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)10.78.176.0/20

network10.78.176.0/20

broadcast10.78.191.255

first host10.78.176.1

last host10.78.191.254

subnet mask255.255.240.0

wildcard0.0.15.255

addresses4,096

usable hosts4,094

classA

ipcalc 10.78.176.0/20

address00001010.01001110.10110000.00000000

subnet mask11111111.11111111.11110000.00000000

network00001010.01001110.10110000.00000000

broadcast00001010.01001110.10111111.11111111

green = network part, grey = host part

hex0x0a4eb000

decimal172929024

reverse dns0.176.78.10.in-addr.arpa

ipv4-mapped::ffff:a4e:b000

/20 split into /28 · 256 subnets

close ×

#	network	host range	broadcast
1	10.78.176.0/28	10.78.176.1 – 10.78.176.14	10.78.176.15
2	10.78.176.16/28	10.78.176.17 – 10.78.176.30	10.78.176.31
3	10.78.176.32/28	10.78.176.33 – 10.78.176.46	10.78.176.47
4	10.78.176.48/28	10.78.176.49 – 10.78.176.62	10.78.176.63
5	10.78.176.64/28	10.78.176.65 – 10.78.176.78	10.78.176.79
6	10.78.176.80/28	10.78.176.81 – 10.78.176.94	10.78.176.95
7	10.78.176.96/28	10.78.176.97 – 10.78.176.110	10.78.176.111
8	10.78.176.112/28	10.78.176.113 – 10.78.176.126	10.78.176.127
9	10.78.176.128/28	10.78.176.129 – 10.78.176.142	10.78.176.143
10	10.78.176.144/28	10.78.176.145 – 10.78.176.158	10.78.176.159
11	10.78.176.160/28	10.78.176.161 – 10.78.176.174	10.78.176.175
12	10.78.176.176/28	10.78.176.177 – 10.78.176.190	10.78.176.191
13	10.78.176.192/28	10.78.176.193 – 10.78.176.206	10.78.176.207
14	10.78.176.208/28	10.78.176.209 – 10.78.176.222	10.78.176.223
15	10.78.176.224/28	10.78.176.225 – 10.78.176.238	10.78.176.239
16	10.78.176.240/28	10.78.176.241 – 10.78.176.254	10.78.176.255
17	10.78.177.0/28	10.78.177.1 – 10.78.177.14	10.78.177.15
18	10.78.177.16/28	10.78.177.17 – 10.78.177.30	10.78.177.31
19	10.78.177.32/28	10.78.177.33 – 10.78.177.46	10.78.177.47
20	10.78.177.48/28	10.78.177.49 – 10.78.177.62	10.78.177.63
21	10.78.177.64/28	10.78.177.65 – 10.78.177.78	10.78.177.79
22	10.78.177.80/28	10.78.177.81 – 10.78.177.94	10.78.177.95
23	10.78.177.96/28	10.78.177.97 – 10.78.177.110	10.78.177.111
24	10.78.177.112/28	10.78.177.113 – 10.78.177.126	10.78.177.127
25	10.78.177.128/28	10.78.177.129 – 10.78.177.142	10.78.177.143
26	10.78.177.144/28	10.78.177.145 – 10.78.177.158	10.78.177.159
27	10.78.177.160/28	10.78.177.161 – 10.78.177.174	10.78.177.175
28	10.78.177.176/28	10.78.177.177 – 10.78.177.190	10.78.177.191
29	10.78.177.192/28	10.78.177.193 – 10.78.177.206	10.78.177.207
30	10.78.177.208/28	10.78.177.209 – 10.78.177.222	10.78.177.223
31	10.78.177.224/28	10.78.177.225 – 10.78.177.238	10.78.177.239
32	10.78.177.240/28	10.78.177.241 – 10.78.177.254	10.78.177.255
33	10.78.178.0/28	10.78.178.1 – 10.78.178.14	10.78.178.15
34	10.78.178.16/28	10.78.178.17 – 10.78.178.30	10.78.178.31
35	10.78.178.32/28	10.78.178.33 – 10.78.178.46	10.78.178.47
