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 /28 · 256 subnets

close ×

#	network	host range	broadcast
1	10.78.240.0/28	10.78.240.1 – 10.78.240.14	10.78.240.15
2	10.78.240.16/28	10.78.240.17 – 10.78.240.30	10.78.240.31
3	10.78.240.32/28	10.78.240.33 – 10.78.240.46	10.78.240.47
4	10.78.240.48/28	10.78.240.49 – 10.78.240.62	10.78.240.63
5	10.78.240.64/28	10.78.240.65 – 10.78.240.78	10.78.240.79
6	10.78.240.80/28	10.78.240.81 – 10.78.240.94	10.78.240.95
7	10.78.240.96/28	10.78.240.97 – 10.78.240.110	10.78.240.111
8	10.78.240.112/28	10.78.240.113 – 10.78.240.126	10.78.240.127
9	10.78.240.128/28	10.78.240.129 – 10.78.240.142	10.78.240.143
10	10.78.240.144/28	10.78.240.145 – 10.78.240.158	10.78.240.159
11	10.78.240.160/28	10.78.240.161 – 10.78.240.174	10.78.240.175
12	10.78.240.176/28	10.78.240.177 – 10.78.240.190	10.78.240.191
13	10.78.240.192/28	10.78.240.193 – 10.78.240.206	10.78.240.207
14	10.78.240.208/28	10.78.240.209 – 10.78.240.222	10.78.240.223
15	10.78.240.224/28	10.78.240.225 – 10.78.240.238	10.78.240.239
16	10.78.240.240/28	10.78.240.241 – 10.78.240.254	10.78.240.255
17	10.78.241.0/28	10.78.241.1 – 10.78.241.14	10.78.241.15
18	10.78.241.16/28	10.78.241.17 – 10.78.241.30	10.78.241.31
19	10.78.241.32/28	10.78.241.33 – 10.78.241.46	10.78.241.47
20	10.78.241.48/28	10.78.241.49 – 10.78.241.62	10.78.241.63
21	10.78.241.64/28	10.78.241.65 – 10.78.241.78	10.78.241.79
22	10.78.241.80/28	10.78.241.81 – 10.78.241.94	10.78.241.95
23	10.78.241.96/28	10.78.241.97 – 10.78.241.110	10.78.241.111
24	10.78.241.112/28	10.78.241.113 – 10.78.241.126	10.78.241.127
25	10.78.241.128/28	10.78.241.129 – 10.78.241.142	10.78.241.143
26	10.78.241.144/28	10.78.241.145 – 10.78.241.158	10.78.241.159
27	10.78.241.160/28	10.78.241.161 – 10.78.241.174	10.78.241.175
28	10.78.241.176/28	10.78.241.177 – 10.78.241.190	10.78.241.191
29	10.78.241.192/28	10.78.241.193 – 10.78.241.206	10.78.241.207
30	10.78.241.208/28	10.78.241.209 – 10.78.241.222	10.78.241.223
31	10.78.241.224/28	10.78.241.225 – 10.78.241.238	10.78.241.239
32	10.78.241.240/28	10.78.241.241 – 10.78.241.254	10.78.241.255
33	10.78.242.0/28	10.78.242.1 – 10.78.242.14	10.78.242.15
34	10.78.242.16/28	10.78.242.17 – 10.78.242.30	10.78.242.31
35	10.78.242.32/28	10.78.242.33 – 10.78.242.46	10.78.242.47
36	10.78.242.48/28	10.78.242.49 – 10.78.242.62	10.78.242.63
37	10.78.242.64/28	10.78.242.65 – 10.78.242.78	10.78.242.79
38	10.78.242.80/28	10.78.242.81 – 10.78.242.94	10.78.242.95
39	10.78.242.96/28	10.78.242.97 – 10.78.242.110	10.78.242.111
40	10.78.242.112/28	10.78.242.113 – 10.78.242.126	10.78.242.127
41	10.78.242.128/28	10.78.242.129 – 10.78.242.142	10.78.242.143
42	10.78.242.144/28	10.78.242.145 – 10.78.242.158	10.78.242.159
