78.245.207
187	10.78.245.208/29	10.78.245.209 – 10.78.245.214	10.78.245.215
188	10.78.245.216/29	10.78.245.217 – 10.78.245.222	10.78.245.223
189	10.78.245.224/29	10.78.245.225 – 10.78.245.230	10.78.245.231
190	10.78.245.232/29	10.78.245.233 – 10.78.245.238	10.78.245.239
191	10.78.245.240/29	10.78.245.241 – 10.78.245.246	10.78.245.247
192	10.78.245.248/29	10.78.245.249 – 10.78.245.254	10.78.245.255
193	10.78.246.0/29	10.78.246.1 – 10.78.246.6	10.78.246.7
194	10.78.246.8/29	10.78.246.9 – 10.78.246.14	10.78.246.15
195	10.78.246.16/29	10.78.246.17 – 10.78.246.22	10.78.246.23
196	10.78.246.24/29	10.78.246.25 – 10.78.246.30	10.78.246.31
197	10.78.246.32/29	10.78.246.33 – 10.78.246.38	10.78.246.39
198	10.78.246.40/29	10.78.246.41 – 10.78.246.46	10.78.246.47
199	10.78.246.48/29	10.78.246.49 – 10.78.246.54	10.78.246.55
200	10.78.246.56/29	10.78.246.57 – 10.78.246.62	10.78.246.63
201	10.78.246.64/29	10.78.246.65 – 10.78.246.70	10.78.246.71
202	10.78.246.72/29	10.78.246.73 – 10.78.246.78	10.78.246.79
203	10.78.246.80/29	10.78.246.81 – 10.78.246.86	10.78.246.87
204	10.78.246.88/29	10.78.246.89 – 10.78.246.94	10.78.246.95
205	10.78.246.96/29	10.78.246.97 – 10.78.246.102	10.78.246.103
206	10.78.246.104/29	10.78.246.105 – 10.78.246.110	10.78.246.111
207	10.78.246.112/29	10.78.246.113 – 10.78.246.118	10.78.246.119
208	10.78.246.120/29	10.78.246.121 – 10.78.246.126	10.78.246.127
209	10.78.246.128/29	10.78.246.129 – 10.78.246.134	10.78.246.135
210	10.78.246.136/29	10.78.246.137 – 10.78.246.142	10.78.246.143
211	10.78.246.144/29	10.78.246.145 – 10.78.246.150	10.78.246.151
212	10.78.246.152/29	10.78.246.153 – 10.78.246.158	10.78.246.159
213	10.78.246.160/29	10.78.246.161 – 10.78.246.166	10.78.246.167
214	10.78.246.168/29	10.78.246.169 – 10.78.246.174	10.78.246.175
215	10.78.246.176/29	10.78.246.177 – 10.78.246.182	10.78.246.183
216	10.78.246.184/29	10.78.246.185 – 10.78.246.190	10.78.246.191
217	10.78.246.192/29	10.78.246.193 – 10.78.246.198	10.78.246.199
218	10.78.246.200/29	10.78.246.201 – 10.78.246.206	10.78.246.207
219	10.78.246.208/29	10.78.246.209 – 10.78.246.214	10.78.246.215
220	10.78.246.216/29	10.78.246.217 – 10.78.246.222	10.78.246.223
221	10.78.246.224/29	10.78.246.225 – 10.78.246.230	10.78.246.231
222	10.78.246.232/29	10.78.246.233 – 10.78.246.238	10.78.246.239
223	10.78.246.240/29	10.78.246.241 – 10.78.246.246	10.78.246.247
224	10.78.246.248/29	10.78.246.249 – 10.78.246.254	10.78.246.255
225	10.78.247.0/29	10.78.247.1 – 10.78.247.6	10.78.247.7
226	10.78.247.8/29	10.78.247.9 – 10.78.247.14	10.78.247.15
227	10.78.247.16/29	10.78.247.17 – 10.78.247.22	10.78.247.23
228	10.78.247.24/29	10.78.247.25 – 10.78.247.30	10.78.247.31
229	10.78.247.32/29	10.78.247.33 – 10.78.247.38	10.78.247.39
230	10.78.247.40/29	10.78.247.41 – 10.78.247.46	10.78.247.47
231	10.78.247.48/29	10.78.247.49 – 10.78.247.54	10.78.247.55
232	10.78.247.56/29	10.78.247.57 – 10.78.247.62	10.78.247.63
233	10.78.247.64/29	10.78.247.65 – 10.78.247.70	10.78.247.71
234	10.78.247.72/29	10.78.247.73 – 10.78.247.78	10.78.247.79
235	10.78.247.80/29	10.78.247.81 – 10.78.247.86	10.78.247.87
236	10.78.247.88/29	10.78.247.89 – 10.78.247.94	10.78.247.95
237	10.78.247.96/29	10.78.247.97 – 10.78.247.102	10.78.247.103
238	10.78.247.104/29	10.78.247.105 – 10.78.247.110	10.78.247.111
239	10.78.247.112/29	10.78.247.113 – 10.78.247.118	10.78.247.119
240	10.78.247.120/29	10.78.247.121 – 10.78.247.126	10.78.247.127
241	10.78.247.128/29	10.78.247.129 – 10.78.247.134	10.78.247.135
242	10.78.247.136/29	10.78.247.137 – 10.78.247.142	10.78.247.143
243	10.78.247.144/29	10.78.247.145 – 10.78.247.150	10.78.247.151
244	10.78.247.152/29	10.78.247.153 – 10.78.247.158	10.78.247.159
245	10.78.247.160/29	10.78.247.161 – 10.78.247.166	10.78.247.167
246	10.78.247.168/29	10.78.247.169 – 10.78.247.174	10.78.247.175
247	10.78.247.176/29	10.78.247.177 – 10.78.247.182	10.78.247.183
248	10.78.247.184/29	10.78.247.185 – 10.78.247.190	10.78.247.191
249	10.78.247.192/29	10.78.247.193 – 10.78.247.198	10.78.247.199
250	10.78.247.200/29	10.78.247.201 – 10.78.247.206	10.78.247.207
251	10.78.247.208/29	10.78.247.209 – 10.78.247.214	10.78.247.215
252	10.78.247.216/29	10.78.247.217 – 10.78.247.222	10.78.247.223
253	10.78.247.224/29	10.78.247.225 – 10.78.247.230	10.78.247.231
254	10.78.247.232/29	10.78.247.233 – 10.78.247.238	10.78.247.239
255	10.78.247.240/29	10.78.247.241 – 10.78.247.246	10.78.247.247
256	10.78.247.248/29	10.78.247.249 – 10.78.247.254	10.78.247.255

showing 256 of 512

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