36	10.78.178.48/28	10.78.178.49 – 10.78.178.62	10.78.178.63
37	10.78.178.64/28	10.78.178.65 – 10.78.178.78	10.78.178.79
38	10.78.178.80/28	10.78.178.81 – 10.78.178.94	10.78.178.95
39	10.78.178.96/28	10.78.178.97 – 10.78.178.110	10.78.178.111
40	10.78.178.112/28	10.78.178.113 – 10.78.178.126	10.78.178.127
41	10.78.178.128/28	10.78.178.129 – 10.78.178.142	10.78.178.143
42	10.78.178.144/28	10.78.178.145 – 10.78.178.158	10.78.178.159
43	10.78.178.160/28	10.78.178.161 – 10.78.178.174	10.78.178.175
44	10.78.178.176/28	10.78.178.177 – 10.78.178.190	10.78.178.191
45	10.78.178.192/28	10.78.178.193 – 10.78.178.206	10.78.178.207
46	10.78.178.208/28	10.78.178.209 – 10.78.178.222	10.78.178.223
47	10.78.178.224/28	10.78.178.225 – 10.78.178.238	10.78.178.239
48	10.78.178.240/28	10.78.178.241 – 10.78.178.254	10.78.178.255
49	10.78.179.0/28	10.78.179.1 – 10.78.179.14	10.78.179.15
50	10.78.179.16/28	10.78.179.17 – 10.78.179.30	10.78.179.31
51	10.78.179.32/28	10.78.179.33 – 10.78.179.46	10.78.179.47
52	10.78.179.48/28	10.78.179.49 – 10.78.179.62	10.78.179.63
53	10.78.179.64/28	10.78.179.65 – 10.78.179.78	10.78.179.79
54	10.78.179.80/28	10.78.179.81 – 10.78.179.94	10.78.179.95
55	10.78.179.96/28	10.78.179.97 – 10.78.179.110	10.78.179.111
56	10.78.179.112/28	10.78.179.113 – 10.78.179.126	10.78.179.127
57	10.78.179.128/28	10.78.179.129 – 10.78.179.142	10.78.179.143
58	10.78.179.144/28	10.78.179.145 – 10.78.179.158	10.78.179.159
59	10.78.179.160/28	10.78.179.161 – 10.78.179.174	10.78.179.175
60	10.78.179.176/28	10.78.179.177 – 10.78.179.190	10.78.179.191
61	10.78.179.192/28	10.78.179.193 – 10.78.179.206	10.78.179.207
62	10.78.179.208/28	10.78.179.209 – 10.78.179.222	10.78.179.223
63	10.78.179.224/28	10.78.179.225 – 10.78.179.238	10.78.179.239
64	10.78.179.240/28	10.78.179.241 – 10.78.179.254	10.78.179.255
65	10.78.180.0/28	10.78.180.1 – 10.78.180.14	10.78.180.15
66	10.78.180.16/28	10.78.180.17 – 10.78.180.30	10.78.180.31
67	10.78.180.32/28	10.78.180.33 – 10.78.180.46	10.78.180.47
68	10.78.180.48/28	10.78.180.49 – 10.78.180.62	10.78.180.63
69	10.78.180.64/28	10.78.180.65 – 10.78.180.78	10.78.180.79
70	10.78.180.80/28	10.78.180.81 – 10.78.180.94	10.78.180.95
71	10.78.180.96/28	10.78.180.97 – 10.78.180.110	10.78.180.111
72	10.78.180.112/28	10.78.180.113 – 10.78.180.126	10.78.180.127
73	10.78.180.128/28	10.78.180.129 – 10.78.180.142	10.78.180.143
74	10.78.180.144/28	10.78.180.145 – 10.78.180.158	10.78.180.159
75	10.78.180.160/28	10.78.180.161 – 10.78.180.174	10.78.180.175
76	10.78.180.176/28	10.78.180.177 – 10.78.180.190	10.78.180.191
77	10.78.180.192/28	10.78.180.193 – 10.78.180.206	10.78.180.207
78	10.78.180.208/28	10.78.180.209 – 10.78.180.222	10.78.180.223
79	10.78.180.224/28	10.78.180.225 – 10.78.180.238	10.78.180.239