43	10.78.242.160/28	10.78.242.161 – 10.78.242.174	10.78.242.175
44	10.78.242.176/28	10.78.242.177 – 10.78.242.190	10.78.242.191
45	10.78.242.192/28	10.78.242.193 – 10.78.242.206	10.78.242.207
46	10.78.242.208/28	10.78.242.209 – 10.78.242.222	10.78.242.223
47	10.78.242.224/28	10.78.242.225 – 10.78.242.238	10.78.242.239
48	10.78.242.240/28	10.78.242.241 – 10.78.242.254	10.78.242.255
49	10.78.243.0/28	10.78.243.1 – 10.78.243.14	10.78.243.15
50	10.78.243.16/28	10.78.243.17 – 10.78.243.30	10.78.243.31
51	10.78.243.32/28	10.78.243.33 – 10.78.243.46	10.78.243.47
52	10.78.243.48/28	10.78.243.49 – 10.78.243.62	10.78.243.63
53	10.78.243.64/28	10.78.243.65 – 10.78.243.78	10.78.243.79
54	10.78.243.80/28	10.78.243.81 – 10.78.243.94	10.78.243.95
55	10.78.243.96/28	10.78.243.97 – 10.78.243.110	10.78.243.111
56	10.78.243.112/28	10.78.243.113 – 10.78.243.126	10.78.243.127
57	10.78.243.128/28	10.78.243.129 – 10.78.243.142	10.78.243.143
58	10.78.243.144/28	10.78.243.145 – 10.78.243.158	10.78.243.159
59	10.78.243.160/28	10.78.243.161 – 10.78.243.174	10.78.243.175
60	10.78.243.176/28	10.78.243.177 – 10.78.243.190	10.78.243.191
61	10.78.243.192/28	10.78.243.193 – 10.78.243.206	10.78.243.207
62	10.78.243.208/28	10.78.243.209 – 10.78.243.222	10.78.243.223
63	10.78.243.224/28	10.78.243.225 – 10.78.243.238	10.78.243.239
64	10.78.243.240/28	10.78.243.241 – 10.78.243.254	10.78.243.255
65	10.78.244.0/28	10.78.244.1 – 10.78.244.14	10.78.244.15
66	10.78.244.16/28	10.78.244.17 – 10.78.244.30	10.78.244.31
67	10.78.244.32/28	10.78.244.33 – 10.78.244.46	10.78.244.47
68	10.78.244.48/28	10.78.244.49 – 10.78.244.62	10.78.244.63
69	10.78.244.64/28	10.78.244.65 – 10.78.244.78	10.78.244.79
70	10.78.244.80/28	10.78.244.81 – 10.78.244.94	10.78.244.95
71	10.78.244.96/28	10.78.244.97 – 10.78.244.110	10.78.244.111
72	10.78.244.112/28	10.78.244.113 – 10.78.244.126	10.78.244.127
73	10.78.244.128/28	10.78.244.129 – 10.78.244.142	10.78.244.143
74	10.78.244.144/28	10.78.244.145 – 10.78.244.158	10.78.244.159
75	10.78.244.160/28	10.78.244.161 – 10.78.244.174	10.78.244.175
76	10.78.244.176/28	10.78.244.177 – 10.78.244.190	10.78.244.191
77	10.78.244.192/28	10.78.244.193 – 10.78.244.206	10.78.244.207
78	10.78.244.208/28	10.78.244.209 – 10.78.244.222	10.78.244.223
79	10.78.244.224/28	10.78.244.225 – 10.78.244.238	10.78.244.239
80	10.78.244.240/28	10.78.244.241 – 10.78.244.254	10.78.244.255
81	10.78.245.0/28	10.78.245.1 – 10.78.245.14	10.78.245.15
82	10.78.245.16/28	10.78.245.17 – 10.78.245.30	10.78.245.31
83	10.78.245.32/28	10.78.245.33 – 10.78.245.46	10.78.245.47
84	10.78.245.48/28	10.78.245.49 – 10.78.245.62	10.78.245.63
85	10.78.245.64/28	10.78.245.65 – 10.78.245.78	10.78.245.79
86	10.78.245.80/28	10.78.245.81 – 10.78.245.94	10.78.245.95