80	10.78.180.240/28	10.78.180.241 – 10.78.180.254	10.78.180.255
81	10.78.181.0/28	10.78.181.1 – 10.78.181.14	10.78.181.15
82	10.78.181.16/28	10.78.181.17 – 10.78.181.30	10.78.181.31
83	10.78.181.32/28	10.78.181.33 – 10.78.181.46	10.78.181.47
84	10.78.181.48/28	10.78.181.49 – 10.78.181.62	10.78.181.63
85	10.78.181.64/28	10.78.181.65 – 10.78.181.78	10.78.181.79
86	10.78.181.80/28	10.78.181.81 – 10.78.181.94	10.78.181.95
87	10.78.181.96/28	10.78.181.97 – 10.78.181.110	10.78.181.111
88	10.78.181.112/28	10.78.181.113 – 10.78.181.126	10.78.181.127
89	10.78.181.128/28	10.78.181.129 – 10.78.181.142	10.78.181.143
90	10.78.181.144/28	10.78.181.145 – 10.78.181.158	10.78.181.159
91	10.78.181.160/28	10.78.181.161 – 10.78.181.174	10.78.181.175
92	10.78.181.176/28	10.78.181.177 – 10.78.181.190	10.78.181.191
93	10.78.181.192/28	10.78.181.193 – 10.78.181.206	10.78.181.207
94	10.78.181.208/28	10.78.181.209 – 10.78.181.222	10.78.181.223
95	10.78.181.224/28	10.78.181.225 – 10.78.181.238	10.78.181.239
96	10.78.181.240/28	10.78.181.241 – 10.78.181.254	10.78.181.255
97	10.78.182.0/28	10.78.182.1 – 10.78.182.14	10.78.182.15
98	10.78.182.16/28	10.78.182.17 – 10.78.182.30	10.78.182.31
99	10.78.182.32/28	10.78.182.33 – 10.78.182.46	10.78.182.47
100	10.78.182.48/28	10.78.182.49 – 10.78.182.62	10.78.182.63
101	10.78.182.64/28	10.78.182.65 – 10.78.182.78	10.78.182.79
102	10.78.182.80/28	10.78.182.81 – 10.78.182.94	10.78.182.95
103	10.78.182.96/28	10.78.182.97 – 10.78.182.110	10.78.182.111
104	10.78.182.112/28	10.78.182.113 – 10.78.182.126	10.78.182.127
105	10.78.182.128/28	10.78.182.129 – 10.78.182.142	10.78.182.143
106	10.78.182.144/28	10.78.182.145 – 10.78.182.158	10.78.182.159
107	10.78.182.160/28	10.78.182.161 – 10.78.182.174	10.78.182.175
108	10.78.182.176/28	10.78.182.177 – 10.78.182.190	10.78.182.191
109	10.78.182.192/28	10.78.182.193 – 10.78.182.206	10.78.182.207
110	10.78.182.208/28	10.78.182.209 – 10.78.182.222	10.78.182.223
111	10.78.182.224/28	10.78.182.225 – 10.78.182.238	10.78.182.239
112	10.78.182.240/28	10.78.182.241 – 10.78.182.254	10.78.182.255
113	10.78.183.0/28	10.78.183.1 – 10.78.183.14	10.78.183.15
114	10.78.183.16/28	10.78.183.17 – 10.78.183.30	10.78.183.31
115	10.78.183.32/28	10.78.183.33 – 10.78.183.46	10.78.183.47
116	10.78.183.48/28	10.78.183.49 – 10.78.183.62	10.78.183.63
117	10.78.183.64/28	10.78.183.65 – 10.78.183.78	10.78.183.79
118	10.78.183.80/28	10.78.183.81 – 10.78.183.94	10.78.183.95
119	10.78.183.96/28	10.78.183.97 – 10.78.183.110	10.78.183.111
120	10.78.183.112/28	10.78.183.113 – 10.78.183.126	10.78.183.127
121	10.78.183.128/28	10.78.183.129 – 10.78.183.142	10.78.183.143
122	10.78.183.144/28	10.78.183.145 – 10.78.183.158	10.78.183.159
123	10.78.183.160/28	10.78.183.161 – 10.78.183.174	10.78.183.175
124	10.78.183.176/28	10.78.183.177 – 10.78.183.190	10.78.183.191
125	10.78.183.192/28	10.78.183.193 – 10.78.183.206	10.78.183.207
126	10.78.183.208/28	10.78.183.209 – 10.78.183.222	10.78.183.223
127	10.78.183.224/28	10.78.183.225 – 10.78.183.238	10.78.183.239
128	10.78.183.240/28	10.78.183.241 – 10.78.183.254	10.78.183.255
129	10.78.184.0/28	10.78.184.1 – 10.78.184.14	10.78.184.15
130	10.78.184.16/28	10.78.184.17 – 10.78.184.30	10.78.184.31
131	10.78.184.32/28	10.78.184.33 – 10.78.184.46	10.78.184.47
132	10.78.184.48/28	10.78.184.49 – 10.78.184.62	10.78.184.63
133	10.78.184.64/28	10.78.184.65 – 10.78.184.78	10.78.184.79
134	10.78.184.80/28	10.78.184.81 – 10.78.184.94	10.78.184.95
135	10.78.184.96/28	10.78.184.97 – 10.78.184.110	10.78.184.111
136	10.78.184.112/28	10.78.184.113 – 10.78.184.126	10.78.184.127
137	10.78.184.128/28	10.78.184.129 – 10.78.184.142	10.78.184.143
138	10.78.184.144/28	10.78.184.145 – 10.78.184.158	10.78.184.159
139	10.78.184.160/28	10.78.184.161 – 10.78.184.174	10.78.184.175
140	10.78.184.176/28	10.78.184.177 – 10.78.184.190	10.78.184.191
141	10.78.184.192/28	10.78.184.193 – 10.78.184.206	10.78.184.207
142	10.78.184.208/28	10.78.184.209 – 10.78.184.222	10.78.184.223
143	10.78.184.224/28	10.78.184.225 – 10.78.184.238	10.78.184.239
144	10.78.184.240/28	10.78.184.241 – 10.78.184.254	10.78.184.255
145	10.78.185.0/28	10.78.185.1 – 10.78.185.14	10.78.185.15
146	10.78.185.16/28	10.78.185.17 – 10.78.185.30	10.78.185.31
147	10.78.185.32/28	10.78.185.33 – 10.78.185.46	10.78.185.47
148	10.78.185.48/28	10.78.185.49 – 10.78.185.62	10.78.185.63
149	10.78.185.64/28	10.78.185.65 – 10.78.185.78	10.78.185.79
150	10.78.185.80/28	10.78.185.81 – 10.78.185.94	10.78.185.95
151	10.78.185.96/28	10.78.185.97 – 10.78.185.110	10.78.185.111
152	10.78.185.112/28	10.78.185.113 – 10.78.185.126	10.78.185.127
153	10.78.185.128/28	10.78.185.129 – 10.78.185.142	10.78.185.143
154	10.78.185.144/28	10.78.185.145 – 10.78.185.158	10.78.185.159
155	10.78.185.160/28	10.78.185.161 – 10.78.185.174	10.78.185.175
156	10.78.185.176/28	10.78.185.177 – 10.78.185.190	10.78.185.191
157	10.78.185.192/28	10.78.185.193 – 10.78.185.206	10.78.185.207
158	10.78.185.208/28	10.78.185.209 – 10.78.185.222	10.78.185.223
159	10.78.185.224/28	10.78.185.225 – 10.78.185.238	10.78.185.239
160	10.78.185.240/28	10.78.185.241 – 10.78.185.254	10.78.185.255
161	10.78.186.0/28	10.78.186.1 – 10.78.186.14	10.78.186.15
162	10.78.186.16/28	10.78.186.17 – 10.78.186.30	10.78.186.31
163	10.78.186.32/28	10.78.186.33 – 10.78.186.46	10.78.186.47
164	10.78.186.48/28	10.78.186.49 – 10.78.186.62	10.78.186.63
165	10.78.186.64/28	10.78.186.65 – 10.78.186.78	10.78.186.79
166	10.78.186.80/28	10.78.186.81 – 10.78.186.94	10.78.186.95
167	10.78.186.96/28	10.78.186.97 – 10.78.186.110	10.78.186.111
168	10.78.186.112/28	10.78.186.113 – 10.78.186.126	10.78.186.127
169	10.78.186.128/28	10.78.186.129 – 10.78.186.142	10.78.186.143