87	10.78.245.96/28	10.78.245.97 – 10.78.245.110	10.78.245.111
88	10.78.245.112/28	10.78.245.113 – 10.78.245.126	10.78.245.127
89	10.78.245.128/28	10.78.245.129 – 10.78.245.142	10.78.245.143
90	10.78.245.144/28	10.78.245.145 – 10.78.245.158	10.78.245.159
91	10.78.245.160/28	10.78.245.161 – 10.78.245.174	10.78.245.175
92	10.78.245.176/28	10.78.245.177 – 10.78.245.190	10.78.245.191
93	10.78.245.192/28	10.78.245.193 – 10.78.245.206	10.78.245.207
94	10.78.245.208/28	10.78.245.209 – 10.78.245.222	10.78.245.223
95	10.78.245.224/28	10.78.245.225 – 10.78.245.238	10.78.245.239
96	10.78.245.240/28	10.78.245.241 – 10.78.245.254	10.78.245.255
97	10.78.246.0/28	10.78.246.1 – 10.78.246.14	10.78.246.15
98	10.78.246.16/28	10.78.246.17 – 10.78.246.30	10.78.246.31
99	10.78.246.32/28	10.78.246.33 – 10.78.246.46	10.78.246.47
100	10.78.246.48/28	10.78.246.49 – 10.78.246.62	10.78.246.63
101	10.78.246.64/28	10.78.246.65 – 10.78.246.78	10.78.246.79
102	10.78.246.80/28	10.78.246.81 – 10.78.246.94	10.78.246.95
103	10.78.246.96/28	10.78.246.97 – 10.78.246.110	10.78.246.111
104	10.78.246.112/28	10.78.246.113 – 10.78.246.126	10.78.246.127
105	10.78.246.128/28	10.78.246.129 – 10.78.246.142	10.78.246.143
106	10.78.246.144/28	10.78.246.145 – 10.78.246.158	10.78.246.159
107	10.78.246.160/28	10.78.246.161 – 10.78.246.174	10.78.246.175
108	10.78.246.176/28	10.78.246.177 – 10.78.246.190	10.78.246.191
109	10.78.246.192/28	10.78.246.193 – 10.78.246.206	10.78.246.207
110	10.78.246.208/28	10.78.246.209 – 10.78.246.222	10.78.246.223
111	10.78.246.224/28	10.78.246.225 – 10.78.246.238	10.78.246.239
112	10.78.246.240/28	10.78.246.241 – 10.78.246.254	10.78.246.255
113	10.78.247.0/28	10.78.247.1 – 10.78.247.14	10.78.247.15
114	10.78.247.16/28	10.78.247.17 – 10.78.247.30	10.78.247.31
115	10.78.247.32/28	10.78.247.33 – 10.78.247.46	10.78.247.47
116	10.78.247.48/28	10.78.247.49 – 10.78.247.62	10.78.247.63
117	10.78.247.64/28	10.78.247.65 – 10.78.247.78	10.78.247.79
118	10.78.247.80/28	10.78.247.81 – 10.78.247.94	10.78.247.95
119	10.78.247.96/28	10.78.247.97 – 10.78.247.110	10.78.247.111
120	10.78.247.112/28	10.78.247.113 – 10.78.247.126	10.78.247.127
121	10.78.247.128/28	10.78.247.129 – 10.78.247.142	10.78.247.143
122	10.78.247.144/28	10.78.247.145 – 10.78.247.158	10.78.247.159
123	10.78.247.160/28	10.78.247.161 – 10.78.247.174	10.78.247.175
124	10.78.247.176/28	10.78.247.177 – 10.78.247.190	10.78.247.191
125	10.78.247.192/28	10.78.247.193 – 10.78.247.206	10.78.247.207
126	10.78.247.208/28	10.78.247.209 – 10.78.247.222	10.78.247.223
127	10.78.247.224/28	10.78.247.225 – 10.78.247.238	10.78.247.239
128	10.78.247.240/28	10.78.247.241 – 10.78.247.254	10.78.247.255
129	10.78.248.0/28	10.78.248.1 – 10.78.248.14	10.78.248.15