170	10.78.186.144/28	10.78.186.145 – 10.78.186.158	10.78.186.159
171	10.78.186.160/28	10.78.186.161 – 10.78.186.174	10.78.186.175
172	10.78.186.176/28	10.78.186.177 – 10.78.186.190	10.78.186.191
173	10.78.186.192/28	10.78.186.193 – 10.78.186.206	10.78.186.207
174	10.78.186.208/28	10.78.186.209 – 10.78.186.222	10.78.186.223
175	10.78.186.224/28	10.78.186.225 – 10.78.186.238	10.78.186.239
176	10.78.186.240/28	10.78.186.241 – 10.78.186.254	10.78.186.255
177	10.78.187.0/28	10.78.187.1 – 10.78.187.14	10.78.187.15
178	10.78.187.16/28	10.78.187.17 – 10.78.187.30	10.78.187.31
179	10.78.187.32/28	10.78.187.33 – 10.78.187.46	10.78.187.47
180	10.78.187.48/28	10.78.187.49 – 10.78.187.62	10.78.187.63
181	10.78.187.64/28	10.78.187.65 – 10.78.187.78	10.78.187.79
182	10.78.187.80/28	10.78.187.81 – 10.78.187.94	10.78.187.95
183	10.78.187.96/28	10.78.187.97 – 10.78.187.110	10.78.187.111
184	10.78.187.112/28	10.78.187.113 – 10.78.187.126	10.78.187.127
185	10.78.187.128/28	10.78.187.129 – 10.78.187.142	10.78.187.143
186	10.78.187.144/28	10.78.187.145 – 10.78.187.158	10.78.187.159
187	10.78.187.160/28	10.78.187.161 – 10.78.187.174	10.78.187.175
188	10.78.187.176/28	10.78.187.177 – 10.78.187.190	10.78.187.191
189	10.78.187.192/28	10.78.187.193 – 10.78.187.206	10.78.187.207
190	10.78.187.208/28	10.78.187.209 – 10.78.187.222	10.78.187.223
191	10.78.187.224/28	10.78.187.225 – 10.78.187.238	10.78.187.239
192	10.78.187.240/28	10.78.187.241 – 10.78.187.254	10.78.187.255
193	10.78.188.0/28	10.78.188.1 – 10.78.188.14	10.78.188.15
194	10.78.188.16/28	10.78.188.17 – 10.78.188.30	10.78.188.31
195	10.78.188.32/28	10.78.188.33 – 10.78.188.46	10.78.188.47
196	10.78.188.48/28	10.78.188.49 – 10.78.188.62	10.78.188.63
197	10.78.188.64/28	10.78.188.65 – 10.78.188.78	10.78.188.79
198	10.78.188.80/28	10.78.188.81 – 10.78.188.94	10.78.188.95
199	10.78.188.96/28	10.78.188.97 – 10.78.188.110	10.78.188.111
200	10.78.188.112/28	10.78.188.113 – 10.78.188.126	10.78.188.127
201	10.78.188.128/28	10.78.188.129 – 10.78.188.142	10.78.188.143
202	10.78.188.144/28	10.78.188.145 – 10.78.188.158	10.78.188.159
203	10.78.188.160/28	10.78.188.161 – 10.78.188.174	10.78.188.175
204	10.78.188.176/28	10.78.188.177 – 10.78.188.190	10.78.188.191
205	10.78.188.192/28	10.78.188.193 – 10.78.188.206	10.78.188.207
206	10.78.188.208/28	10.78.188.209 – 10.78.188.222	10.78.188.223
207	10.78.188.224/28	10.78.188.225 – 10.78.188.238	10.78.188.239
208	10.78.188.240/28	10.78.188.241 – 10.78.188.254	10.78.188.255
209	10.78.189.0/28	10.78.189.1 – 10.78.189.14	10.78.189.15
210	10.78.189.16/28	10.78.189.17 – 10.78.189.30	10.78.189.31
211	10.78.189.32/28	10.78.189.33 – 10.78.189.46	10.78.189.47
212	10.78.189.48/28	10.78.189.49 – 10.78.189.62	10.78.189.63
213	10.78.189.64/28	10.78.189.65 – 10.78.189.78	10.78.189.79
214	10.78.189.80/28	10.78.189.81 – 10.78.189.94	10.78.189.95
215	10.78.189.96/28	10.78.189.97 – 10.78.189.110	10.78.189.111
216	10.78.189.112/28	10.78.189.113 – 10.78.189.126	10.78.189.127
217	10.78.189.128/28	10.78.189.129 – 10.78.189.142	10.78.189.143
218	10.78.189.144/28	10.78.189.145 – 10.78.189.158	10.78.189.159
219	10.78.189.160/28	10.78.189.161 – 10.78.189.174	10.78.189.175
220	10.78.189.176/28	10.78.189.177 – 10.78.189.190	10.78.189.191
221	10.78.189.192/28	10.78.189.193 – 10.78.189.206	10.78.189.207
222	10.78.189.208/28	10.78.189.209 – 10.78.189.222	10.78.189.223
223	10.78.189.224/28	10.78.189.225 – 10.78.189.238	10.78.189.239
224	10.78.189.240/28	10.78.189.241 – 10.78.189.254	10.78.189.255
225	10.78.190.0/28	10.78.190.1 – 10.78.190.14	10.78.190.15
226	10.78.190.16/28	10.78.190.17 – 10.78.190.30	10.78.190.31
227	10.78.190.32/28	10.78.190.33 – 10.78.190.46	10.78.190.47
228	10.78.190.48/28	10.78.190.49 – 10.78.190.62	10.78.190.63
229	10.78.190.64/28	10.78.190.65 – 10.78.190.78	10.78.190.79
230	10.78.190.80/28	10.78.190.81 – 10.78.190.94	10.78.190.95
231	10.78.190.96/28	10.78.190.97 – 10.78.190.110	10.78.190.111
232	10.78.190.112/28	10.78.190.113 – 10.78.190.126	10.78.190.127
233	10.78.190.128/28	10.78.190.129 – 10.78.190.142	10.78.190.143
234	10.78.190.144/28	10.78.190.145 – 10.78.190.158	10.78.190.159
235	10.78.190.160/28	10.78.190.161 – 10.78.190.174	10.78.190.175
236	10.78.190.176/28	10.78.190.177 – 10.78.190.190	10.78.190.191
237	10.78.190.192/28	10.78.190.193 – 10.78.190.206	10.78.190.207
238	10.78.190.208/28	10.78.190.209 – 10.78.190.222	10.78.190.223
239	10.78.190.224/28	10.78.190.225 – 10.78.190.238	10.78.190.239
240	10.78.190.240/28	10.78.190.241 – 10.78.190.254	10.78.190.255
241	10.78.191.0/28	10.78.191.1 – 10.78.191.14	10.78.191.15
242	10.78.191.16/28	10.78.191.17 – 10.78.191.30	10.78.191.31
243	10.78.191.32/28	10.78.191.33 – 10.78.191.46	10.78.191.47
244	10.78.191.48/28	10.78.191.49 – 10.78.191.62	10.78.191.63
245	10.78.191.64/28	10.78.191.65 – 10.78.191.78	10.78.191.79
246	10.78.191.80/28	10.78.191.81 – 10.78.191.94	10.78.191.95
247	10.78.191.96/28	10.78.191.97 – 10.78.191.110	10.78.191.111
248	10.78.191.112/28	10.78.191.113 – 10.78.191.126	10.78.191.127
249	10.78.191.128/28	10.78.191.129 – 10.78.191.142	10.78.191.143
250	10.78.191.144/28	10.78.191.145 – 10.78.191.158	10.78.191.159
251	10.78.191.160/28	10.78.191.161 – 10.78.191.174	10.78.191.175
252	10.78.191.176/28	10.78.191.177 – 10.78.191.190	10.78.191.191
253	10.78.191.192/28	10.78.191.193 – 10.78.191.206	10.78.191.207
254	10.78.191.208/28	10.78.191.209 – 10.78.191.222	10.78.191.223
255	10.78.191.224/28	10.78.191.225 – 10.78.191.238	10.78.191.239
256	10.78.191.240/28	10.78.191.241 – 10.78.191.254	10.78.191.255

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 →