130	10.78.248.16/28	10.78.248.17 – 10.78.248.30	10.78.248.31
131	10.78.248.32/28	10.78.248.33 – 10.78.248.46	10.78.248.47
132	10.78.248.48/28	10.78.248.49 – 10.78.248.62	10.78.248.63
133	10.78.248.64/28	10.78.248.65 – 10.78.248.78	10.78.248.79
134	10.78.248.80/28	10.78.248.81 – 10.78.248.94	10.78.248.95
135	10.78.248.96/28	10.78.248.97 – 10.78.248.110	10.78.248.111
136	10.78.248.112/28	10.78.248.113 – 10.78.248.126	10.78.248.127
137	10.78.248.128/28	10.78.248.129 – 10.78.248.142	10.78.248.143
138	10.78.248.144/28	10.78.248.145 – 10.78.248.158	10.78.248.159
139	10.78.248.160/28	10.78.248.161 – 10.78.248.174	10.78.248.175
140	10.78.248.176/28	10.78.248.177 – 10.78.248.190	10.78.248.191
141	10.78.248.192/28	10.78.248.193 – 10.78.248.206	10.78.248.207
142	10.78.248.208/28	10.78.248.209 – 10.78.248.222	10.78.248.223
143	10.78.248.224/28	10.78.248.225 – 10.78.248.238	10.78.248.239
144	10.78.248.240/28	10.78.248.241 – 10.78.248.254	10.78.248.255
145	10.78.249.0/28	10.78.249.1 – 10.78.249.14	10.78.249.15
146	10.78.249.16/28	10.78.249.17 – 10.78.249.30	10.78.249.31
147	10.78.249.32/28	10.78.249.33 – 10.78.249.46	10.78.249.47
148	10.78.249.48/28	10.78.249.49 – 10.78.249.62	10.78.249.63
149	10.78.249.64/28	10.78.249.65 – 10.78.249.78	10.78.249.79
150	10.78.249.80/28	10.78.249.81 – 10.78.249.94	10.78.249.95
151	10.78.249.96/28	10.78.249.97 – 10.78.249.110	10.78.249.111
152	10.78.249.112/28	10.78.249.113 – 10.78.249.126	10.78.249.127
153	10.78.249.128/28	10.78.249.129 – 10.78.249.142	10.78.249.143
154	10.78.249.144/28	10.78.249.145 – 10.78.249.158	10.78.249.159
155	10.78.249.160/28	10.78.249.161 – 10.78.249.174	10.78.249.175
156	10.78.249.176/28	10.78.249.177 – 10.78.249.190	10.78.249.191
157	10.78.249.192/28	10.78.249.193 – 10.78.249.206	10.78.249.207
158	10.78.249.208/28	10.78.249.209 – 10.78.249.222	10.78.249.223
159	10.78.249.224/28	10.78.249.225 – 10.78.249.238	10.78.249.239
160	10.78.249.240/28	10.78.249.241 – 10.78.249.254	10.78.249.255
161	10.78.250.0/28	10.78.250.1 – 10.78.250.14	10.78.250.15
162	10.78.250.16/28	10.78.250.17 – 10.78.250.30	10.78.250.31
163	10.78.250.32/28	10.78.250.33 – 10.78.250.46	10.78.250.47
164	10.78.250.48/28	10.78.250.49 – 10.78.250.62	10.78.250.63
165	10.78.250.64/28	10.78.250.65 – 10.78.250.78	10.78.250.79
166	10.78.250.80/28	10.78.250.81 – 10.78.250.94	10.78.250.95
167	10.78.250.96/28	10.78.250.97 – 10.78.250.110	10.78.250.111
168	10.78.250.112/28	10.78.250.113 – 10.78.250.126	10.78.250.127
169	10.78.250.128/28	10.78.250.129 – 10.78.250.142	10.78.250.143
170	10.78.250.144/28	10.78.250.145 – 10.78.250.158	10.78.250.159
171	10.78.250.160/28	10.78.250.161 – 10.78.250.174	10.78.250.175
172	10.78.250.176/28	10.78.250.177 – 10.78.250.190	10.78.250.191
173	10.78.250.192/28	10.78.250.193 – 10.78.250.206	10.78.250.207
174	10.78.250.208/28	10.78.250.209 – 10.78.250.222	10.78.250.223
175	10.78.250.224/28	10.78.250.225 – 10.78.250.238	10.78.250.239
176	10.78.250.240/28	10.78.250.241 – 10.78.250.254	10.78.250.255
177	10.78.251.0/28	10.78.251.1 – 10.78.251.14	10.78.251.15
178	10.78.251.16/28	10.78.251.17 – 10.78.251.30	10.78.251.31
179	10.78.251.32/28	10.78.251.33 – 10.78.251.46	10.78.251.47
180	10.78.251.48/28	10.78.251.49 – 10.78.251.62	10.78.251.63
181	10.78.251.64/28	10.78.251.65 – 10.78.251.78	10.78.251.79
182	10.78.251.80/28	10.78.251.81 – 10.78.251.94	10.78.251.95
183	10.78.251.96/28	10.78.251.97 – 10.78.251.110	10.78.251.111
184	10.78.251.112/28	10.78.251.113 – 10.78.251.126	10.78.251.127
185	10.78.251.128/28	10.78.251.129 – 10.78.251.142	10.78.251.143
186	10.78.251.144/28	10.78.251.145 – 10.78.251.158	10.78.251.159
187	10.78.251.160/28	10.78.251.161 – 10.78.251.174	10.78.251.175
188	10.78.251.176/28	10.78.251.177 – 10.78.251.190	10.78.251.191
189	10.78.251.192/28	10.78.251.193 – 10.78.251.206	10.78.251.207
190	10.78.251.208/28	10.78.251.209 – 10.78.251.222	10.78.251.223
191	10.78.251.224/28	10.78.251.225 – 10.78.251.238	10.78.251.239
192	10.78.251.240/28	10.78.251.241 – 10.78.251.254	10.78.251.255
193	10.78.252.0/28	10.78.252.1 – 10.78.252.14	10.78.252.15
194	10.78.252.16/28	10.78.252.17 – 10.78.252.30	10.78.252.31
195	10.78.252.32/28	10.78.252.33 – 10.78.252.46	10.78.252.47
196	10.78.252.48/28	10.78.252.49 – 10.78.252.62	10.78.252.63
197	10.78.252.64/28	10.78.252.65 – 10.78.252.78	10.78.252.79
198	10.78.252.80/28	10.78.252.81 – 10.78.252.94	10.78.252.95
199	10.78.252.96/28	10.78.252.97 – 10.78.252.110	10.78.252.111
200	10.78.252.112/28	10.78.252.113 – 10.78.252.126	10.78.252.127
201	10.78.252.128/28	10.78.252.129 – 10.78.252.142	10.78.252.143
202	10.78.252.144/28	10.78.252.145 – 10.78.252.158	10.78.252.159
203	10.78.252.160/28	10.78.252.161 – 10.78.252.174	10.78.252.175
204	10.78.252.176/28	10.78.252.177 – 10.78.252.190	10.78.252.191
205	10.78.252.192/28	10.78.252.193 – 10.78.252.206	10.78.252.207
206	10.78.252.208/28	10.78.252.209 – 10.78.252.222	10.78.252.223
207	10.78.252.224/28	10.78.252.225 – 10.78.252.238	10.78.252.239
208	10.78.252.240/28	10.78.252.241 – 10.78.252.254	10.78.252.255
209	10.78.253.0/28	10.78.253.1 – 10.78.253.14	10.78.253.15
210	10.78.253.16/28	10.78.253.17 – 10.78.253.30	10.78.253.31
211	10.78.253.32/28	10.78.253.33 – 10.78.253.46	10.78.253.47
212	10.78.253.48/28	10.78.253.49 – 10.78.253.62	10.78.253.63
213	10.78.253.64/28	10.78.253.65 – 10.78.253.78	10.78.253.79
214	10.78.253.80/28	10.78.253.81 – 10.78.253.94	10.78.253.95
215	10.78.253.96/28	10.78.253.97 – 10.78.253.110	10.78.253.111
216	10.78.253.112/28	10.78.253.113 – 10.78.253.126	10.78.253.127
217	10.78.253.128/28	10.78.253.129 – 10.78.253.142	10.78.253.143
218	10.78.253.144/28	10.78.253.145 – 10.78.253.158	10.78.253.159
219	10.78.253.160/28	10.78.253.161 – 10.78.253.174	10.78.253.175
220	10.78.253.176/28	10.78.253.177 – 10.78.253.190	10.78.253.191
221	10.78.253.192/28	10.78.253.193 – 10.78.253.206	10.78.253.207
222	10.78.253.208/28	10.78.253.209 – 10.78.253.222	10.78.253.223
223	10.78.253.224/28	10.78.253.225 – 10.78.253.238	10.78.253.239
224	10.78.253.240/28	10.78.253.241 – 10.78.253.254	10.78.253.255
225	10.78.254.0/28	10.78.254.1 – 10.78.254.14	10.78.254.15
226	10.78.254.16/28	10.78.254.17 – 10.78.254.30	10.78.254.31
227	10.78.254.32/28	10.78.254.33 – 10.78.254.46	10.78.254.47
228	10.78.254.48/28	10.78.254.49 – 10.78.254.62	10.78.254.63
229	10.78.254.64/28	10.78.254.65 – 10.78.254.78	10.78.254.79
230	10.78.254.80/28	10.78.254.81 – 10.78.254.94	10.78.254.95
231	10.78.254.96/28	10.78.254.97 – 10.78.254.110	10.78.254.111
232	10.78.254.112/28	10.78.254.113 – 10.78.254.126	10.78.254.127
233	10.78.254.128/28	10.78.254.129 – 10.78.254.142	10.78.254.143
234	10.78.254.144/28	10.78.254.145 – 10.78.254.158	10.78.254.159
235	10.78.254.160/28	10.78.254.161 – 10.78.254.174	10.78.254.175
236	10.78.254.176/28	10.78.254.177 – 10.78.254.190	10.78.254.191
237	10.78.254.192/28	10.78.254.193 – 10.78.254.206	10.78.254.207
238	10.78.254.208/28	10.78.254.209 – 10.78.254.222	10.78.254.223
239	10.78.254.224/28	10.78.254.225 – 10.78.254.238	10.78.254.239
240	10.78.254.240/28	10.78.254.241 – 10.78.254.254	10.78.254.255
241	10.78.255.0/28	10.78.255.1 – 10.78.255.14	10.78.255.15
242	10.78.255.16/28	10.78.255.17 – 10.78.255.30	10.78.255.31
243	10.78.255.32/28	10.78.255.33 – 10.78.255.46	10.78.255.47
244	10.78.255.48/28	10.78.255.49 – 10.78.255.62	10.78.255.63
245	10.78.255.64/28	10.78.255.65 – 10.78.255.78	10.78.255.79
246	10.78.255.80/28	10.78.255.81 – 10.78.255.94	10.78.255.95
247	10.78.255.96/28	10.78.255.97 – 10.78.255.110	10.78.255.111
248	10.78.255.112/28	10.78.255.113 – 10.78.255.126	10.78.255.127
249	10.78.255.128/28	10.78.255.129 – 10.78.255.142	10.78.255.143
250	10.78.255.144/28	10.78.255.145 – 10.78.255.158	10.78.255.159
251	10.78.255.160/28	10.78.255.161 – 10.78.255.174	10.78.255.175
252	10.78.255.176/28	10.78.255.177 – 10.78.255.190	10.78.255.191
253	10.78.255.192/28	10.78.255.193 – 10.78.255.206	10.78.255.207
254	10.78.255.208/28	10.78.255.209 – 10.78.255.222	10.78.255.223
255	10.78.255.224/28	10.78.255.225 – 10.78.255.238	10.78.255.239
256	10.78.255.240/28	10.78.255.241 – 10.78.255.254	10.78.255.255

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 /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 →